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gecko-dev/dom/base/nsFocusManager.cpp

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/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set ts=8 sts=2 et sw=2 tw=80: */
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
#include "mozilla/dom/TabParent.h"
#include "nsFocusManager.h"
#include "AccessibleCaretEventHub.h"
#include "nsIInterfaceRequestorUtils.h"
#include "nsGkAtoms.h"
#include "nsContentUtils.h"
#include "nsIDocument.h"
#include "nsIEditor.h"
#include "nsPIDOMWindow.h"
#include "nsIDOMChromeWindow.h"
#include "nsIDOMElement.h"
#include "nsIDOMDocument.h"
#include "nsIDOMRange.h"
#include "nsIHTMLDocument.h"
#include "nsIDocShell.h"
#include "nsIDocShellTreeOwner.h"
#include "nsIFormControl.h"
#include "nsLayoutUtils.h"
#include "nsIPresShell.h"
#include "nsFrameTraversal.h"
#include "nsIWebNavigation.h"
#include "nsCaret.h"
#include "nsIBaseWindow.h"
#include "nsIXULWindow.h"
#include "nsViewManager.h"
#include "nsFrameSelection.h"
#include "mozilla/dom/Selection.h"
#include "nsXULPopupManager.h"
#include "nsMenuPopupFrame.h"
#include "nsIScriptObjectPrincipal.h"
#include "nsIPrincipal.h"
#include "nsIObserverService.h"
#include "nsIObjectFrame.h"
#include "nsBindingManager.h"
#include "nsStyleCoord.h"
#include "TabChild.h"
#include "nsFrameLoader.h"
#include "nsNumberControlFrame.h"
#include "mozilla/ContentEvents.h"
#include "mozilla/dom/Element.h"
#include "mozilla/dom/HTMLInputElement.h"
#include "mozilla/EventDispatcher.h"
#include "mozilla/EventStateManager.h"
#include "mozilla/EventStates.h"
#include "mozilla/IMEStateManager.h"
#include "mozilla/LookAndFeel.h"
#include "mozilla/Preferences.h"
#include "mozilla/Services.h"
#include "mozilla/Unused.h"
#include <algorithm>
#ifdef MOZ_XUL
#include "nsIDOMXULTextboxElement.h"
#include "nsIDOMXULMenuListElement.h"
#endif
#ifdef ACCESSIBILITY
#include "nsAccessibilityService.h"
#endif
#ifndef XP_MACOSX
#include "nsIScriptError.h"
#endif
using namespace mozilla;
using namespace mozilla::dom;
using namespace mozilla::widget;
// Two types of focus pr logging are available:
// 'Focus' for normal focus manager calls
// 'FocusNavigation' for tab and document navigation
LazyLogModule gFocusLog("Focus");
LazyLogModule gFocusNavigationLog("FocusNavigation");
#define LOGFOCUS(args) MOZ_LOG(gFocusLog, mozilla::LogLevel::Debug, args)
#define LOGFOCUSNAVIGATION(args) MOZ_LOG(gFocusNavigationLog, mozilla::LogLevel::Debug, args)
#define LOGTAG(log, format, content) \
if (MOZ_LOG_TEST(log, LogLevel::Debug)) { \
nsAutoCString tag(NS_LITERAL_CSTRING("(none)")); \
if (content) { \
content->NodeInfo()->NameAtom()->ToUTF8String(tag); \
} \
MOZ_LOG(log, LogLevel::Debug, (format, tag.get())); \
}
#define LOGCONTENT(format, content) LOGTAG(gFocusLog, format, content)
#define LOGCONTENTNAVIGATION(format, content) LOGTAG(gFocusNavigationLog, format, content)
struct nsDelayedBlurOrFocusEvent
{
nsDelayedBlurOrFocusEvent(EventMessage aEventMessage,
nsIPresShell* aPresShell,
nsIDocument* aDocument,
EventTarget* aTarget,
EventTarget* aRelatedTarget)
: mPresShell(aPresShell)
, mDocument(aDocument)
, mTarget(aTarget)
, mEventMessage(aEventMessage)
, mRelatedTarget(aRelatedTarget)
{
}
nsDelayedBlurOrFocusEvent(const nsDelayedBlurOrFocusEvent& aOther)
: mPresShell(aOther.mPresShell)
, mDocument(aOther.mDocument)
, mTarget(aOther.mTarget)
, mEventMessage(aOther.mEventMessage)
{
}
nsCOMPtr<nsIPresShell> mPresShell;
nsCOMPtr<nsIDocument> mDocument;
nsCOMPtr<EventTarget> mTarget;
EventMessage mEventMessage;
nsCOMPtr<EventTarget> mRelatedTarget;
};
inline void ImplCycleCollectionUnlink(nsDelayedBlurOrFocusEvent& aField)
{
aField.mPresShell = nullptr;
aField.mDocument = nullptr;
aField.mTarget = nullptr;
aField.mRelatedTarget = nullptr;
}
inline void
ImplCycleCollectionTraverse(nsCycleCollectionTraversalCallback& aCallback,
nsDelayedBlurOrFocusEvent& aField,
const char* aName,
uint32_t aFlags = 0)
{
CycleCollectionNoteChild(aCallback, aField.mPresShell.get(), aName, aFlags);
CycleCollectionNoteChild(aCallback, aField.mDocument.get(), aName, aFlags);
CycleCollectionNoteChild(aCallback, aField.mTarget.get(), aName, aFlags);
CycleCollectionNoteChild(aCallback, aField.mRelatedTarget.get(), aName, aFlags);
}
NS_INTERFACE_MAP_BEGIN_CYCLE_COLLECTION(nsFocusManager)
NS_INTERFACE_MAP_ENTRY(nsIFocusManager)
NS_INTERFACE_MAP_ENTRY(nsIObserver)
NS_INTERFACE_MAP_ENTRY(nsISupportsWeakReference)
NS_INTERFACE_MAP_ENTRY_AMBIGUOUS(nsISupports, nsIFocusManager)
NS_INTERFACE_MAP_END
NS_IMPL_CYCLE_COLLECTING_ADDREF(nsFocusManager)
NS_IMPL_CYCLE_COLLECTING_RELEASE(nsFocusManager)
NS_IMPL_CYCLE_COLLECTION(nsFocusManager,
mActiveWindow,
mFocusedWindow,
mFocusedContent,
mFirstBlurEvent,
mFirstFocusEvent,
mWindowBeingLowered,
mDelayedBlurFocusEvents,
mMouseButtonEventHandlingDocument)
nsFocusManager* nsFocusManager::sInstance = nullptr;
bool nsFocusManager::sMouseFocusesFormControl = false;
bool nsFocusManager::sTestMode = false;
static const char* kObservedPrefs[] = {
"accessibility.browsewithcaret",
"accessibility.tabfocus_applies_to_xul",
"accessibility.mouse_focuses_formcontrol",
"focusmanager.testmode",
nullptr
};
nsFocusManager::nsFocusManager()
{ }
nsFocusManager::~nsFocusManager()
{
Preferences::RemoveObservers(this, kObservedPrefs);
nsCOMPtr<nsIObserverService> obs = mozilla::services::GetObserverService();
if (obs) {
obs->RemoveObserver(this, "xpcom-shutdown");
}
}
// static
nsresult
nsFocusManager::Init()
{
nsFocusManager* fm = new nsFocusManager();
NS_ADDREF(fm);
sInstance = fm;
nsIContent::sTabFocusModelAppliesToXUL =
Preferences::GetBool("accessibility.tabfocus_applies_to_xul",
nsIContent::sTabFocusModelAppliesToXUL);
sMouseFocusesFormControl =
Preferences::GetBool("accessibility.mouse_focuses_formcontrol", false);
sTestMode = Preferences::GetBool("focusmanager.testmode", false);
Preferences::AddWeakObservers(fm, kObservedPrefs);
nsCOMPtr<nsIObserverService> obs = mozilla::services::GetObserverService();
if (obs) {
obs->AddObserver(fm, "xpcom-shutdown", true);
}
return NS_OK;
}
// static
void
nsFocusManager::Shutdown()
{
NS_IF_RELEASE(sInstance);
}
NS_IMETHODIMP
nsFocusManager::Observe(nsISupports *aSubject,
const char *aTopic,
const char16_t *aData)
{
if (!nsCRT::strcmp(aTopic, NS_PREFBRANCH_PREFCHANGE_TOPIC_ID)) {
nsDependentString data(aData);
if (data.EqualsLiteral("accessibility.browsewithcaret")) {
UpdateCaretForCaretBrowsingMode();
}
else if (data.EqualsLiteral("accessibility.tabfocus_applies_to_xul")) {
nsIContent::sTabFocusModelAppliesToXUL =
Preferences::GetBool("accessibility.tabfocus_applies_to_xul",
nsIContent::sTabFocusModelAppliesToXUL);
}
else if (data.EqualsLiteral("accessibility.mouse_focuses_formcontrol")) {
sMouseFocusesFormControl =
Preferences::GetBool("accessibility.mouse_focuses_formcontrol",
false);
}
else if (data.EqualsLiteral("focusmanager.testmode")) {
sTestMode = Preferences::GetBool("focusmanager.testmode", false);
}
} else if (!nsCRT::strcmp(aTopic, "xpcom-shutdown")) {
mActiveWindow = nullptr;
mFocusedWindow = nullptr;
mFocusedContent = nullptr;
mFirstBlurEvent = nullptr;
mFirstFocusEvent = nullptr;
mWindowBeingLowered = nullptr;
mDelayedBlurFocusEvents.Clear();
mMouseButtonEventHandlingDocument = nullptr;
}
return NS_OK;
}
// given a frame content node, retrieve the nsIDOMWindow displayed in it
static nsPIDOMWindowOuter*
GetContentWindow(nsIContent* aContent)
{
nsIDocument* doc = aContent->GetComposedDoc();
if (doc) {
nsIDocument* subdoc = doc->GetSubDocumentFor(aContent);
if (subdoc)
return subdoc->GetWindow();
}
return nullptr;
}
// get the current window for the given content node
static nsPIDOMWindowOuter*
GetCurrentWindow(nsIContent* aContent)
{
nsIDocument* doc = aContent->GetComposedDoc();
return doc ? doc->GetWindow() : nullptr;
}
// static
nsIContent*
nsFocusManager::GetFocusedDescendant(nsPIDOMWindowOuter* aWindow, bool aDeep,
nsPIDOMWindowOuter** aFocusedWindow)
{
NS_ENSURE_TRUE(aWindow, nullptr);
*aFocusedWindow = nullptr;
nsIContent* currentContent = nullptr;
nsPIDOMWindowOuter* window = aWindow;
while (window) {
*aFocusedWindow = window;
currentContent = window->GetFocusedNode();
if (!currentContent || !aDeep)
break;
window = GetContentWindow(currentContent);
}
NS_IF_ADDREF(*aFocusedWindow);
return currentContent;
}
// static
nsIContent*
nsFocusManager::GetRedirectedFocus(nsIContent* aContent)
{
// For input number, redirect focus to our anonymous text control.
if (aContent->IsHTMLElement(nsGkAtoms::input)) {
bool typeIsNumber =
static_cast<dom::HTMLInputElement*>(aContent)->GetType() ==
NS_FORM_INPUT_NUMBER;
if (typeIsNumber) {
nsNumberControlFrame* numberControlFrame =
do_QueryFrame(aContent->GetPrimaryFrame());
if (numberControlFrame) {
HTMLInputElement* textControl =
numberControlFrame->GetAnonTextControl();
return static_cast<nsIContent*>(textControl);
}
}
}
#ifdef MOZ_XUL
if (aContent->IsXULElement()) {
nsCOMPtr<nsIDOMNode> inputField;
nsCOMPtr<nsIDOMXULTextBoxElement> textbox = do_QueryInterface(aContent);
if (textbox) {
textbox->GetInputField(getter_AddRefs(inputField));
}
else {
nsCOMPtr<nsIDOMXULMenuListElement> menulist = do_QueryInterface(aContent);
if (menulist) {
menulist->GetInputField(getter_AddRefs(inputField));
}
else if (aContent->IsXULElement(nsGkAtoms::scale)) {
nsCOMPtr<nsIDocument> doc = aContent->GetComposedDoc();
if (!doc)
return nullptr;
nsINodeList* children = doc->BindingManager()->GetAnonymousNodesFor(aContent);
if (children) {
nsIContent* child = children->Item(0);
if (child && child->IsXULElement(nsGkAtoms::slider))
return child;
}
}
}
if (inputField) {
nsCOMPtr<nsIContent> retval = do_QueryInterface(inputField);
return retval;
}
}
#endif
return nullptr;
}
// static
InputContextAction::Cause
nsFocusManager::GetFocusMoveActionCause(uint32_t aFlags)
{
if (aFlags & nsIFocusManager::FLAG_BYTOUCH) {
return InputContextAction::CAUSE_TOUCH;
} else if (aFlags & nsIFocusManager::FLAG_BYMOUSE) {
return InputContextAction::CAUSE_MOUSE;
} else if (aFlags & nsIFocusManager::FLAG_BYKEY) {
return InputContextAction::CAUSE_KEY;
}
return InputContextAction::CAUSE_UNKNOWN;
}
NS_IMETHODIMP
nsFocusManager::GetActiveWindow(mozIDOMWindowProxy** aWindow)
{
NS_IF_ADDREF(*aWindow = mActiveWindow);
return NS_OK;
}
NS_IMETHODIMP
nsFocusManager::SetActiveWindow(mozIDOMWindowProxy* aWindow)
{
NS_ENSURE_STATE(aWindow);
// only top-level windows can be made active
nsCOMPtr<nsPIDOMWindowOuter> piWindow = nsPIDOMWindowOuter::From(aWindow);
NS_ENSURE_TRUE(piWindow == piWindow->GetPrivateRoot(), NS_ERROR_INVALID_ARG);
RaiseWindow(piWindow);
return NS_OK;
}
NS_IMETHODIMP
nsFocusManager::GetFocusedWindow(mozIDOMWindowProxy** aFocusedWindow)
{
NS_IF_ADDREF(*aFocusedWindow = mFocusedWindow);
return NS_OK;
}
NS_IMETHODIMP nsFocusManager::SetFocusedWindow(mozIDOMWindowProxy* aWindowToFocus)
{
LOGFOCUS(("<<SetFocusedWindow begin>>"));
nsCOMPtr<nsPIDOMWindowOuter> windowToFocus = nsPIDOMWindowOuter::From(aWindowToFocus);
NS_ENSURE_TRUE(windowToFocus, NS_ERROR_FAILURE);
windowToFocus = windowToFocus->GetOuterWindow();
nsCOMPtr<Element> frameElement = windowToFocus->GetFrameElementInternal();
if (frameElement) {
// pass false for aFocusChanged so that the caret does not get updated
// and scrolling does not occur.
SetFocusInner(frameElement, 0, false, true);
}
else {
// this is a top-level window. If the window has a child frame focused,
// clear the focus. Otherwise, focus should already be in this frame, or
// already cleared. This ensures that focus will be in this frame and not
// in a child.
nsIContent* content = windowToFocus->GetFocusedNode();
if (content) {
if (nsCOMPtr<nsPIDOMWindowOuter> childWindow = GetContentWindow(content))
ClearFocus(windowToFocus);
}
}
nsCOMPtr<nsPIDOMWindowOuter> rootWindow = windowToFocus->GetPrivateRoot();
if (rootWindow)
RaiseWindow(rootWindow);
LOGFOCUS(("<<SetFocusedWindow end>>"));
return NS_OK;
}
NS_IMETHODIMP
nsFocusManager::GetFocusedElement(nsIDOMElement** aFocusedElement)
{
if (mFocusedContent)
CallQueryInterface(mFocusedContent, aFocusedElement);
else
*aFocusedElement = nullptr;
return NS_OK;
}
NS_IMETHODIMP
nsFocusManager::GetLastFocusMethod(mozIDOMWindowProxy* aWindow, uint32_t* aLastFocusMethod)
{
// the focus method is stored on the inner window
nsCOMPtr<nsPIDOMWindowOuter> window;
if (aWindow) {
window = nsPIDOMWindowOuter::From(aWindow);
}
if (!window)
window = mFocusedWindow;
*aLastFocusMethod = window ? window->GetFocusMethod() : 0;
NS_ASSERTION((*aLastFocusMethod & FOCUSMETHOD_MASK) == *aLastFocusMethod,
"invalid focus method");
return NS_OK;
}
NS_IMETHODIMP
nsFocusManager::SetFocus(nsIDOMElement* aElement, uint32_t aFlags)
{
LOGFOCUS(("<<SetFocus begin>>"));
nsCOMPtr<nsIContent> newFocus = do_QueryInterface(aElement);
NS_ENSURE_ARG(newFocus);
SetFocusInner(newFocus, aFlags, true, true);
LOGFOCUS(("<<SetFocus end>>"));
return NS_OK;
}
NS_IMETHODIMP
nsFocusManager::ElementIsFocusable(nsIDOMElement* aElement, uint32_t aFlags,
bool* aIsFocusable)
{
NS_ENSURE_TRUE(aElement, NS_ERROR_INVALID_ARG);
nsCOMPtr<nsIContent> aContent = do_QueryInterface(aElement);
*aIsFocusable = CheckIfFocusable(aContent, aFlags) != nullptr;
return NS_OK;
}
NS_IMETHODIMP
nsFocusManager::MoveFocus(mozIDOMWindowProxy* aWindow, nsIDOMElement* aStartElement,
uint32_t aType, uint32_t aFlags, nsIDOMElement** aElement)
{
*aElement = nullptr;
LOGFOCUS(("<<MoveFocus begin Type: %d Flags: %x>>", aType, aFlags));
if (MOZ_LOG_TEST(gFocusLog, LogLevel::Debug) && mFocusedWindow) {
nsIDocument* doc = mFocusedWindow->GetExtantDoc();
if (doc && doc->GetDocumentURI()) {
LOGFOCUS((" Focused Window: %p %s",
mFocusedWindow.get(),
doc->GetDocumentURI()->GetSpecOrDefault().get()));
}
}
LOGCONTENT(" Current Focus: %s", mFocusedContent.get());
// use FLAG_BYMOVEFOCUS when switching focus with MoveFocus unless one of
// the other focus methods is already set, or we're just moving to the root
// or caret position.
if (aType != MOVEFOCUS_ROOT && aType != MOVEFOCUS_CARET &&
(aFlags & FOCUSMETHOD_MASK) == 0) {
aFlags |= FLAG_BYMOVEFOCUS;
}
nsCOMPtr<nsPIDOMWindowOuter> window;
nsCOMPtr<nsIContent> startContent;
if (aStartElement) {
startContent = do_QueryInterface(aStartElement);
NS_ENSURE_TRUE(startContent, NS_ERROR_INVALID_ARG);
window = GetCurrentWindow(startContent);
}
else {
window = aWindow ? nsPIDOMWindowOuter::From(aWindow) : mFocusedWindow.get();
NS_ENSURE_TRUE(window, NS_ERROR_FAILURE);
}
NS_ENSURE_TRUE(window, NS_ERROR_FAILURE);
bool noParentTraversal = aFlags & FLAG_NOPARENTFRAME;
nsCOMPtr<nsIContent> newFocus;
nsresult rv = DetermineElementToMoveFocus(window, startContent, aType, noParentTraversal,
getter_AddRefs(newFocus));
if (rv == NS_SUCCESS_DOM_NO_OPERATION) {
return NS_OK;
}
NS_ENSURE_SUCCESS(rv, rv);
LOGCONTENTNAVIGATION("Element to be focused: %s", newFocus.get());
if (newFocus) {
// for caret movement, pass false for the aFocusChanged argument,
// otherwise the caret will end up moving to the focus position. This
// would be a problem because the caret would move to the beginning of the
// focused link making it impossible to navigate the caret over a link.
SetFocusInner(newFocus, aFlags, aType != MOVEFOCUS_CARET, true);
CallQueryInterface(newFocus, aElement);
}
else if (aType == MOVEFOCUS_ROOT || aType == MOVEFOCUS_CARET) {
// no content was found, so clear the focus for these two types.
ClearFocus(window);
}
LOGFOCUS(("<<MoveFocus end>>"));
return NS_OK;
}
NS_IMETHODIMP
nsFocusManager::ClearFocus(mozIDOMWindowProxy* aWindow)
{
LOGFOCUS(("<<ClearFocus begin>>"));
// if the window to clear is the focused window or an ancestor of the
// focused window, then blur the existing focused content. Otherwise, the
// focus is somewhere else so just update the current node.
NS_ENSURE_TRUE(aWindow, NS_ERROR_INVALID_ARG);
nsCOMPtr<nsPIDOMWindowOuter> window = nsPIDOMWindowOuter::From(aWindow);
if (IsSameOrAncestor(window, mFocusedWindow)) {
bool isAncestor = (window != mFocusedWindow);
if (Blur(window, nullptr, isAncestor, true)) {
// if we are clearing the focus on an ancestor of the focused window,
// the ancestor will become the new focused window, so focus it
if (isAncestor)
Focus(window, nullptr, 0, true, false, false, true);
}
}
else {
window->SetFocusedNode(nullptr);
}
LOGFOCUS(("<<ClearFocus end>>"));
return NS_OK;
}
NS_IMETHODIMP
nsFocusManager::GetFocusedElementForWindow(mozIDOMWindowProxy* aWindow,
bool aDeep,
mozIDOMWindowProxy** aFocusedWindow,
nsIDOMElement** aElement)
{
*aElement = nullptr;
if (aFocusedWindow)
*aFocusedWindow = nullptr;
NS_ENSURE_TRUE(aWindow, NS_ERROR_INVALID_ARG);
nsCOMPtr<nsPIDOMWindowOuter> window = nsPIDOMWindowOuter::From(aWindow);
nsCOMPtr<nsPIDOMWindowOuter> focusedWindow;
nsCOMPtr<nsIContent> focusedContent =
GetFocusedDescendant(window, aDeep, getter_AddRefs(focusedWindow));
if (focusedContent)
CallQueryInterface(focusedContent, aElement);
if (aFocusedWindow)
NS_IF_ADDREF(*aFocusedWindow = focusedWindow);
return NS_OK;
}
NS_IMETHODIMP
nsFocusManager::MoveCaretToFocus(mozIDOMWindowProxy* aWindow)
{
nsCOMPtr<nsIWebNavigation> webnav = do_GetInterface(aWindow);
nsCOMPtr<nsIDocShellTreeItem> dsti = do_QueryInterface(webnav);
if (dsti) {
if (dsti->ItemType() != nsIDocShellTreeItem::typeChrome) {
nsCOMPtr<nsIDocShell> docShell = do_QueryInterface(dsti);
NS_ENSURE_TRUE(docShell, NS_ERROR_FAILURE);
// don't move the caret for editable documents
bool isEditable;
docShell->GetEditable(&isEditable);
if (isEditable)
return NS_OK;
nsCOMPtr<nsIPresShell> presShell = docShell->GetPresShell();
NS_ENSURE_TRUE(presShell, NS_ERROR_FAILURE);
nsCOMPtr<nsPIDOMWindowOuter> window = nsPIDOMWindowOuter::From(aWindow);
nsCOMPtr<nsIContent> content = window->GetFocusedNode();
if (content)
MoveCaretToFocus(presShell, content);
}
}
return NS_OK;
}
NS_IMETHODIMP
nsFocusManager::WindowRaised(mozIDOMWindowProxy* aWindow)
{
NS_ENSURE_TRUE(aWindow, NS_ERROR_INVALID_ARG);
nsCOMPtr<nsPIDOMWindowOuter> window = nsPIDOMWindowOuter::From(aWindow);
if (MOZ_LOG_TEST(gFocusLog, LogLevel::Debug)) {
LOGFOCUS(("Window %p Raised [Currently: %p %p]", aWindow, mActiveWindow.get(), mFocusedWindow.get()));
nsIDocument* doc = window->GetExtantDoc();
if (doc && doc->GetDocumentURI()) {
LOGFOCUS((" Raised Window: %p %s", aWindow,
doc->GetDocumentURI()->GetSpecOrDefault().get()));
}
if (mActiveWindow) {
doc = mActiveWindow->GetExtantDoc();
if (doc && doc->GetDocumentURI()) {
LOGFOCUS((" Active Window: %p %s", mActiveWindow.get(),
doc->GetDocumentURI()->GetSpecOrDefault().get()));
}
}
}
if (mActiveWindow == window) {
// The window is already active, so there is no need to focus anything,
// but make sure that the right widget is focused. This is a special case
// for Windows because when restoring a minimized window, a second
// activation will occur and the top-level widget could be focused instead
// of the child we want. We solve this by calling SetFocus to ensure that
// what the focus manager thinks should be the current widget is actually
// focused.
EnsureCurrentWidgetFocused();
return NS_OK;
}
// lower the existing window, if any. This shouldn't happen usually.
if (mActiveWindow)
WindowLowered(mActiveWindow);
nsCOMPtr<nsIDocShellTreeItem> docShellAsItem = window->GetDocShell();
// If there's no docShellAsItem, this window must have been closed,
// in that case there is no tree owner.
NS_ENSURE_TRUE(docShellAsItem, NS_OK);
// set this as the active window
mActiveWindow = window;
// ensure that the window is enabled and visible
nsCOMPtr<nsIDocShellTreeOwner> treeOwner;
docShellAsItem->GetTreeOwner(getter_AddRefs(treeOwner));
nsCOMPtr<nsIBaseWindow> baseWindow = do_QueryInterface(treeOwner);
if (baseWindow) {
bool isEnabled = true;
if (NS_SUCCEEDED(baseWindow->GetEnabled(&isEnabled)) && !isEnabled) {
return NS_ERROR_FAILURE;
}
if (!sTestMode) {
baseWindow->SetVisibility(true);
}
}
// If this is a parent or single process window, send the activate event.
// Events for child process windows will be sent when ParentActivated
// is called.
if (XRE_IsParentProcess()) {
ActivateOrDeactivate(window, true);
}
// retrieve the last focused element within the window that was raised
nsCOMPtr<nsPIDOMWindowOuter> currentWindow;
nsCOMPtr<nsIContent> currentFocus =
GetFocusedDescendant(window, true, getter_AddRefs(currentWindow));
NS_ASSERTION(currentWindow, "window raised with no window current");
if (!currentWindow)
return NS_OK;
// If there is no nsIXULWindow, then this is an embedded or child process window.
// Pass false for aWindowRaised so that commands get updated.
nsCOMPtr<nsIXULWindow> xulWin(do_GetInterface(baseWindow));
Focus(currentWindow, currentFocus, 0, true, false, xulWin != nullptr, true);
return NS_OK;
}
NS_IMETHODIMP
nsFocusManager::WindowLowered(mozIDOMWindowProxy* aWindow)
{
NS_ENSURE_TRUE(aWindow, NS_ERROR_INVALID_ARG);
nsCOMPtr<nsPIDOMWindowOuter> window = nsPIDOMWindowOuter::From(aWindow);
if (MOZ_LOG_TEST(gFocusLog, LogLevel::Debug)) {
LOGFOCUS(("Window %p Lowered [Currently: %p %p]", aWindow, mActiveWindow.get(), mFocusedWindow.get()));
nsIDocument* doc = window->GetExtantDoc();
if (doc && doc->GetDocumentURI()) {
LOGFOCUS((" Lowered Window: %s",
doc->GetDocumentURI()->GetSpecOrDefault().get()));
}
if (mActiveWindow) {
doc = mActiveWindow->GetExtantDoc();
if (doc && doc->GetDocumentURI()) {
LOGFOCUS((" Active Window: %s",
doc->GetDocumentURI()->GetSpecOrDefault().get()));
}
}
}
if (mActiveWindow != window)
return NS_OK;
// clear the mouse capture as the active window has changed
nsIPresShell::SetCapturingContent(nullptr, 0);
// In addition, reset the drag state to ensure that we are no longer in
// drag-select mode.
if (mFocusedWindow) {
nsCOMPtr<nsIDocShell> docShell = mFocusedWindow->GetDocShell();
if (docShell) {
nsCOMPtr<nsIPresShell> presShell = docShell->GetPresShell();
if (presShell) {
RefPtr<nsFrameSelection> frameSelection = presShell->FrameSelection();
frameSelection->SetDragState(false);
}
}
}
// If this is a parent or single process window, send the deactivate event.
// Events for child process windows will be sent when ParentActivated
// is called.
if (XRE_IsParentProcess()) {
ActivateOrDeactivate(window, false);
}
// keep track of the window being lowered, so that attempts to raise the
// window can be prevented until we return. Otherwise, focus can get into
// an unusual state.
mWindowBeingLowered = mActiveWindow;
mActiveWindow = nullptr;
if (mFocusedWindow)
Blur(nullptr, nullptr, true, true);
mWindowBeingLowered = nullptr;
return NS_OK;
}
nsresult
nsFocusManager::ContentRemoved(nsIDocument* aDocument, nsIContent* aContent)
{
NS_ENSURE_ARG(aDocument);
NS_ENSURE_ARG(aContent);
nsPIDOMWindowOuter *window = aDocument->GetWindow();
if (!window)
return NS_OK;
// if the content is currently focused in the window, or is an ancestor
// of the currently focused element, reset the focus within that window.
nsIContent* content = window->GetFocusedNode();
if (content && nsContentUtils::ContentIsDescendantOf(content, aContent)) {
bool shouldShowFocusRing = window->ShouldShowFocusRing();
window->SetFocusedNode(nullptr);
// if this window is currently focused, clear the global focused
// element as well, but don't fire any events.
if (window == mFocusedWindow) {
mFocusedContent = nullptr;
} else {
// Check if the node that was focused is an iframe or similar by looking
// if it has a subdocument. This would indicate that this focused iframe
// and its descendants will be going away. We will need to move the
// focus somewhere else, so just clear the focus in the toplevel window
// so that no element is focused.
nsIDocument* subdoc = aDocument->GetSubDocumentFor(content);
if (subdoc) {
nsCOMPtr<nsIDocShell> docShell = subdoc->GetDocShell();
if (docShell) {
nsCOMPtr<nsPIDOMWindowOuter> childWindow = docShell->GetWindow();
if (childWindow && IsSameOrAncestor(childWindow, mFocusedWindow)) {
ClearFocus(mActiveWindow);
}
}
}
}
// Notify the editor in case we removed its ancestor limiter.
if (content->IsEditable()) {
nsCOMPtr<nsIDocShell> docShell = aDocument->GetDocShell();
if (docShell) {
nsCOMPtr<nsIEditor> editor;
docShell->GetEditor(getter_AddRefs(editor));
if (editor) {
nsCOMPtr<nsISelection> s;
editor->GetSelection(getter_AddRefs(s));
nsCOMPtr<nsISelectionPrivate> selection = do_QueryInterface(s);
if (selection) {
nsCOMPtr<nsIContent> limiter;
selection->GetAncestorLimiter(getter_AddRefs(limiter));
if (limiter == content) {
editor->FinalizeSelection();
}
}
}
}
}
NotifyFocusStateChange(content, shouldShowFocusRing, false);
}
return NS_OK;
}
NS_IMETHODIMP
nsFocusManager::WindowShown(mozIDOMWindowProxy* aWindow, bool aNeedsFocus)
{
NS_ENSURE_TRUE(aWindow, NS_ERROR_INVALID_ARG);
nsCOMPtr<nsPIDOMWindowOuter> window = nsPIDOMWindowOuter::From(aWindow);
if (MOZ_LOG_TEST(gFocusLog, LogLevel::Debug)) {
LOGFOCUS(("Window %p Shown [Currently: %p %p]", window.get(), mActiveWindow.get(), mFocusedWindow.get()));
nsIDocument* doc = window->GetExtantDoc();
if (doc && doc->GetDocumentURI()) {
LOGFOCUS(("Shown Window: %s",
doc->GetDocumentURI()->GetSpecOrDefault().get()));
}
if (mFocusedWindow) {
doc = mFocusedWindow->GetExtantDoc();
if (doc && doc->GetDocumentURI()) {
LOGFOCUS((" Focused Window: %s",
doc->GetDocumentURI()->GetSpecOrDefault().get()));
}
}
}
if (nsIDocShell* docShell = window->GetDocShell()) {
if (nsCOMPtr<nsITabChild> child = docShell->GetTabChild()) {
bool active = static_cast<TabChild*>(child.get())->ParentIsActive();
ActivateOrDeactivate(window, active);
}
}
if (mFocusedWindow != window)
return NS_OK;
if (aNeedsFocus) {
nsCOMPtr<nsPIDOMWindowOuter> currentWindow;
nsCOMPtr<nsIContent> currentFocus =
GetFocusedDescendant(window, true, getter_AddRefs(currentWindow));
if (currentWindow)
Focus(currentWindow, currentFocus, 0, true, false, false, true);
}
else {
// Sometimes, an element in a window can be focused before the window is
// visible, which would mean that the widget may not be properly focused.
// When the window becomes visible, make sure the right widget is focused.
EnsureCurrentWidgetFocused();
}
return NS_OK;
}
NS_IMETHODIMP
nsFocusManager::WindowHidden(mozIDOMWindowProxy* aWindow)
{
// if there is no window or it is not the same or an ancestor of the
// currently focused window, just return, as the current focus will not
// be affected.
NS_ENSURE_TRUE(aWindow, NS_ERROR_INVALID_ARG);
nsCOMPtr<nsPIDOMWindowOuter> window = nsPIDOMWindowOuter::From(aWindow);
if (MOZ_LOG_TEST(gFocusLog, LogLevel::Debug)) {
LOGFOCUS(("Window %p Hidden [Currently: %p %p]", window.get(), mActiveWindow.get(), mFocusedWindow.get()));
nsAutoCString spec;
nsIDocument* doc = window->GetExtantDoc();
if (doc && doc->GetDocumentURI()) {
LOGFOCUS((" Hide Window: %s",
doc->GetDocumentURI()->GetSpecOrDefault().get()));
}
if (mFocusedWindow) {
doc = mFocusedWindow->GetExtantDoc();
if (doc && doc->GetDocumentURI()) {
LOGFOCUS((" Focused Window: %s",
doc->GetDocumentURI()->GetSpecOrDefault().get()));
}
}
if (mActiveWindow) {
doc = mActiveWindow->GetExtantDoc();
if (doc && doc->GetDocumentURI()) {
LOGFOCUS((" Active Window: %s",
doc->GetDocumentURI()->GetSpecOrDefault().get()));
}
}
}
if (!IsSameOrAncestor(window, mFocusedWindow))
return NS_OK;
// at this point, we know that the window being hidden is either the focused
// window, or an ancestor of the focused window. Either way, the focus is no
// longer valid, so it needs to be updated.
nsCOMPtr<nsIContent> oldFocusedContent = mFocusedContent.forget();
nsCOMPtr<nsIDocShell> focusedDocShell = mFocusedWindow->GetDocShell();
nsCOMPtr<nsIPresShell> presShell = focusedDocShell->GetPresShell();
if (oldFocusedContent && oldFocusedContent->IsInComposedDoc()) {
NotifyFocusStateChange(oldFocusedContent,
mFocusedWindow->ShouldShowFocusRing(),
false);
window->UpdateCommands(NS_LITERAL_STRING("focus"), nullptr, 0);
if (presShell) {
SendFocusOrBlurEvent(eBlur, presShell,
oldFocusedContent->GetComposedDoc(),
oldFocusedContent, 1, false);
}
}
nsPresContext* focusedPresContext =
presShell ? presShell->GetPresContext() : nullptr;
IMEStateManager::OnChangeFocus(focusedPresContext, nullptr,
GetFocusMoveActionCause(0));
if (presShell) {
SetCaretVisible(presShell, false, nullptr);
}
// if the docshell being hidden is being destroyed, then we want to move
// focus somewhere else. Call ClearFocus on the toplevel window, which
// will have the effect of clearing the focus and moving the focused window
// to the toplevel window. But if the window isn't being destroyed, we are
// likely just loading a new document in it, so we want to maintain the
// focused window so that the new document gets properly focused.
nsCOMPtr<nsIDocShell> docShellBeingHidden = window->GetDocShell();
bool beingDestroyed = !docShellBeingHidden;
if (docShellBeingHidden) {
docShellBeingHidden->IsBeingDestroyed(&beingDestroyed);
}
if (beingDestroyed) {
// There is usually no need to do anything if a toplevel window is going
// away, as we assume that WindowLowered will be called. However, this may
// not happen if nsIAppStartup::eForceQuit is used to quit, and can cause
// a leak. So if the active window is being destroyed, call WindowLowered
// directly.
NS_ASSERTION(mFocusedWindow->IsOuterWindow(), "outer window expected");
if (mActiveWindow == mFocusedWindow || mActiveWindow == window)
WindowLowered(mActiveWindow);
else
ClearFocus(mActiveWindow);
return NS_OK;
}
// if the window being hidden is an ancestor of the focused window, adjust
// the focused window so that it points to the one being hidden. This
// ensures that the focused window isn't in a chain of frames that doesn't
// exist any more.
if (window != mFocusedWindow) {
nsCOMPtr<nsIDocShellTreeItem> dsti =
mFocusedWindow ? mFocusedWindow->GetDocShell() : nullptr;
if (dsti) {
nsCOMPtr<nsIDocShellTreeItem> parentDsti;
dsti->GetParent(getter_AddRefs(parentDsti));
if (parentDsti) {
if (nsCOMPtr<nsPIDOMWindowOuter> parentWindow = parentDsti->GetWindow())
parentWindow->SetFocusedNode(nullptr);
}
}
SetFocusedWindowInternal(window);
}
return NS_OK;
}
NS_IMETHODIMP
nsFocusManager::FireDelayedEvents(nsIDocument* aDocument)
{
NS_ENSURE_ARG(aDocument);
// fire any delayed focus and blur events in the same order that they were added
for (uint32_t i = 0; i < mDelayedBlurFocusEvents.Length(); i++) {
if (mDelayedBlurFocusEvents[i].mDocument == aDocument) {
if (!aDocument->GetInnerWindow() ||
!aDocument->GetInnerWindow()->IsCurrentInnerWindow()) {
// If the document was navigated away from or is defunct, don't bother
// firing events on it. Note the symmetry between this condition and
// the similar one in nsDocument.cpp:FireOrClearDelayedEvents.
mDelayedBlurFocusEvents.RemoveElementAt(i);
--i;
} else if (!aDocument->EventHandlingSuppressed()) {
EventMessage message = mDelayedBlurFocusEvents[i].mEventMessage;
nsCOMPtr<EventTarget> target = mDelayedBlurFocusEvents[i].mTarget;
nsCOMPtr<nsIPresShell> presShell = mDelayedBlurFocusEvents[i].mPresShell;
nsCOMPtr<EventTarget> relatedTarget = mDelayedBlurFocusEvents[i].mRelatedTarget;
mDelayedBlurFocusEvents.RemoveElementAt(i);
SendFocusOrBlurEvent(message, presShell, aDocument, target, 0,
false, false, relatedTarget);
--i;
}
}
}
return NS_OK;
}
NS_IMETHODIMP
nsFocusManager::FocusPlugin(nsIContent* aContent)
{
NS_ENSURE_ARG(aContent);
SetFocusInner(aContent, 0, true, false);
return NS_OK;
}
NS_IMETHODIMP
nsFocusManager::ParentActivated(mozIDOMWindowProxy* aWindow, bool aActive)
{
nsCOMPtr<nsPIDOMWindowOuter> window = nsPIDOMWindowOuter::From(aWindow);
NS_ENSURE_TRUE(window, NS_ERROR_INVALID_ARG);
ActivateOrDeactivate(window, aActive);
return NS_OK;
}
/* static */
void
nsFocusManager::NotifyFocusStateChange(nsIContent* aContent,
bool aWindowShouldShowFocusRing,
bool aGettingFocus)
{
if (!aContent->IsElement()) {
return;
}
EventStates eventState = NS_EVENT_STATE_FOCUS;
if (aWindowShouldShowFocusRing) {
eventState |= NS_EVENT_STATE_FOCUSRING;
}
if (aGettingFocus) {
aContent->AsElement()->AddStates(eventState);
} else {
aContent->AsElement()->RemoveStates(eventState);
}
for (Element* element = aContent->AsElement(); element;
element = element->GetParentElementCrossingShadowRoot()) {
if (aGettingFocus) {
element->AddStates(NS_EVENT_STATE_FOCUS_WITHIN);
} else {
element->RemoveStates(NS_EVENT_STATE_FOCUS_WITHIN);
}
}
}
// static
void
nsFocusManager::EnsureCurrentWidgetFocused()
{
if (!mFocusedWindow || sTestMode)
return;
// get the main child widget for the focused window and ensure that the
// platform knows that this widget is focused.
nsCOMPtr<nsIDocShell> docShell = mFocusedWindow->GetDocShell();
if (docShell) {
nsCOMPtr<nsIPresShell> presShell = docShell->GetPresShell();
if (presShell) {
nsViewManager* vm = presShell->GetViewManager();
if (vm) {
nsCOMPtr<nsIWidget> widget;
vm->GetRootWidget(getter_AddRefs(widget));
if (widget)
widget->SetFocus(false);
}
}
}
}
bool
ActivateOrDeactivateChild(TabParent* aParent, void* aArg)
{
bool active = static_cast<bool>(aArg);
Unused << aParent->SendParentActivated(active);
return false;
}
void
nsFocusManager::ActivateOrDeactivate(nsPIDOMWindowOuter* aWindow, bool aActive)
{
if (!aWindow) {
return;
}
// Inform the DOM window that it has activated or deactivated, so that
// the active attribute is updated on the window.
aWindow->ActivateOrDeactivate(aActive);
// Send the activate event.
if (aWindow->GetExtantDoc()) {
nsContentUtils::DispatchEventOnlyToChrome(aWindow->GetExtantDoc(),
aWindow->GetCurrentInnerWindow(),
aActive ?
NS_LITERAL_STRING("activate") :
NS_LITERAL_STRING("deactivate"),
true, true, nullptr);
}
// Look for any remote child frames, iterate over them and send the activation notification.
nsContentUtils::CallOnAllRemoteChildren(aWindow, ActivateOrDeactivateChild,
(void *)aActive);
}
void
nsFocusManager::SetFocusInner(nsIContent* aNewContent, int32_t aFlags,
bool aFocusChanged, bool aAdjustWidget)
{
// if the element is not focusable, just return and leave the focus as is
nsCOMPtr<nsIContent> contentToFocus = CheckIfFocusable(aNewContent, aFlags);
if (!contentToFocus)
return;
// check if the element to focus is a frame (iframe) containing a child
// document. Frames are never directly focused; instead focusing a frame
// means focus what is inside the frame. To do this, the descendant content
// within the frame is retrieved and that will be focused instead.
nsCOMPtr<nsPIDOMWindowOuter> newWindow;
nsCOMPtr<nsPIDOMWindowOuter> subWindow = GetContentWindow(contentToFocus);
if (subWindow) {
contentToFocus = GetFocusedDescendant(subWindow, true, getter_AddRefs(newWindow));
// since a window is being refocused, clear aFocusChanged so that the
// caret position isn't updated.
aFocusChanged = false;
}
// unless it was set above, retrieve the window for the element to focus
if (!newWindow)
newWindow = GetCurrentWindow(contentToFocus);
// if the element is already focused, just return. Note that this happens
// after the frame check above so that we compare the element that will be
// focused rather than the frame it is in.
if (!newWindow || (newWindow == mFocusedWindow && contentToFocus == mFocusedContent))
return;
// don't allow focus to be placed in docshells or descendants of docshells
// that are being destroyed. Also, ensure that the page hasn't been
// unloaded. The prevents content from being refocused during an unload event.
nsCOMPtr<nsIDocShell> newDocShell = newWindow->GetDocShell();
nsCOMPtr<nsIDocShell> docShell = newDocShell;
while (docShell) {
bool inUnload;
docShell->GetIsInUnload(&inUnload);
if (inUnload)
return;
bool beingDestroyed;
docShell->IsBeingDestroyed(&beingDestroyed);
if (beingDestroyed)
return;
nsCOMPtr<nsIDocShellTreeItem> parentDsti;
docShell->GetParent(getter_AddRefs(parentDsti));
docShell = do_QueryInterface(parentDsti);
}
// if the new element is in the same window as the currently focused element
bool isElementInFocusedWindow = (mFocusedWindow == newWindow);
if (!isElementInFocusedWindow && mFocusedWindow && newWindow &&
nsContentUtils::IsHandlingKeyBoardEvent()) {
nsCOMPtr<nsIScriptObjectPrincipal> focused =
do_QueryInterface(mFocusedWindow);
nsCOMPtr<nsIScriptObjectPrincipal> newFocus =
do_QueryInterface(newWindow);
nsIPrincipal* focusedPrincipal = focused->GetPrincipal();
nsIPrincipal* newPrincipal = newFocus->GetPrincipal();
if (!focusedPrincipal || !newPrincipal) {
return;
}
bool subsumes = false;
focusedPrincipal->Subsumes(newPrincipal, &subsumes);
if (!subsumes && !nsContentUtils::LegacyIsCallerChromeOrNativeCode()) {
NS_WARNING("Not allowed to focus the new window!");
return;
}
}
// to check if the new element is in the active window, compare the
// new root docshell for the new element with the active window's docshell.
bool isElementInActiveWindow = false;
nsCOMPtr<nsIDocShellTreeItem> dsti = newWindow->GetDocShell();
nsCOMPtr<nsPIDOMWindowOuter> newRootWindow;
if (dsti) {
nsCOMPtr<nsIDocShellTreeItem> root;
dsti->GetRootTreeItem(getter_AddRefs(root));
newRootWindow = root ? root->GetWindow() : nullptr;
isElementInActiveWindow = (mActiveWindow && newRootWindow == mActiveWindow);
}
// Exit fullscreen if we're focusing a windowed plugin on a non-MacOSX
// system. We don't control event dispatch to windowed plugins on non-MacOSX,
// so we can't display the "Press ESC to leave fullscreen mode" warning on
// key input if a windowed plugin is focused, so just exit fullscreen
// to guard against phishing.
#ifndef XP_MACOSX
if (contentToFocus &&
nsContentUtils::
GetRootDocument(contentToFocus->OwnerDoc())->GetFullscreenElement() &&
nsContentUtils::HasPluginWithUncontrolledEventDispatch(contentToFocus)) {
nsContentUtils::ReportToConsole(nsIScriptError::warningFlag,
NS_LITERAL_CSTRING("DOM"),
contentToFocus->OwnerDoc(),
nsContentUtils::eDOM_PROPERTIES,
"FocusedWindowedPluginWhileFullscreen");
nsIDocument::AsyncExitFullscreen(contentToFocus->OwnerDoc());
}
#endif
// if the FLAG_NOSWITCHFRAME flag is used, only allow the focus to be
// shifted away from the current element if the new shell to focus is
// the same or an ancestor shell of the currently focused shell.
bool allowFrameSwitch = !(aFlags & FLAG_NOSWITCHFRAME) ||
IsSameOrAncestor(newWindow, mFocusedWindow);
// if the element is in the active window, frame switching is allowed and
// the content is in a visible window, fire blur and focus events.
bool sendFocusEvent =
isElementInActiveWindow && allowFrameSwitch && IsWindowVisible(newWindow);
// When the following conditions are true:
// * an element has focus
// * isn't called by trusted event (i.e., called by untrusted event or by js)
// * the focus is moved to another document's element
// we need to check the permission.
if (sendFocusEvent && mFocusedContent && !nsContentUtils::LegacyIsCallerNativeCode() &&
mFocusedContent->OwnerDoc() != aNewContent->OwnerDoc()) {
// If the caller cannot access the current focused node, the caller should
// not be able to steal focus from it. E.g., When the current focused node
// is in chrome, any web contents should not be able to steal the focus.
nsCOMPtr<nsIDOMNode> domNode(do_QueryInterface(mFocusedContent));
sendFocusEvent = nsContentUtils::CanCallerAccess(domNode);
if (!sendFocusEvent && mMouseButtonEventHandlingDocument) {
// However, while mouse button event is handling, the handling document's
// script should be able to steal focus.
domNode = do_QueryInterface(mMouseButtonEventHandlingDocument);
sendFocusEvent = nsContentUtils::CanCallerAccess(domNode);
}
}
LOGCONTENT("Shift Focus: %s", contentToFocus.get());
LOGFOCUS((" Flags: %x Current Window: %p New Window: %p Current Element: %p",
aFlags, mFocusedWindow.get(), newWindow.get(), mFocusedContent.get()));
LOGFOCUS((" In Active Window: %d In Focused Window: %d SendFocus: %d",
isElementInActiveWindow, isElementInFocusedWindow, sendFocusEvent));
if (sendFocusEvent) {
nsCOMPtr<nsIContent> oldFocusedContent = mFocusedContent;
// return if blurring fails or the focus changes during the blur
if (mFocusedWindow) {
// if the focus is being moved to another element in the same document,
// or to a descendant, pass the existing window to Blur so that the
// current node in the existing window is cleared. If moving to a
// window elsewhere, we want to maintain the current node in the
// window but still blur it.
bool currentIsSameOrAncestor = IsSameOrAncestor(mFocusedWindow, newWindow);
// find the common ancestor of the currently focused window and the new
// window. The ancestor will need to have its currently focused node
// cleared once the document has been blurred. Otherwise, we'll be in a
// state where a document is blurred yet the chain of windows above it
// still points to that document.
// For instance, in the following frame tree:
// A
// B C
// D
// D is focused and we want to focus C. Once D has been blurred, we need
// to clear out the focus in A, otherwise A would still maintain that B
// was focused, and B that D was focused.
nsCOMPtr<nsPIDOMWindowOuter> commonAncestor;
if (!isElementInFocusedWindow)
commonAncestor = GetCommonAncestor(newWindow, mFocusedWindow);
if (!Blur(currentIsSameOrAncestor ? mFocusedWindow.get() : nullptr,
commonAncestor, !isElementInFocusedWindow, aAdjustWidget,
contentToFocus))
return;
}
Focus(newWindow, contentToFocus, aFlags, !isElementInFocusedWindow,
aFocusChanged, false, aAdjustWidget, oldFocusedContent);
}
else {
// otherwise, for inactive windows and when the caller cannot steal the
// focus, update the node in the window, and raise the window if desired.
if (allowFrameSwitch)
AdjustWindowFocus(newWindow, true);
// set the focus node and method as needed
uint32_t focusMethod = aFocusChanged ? aFlags & FOCUSMETHODANDRING_MASK :
newWindow->GetFocusMethod() | (aFlags & FLAG_SHOWRING);
newWindow->SetFocusedNode(contentToFocus, focusMethod);
if (aFocusChanged) {
nsCOMPtr<nsIDocShell> docShell = newWindow->GetDocShell();
nsCOMPtr<nsIPresShell> presShell = docShell->GetPresShell();
if (presShell && presShell->DidInitialize())
ScrollIntoView(presShell, contentToFocus, aFlags);
}
// update the commands even when inactive so that the attributes for that
// window are up to date.
if (allowFrameSwitch)
newWindow->UpdateCommands(NS_LITERAL_STRING("focus"), nullptr, 0);
if (aFlags & FLAG_RAISE)
RaiseWindow(newRootWindow);
}
}
bool
nsFocusManager::IsSameOrAncestor(nsPIDOMWindowOuter* aPossibleAncestor,
nsPIDOMWindowOuter* aWindow)
{
if (!aWindow || !aPossibleAncestor) {
return false;
}
nsCOMPtr<nsIDocShellTreeItem> ancestordsti = aPossibleAncestor->GetDocShell();
nsCOMPtr<nsIDocShellTreeItem> dsti = aWindow->GetDocShell();
while (dsti) {
if (dsti == ancestordsti)
return true;
nsCOMPtr<nsIDocShellTreeItem> parentDsti;
dsti->GetParent(getter_AddRefs(parentDsti));
dsti.swap(parentDsti);
}
return false;
}
already_AddRefed<nsPIDOMWindowOuter>
nsFocusManager::GetCommonAncestor(nsPIDOMWindowOuter* aWindow1,
nsPIDOMWindowOuter* aWindow2)
{
NS_ENSURE_TRUE(aWindow1 && aWindow2, nullptr);
nsCOMPtr<nsIDocShellTreeItem> dsti1 = aWindow1->GetDocShell();
NS_ENSURE_TRUE(dsti1, nullptr);
nsCOMPtr<nsIDocShellTreeItem> dsti2 = aWindow2->GetDocShell();
NS_ENSURE_TRUE(dsti2, nullptr);
AutoTArray<nsIDocShellTreeItem*, 30> parents1, parents2;
do {
parents1.AppendElement(dsti1);
nsCOMPtr<nsIDocShellTreeItem> parentDsti1;
dsti1->GetParent(getter_AddRefs(parentDsti1));
dsti1.swap(parentDsti1);
} while (dsti1);
do {
parents2.AppendElement(dsti2);
nsCOMPtr<nsIDocShellTreeItem> parentDsti2;
dsti2->GetParent(getter_AddRefs(parentDsti2));
dsti2.swap(parentDsti2);
} while (dsti2);
uint32_t pos1 = parents1.Length();
uint32_t pos2 = parents2.Length();
nsIDocShellTreeItem* parent = nullptr;
uint32_t len;
for (len = std::min(pos1, pos2); len > 0; --len) {
nsIDocShellTreeItem* child1 = parents1.ElementAt(--pos1);
nsIDocShellTreeItem* child2 = parents2.ElementAt(--pos2);
if (child1 != child2) {
break;
}
parent = child1;
}
nsCOMPtr<nsPIDOMWindowOuter> window = parent ? parent->GetWindow() : nullptr;
return window.forget();
}
void
nsFocusManager::AdjustWindowFocus(nsPIDOMWindowOuter* aWindow,
bool aCheckPermission)
{
bool isVisible = IsWindowVisible(aWindow);
nsCOMPtr<nsPIDOMWindowOuter> window(aWindow);
while (window) {
// get the containing <iframe> or equivalent element so that it can be
// focused below.
nsCOMPtr<Element> frameElement = window->GetFrameElementInternal();
nsCOMPtr<nsIDocShellTreeItem> dsti = window->GetDocShell();
if (!dsti)
return;
nsCOMPtr<nsIDocShellTreeItem> parentDsti;
dsti->GetParent(getter_AddRefs(parentDsti));
if (!parentDsti) {
return;
}
window = parentDsti->GetWindow();
if (window) {
// if the parent window is visible but aWindow was not, then we have
// likely moved up and out from a hidden tab to the browser window, or a
// similar such arrangement. Stop adjusting the current nodes.
if (IsWindowVisible(window) != isVisible)
break;
// When aCheckPermission is true, we should check whether the caller can
// access the window or not. If it cannot access, we should stop the
// adjusting.
if (aCheckPermission && !nsContentUtils::LegacyIsCallerNativeCode() &&
!nsContentUtils::CanCallerAccess(window->GetCurrentInnerWindow())) {
break;
}
window->SetFocusedNode(frameElement);
}
}
}
bool
nsFocusManager::IsWindowVisible(nsPIDOMWindowOuter* aWindow)
{
if (!aWindow || aWindow->IsFrozen())
return false;
// Check if the inner window is frozen as well. This can happen when a focus change
// occurs while restoring a previous page.
nsPIDOMWindowInner* innerWindow = aWindow->GetCurrentInnerWindow();
if (!innerWindow || innerWindow->IsFrozen())
return false;
nsCOMPtr<nsIDocShell> docShell = aWindow->GetDocShell();
nsCOMPtr<nsIBaseWindow> baseWin(do_QueryInterface(docShell));
if (!baseWin)
return false;
bool visible = false;
baseWin->GetVisibility(&visible);
return visible;
}
bool
nsFocusManager::IsNonFocusableRoot(nsIContent* aContent)
{
NS_PRECONDITION(aContent, "aContent must not be NULL");
NS_PRECONDITION(aContent->IsInComposedDoc(), "aContent must be in a document");
// If aContent is in designMode, the root element is not focusable.
// NOTE: in designMode, most elements are not focusable, just the document is
// focusable.
// Also, if aContent is not editable but it isn't in designMode, it's not
// focusable.
// And in userfocusignored context nothing is focusable.
nsIDocument* doc = aContent->GetComposedDoc();
NS_ASSERTION(doc, "aContent must have current document");
return aContent == doc->GetRootElement() &&
(doc->HasFlag(NODE_IS_EDITABLE) || !aContent->IsEditable() ||
nsContentUtils::IsUserFocusIgnored(aContent));
}
nsIContent*
nsFocusManager::CheckIfFocusable(nsIContent* aContent, uint32_t aFlags)
{
if (!aContent)
return nullptr;
// this is a special case for some XUL elements or input number, where an
// anonymous child is actually focusable and not the element itself.
nsIContent* redirectedFocus = GetRedirectedFocus(aContent);
if (redirectedFocus)
return CheckIfFocusable(redirectedFocus, aFlags);
nsCOMPtr<nsIDocument> doc = aContent->GetComposedDoc();
// can't focus elements that are not in documents
if (!doc) {
LOGCONTENT("Cannot focus %s because content not in document", aContent)
return nullptr;
}
// Make sure that our frames are up to date
doc->FlushPendingNotifications(Flush_Layout);
nsIPresShell *shell = doc->GetShell();
if (!shell)
return nullptr;
// the root content can always be focused,
// except in userfocusignored context.
if (aContent == doc->GetRootElement())
return nsContentUtils::IsUserFocusIgnored(aContent) ? nullptr : aContent;
// cannot focus content in print preview mode. Only the root can be focused.
nsPresContext* presContext = shell->GetPresContext();
if (presContext && presContext->Type() == nsPresContext::eContext_PrintPreview) {
LOGCONTENT("Cannot focus %s while in print preview", aContent)
return nullptr;
}
nsIFrame* frame = aContent->GetPrimaryFrame();
if (!frame) {
LOGCONTENT("Cannot focus %s as it has no frame", aContent)
return nullptr;
}
if (aContent->IsHTMLElement(nsGkAtoms::area)) {
// HTML areas do not have their own frame, and the img frame we get from
// GetPrimaryFrame() is not relevant as to whether it is focusable or
// not, so we have to do all the relevant checks manually for them.
return frame->IsVisibleConsideringAncestors() &&
aContent->IsFocusable() ? aContent : nullptr;
}
// if this is a child frame content node, check if it is visible and
// call the content node's IsFocusable method instead of the frame's
// IsFocusable method. This skips checking the style system and ensures that
// offscreen browsers can still be focused.
nsIDocument* subdoc = doc->GetSubDocumentFor(aContent);
if (subdoc && IsWindowVisible(subdoc->GetWindow())) {
const nsStyleUserInterface* ui = frame->StyleUserInterface();
int32_t tabIndex = (ui->mUserFocus == StyleUserFocus::Ignore ||
ui->mUserFocus == StyleUserFocus::None) ? -1 : 0;
return aContent->IsFocusable(&tabIndex, aFlags & FLAG_BYMOUSE) ? aContent : nullptr;
}
return frame->IsFocusable(nullptr, aFlags & FLAG_BYMOUSE) ? aContent : nullptr;
}
bool
nsFocusManager::Blur(nsPIDOMWindowOuter* aWindowToClear,
nsPIDOMWindowOuter* aAncestorWindowToFocus,
bool aIsLeavingDocument,
bool aAdjustWidgets,
nsIContent* aContentToFocus)
{
LOGFOCUS(("<<Blur begin>>"));
// hold a reference to the focused content, which may be null
nsCOMPtr<nsIContent> content = mFocusedContent;
if (content) {
if (!content->IsInComposedDoc()) {
mFocusedContent = nullptr;
return true;
}
if (content == mFirstBlurEvent)
return true;
}
// hold a reference to the focused window
nsCOMPtr<nsPIDOMWindowOuter> window = mFocusedWindow;
if (!window) {
mFocusedContent = nullptr;
return true;
}
nsCOMPtr<nsIDocShell> docShell = window->GetDocShell();
if (!docShell) {
mFocusedContent = nullptr;
return true;
}
// Keep a ref to presShell since dispatching the DOM event may cause
// the document to be destroyed.
nsCOMPtr<nsIPresShell> presShell = docShell->GetPresShell();
if (!presShell) {
mFocusedContent = nullptr;
return true;
}
bool clearFirstBlurEvent = false;
if (!mFirstBlurEvent) {
mFirstBlurEvent = content;
clearFirstBlurEvent = true;
}
nsPresContext* focusedPresContext =
mActiveWindow ? presShell->GetPresContext() : nullptr;
IMEStateManager::OnChangeFocus(focusedPresContext, nullptr,
GetFocusMoveActionCause(0));
// now adjust the actual focus, by clearing the fields in the focus manager
// and in the window.
mFocusedContent = nullptr;
bool shouldShowFocusRing = window->ShouldShowFocusRing();
if (aWindowToClear)
aWindowToClear->SetFocusedNode(nullptr);
LOGCONTENT("Element %s has been blurred", content.get());
// Don't fire blur event on the root content which isn't editable.
bool sendBlurEvent =
content && content->IsInComposedDoc() && !IsNonFocusableRoot(content);
if (content) {
if (sendBlurEvent) {
NotifyFocusStateChange(content, shouldShowFocusRing, false);
}
// if an object/plug-in/remote browser is being blurred, move the system focus
// to the parent window, otherwise events will still get fired at the plugin.
// But don't do this if we are blurring due to the window being lowered,
// otherwise, the parent window can get raised again.
if (mActiveWindow) {
nsIFrame* contentFrame = content->GetPrimaryFrame();
nsIObjectFrame* objectFrame = do_QueryFrame(contentFrame);
if (aAdjustWidgets && objectFrame && !sTestMode) {
if (XRE_IsContentProcess()) {
// set focus to the top level window via the chrome process.
nsCOMPtr<nsITabChild> tabChild = docShell->GetTabChild();
if (tabChild) {
static_cast<TabChild*>(tabChild.get())->SendDispatchFocusToTopLevelWindow();
}
} else {
// note that the presshell's widget is being retrieved here, not the one
// for the object frame.
nsViewManager* vm = presShell->GetViewManager();
if (vm) {
nsCOMPtr<nsIWidget> widget;
vm->GetRootWidget(getter_AddRefs(widget));
if (widget) {
// set focus to the top level window but don't raise it.
widget->SetFocus(false);
}
}
}
}
}
// if the object being blurred is a remote browser, deactivate remote content
if (TabParent* remote = TabParent::GetFrom(content)) {
remote->Deactivate();
LOGFOCUS(("Remote browser deactivated"));
}
}
bool result = true;
if (sendBlurEvent) {
// if there is an active window, update commands. If there isn't an active
// window, then this was a blur caused by the active window being lowered,
// so there is no need to update the commands
if (mActiveWindow)
window->UpdateCommands(NS_LITERAL_STRING("focus"), nullptr, 0);
SendFocusOrBlurEvent(eBlur, presShell,
content->GetComposedDoc(), content, 1,
false, false, aContentToFocus);
}
// if we are leaving the document or the window was lowered, make the caret
// invisible.
if (aIsLeavingDocument || !mActiveWindow) {
SetCaretVisible(presShell, false, nullptr);
}
RefPtr<AccessibleCaretEventHub> eventHub = presShell->GetAccessibleCaretEventHub();
if (eventHub) {
eventHub->NotifyBlur(aIsLeavingDocument || !mActiveWindow);
}
// at this point, it is expected that this window will be still be
// focused, but the focused content will be null, as it was cleared before
// the event. If this isn't the case, then something else was focused during
// the blur event above and we should just return. However, if
// aIsLeavingDocument is set, a new document is desired, so make sure to
// blur the document and window.
if (mFocusedWindow != window ||
(mFocusedContent != nullptr && !aIsLeavingDocument)) {
result = false;
}
else if (aIsLeavingDocument) {
window->TakeFocus(false, 0);
// clear the focus so that the ancestor frame hierarchy is in the correct
// state. Pass true because aAncestorWindowToFocus is thought to be
// focused at this point.
if (aAncestorWindowToFocus)
aAncestorWindowToFocus->SetFocusedNode(nullptr, 0, true);
SetFocusedWindowInternal(nullptr);
mFocusedContent = nullptr;
// pass 1 for the focus method when calling SendFocusOrBlurEvent just so
// that the check is made for suppressed documents. Check to ensure that
// the document isn't null in case someone closed it during the blur above
nsIDocument* doc = window->GetExtantDoc();
if (doc)
SendFocusOrBlurEvent(eBlur, presShell, doc, doc, 1, false);
if (mFocusedWindow == nullptr)
SendFocusOrBlurEvent(eBlur, presShell, doc,
window->GetCurrentInnerWindow(), 1, false);
// check if a different window was focused
result = (mFocusedWindow == nullptr && mActiveWindow);
}
else if (mActiveWindow) {
// Otherwise, the blur of the element without blurring the document
// occurred normally. Call UpdateCaret to redisplay the caret at the right
// location within the document. This is needed to ensure that the caret
// used for caret browsing is made visible again when an input field is
// blurred.
UpdateCaret(false, true, nullptr);
}
if (clearFirstBlurEvent)
mFirstBlurEvent = nullptr;
return result;
}
void
nsFocusManager::Focus(nsPIDOMWindowOuter* aWindow,
nsIContent* aContent,
uint32_t aFlags,
bool aIsNewDocument,
bool aFocusChanged,
bool aWindowRaised,
bool aAdjustWidgets,
nsIContent* aContentLostFocus)
{
LOGFOCUS(("<<Focus begin>>"));
if (!aWindow)
return;
if (aContent && (aContent == mFirstFocusEvent || aContent == mFirstBlurEvent))
return;
// Keep a reference to the presShell since dispatching the DOM event may
// cause the document to be destroyed.
nsCOMPtr<nsIDocShell> docShell = aWindow->GetDocShell();
if (!docShell)
return;
nsCOMPtr<nsIPresShell> presShell = docShell->GetPresShell();
if (!presShell)
return;
// If the focus actually changed, set the focus method (mouse, keyboard, etc).
// Otherwise, just get the current focus method and use that. This ensures
// that the method is set during the document and window focus events.
uint32_t focusMethod = aFocusChanged ? aFlags & FOCUSMETHODANDRING_MASK :
aWindow->GetFocusMethod() | (aFlags & FLAG_SHOWRING);
if (!IsWindowVisible(aWindow)) {
// if the window isn't visible, for instance because it is a hidden tab,
// update the current focus and scroll it into view but don't do anything else
if (CheckIfFocusable(aContent, aFlags)) {
aWindow->SetFocusedNode(aContent, focusMethod);
if (aFocusChanged)
ScrollIntoView(presShell, aContent, aFlags);
}
return;
}
bool clearFirstFocusEvent = false;
if (!mFirstFocusEvent) {
mFirstFocusEvent = aContent;
clearFirstFocusEvent = true;
}
LOGCONTENT("Element %s has been focused", aContent);
if (MOZ_LOG_TEST(gFocusLog, LogLevel::Debug)) {
nsIDocument* docm = aWindow->GetExtantDoc();
if (docm) {
LOGCONTENT(" from %s", docm->GetRootElement());
}
LOGFOCUS((" [Newdoc: %d FocusChanged: %d Raised: %d Flags: %x]",
aIsNewDocument, aFocusChanged, aWindowRaised, aFlags));
}
if (aIsNewDocument) {
// if this is a new document, update the parent chain of frames so that
// focus can be traversed from the top level down to the newly focused
// window.
AdjustWindowFocus(aWindow, false);
}
// indicate that the window has taken focus.
if (aWindow->TakeFocus(true, focusMethod))
aIsNewDocument = true;
SetFocusedWindowInternal(aWindow);
// Update the system focus by focusing the root widget. But avoid this
// if 1) aAdjustWidgets is false or 2) aContent is a plugin that has its
// own widget and is either already focused or is about to be focused.
nsCOMPtr<nsIWidget> objectFrameWidget;
if (aContent) {
nsIFrame* contentFrame = aContent->GetPrimaryFrame();
nsIObjectFrame* objectFrame = do_QueryFrame(contentFrame);
if (objectFrame)
objectFrameWidget = objectFrame->GetWidget();
}
if (aAdjustWidgets && !objectFrameWidget && !sTestMode) {
nsViewManager* vm = presShell->GetViewManager();
if (vm) {
nsCOMPtr<nsIWidget> widget;
vm->GetRootWidget(getter_AddRefs(widget));
if (widget)
widget->SetFocus(false);
}
}
// if switching to a new document, first fire the focus event on the
// document and then the window.
if (aIsNewDocument) {
nsIDocument* doc = aWindow->GetExtantDoc();
// The focus change should be notified to IMEStateManager from here if
// the focused content is a designMode editor since any content won't
// receive focus event.
if (doc && doc->HasFlag(NODE_IS_EDITABLE)) {
IMEStateManager::OnChangeFocus(presShell->GetPresContext(), nullptr,
GetFocusMoveActionCause(aFlags));
}
if (doc)
SendFocusOrBlurEvent(eFocus, presShell, doc,
doc, aFlags & FOCUSMETHOD_MASK, aWindowRaised);
if (mFocusedWindow == aWindow && mFocusedContent == nullptr)
SendFocusOrBlurEvent(eFocus, presShell, doc,
aWindow->GetCurrentInnerWindow(),
aFlags & FOCUSMETHOD_MASK, aWindowRaised);
}
// check to ensure that the element is still focusable, and that nothing
// else was focused during the events above.
if (CheckIfFocusable(aContent, aFlags) &&
mFocusedWindow == aWindow && mFocusedContent == nullptr) {
mFocusedContent = aContent;
nsIContent* focusedNode = aWindow->GetFocusedNode();
bool isRefocus = focusedNode && focusedNode->IsEqualNode(aContent);
aWindow->SetFocusedNode(aContent, focusMethod);
bool sendFocusEvent =
aContent && aContent->IsInComposedDoc() && !IsNonFocusableRoot(aContent);
nsPresContext* presContext = presShell->GetPresContext();
if (sendFocusEvent) {
// if the focused element changed, scroll it into view
if (aFocusChanged)
ScrollIntoView(presShell, aContent, aFlags);
NotifyFocusStateChange(aContent, aWindow->ShouldShowFocusRing(), true);
// if this is an object/plug-in/remote browser, focus its widget. Note that we might
// no longer be in the same document, due to the events we fired above when
// aIsNewDocument.
if (presShell->GetDocument() == aContent->GetComposedDoc()) {
if (aAdjustWidgets && objectFrameWidget && !sTestMode)
objectFrameWidget->SetFocus(false);
// if the object being focused is a remote browser, activate remote content
if (TabParent* remote = TabParent::GetFrom(aContent)) {
remote->Activate();
LOGFOCUS(("Remote browser activated"));
}
}
IMEStateManager::OnChangeFocus(presContext, aContent,
GetFocusMoveActionCause(aFlags));
// as long as this focus wasn't because a window was raised, update the
// commands
// XXXndeakin P2 someone could adjust the focus during the update
if (!aWindowRaised)
aWindow->UpdateCommands(NS_LITERAL_STRING("focus"), nullptr, 0);
SendFocusOrBlurEvent(eFocus, presShell,
aContent->GetComposedDoc(),
aContent, aFlags & FOCUSMETHOD_MASK,
aWindowRaised, isRefocus, aContentLostFocus);
} else {
IMEStateManager::OnChangeFocus(presContext, nullptr,
GetFocusMoveActionCause(aFlags));
if (!aWindowRaised) {
aWindow->UpdateCommands(NS_LITERAL_STRING("focus"), nullptr, 0);
}
}
}
else {
// If the window focus event (fired above when aIsNewDocument) caused
// the plugin not to be focusable, update the system focus by focusing
// the root widget.
if (aAdjustWidgets && objectFrameWidget &&
mFocusedWindow == aWindow && mFocusedContent == nullptr &&
!sTestMode) {
nsViewManager* vm = presShell->GetViewManager();
if (vm) {
nsCOMPtr<nsIWidget> widget;
vm->GetRootWidget(getter_AddRefs(widget));
if (widget)
widget->SetFocus(false);
}
}
if (!mFocusedContent) {
// When there is no focused content, IMEStateManager needs to adjust IME
// enabled state with the document.
nsPresContext* presContext = presShell->GetPresContext();
IMEStateManager::OnChangeFocus(presContext, nullptr,
GetFocusMoveActionCause(aFlags));
}
if (!aWindowRaised)
aWindow->UpdateCommands(NS_LITERAL_STRING("focus"), nullptr, 0);
}
// update the caret visibility and position to match the newly focused
// element. However, don't update the position if this was a focus due to a
// mouse click as the selection code would already have moved the caret as
// needed. If this is a different document than was focused before, also
// update the caret's visibility. If this is the same document, the caret
// visibility should be the same as before so there is no need to update it.
if (mFocusedContent == aContent)
UpdateCaret(aFocusChanged && !(aFlags & FLAG_BYMOUSE), aIsNewDocument,
mFocusedContent);
if (clearFirstFocusEvent)
mFirstFocusEvent = nullptr;
}
class FocusBlurEvent : public Runnable
{
public:
FocusBlurEvent(nsISupports* aTarget, EventMessage aEventMessage,
nsPresContext* aContext, bool aWindowRaised,
bool aIsRefocus, EventTarget* aRelatedTarget)
: mTarget(aTarget)
, mContext(aContext)
, mEventMessage(aEventMessage)
, mWindowRaised(aWindowRaised)
, mIsRefocus(aIsRefocus)
, mRelatedTarget(aRelatedTarget)
{
}
NS_IMETHOD Run() override
{
InternalFocusEvent event(true, mEventMessage);
event.mFlags.mBubbles = false;
event.mFlags.mCancelable = false;
event.mFromRaise = mWindowRaised;
event.mIsRefocus = mIsRefocus;
event.mRelatedTarget = mRelatedTarget;
return EventDispatcher::Dispatch(mTarget, mContext, &event);
}
nsCOMPtr<nsISupports> mTarget;
RefPtr<nsPresContext> mContext;
EventMessage mEventMessage;
bool mWindowRaised;
bool mIsRefocus;
nsCOMPtr<EventTarget> mRelatedTarget;
};
class FocusInOutEvent : public Runnable
{
public:
FocusInOutEvent(nsISupports* aTarget, EventMessage aEventMessage,
nsPresContext* aContext,
nsPIDOMWindowOuter* aOriginalFocusedWindow,
nsIContent* aOriginalFocusedContent,
EventTarget* aRelatedTarget)
: mTarget(aTarget)
, mContext(aContext)
, mEventMessage(aEventMessage)
, mOriginalFocusedWindow(aOriginalFocusedWindow)
, mOriginalFocusedContent(aOriginalFocusedContent)
, mRelatedTarget(aRelatedTarget)
{
}
NS_IMETHOD Run() override
{
nsCOMPtr<nsIContent> originalWindowFocus = mOriginalFocusedWindow ?
mOriginalFocusedWindow->GetFocusedNode() :
nullptr;
// Blink does not check that focus is the same after blur, but WebKit does.
// Opt to follow Blink's behavior (see bug 687787).
if (mEventMessage == eFocusOut ||
originalWindowFocus == mOriginalFocusedContent) {
InternalFocusEvent event(true, mEventMessage);
event.mFlags.mBubbles = true;
event.mFlags.mCancelable = false;
event.mRelatedTarget = mRelatedTarget;
return EventDispatcher::Dispatch(mTarget, mContext, &event);
}
return NS_OK;
}
nsCOMPtr<nsISupports> mTarget;
RefPtr<nsPresContext> mContext;
EventMessage mEventMessage;
nsCOMPtr<nsPIDOMWindowOuter> mOriginalFocusedWindow;
nsCOMPtr<nsIContent> mOriginalFocusedContent;
nsCOMPtr<EventTarget> mRelatedTarget;
};
static nsIDocument*
GetDocumentHelper(EventTarget* aTarget)
{
nsCOMPtr<nsINode> node = do_QueryInterface(aTarget);
if (!node) {
nsCOMPtr<nsPIDOMWindowInner> win = do_QueryInterface(aTarget);
return win ? win->GetExtantDoc() : nullptr;
}
return node->OwnerDoc();
}
void nsFocusManager::SendFocusInOrOutEvent(EventMessage aEventMessage,
nsIPresShell* aPresShell,
nsISupports* aTarget,
nsPIDOMWindowOuter* aCurrentFocusedWindow,
nsIContent* aCurrentFocusedContent,
EventTarget* aRelatedTarget)
{
NS_ASSERTION(aEventMessage == eFocusIn || aEventMessage == eFocusOut,
"Wrong event type for SendFocusInOrOutEvent");
nsContentUtils::AddScriptRunner(
new FocusInOutEvent(
aTarget,
aEventMessage,
aPresShell->GetPresContext(),
aCurrentFocusedWindow,
aCurrentFocusedContent,
aRelatedTarget));
}
void
nsFocusManager::SendFocusOrBlurEvent(EventMessage aEventMessage,
nsIPresShell* aPresShell,
nsIDocument* aDocument,
nsISupports* aTarget,
uint32_t aFocusMethod,
bool aWindowRaised,
bool aIsRefocus,
EventTarget* aRelatedTarget)
{
NS_ASSERTION(aEventMessage == eFocus || aEventMessage == eBlur,
"Wrong event type for SendFocusOrBlurEvent");
nsCOMPtr<EventTarget> eventTarget = do_QueryInterface(aTarget);
nsCOMPtr<nsIDocument> eventTargetDoc = GetDocumentHelper(eventTarget);
nsCOMPtr<nsIDocument> relatedTargetDoc = GetDocumentHelper(aRelatedTarget);
nsCOMPtr<nsPIDOMWindowOuter> currentWindow = mFocusedWindow;
nsCOMPtr<nsPIDOMWindowInner> targetWindow = do_QueryInterface(aTarget);
nsCOMPtr<nsIDocument> targetDocument = do_QueryInterface(aTarget);
nsCOMPtr<nsIContent> currentFocusedContent = currentWindow ?
currentWindow->GetFocusedNode() : nullptr;
// set aRelatedTarget to null if it's not in the same document as eventTarget
if (eventTargetDoc != relatedTargetDoc) {
aRelatedTarget = nullptr;
}
bool dontDispatchEvent =
eventTargetDoc && nsContentUtils::IsUserFocusIgnored(eventTargetDoc);
// for focus events, if this event was from a mouse or key and event
// handling on the document is suppressed, queue the event and fire it
// later. For blur events, a non-zero value would be set for aFocusMethod.
if (aFocusMethod && !dontDispatchEvent &&
aDocument && aDocument->EventHandlingSuppressed()) {
// aFlags is always 0 when aWindowRaised is true so this won't be called
// on a window raise.
NS_ASSERTION(!aWindowRaised, "aWindowRaised should not be set");
for (uint32_t i = mDelayedBlurFocusEvents.Length(); i > 0; --i) {
// if this event was already queued, remove it and append it to the end
if (mDelayedBlurFocusEvents[i - 1].mEventMessage == aEventMessage &&
mDelayedBlurFocusEvents[i - 1].mPresShell == aPresShell &&
mDelayedBlurFocusEvents[i - 1].mDocument == aDocument &&
mDelayedBlurFocusEvents[i - 1].mTarget == eventTarget &&
mDelayedBlurFocusEvents[i - 1].mRelatedTarget == aRelatedTarget) {
mDelayedBlurFocusEvents.RemoveElementAt(i - 1);
}
}
mDelayedBlurFocusEvents.AppendElement(
nsDelayedBlurOrFocusEvent(aEventMessage, aPresShell,
aDocument, eventTarget, aRelatedTarget));
return;
}
#ifdef ACCESSIBILITY
nsAccessibilityService* accService = GetAccService();
if (accService) {
if (aEventMessage == eFocus) {
accService->NotifyOfDOMFocus(aTarget);
} else {
accService->NotifyOfDOMBlur(aTarget);
}
}
#endif
if (!dontDispatchEvent) {
nsContentUtils::AddScriptRunner(
new FocusBlurEvent(aTarget, aEventMessage, aPresShell->GetPresContext(),
aWindowRaised, aIsRefocus, aRelatedTarget));
// Check that the target is not a window or document before firing
// focusin/focusout. Other browsers do not fire focusin/focusout on window,
// despite being required in the spec, so follow their behavior.
//
// As for document, we should not even fire focus/blur, but until then, we
// need this check. targetDocument should be removed once bug 1228802 is
// resolved.
if (!targetWindow && !targetDocument) {
EventMessage focusInOrOutMessage = aEventMessage == eFocus ? eFocusIn : eFocusOut;
SendFocusInOrOutEvent(focusInOrOutMessage, aPresShell, aTarget,
currentWindow, currentFocusedContent, aRelatedTarget);
}
}
}
void
nsFocusManager::ScrollIntoView(nsIPresShell* aPresShell,
nsIContent* aContent,
uint32_t aFlags)
{
// if the noscroll flag isn't set, scroll the newly focused element into view
if (!(aFlags & FLAG_NOSCROLL))
aPresShell->ScrollContentIntoView(aContent,
nsIPresShell::ScrollAxis(
nsIPresShell::SCROLL_MINIMUM,
nsIPresShell::SCROLL_IF_NOT_VISIBLE),
nsIPresShell::ScrollAxis(
nsIPresShell::SCROLL_MINIMUM,
nsIPresShell::SCROLL_IF_NOT_VISIBLE),
nsIPresShell::SCROLL_OVERFLOW_HIDDEN);
}
void
nsFocusManager::RaiseWindow(nsPIDOMWindowOuter* aWindow)
{
// don't raise windows that are already raised or are in the process of
// being lowered
if (!aWindow || aWindow == mActiveWindow || aWindow == mWindowBeingLowered)
return;
if (sTestMode) {
// In test mode, emulate the existing window being lowered and the new
// window being raised.
if (mActiveWindow)
WindowLowered(mActiveWindow);
WindowRaised(aWindow);
return;
}
#if defined(XP_WIN)
// Windows would rather we focus the child widget, otherwise, the toplevel
// widget will always end up being focused. Fortunately, focusing the child
// widget will also have the effect of raising the window this widget is in.
// But on other platforms, we can just focus the toplevel widget to raise
// the window.
nsCOMPtr<nsPIDOMWindowOuter> childWindow;
GetFocusedDescendant(aWindow, true, getter_AddRefs(childWindow));
if (!childWindow)
childWindow = aWindow;
nsCOMPtr<nsIDocShell> docShell = aWindow->GetDocShell();
if (!docShell)
return;
nsCOMPtr<nsIPresShell> presShell = docShell->GetPresShell();
if (!presShell)
return;
nsViewManager* vm = presShell->GetViewManager();
if (vm) {
nsCOMPtr<nsIWidget> widget;
vm->GetRootWidget(getter_AddRefs(widget));
if (widget)
widget->SetFocus(true);
}
#else
nsCOMPtr<nsIBaseWindow> treeOwnerAsWin =
do_QueryInterface(aWindow->GetDocShell());
if (treeOwnerAsWin) {
nsCOMPtr<nsIWidget> widget;
treeOwnerAsWin->GetMainWidget(getter_AddRefs(widget));
if (widget)
widget->SetFocus(true);
}
#endif
}
void
nsFocusManager::UpdateCaretForCaretBrowsingMode()
{
UpdateCaret(false, true, mFocusedContent);
}
void
nsFocusManager::UpdateCaret(bool aMoveCaretToFocus,
bool aUpdateVisibility,
nsIContent* aContent)
{
LOGFOCUS(("Update Caret: %d %d", aMoveCaretToFocus, aUpdateVisibility));
if (!mFocusedWindow)
return;
// this is called when a document is focused or when the caretbrowsing
// preference is changed
nsCOMPtr<nsIDocShell> focusedDocShell = mFocusedWindow->GetDocShell();
nsCOMPtr<nsIDocShellTreeItem> dsti = do_QueryInterface(focusedDocShell);
if (!dsti)
return;
if (dsti->ItemType() == nsIDocShellTreeItem::typeChrome) {
return; // Never browse with caret in chrome
}
bool browseWithCaret =
Preferences::GetBool("accessibility.browsewithcaret");
nsCOMPtr<nsIPresShell> presShell = focusedDocShell->GetPresShell();
if (!presShell)
return;
// If this is an editable document which isn't contentEditable, or a
// contentEditable document and the node to focus is contentEditable,
// return, so that we don't mess with caret visibility.
bool isEditable = false;
focusedDocShell->GetEditable(&isEditable);
if (isEditable) {
nsCOMPtr<nsIHTMLDocument> doc =
do_QueryInterface(presShell->GetDocument());
bool isContentEditableDoc =
doc && doc->GetEditingState() == nsIHTMLDocument::eContentEditable;
bool isFocusEditable =
aContent && aContent->HasFlag(NODE_IS_EDITABLE);
if (!isContentEditableDoc || isFocusEditable)
return;
}
if (!isEditable && aMoveCaretToFocus)
MoveCaretToFocus(presShell, aContent);
if (!aUpdateVisibility)
return;
// XXXndeakin this doesn't seem right. It should be checking for this only
// on the nearest ancestor frame which is a chrome frame. But this is
// what the existing code does, so just leave it for now.
if (!browseWithCaret) {
nsCOMPtr<Element> docElement =
mFocusedWindow->GetFrameElementInternal();
if (docElement)
browseWithCaret = docElement->AttrValueIs(kNameSpaceID_None,
nsGkAtoms::showcaret,
NS_LITERAL_STRING("true"),
eCaseMatters);
}
SetCaretVisible(presShell, browseWithCaret, aContent);
}
void
nsFocusManager::MoveCaretToFocus(nsIPresShell* aPresShell, nsIContent* aContent)
{
// domDoc is a document interface we can create a range with
nsCOMPtr<nsIDOMDocument> domDoc = do_QueryInterface(aPresShell->GetDocument());
if (domDoc) {
RefPtr<nsFrameSelection> frameSelection = aPresShell->FrameSelection();
nsCOMPtr<nsISelection> domSelection =
frameSelection->GetSelection(SelectionType::eNormal);
if (domSelection) {
nsCOMPtr<nsIDOMNode> currentFocusNode(do_QueryInterface(aContent));
// First clear the selection. This way, if there is no currently focused
// content, the selection will just be cleared.
domSelection->RemoveAllRanges();
if (currentFocusNode) {
nsCOMPtr<nsIDOMRange> newRange;
nsresult rv = domDoc->CreateRange(getter_AddRefs(newRange));
if (NS_SUCCEEDED(rv)) {
// Set the range to the start of the currently focused node
// Make sure it's collapsed
newRange->SelectNodeContents(currentFocusNode);
nsCOMPtr<nsIDOMNode> firstChild;
currentFocusNode->GetFirstChild(getter_AddRefs(firstChild));
if (!firstChild ||
aContent->IsNodeOfType(nsINode::eHTML_FORM_CONTROL)) {
// If current focus node is a leaf, set range to before the
// node by using the parent as a container.
// This prevents it from appearing as selected.
newRange->SetStartBefore(currentFocusNode);
newRange->SetEndBefore(currentFocusNode);
}
domSelection->AddRange(newRange);
domSelection->CollapseToStart();
}
}
}
}
}
nsresult
nsFocusManager::SetCaretVisible(nsIPresShell* aPresShell,
bool aVisible,
nsIContent* aContent)
{
// When browsing with caret, make sure caret is visible after new focus
// Return early if there is no caret. This can happen for the testcase
// for bug 308025 where a window is closed in a blur handler.
RefPtr<nsCaret> caret = aPresShell->GetCaret();
if (!caret)
return NS_OK;
bool caretVisible = caret->IsVisible();
if (!aVisible && !caretVisible)
return NS_OK;
RefPtr<nsFrameSelection> frameSelection;
if (aContent) {
NS_ASSERTION(aContent->GetComposedDoc() == aPresShell->GetDocument(),
"Wrong document?");
nsIFrame *focusFrame = aContent->GetPrimaryFrame();
if (focusFrame)
frameSelection = focusFrame->GetFrameSelection();
}
RefPtr<nsFrameSelection> docFrameSelection = aPresShell->FrameSelection();
if (docFrameSelection && caret &&
(frameSelection == docFrameSelection || !aContent)) {
nsISelection* domSelection =
docFrameSelection->GetSelection(SelectionType::eNormal);
if (domSelection) {
nsCOMPtr<nsISelectionController> selCon(do_QueryInterface(aPresShell));
if (!selCon) {
return NS_ERROR_FAILURE;
}
// First, hide the caret to prevent attempting to show it in SetCaretDOMSelection
selCon->SetCaretEnabled(false);
// Caret must blink on non-editable elements
caret->SetIgnoreUserModify(true);
// Tell the caret which selection to use
caret->SetSelection(domSelection);
// In content, we need to set the caret. The only special case is edit
// fields, which have a different frame selection from the document.
// They will take care of making the caret visible themselves.
selCon->SetCaretReadOnly(false);
selCon->SetCaretEnabled(aVisible);
}
}
return NS_OK;
}
nsresult
nsFocusManager::GetSelectionLocation(nsIDocument* aDocument,
nsIPresShell* aPresShell,
nsIContent **aStartContent,
nsIContent **aEndContent)
{
*aStartContent = *aEndContent = nullptr;
nsresult rv = NS_ERROR_FAILURE;
nsPresContext* presContext = aPresShell->GetPresContext();
NS_ASSERTION(presContext, "mPresContent is null!!");
RefPtr<nsFrameSelection> frameSelection = aPresShell->FrameSelection();
nsCOMPtr<nsISelection> domSelection;
if (frameSelection) {
domSelection = frameSelection->GetSelection(SelectionType::eNormal);
}
nsCOMPtr<nsIDOMNode> startNode, endNode;
bool isCollapsed = false;
nsCOMPtr<nsIContent> startContent, endContent;
int32_t startOffset = 0;
if (domSelection) {
domSelection->GetIsCollapsed(&isCollapsed);
nsCOMPtr<nsIDOMRange> domRange;
rv = domSelection->GetRangeAt(0, getter_AddRefs(domRange));
if (domRange) {
domRange->GetStartContainer(getter_AddRefs(startNode));
domRange->GetEndContainer(getter_AddRefs(endNode));
domRange->GetStartOffset(&startOffset);
nsIContent *childContent = nullptr;
startContent = do_QueryInterface(startNode);
if (startContent && startContent->IsElement()) {
NS_ASSERTION(startOffset >= 0, "Start offset cannot be negative");
childContent = startContent->GetChildAt(startOffset);
if (childContent) {
startContent = childContent;
}
}
endContent = do_QueryInterface(endNode);
if (endContent && endContent->IsElement()) {
int32_t endOffset = 0;
domRange->GetEndOffset(&endOffset);
NS_ASSERTION(endOffset >= 0, "End offset cannot be negative");
childContent = endContent->GetChildAt(endOffset);
if (childContent) {
endContent = childContent;
}
}
}
}
else {
rv = NS_ERROR_INVALID_ARG;
}
nsIFrame *startFrame = nullptr;
if (startContent) {
startFrame = startContent->GetPrimaryFrame();
if (isCollapsed) {
// Next check to see if our caret is at the very end of a node
// If so, the caret is actually sitting in front of the next
// logical frame's primary node - so for this case we need to
// change caretContent to that node.
if (startContent->NodeType() == nsIDOMNode::TEXT_NODE) {
nsAutoString nodeValue;
startContent->AppendTextTo(nodeValue);
bool isFormControl =
startContent->IsNodeOfType(nsINode::eHTML_FORM_CONTROL);
if (nodeValue.Length() == (uint32_t)startOffset && !isFormControl &&
startContent != aDocument->GetRootElement()) {
// Yes, indeed we were at the end of the last node
nsCOMPtr<nsIFrameEnumerator> frameTraversal;
nsresult rv = NS_NewFrameTraversal(getter_AddRefs(frameTraversal),
presContext, startFrame,
eLeaf,
false, // aVisual
false, // aLockInScrollView
true, // aFollowOOFs
false // aSkipPopupChecks
);
NS_ENSURE_SUCCESS(rv, rv);
nsIFrame *newCaretFrame = nullptr;
nsCOMPtr<nsIContent> newCaretContent = startContent;
bool endOfSelectionInStartNode(startContent == endContent);
do {
// Continue getting the next frame until the primary content for the frame
// we are on changes - we don't want to be stuck in the same place
frameTraversal->Next();
newCaretFrame = static_cast<nsIFrame*>(frameTraversal->CurrentItem());
if (nullptr == newCaretFrame)
break;
newCaretContent = newCaretFrame->GetContent();
} while (!newCaretContent || newCaretContent == startContent);
if (newCaretFrame && newCaretContent) {
// If the caret is exactly at the same position of the new frame,
// then we can use the newCaretFrame and newCaretContent for our position
nsRect caretRect;
nsIFrame *frame = nsCaret::GetGeometry(domSelection, &caretRect);
if (frame) {
nsPoint caretWidgetOffset;
nsIWidget *widget = frame->GetNearestWidget(caretWidgetOffset);
caretRect.MoveBy(caretWidgetOffset);
nsPoint newCaretOffset;
nsIWidget *newCaretWidget = newCaretFrame->GetNearestWidget(newCaretOffset);
if (widget == newCaretWidget && caretRect.y == newCaretOffset.y &&
caretRect.x == newCaretOffset.x) {
// The caret is at the start of the new element.
startFrame = newCaretFrame;
startContent = newCaretContent;
if (endOfSelectionInStartNode) {
endContent = newCaretContent; // Ensure end of selection is not before start
}
}
}
}
}
}
}
}
*aStartContent = startContent;
*aEndContent = endContent;
NS_IF_ADDREF(*aStartContent);
NS_IF_ADDREF(*aEndContent);
return rv;
}
nsresult
nsFocusManager::DetermineElementToMoveFocus(nsPIDOMWindowOuter* aWindow,
nsIContent* aStartContent,
int32_t aType, bool aNoParentTraversal,
nsIContent** aNextContent)
{
*aNextContent = nullptr;
// True if we are navigating by document (F6/Shift+F6) or false if we are
// navigating by element (Tab/Shift+Tab).
bool forDocumentNavigation = false;
// This is used for document navigation only. It will be set to true if we
// start navigating from a starting point. If this starting point is near the
// end of the document (for example, an element on a statusbar), and there
// are no child documents or panels before the end of the document, then we
// will need to ensure that we don't consider the root chrome window when we
// loop around and instead find the next child document/panel, as focus is
// already in that window. This flag will be cleared once we navigate into
// another document.
bool mayFocusRoot = (aStartContent != nullptr);
nsCOMPtr<nsIContent> startContent = aStartContent;
if (!startContent && aType != MOVEFOCUS_CARET) {
if (aType == MOVEFOCUS_FORWARDDOC || aType == MOVEFOCUS_BACKWARDDOC) {
// When moving between documents, make sure to get the right
// starting content in a descendant.
nsCOMPtr<nsPIDOMWindowOuter> focusedWindow;
startContent = GetFocusedDescendant(aWindow, true, getter_AddRefs(focusedWindow));
}
else if (aType != MOVEFOCUS_LASTDOC) {
// Otherwise, start at the focused node. If MOVEFOCUS_LASTDOC is used,
// then we are document-navigating backwards from chrome to the content
// process, and we don't want to use this so that we start from the end
// of the document.
startContent = aWindow->GetFocusedNode();
}
}
nsCOMPtr<nsIDocument> doc;
if (startContent)
doc = startContent->GetComposedDoc();
else
doc = aWindow->GetExtantDoc();
if (!doc)
return NS_OK;
LookAndFeel::GetInt(LookAndFeel::eIntID_TabFocusModel,
&nsIContent::sTabFocusModel);
// These types are for document navigation using F6.
if (aType == MOVEFOCUS_FORWARDDOC || aType == MOVEFOCUS_BACKWARDDOC ||
aType == MOVEFOCUS_FIRSTDOC || aType == MOVEFOCUS_LASTDOC) {
forDocumentNavigation = true;
}
// If moving to the root or first document, find the root element and return.
if (aType == MOVEFOCUS_ROOT || aType == MOVEFOCUS_FIRSTDOC) {
NS_IF_ADDREF(*aNextContent = GetRootForFocus(aWindow, doc, false, false));
if (!*aNextContent && aType == MOVEFOCUS_FIRSTDOC) {
// When looking for the first document, if the root wasn't focusable,
// find the next focusable document.
aType = MOVEFOCUS_FORWARDDOC;
} else {
return NS_OK;
}
}
nsIContent* rootContent = doc->GetRootElement();
NS_ENSURE_TRUE(rootContent, NS_OK);
nsIPresShell *presShell = doc->GetShell();
NS_ENSURE_TRUE(presShell, NS_OK);
if (aType == MOVEFOCUS_FIRST) {
if (!aStartContent)
startContent = rootContent;
return GetNextTabbableContent(presShell, startContent,
nullptr, startContent,
true, 1, false, false, aNextContent);
}
if (aType == MOVEFOCUS_LAST) {
if (!aStartContent)
startContent = rootContent;
return GetNextTabbableContent(presShell, startContent,
nullptr, startContent,
false, 0, false, false, aNextContent);
}
bool forward = (aType == MOVEFOCUS_FORWARD ||
aType == MOVEFOCUS_FORWARDDOC ||
aType == MOVEFOCUS_CARET);
bool doNavigation = true;
bool ignoreTabIndex = false;
// when a popup is open, we want to ensure that tab navigation occurs only
// within the most recently opened panel. If a popup is open, its frame will
// be stored in popupFrame.
nsIFrame* popupFrame = nullptr;
int32_t tabIndex = forward ? 1 : 0;
if (startContent) {
nsIFrame* frame = startContent->GetPrimaryFrame();
if (startContent->IsHTMLElement(nsGkAtoms::area))
startContent->IsFocusable(&tabIndex);
else if (frame)
frame->IsFocusable(&tabIndex, 0);
else
startContent->IsFocusable(&tabIndex);
// if the current element isn't tabbable, ignore the tabindex and just
// look for the next element. The root content won't have a tabindex
// so just treat this as the beginning of the tab order.
if (tabIndex < 0) {
tabIndex = 1;
if (startContent != rootContent)
ignoreTabIndex = true;
}
// check if the focus is currently inside a popup. Elements such as the
// autocomplete widget use the noautofocus attribute to allow the focus to
// remain outside the popup when it is opened.
if (frame) {
popupFrame = nsLayoutUtils::GetClosestFrameOfType(frame,
nsGkAtoms::menuPopupFrame);
}
if (popupFrame && !forDocumentNavigation) {
// Don't navigate outside of a popup, so pretend that the
// root content is the popup itself
rootContent = popupFrame->GetContent();
NS_ASSERTION(rootContent, "Popup frame doesn't have a content node");
}
else if (!forward) {
// If focus moves backward and when current focused node is root
// content or <body> element which is editable by contenteditable
// attribute, focus should move to its parent document.
if (startContent == rootContent) {
doNavigation = false;
} else {
nsIDocument* doc = startContent->GetComposedDoc();
if (startContent ==
nsLayoutUtils::GetEditableRootContentByContentEditable(doc)) {
doNavigation = false;
}
}
}
}
else {
#ifdef MOZ_XUL
if (aType != MOVEFOCUS_CARET) {
// if there is no focus, yet a panel is open, focus the first item in
// the panel
nsXULPopupManager* pm = nsXULPopupManager::GetInstance();
if (pm)
popupFrame = pm->GetTopPopup(ePopupTypePanel);
}
#endif
if (popupFrame) {
// When there is a popup open, and no starting content, start the search
// at the topmost popup.
startContent = popupFrame->GetContent();
NS_ASSERTION(startContent, "Popup frame doesn't have a content node");
// Unless we are searching for documents, set the root content to the
// popup as well, so that we don't tab-navigate outside the popup.
// When navigating by documents, we start at the popup but can navigate
// outside of it to look for other panels and documents.
if (!forDocumentNavigation) {
rootContent = startContent;
}
doc = startContent ? startContent->GetComposedDoc() : nullptr;
}
else {
// Otherwise, for content shells, start from the location of the caret.
nsCOMPtr<nsIDocShell> docShell = aWindow->GetDocShell();
if (docShell && docShell->ItemType() != nsIDocShellTreeItem::typeChrome) {
nsCOMPtr<nsIContent> endSelectionContent;
GetSelectionLocation(doc, presShell,
getter_AddRefs(startContent),
getter_AddRefs(endSelectionContent));
// If the selection is on the rootContent, then there is no selection
if (startContent == rootContent) {
startContent = nullptr;
}
if (aType == MOVEFOCUS_CARET) {
// GetFocusInSelection finds a focusable link near the caret.
// If there is no start content though, don't do this to avoid
// focusing something unexpected.
if (startContent) {
GetFocusInSelection(aWindow, startContent,
endSelectionContent, aNextContent);
}
return NS_OK;
}
if (startContent) {
// when starting from a selection, we always want to find the next or
// previous element in the document. So the tabindex on elements
// should be ignored.
ignoreTabIndex = true;
}
}
if (!startContent) {
// otherwise, just use the root content as the starting point
startContent = rootContent;
NS_ENSURE_TRUE(startContent, NS_OK);
}
}
}
// Check if the starting content is the same as the content assigned to the
// retargetdocumentfocus attribute. Is so, we don't want to start searching
// from there but instead from the beginning of the document. Otherwise, the
// content that appears before the retargetdocumentfocus element will never
// get checked as it will be skipped when the focus is retargetted to it.
if (forDocumentNavigation && doc->IsXULDocument()) {
nsAutoString retarget;
if (rootContent->GetAttr(kNameSpaceID_None,
nsGkAtoms::retargetdocumentfocus, retarget)) {
nsIContent* retargetElement = doc->GetElementById(retarget);
// The common case here is the urlbar where focus is on the anonymous
// input inside the textbox, but the retargetdocumentfocus attribute
// refers to the textbox. The Contains check will return false and the
// ContentIsDescendantOf check will return true in this case.
if (retargetElement && (retargetElement == startContent ||
(!retargetElement->Contains(startContent) &&
nsContentUtils::ContentIsDescendantOf(startContent, retargetElement)))) {
startContent = rootContent;
}
}
}
NS_ASSERTION(startContent, "starting content not set");
// keep a reference to the starting content. If we find that again, it means
// we've iterated around completely and we don't want to adjust the focus.
// The skipOriginalContentCheck will be set to true only for the first time
// GetNextTabbableContent is called. This ensures that we don't break out
// when nothing is focused to start with. Specifically,
// GetNextTabbableContent first checks the root content -- which happens to
// be the same as the start content -- when nothing is focused and tabbing
// forward. Without skipOriginalContentCheck set to true, we'd end up
// returning right away and focusing nothing. Luckily, GetNextTabbableContent
// will never wrap around on its own, and can only return the original
// content when it is called a second time or later.
bool skipOriginalContentCheck = true;
nsIContent* originalStartContent = startContent;
LOGCONTENTNAVIGATION("Focus Navigation Start Content %s", startContent.get());
LOGFOCUSNAVIGATION((" Forward: %d Tabindex: %d Ignore: %d DocNav: %d",
forward, tabIndex, ignoreTabIndex, forDocumentNavigation));
while (doc) {
if (doNavigation) {
nsCOMPtr<nsIContent> nextFocus;
nsresult rv = GetNextTabbableContent(presShell, rootContent,
skipOriginalContentCheck ? nullptr : originalStartContent,
startContent, forward,
tabIndex, ignoreTabIndex,
forDocumentNavigation,
getter_AddRefs(nextFocus));
NS_ENSURE_SUCCESS(rv, rv);
if (rv == NS_SUCCESS_DOM_NO_OPERATION) {
// Navigation was redirected to a child process, so just return.
return NS_OK;
}
// found a content node to focus.
if (nextFocus) {
LOGCONTENTNAVIGATION("Next Content: %s", nextFocus.get());
// as long as the found node was not the same as the starting node,
// set it as the return value. For document navigation, we can return
// the same element in case there is only one content node that could
// be returned, for example, in a child process document.
if (nextFocus != originalStartContent || forDocumentNavigation) {
nextFocus.forget(aNextContent);
}
return NS_OK;
}
if (popupFrame && !forDocumentNavigation) {
// in a popup, so start again from the beginning of the popup. However,
// if we already started at the beginning, then there isn't anything to
// focus, so just return
if (startContent != rootContent) {
startContent = rootContent;
tabIndex = forward ? 1 : 0;
continue;
}
return NS_OK;
}
}
doNavigation = true;
skipOriginalContentCheck = forDocumentNavigation;
ignoreTabIndex = false;
if (aNoParentTraversal) {
if (startContent == rootContent)
return NS_OK;
startContent = rootContent;
tabIndex = forward ? 1 : 0;
continue;
}
// Reached the beginning or end of the document. Next, navigate up to the
// parent document and try again.
nsCOMPtr<nsPIDOMWindowOuter> piWindow = doc->GetWindow();
NS_ENSURE_TRUE(piWindow, NS_ERROR_FAILURE);
nsCOMPtr<nsIDocShell> docShell = piWindow->GetDocShell();
NS_ENSURE_TRUE(docShell, NS_ERROR_FAILURE);
// Get the frame element this window is inside and, from that, get the
// parent document and presshell. If there is no enclosing frame element,
// then this is a top-level, embedded or remote window.
startContent = piWindow->GetFrameElementInternal();
if (startContent) {
doc = startContent->GetComposedDoc();
NS_ENSURE_TRUE(doc, NS_ERROR_FAILURE);
rootContent = doc->GetRootElement();
presShell = doc->GetShell();
// We can focus the root element now that we have moved to another document.
mayFocusRoot = true;
nsIFrame* frame = startContent->GetPrimaryFrame();
if (!frame) {
return NS_OK;
}
frame->IsFocusable(&tabIndex, 0);
if (tabIndex < 0) {
tabIndex = 1;
ignoreTabIndex = true;
}
// if the frame is inside a popup, make sure to scan only within the
// popup. This handles the situation of tabbing amongst elements
// inside an iframe which is itself inside a popup. Otherwise,
// navigation would move outside the popup when tabbing outside the
// iframe.
if (!forDocumentNavigation) {
popupFrame = nsLayoutUtils::GetClosestFrameOfType(frame,
nsGkAtoms::menuPopupFrame);
if (popupFrame) {
rootContent = popupFrame->GetContent();
NS_ASSERTION(rootContent, "Popup frame doesn't have a content node");
}
}
}
else {
// There is no parent, so call the tree owner. This will tell the
// embedder or parent process that it should take the focus.
bool tookFocus;
docShell->TabToTreeOwner(forward, forDocumentNavigation, &tookFocus);
// If the tree owner took the focus, blur the current content.
if (tookFocus) {
nsCOMPtr<nsPIDOMWindowOuter> window = docShell->GetWindow();
if (window->GetFocusedNode() == mFocusedContent)
Blur(mFocusedWindow, nullptr, true, true);
else
window->SetFocusedNode(nullptr);
return NS_OK;
}
// If we have reached the end of the top-level document, focus the
// first element in the top-level document. This should always happen
// when navigating by document forwards but when navigating backwards,
// only do this if we started in another document or within a popup frame.
// If the focus started in this window outside a popup however, we should
// continue by looping around to the end again.
if (forDocumentNavigation && (forward || mayFocusRoot || popupFrame)) {
// HTML content documents can have their root element focused (a focus
// ring appears around the entire content area frame). This root
// appears in the tab order before all of the elements in the document.
// Chrome documents however cannot be focused directly, so instead we
// focus the first focusable element within the window.
// For example, the urlbar.
nsIContent* root = GetRootForFocus(piWindow, doc, true, true);
return FocusFirst(root, aNextContent);
}
// Once we have hit the top-level and have iterated to the end again, we
// just want to break out next time we hit this spot to prevent infinite
// iteration.
mayFocusRoot = true;
// reset the tab index and start again from the beginning or end
startContent = rootContent;
tabIndex = forward ? 1 : 0;
}
// wrapped all the way around and didn't find anything to move the focus
// to, so just break out
if (startContent == originalStartContent)
break;
}
return NS_OK;
}
nsresult
nsFocusManager::GetNextTabbableContent(nsIPresShell* aPresShell,
nsIContent* aRootContent,
nsIContent* aOriginalStartContent,
nsIContent* aStartContent,
bool aForward,
int32_t aCurrentTabIndex,
bool aIgnoreTabIndex,
bool aForDocumentNavigation,
nsIContent** aResultContent)
{
*aResultContent = nullptr;
nsCOMPtr<nsIContent> startContent = aStartContent;
if (!startContent)
return NS_OK;
LOGCONTENTNAVIGATION("GetNextTabbable: %s", aStartContent);
LOGFOCUSNAVIGATION((" tabindex: %d", aCurrentTabIndex));
nsPresContext* presContext = aPresShell->GetPresContext();
bool getNextFrame = true;
nsCOMPtr<nsIContent> iterStartContent = aStartContent;
while (1) {
nsIFrame* startFrame = iterStartContent->GetPrimaryFrame();
// if there is no frame, look for another content node that has a frame
if (!startFrame) {
// if the root content doesn't have a frame, just return
if (iterStartContent == aRootContent)
return NS_OK;
// look for the next or previous content node in tree order
iterStartContent = aForward ? iterStartContent->GetNextNode() : iterStartContent->GetPreviousContent();
// we've already skipped over the initial focused content, so we
// don't want to traverse frames.
getNextFrame = false;
if (iterStartContent)
continue;
// otherwise, as a last attempt, just look at the root content
iterStartContent = aRootContent;
continue;
}
// For tab navigation, pass false for aSkipPopupChecks so that we don't
// iterate into or out of a popup. For document naviation pass true to
// ignore these boundaries.
nsCOMPtr<nsIFrameEnumerator> frameTraversal;
nsresult rv = NS_NewFrameTraversal(getter_AddRefs(frameTraversal),
presContext, startFrame,
ePreOrder,
false, // aVisual
false, // aLockInScrollView
true, // aFollowOOFs
aForDocumentNavigation // aSkipPopupChecks
);
NS_ENSURE_SUCCESS(rv, rv);
if (iterStartContent == aRootContent) {
if (!aForward) {
frameTraversal->Last();
} else if (aRootContent->IsFocusable()) {
frameTraversal->Next();
}
}
else if (getNextFrame &&
(!iterStartContent ||
!iterStartContent->IsHTMLElement(nsGkAtoms::area))) {
// Need to do special check in case we're in an imagemap which has multiple
// content nodes per frame, so don't skip over the starting frame.
if (aForward)
frameTraversal->Next();
else
frameTraversal->Prev();
}
// Walk frames to find something tabbable matching mCurrentTabIndex
nsIFrame* frame = static_cast<nsIFrame*>(frameTraversal->CurrentItem());
while (frame) {
nsIContent* currentContent = frame->GetContent();
// For document navigation, check if this element is an open panel. Since
// panels aren't focusable (tabIndex would be -1), we'll just assume that
// for document navigation, the tabIndex is 0.
if (aForDocumentNavigation && currentContent && (aCurrentTabIndex == 0) &&
currentContent->IsXULElement(nsGkAtoms::panel)) {
nsMenuPopupFrame* popupFrame = do_QueryFrame(frame);
// Check if the panel is open. Closed panels are ignored since you can't
// focus anything in them.
if (popupFrame && popupFrame->IsOpen()) {
// When moving backward, skip the popup we started in otherwise it
// will be selected again.
bool validPopup = true;
if (!aForward) {
nsIContent* content = aStartContent;
while (content) {
if (content == currentContent) {
validPopup = false;
break;
}
content = content->GetParent();
}
}
if (validPopup) {
// Since a panel isn't focusable itself, find the first focusable
// content within the popup. If there isn't any focusable content
// in the popup, skip this popup and continue iterating through the
// frames. We pass the panel itself (currentContent) as the starting
// and root content, so that we only find content within the panel.
// Note also that we pass false for aForDocumentNavigation since we
// want to locate the first content, not the first document.
rv = GetNextTabbableContent(aPresShell, currentContent,
nullptr, currentContent,
true, 1, false, false,
aResultContent);
if (NS_SUCCEEDED(rv) && *aResultContent) {
return rv;
}
}
}
}
// TabIndex not set defaults to 0 for form elements, anchors and other
// elements that are normally focusable. Tabindex defaults to -1
// for elements that are not normally focusable.
// The returned computed tabindex from IsFocusable() is as follows:
// < 0 not tabbable at all
// == 0 in normal tab order (last after positive tabindexed items)
// > 0 can be tabbed to in the order specified by this value
int32_t tabIndex;
frame->IsFocusable(&tabIndex, 0);
LOGCONTENTNAVIGATION("Next Tabbable %s:", frame->GetContent());
LOGFOCUSNAVIGATION((" with tabindex: %d expected: %d", tabIndex, aCurrentTabIndex));
if (tabIndex >= 0) {
NS_ASSERTION(currentContent, "IsFocusable set a tabindex for a frame with no content");
if (!aForDocumentNavigation &&
currentContent->IsHTMLElement(nsGkAtoms::img) &&
currentContent->HasAttr(kNameSpaceID_None, nsGkAtoms::usemap)) {
// This is an image with a map. Image map areas are not traversed by
// nsIFrameTraversal so look for the next or previous area element.
nsIContent *areaContent =
GetNextTabbableMapArea(aForward, aCurrentTabIndex,
currentContent, iterStartContent);
if (areaContent) {
NS_ADDREF(*aResultContent = areaContent);
return NS_OK;
}
}
else if (aIgnoreTabIndex || aCurrentTabIndex == tabIndex) {
// break out if we've wrapped around to the start again.
if (aOriginalStartContent && currentContent == aOriginalStartContent) {
NS_ADDREF(*aResultContent = currentContent);
return NS_OK;
}
// If this is a remote child browser, call NavigateDocument to have
// the child process continue the navigation. Return a special error
// code to have the caller return early. If the child ends up not
// being focusable in some way, the child process will call back
// into document navigation again by calling MoveFocus.
TabParent* remote = TabParent::GetFrom(currentContent);
if (remote) {
remote->NavigateByKey(aForward, aForDocumentNavigation);
return NS_SUCCESS_DOM_NO_OPERATION;
}
// Next, for document navigation, check if this a non-remote child document.
bool checkSubDocument = true;
if (aForDocumentNavigation) {
nsIContent* docRoot = GetRootForChildDocument(currentContent);
if (docRoot) {
// If GetRootForChildDocument returned something then call
// FocusFirst to find the root or first element to focus within
// the child document. If this is a frameset though, skip this and
// fall through to the checkSubDocument block below to iterate into
// the frameset's frames and locate the first focusable frame.
if (!docRoot->IsHTMLElement(nsGkAtoms::frameset)) {
return FocusFirst(docRoot, aResultContent);
}
} else {
// Set checkSubDocument to false, as this was neither a frame
// type element or a child document that was focusable.
checkSubDocument = false;
}
}
if (checkSubDocument) {
// found a node with a matching tab index. Check if it is a child
// frame. If so, navigate into the child frame instead.
nsIDocument* doc = currentContent->GetComposedDoc();
NS_ASSERTION(doc, "content not in document");
nsIDocument* subdoc = doc->GetSubDocumentFor(currentContent);
if (subdoc && !subdoc->EventHandlingSuppressed()) {
if (aForward) {
// when tabbing forward into a frame, return the root
// frame so that the canvas becomes focused.
nsCOMPtr<nsPIDOMWindowOuter> subframe = subdoc->GetWindow();
if (subframe) {
*aResultContent = GetRootForFocus(subframe, subdoc, false, true);
if (*aResultContent) {
NS_ADDREF(*aResultContent);
return NS_OK;
}
}
}
Element* rootElement = subdoc->GetRootElement();
nsIPresShell* subShell = subdoc->GetShell();
if (rootElement && subShell) {
rv = GetNextTabbableContent(subShell, rootElement,
aOriginalStartContent, rootElement,
aForward, (aForward ? 1 : 0),
false, aForDocumentNavigation, aResultContent);
NS_ENSURE_SUCCESS(rv, rv);
if (*aResultContent)
return NS_OK;
}
}
// otherwise, use this as the next content node to tab to, unless
// this was the element we started on. This would happen for
// instance on an element with child frames, where frame navigation
// could return the original element again. In that case, just skip
// it. Also, if the next content node is the root content, then
// return it. This latter case would happen only if someone made a
// popup focusable.
// Also, when going backwards, check to ensure that the focus
// wouldn't be redirected. Otherwise, for example, when an input in
// a textbox is focused, the enclosing textbox would be found and
// the same inner input would be returned again.
else if (currentContent == aRootContent ||
(currentContent != startContent &&
(aForward || !GetRedirectedFocus(currentContent)))) {
NS_ADDREF(*aResultContent = currentContent);
return NS_OK;
}
}
}
}
else if (aOriginalStartContent && currentContent == aOriginalStartContent) {
// not focusable, so return if we have wrapped around to the original
// content. This is necessary in case the original starting content was
// not focusable.
NS_ADDREF(*aResultContent = currentContent);
return NS_OK;
}
// Move to the next or previous frame, but ignore continuation frames
// since only the first frame should be involved in focusability.
// Otherwise, a loop will occur in the following example:
// <span tabindex="1">...<a/><a/>...</span>
// where the text wraps onto multiple lines. Tabbing from the second
// link can find one of the span's continuation frames between the link
// and the end of the span, and the span would end up getting focused
// again.
do {
if (aForward)
frameTraversal->Next();
else
frameTraversal->Prev();
frame = static_cast<nsIFrame*>(frameTraversal->CurrentItem());
} while (frame && frame->GetPrevContinuation());
}
// If already at lowest priority tab (0), end search completely.
// A bit counterintuitive but true, tabindex order goes 1, 2, ... 32767, 0
if (aCurrentTabIndex == (aForward ? 0 : 1)) {
// if going backwards, the canvas should be focused once the beginning
// has been reached, so get the root element.
if (!aForward) {
nsCOMPtr<nsPIDOMWindowOuter> window = GetCurrentWindow(aRootContent);
NS_ENSURE_TRUE(window, NS_ERROR_FAILURE);
nsCOMPtr<nsIContent> docRoot =
GetRootForFocus(window, aRootContent->GetComposedDoc(), false, true);
FocusFirst(docRoot, aResultContent);
}
break;
}
// continue looking for next highest priority tabindex
aCurrentTabIndex = GetNextTabIndex(aRootContent, aCurrentTabIndex, aForward);
startContent = iterStartContent = aRootContent;
}
return NS_OK;
}
nsIContent*
nsFocusManager::GetNextTabbableMapArea(bool aForward,
int32_t aCurrentTabIndex,
nsIContent* aImageContent,
nsIContent* aStartContent)
{
nsAutoString useMap;
aImageContent->GetAttr(kNameSpaceID_None, nsGkAtoms::usemap, useMap);
nsCOMPtr<nsIDocument> doc = aImageContent->GetComposedDoc();
if (doc) {
nsCOMPtr<nsIContent> mapContent = doc->FindImageMap(useMap);
if (!mapContent)
return nullptr;
uint32_t count = mapContent->GetChildCount();
// First see if the the start content is in this map
int32_t index = mapContent->IndexOf(aStartContent);
int32_t tabIndex;
if (index < 0 || (aStartContent->IsFocusable(&tabIndex) &&
tabIndex != aCurrentTabIndex)) {
// If aStartContent is in this map we must start iterating past it.
// We skip the case where aStartContent has tabindex == aStartContent
// since the next tab ordered element might be before it
// (or after for backwards) in the child list.
index = aForward ? -1 : (int32_t)count;
}
// GetChildAt will return nullptr if our index < 0 or index >= count
nsCOMPtr<nsIContent> areaContent;
while ((areaContent = mapContent->GetChildAt(aForward ? ++index : --index)) != nullptr) {
if (areaContent->IsFocusable(&tabIndex) && tabIndex == aCurrentTabIndex) {
return areaContent;
}
}
}
return nullptr;
}
int32_t
nsFocusManager::GetNextTabIndex(nsIContent* aParent,
int32_t aCurrentTabIndex,
bool aForward)
{
int32_t tabIndex, childTabIndex;
if (aForward) {
tabIndex = 0;
for (nsIContent* child = aParent->GetFirstChild();
child;
child = child->GetNextSibling()) {
childTabIndex = GetNextTabIndex(child, aCurrentTabIndex, aForward);
if (childTabIndex > aCurrentTabIndex && childTabIndex != tabIndex) {
tabIndex = (tabIndex == 0 || childTabIndex < tabIndex) ? childTabIndex : tabIndex;
}
nsAutoString tabIndexStr;
child->GetAttr(kNameSpaceID_None, nsGkAtoms::tabindex, tabIndexStr);
nsresult ec;
int32_t val = tabIndexStr.ToInteger(&ec);
if (NS_SUCCEEDED (ec) && val > aCurrentTabIndex && val != tabIndex) {
tabIndex = (tabIndex == 0 || val < tabIndex) ? val : tabIndex;
}
}
}
else { /* !aForward */
tabIndex = 1;
for (nsIContent* child = aParent->GetFirstChild();
child;
child = child->GetNextSibling()) {
childTabIndex = GetNextTabIndex(child, aCurrentTabIndex, aForward);
if ((aCurrentTabIndex == 0 && childTabIndex > tabIndex) ||
(childTabIndex < aCurrentTabIndex && childTabIndex > tabIndex)) {
tabIndex = childTabIndex;
}
nsAutoString tabIndexStr;
child->GetAttr(kNameSpaceID_None, nsGkAtoms::tabindex, tabIndexStr);
nsresult ec;
int32_t val = tabIndexStr.ToInteger(&ec);
if (NS_SUCCEEDED (ec)) {
if ((aCurrentTabIndex == 0 && val > tabIndex) ||
(val < aCurrentTabIndex && val > tabIndex) ) {
tabIndex = val;
}
}
}
}
return tabIndex;
}
nsresult
nsFocusManager::FocusFirst(nsIContent* aRootContent, nsIContent** aNextContent)
{
if (!aRootContent) {
return NS_OK;
}
nsIDocument* doc = aRootContent->GetComposedDoc();
if (doc) {
if (doc->IsXULDocument()) {
// If the redirectdocumentfocus attribute is set, redirect the focus to a
// specific element. This is primarily used to retarget the focus to the
// urlbar during document navigation.
nsAutoString retarget;
if (aRootContent->GetAttr(kNameSpaceID_None,
nsGkAtoms::retargetdocumentfocus, retarget)) {
nsCOMPtr<nsIContent> retargetElement =
CheckIfFocusable(doc->GetElementById(retarget), 0);
if (retargetElement) {
retargetElement.forget(aNextContent);
return NS_OK;
}
}
}
nsCOMPtr<nsIDocShell> docShell = doc->GetDocShell();
if (docShell->ItemType() == nsIDocShellTreeItem::typeChrome) {
// If the found content is in a chrome shell, navigate forward one
// tabbable item so that the first item is focused. Note that we
// always go forward and not back here.
nsIPresShell* presShell = doc->GetShell();
if (presShell) {
return GetNextTabbableContent(presShell, aRootContent,
nullptr, aRootContent,
true, 1, false, false,
aNextContent);
}
}
}
NS_ADDREF(*aNextContent = aRootContent);
return NS_OK;
}
nsIContent*
nsFocusManager::GetRootForFocus(nsPIDOMWindowOuter* aWindow,
nsIDocument* aDocument,
bool aForDocumentNavigation,
bool aCheckVisibility)
{
if (!aForDocumentNavigation) {
nsCOMPtr<nsIDocShell> docShell = aWindow->GetDocShell();
if (docShell->ItemType() == nsIDocShellTreeItem::typeChrome) {
return nullptr;
}
}
if (aCheckVisibility && !IsWindowVisible(aWindow))
return nullptr;
// If the body is contenteditable, use the editor's root element rather than
// the actual root element.
nsCOMPtr<nsIContent> rootElement =
nsLayoutUtils::GetEditableRootContentByContentEditable(aDocument);
if (!rootElement || !rootElement->GetPrimaryFrame()) {
rootElement = aDocument->GetRootElement();
if (!rootElement) {
return nullptr;
}
}
if (aCheckVisibility && !rootElement->GetPrimaryFrame()) {
return nullptr;
}
// Finally, check if this is a frameset
nsCOMPtr<nsIHTMLDocument> htmlDoc = do_QueryInterface(aDocument);
if (htmlDoc) {
nsIContent* htmlChild = aDocument->GetHtmlChildElement(nsGkAtoms::frameset);
if (htmlChild) {
// In document navigation mode, return the frameset so that navigation
// descends into the child frames.
return aForDocumentNavigation ? htmlChild : nullptr;
}
}
return rootElement;
}
nsIContent*
nsFocusManager::GetRootForChildDocument(nsIContent* aContent)
{
// Check for elements that represent child documents, that is, browsers,
// editors or frames from a frameset. We don't include iframes since we
// consider them to be an integral part of the same window or page.
if (!aContent ||
!(aContent->IsXULElement(nsGkAtoms::browser) ||
aContent->IsXULElement(nsGkAtoms::editor) ||
aContent->IsHTMLElement(nsGkAtoms::frame))) {
return nullptr;
}
nsIDocument* doc = aContent->GetComposedDoc();
if (!doc) {
return nullptr;
}
nsIDocument* subdoc = doc->GetSubDocumentFor(aContent);
if (!subdoc || subdoc->EventHandlingSuppressed()) {
return nullptr;
}
nsCOMPtr<nsPIDOMWindowOuter> window = subdoc->GetWindow();
return GetRootForFocus(window, subdoc, true, true);
}
void
nsFocusManager::GetFocusInSelection(nsPIDOMWindowOuter* aWindow,
nsIContent* aStartSelection,
nsIContent* aEndSelection,
nsIContent** aFocusedContent)
{
*aFocusedContent = nullptr;
nsCOMPtr<nsIContent> testContent = aStartSelection;
nsCOMPtr<nsIContent> nextTestContent = aEndSelection;
nsCOMPtr<nsIContent> currentFocus = aWindow->GetFocusedNode();
// We now have the correct start node in selectionContent!
// Search for focusable elements, starting with selectionContent
// Method #1: Keep going up while we look - an ancestor might be focusable
// We could end the loop earlier, such as when we're no longer
// in the same frame, by comparing selectionContent->GetPrimaryFrame()
// with a variable holding the starting selectionContent
while (testContent) {
// Keep testing while selectionContent is equal to something,
// eventually we'll run out of ancestors
nsCOMPtr<nsIURI> uri;
if (testContent == currentFocus ||
testContent->IsLink(getter_AddRefs(uri))) {
testContent.forget(aFocusedContent);
return;
}
// Get the parent
testContent = testContent->GetParent();
if (!testContent) {
// We run this loop again, checking the ancestor chain of the selection's end point
testContent = nextTestContent;
nextTestContent = nullptr;
}
}
// We couldn't find an anchor that was an ancestor of the selection start
// Method #2: look for anchor in selection's primary range (depth first search)
// Turn into nodes so that we can use GetNextSibling() and GetFirstChild()
nsCOMPtr<nsIDOMNode> selectionNode(do_QueryInterface(aStartSelection));
nsCOMPtr<nsIDOMNode> endSelectionNode(do_QueryInterface(aEndSelection));
nsCOMPtr<nsIDOMNode> testNode;
do {
testContent = do_QueryInterface(selectionNode);
// We're looking for any focusable link that could be part of the
// main document's selection.
nsCOMPtr<nsIURI> uri;
if (testContent == currentFocus ||
testContent->IsLink(getter_AddRefs(uri))) {
testContent.forget(aFocusedContent);
return;
}
selectionNode->GetFirstChild(getter_AddRefs(testNode));
if (testNode) {
selectionNode = testNode;
continue;
}
if (selectionNode == endSelectionNode)
break;
selectionNode->GetNextSibling(getter_AddRefs(testNode));
if (testNode) {
selectionNode = testNode;
continue;
}
do {
selectionNode->GetParentNode(getter_AddRefs(testNode));
if (!testNode || testNode == endSelectionNode) {
selectionNode = nullptr;
break;
}
testNode->GetNextSibling(getter_AddRefs(selectionNode));
if (selectionNode)
break;
selectionNode = testNode;
} while (true);
}
while (selectionNode && selectionNode != endSelectionNode);
}
class PointerUnlocker : public Runnable
{
public:
PointerUnlocker()
{
MOZ_ASSERT(!PointerUnlocker::sActiveUnlocker);
PointerUnlocker::sActiveUnlocker = this;
}
~PointerUnlocker()
{
if (PointerUnlocker::sActiveUnlocker == this) {
PointerUnlocker::sActiveUnlocker = nullptr;
}
}
NS_IMETHOD Run() override
{
if (PointerUnlocker::sActiveUnlocker == this) {
PointerUnlocker::sActiveUnlocker = nullptr;
}
NS_ENSURE_STATE(nsFocusManager::GetFocusManager());
nsPIDOMWindowOuter* focused =
nsFocusManager::GetFocusManager()->GetFocusedWindow();
nsCOMPtr<nsIDocument> pointerLockedDoc =
do_QueryReferent(EventStateManager::sPointerLockedDoc);
if (pointerLockedDoc &&
!nsContentUtils::IsInPointerLockContext(focused)) {
nsIDocument::UnlockPointer();
}
return NS_OK;
}
static PointerUnlocker* sActiveUnlocker;
};
PointerUnlocker*
PointerUnlocker::sActiveUnlocker = nullptr;
void
nsFocusManager::SetFocusedWindowInternal(nsPIDOMWindowOuter* aWindow)
{
if (!PointerUnlocker::sActiveUnlocker &&
nsContentUtils::IsInPointerLockContext(mFocusedWindow) &&
!nsContentUtils::IsInPointerLockContext(aWindow)) {
nsCOMPtr<nsIRunnable> runnable = new PointerUnlocker();
NS_DispatchToCurrentThread(runnable);
}
mFocusedWindow = aWindow;
}
void
nsFocusManager::MarkUncollectableForCCGeneration(uint32_t aGeneration)
{
if (!sInstance) {
return;
}
if (sInstance->mActiveWindow) {
sInstance->mActiveWindow->
MarkUncollectableForCCGeneration(aGeneration);
}
if (sInstance->mFocusedWindow) {
sInstance->mFocusedWindow->
MarkUncollectableForCCGeneration(aGeneration);
}
if (sInstance->mWindowBeingLowered) {
sInstance->mWindowBeingLowered->
MarkUncollectableForCCGeneration(aGeneration);
}
if (sInstance->mFocusedContent) {
sInstance->mFocusedContent->OwnerDoc()->
MarkUncollectableForCCGeneration(aGeneration);
}
if (sInstance->mFirstBlurEvent) {
sInstance->mFirstBlurEvent->OwnerDoc()->
MarkUncollectableForCCGeneration(aGeneration);
}
if (sInstance->mFirstFocusEvent) {
sInstance->mFirstFocusEvent->OwnerDoc()->
MarkUncollectableForCCGeneration(aGeneration);
}
if (sInstance->mMouseButtonEventHandlingDocument) {
sInstance->mMouseButtonEventHandlingDocument->
MarkUncollectableForCCGeneration(aGeneration);
}
}
nsresult
NS_NewFocusManager(nsIFocusManager** aResult)
{
NS_IF_ADDREF(*aResult = nsFocusManager::GetFocusManager());
return NS_OK;
}
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