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gecko-dev/dom/base/nsFocusManager.h

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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/. */
#ifndef nsFocusManager_h___
#define nsFocusManager_h___
#include "nsCycleCollectionParticipant.h"
#include "nsIContent.h"
#include "mozilla/dom/Document.h"
#include "nsIFocusManager.h"
#include "nsIObserver.h"
#include "nsWeakReference.h"
#include "mozilla/Attributes.h"
#include "mozilla/RefPtr.h"
#include "mozilla/StaticPtr.h"
#define FOCUSMANAGER_CONTRACTID "@mozilla.org/focus-manager;1"
class nsIContent;
class nsPIDOMWindowOuter;
namespace mozilla {
class PresShell;
namespace dom {
class Element;
struct FocusOptions;
class BrowserParent;
class ContentChild;
class ContentParent;
} // namespace dom
} // namespace mozilla
struct nsDelayedBlurOrFocusEvent;
/**
* The focus manager keeps track of where the focus is, that is, the node
* which receives key events.
*/
class nsFocusManager final : public nsIFocusManager,
public nsIObserver,
public nsSupportsWeakReference {
using InputContextAction = mozilla::widget::InputContextAction;
using Document = mozilla::dom::Document;
friend class mozilla::dom::ContentChild;
friend class mozilla::dom::ContentParent;
public:
NS_DECL_CYCLE_COLLECTION_CLASS_AMBIGUOUS(nsFocusManager, nsIFocusManager)
NS_DECL_CYCLE_COLLECTING_ISUPPORTS
NS_DECL_NSIOBSERVER
NS_DECL_NSIFOCUSMANAGER
// called to initialize and stop the focus manager at startup and shutdown
static nsresult Init();
static void Shutdown();
// Simple helper to call SetFocusedWindow on the instance.
//
// This raises the window and switches to the tab as needed.
MOZ_CAN_RUN_SCRIPT static void FocusWindow(
nsPIDOMWindowOuter* aWindow, mozilla::dom::CallerType aCallerType);
MOZ_CAN_RUN_SCRIPT_BOUNDARY static void PrefChanged(const char* aPref,
void* aSelf);
MOZ_CAN_RUN_SCRIPT void PrefChanged(const char* aPref);
/**
* Retrieve the single focus manager.
*/
static nsFocusManager* GetFocusManager() { return sInstance; }
/**
* A faster version of nsIFocusManager::GetFocusedElement, returning a
* raw Element pointer (instead of having AddRef-ed Element
* pointer filled in to an out-parameter).
*/
mozilla::dom::Element* GetFocusedElement() { return mFocusedElement; }
static mozilla::dom::Element* GetFocusedElementStatic() {
return sInstance ? sInstance->GetFocusedElement() : nullptr;
}
/**
* Returns true if aContent currently has focus.
*/
bool IsFocused(nsIContent* aContent);
/**
* Returns true if test mode is enabled.
*/
bool IsTestMode();
/**
* Return a focused window. Version of nsIFocusManager::GetFocusedWindow.
*/
nsPIDOMWindowOuter* GetFocusedWindow() const { return mFocusedWindow; }
/**
* In the chrome process, retrieves the BrowsingContext corresponding
* to GetFocusedWindow(). In a content process, retrieves the
* focused BrowsingContext, which may not belong to this process.
*/
mozilla::dom::BrowsingContext* GetFocusedBrowsingContext() const {
if (XRE_IsParentProcess()) {
if (mFocusedWindow) {
return mFocusedWindow->GetBrowsingContext();
}
return nullptr;
}
return mFocusedBrowsingContextInContent;
}
/**
* Returns whether the given browsing context is in the active window.
*/
bool IsInActiveWindow(mozilla::dom::BrowsingContext*) const;
/**
* Return an active window. Version of nsIFocusManager::GetActiveWindow.
*/
nsPIDOMWindowOuter* GetActiveWindow() const { return mActiveWindow; }
/**
* In the chrome process, retrieves the BrowsingContext corresponding
* to GetActiveWindow(). In a content process, retrieves the
* BrowsingContext of the top-level Web content in the active tab if
* in the same process as the caller or nullptr otherwise.
*/
mozilla::dom::BrowsingContext* GetActiveBrowsingContext() const {
if (XRE_IsParentProcess()) {
if (mActiveWindow) {
return mActiveWindow->GetBrowsingContext();
}
return nullptr;
}
return mActiveBrowsingContextInContent;
}
/**
* Called when content has been removed.
*/
MOZ_CAN_RUN_SCRIPT nsresult ContentRemoved(Document* aDocument,
nsIContent* aContent);
void NeedsFlushBeforeEventHandling(mozilla::dom::Element* aElement) {
if (mFocusedElement == aElement) {
mEventHandlingNeedsFlush = true;
}
}
bool CanSkipFocus(nsIContent* aContent);
MOZ_CAN_RUN_SCRIPT void FlushBeforeEventHandlingIfNeeded(
nsIContent* aContent) {
if (mEventHandlingNeedsFlush) {
nsCOMPtr<Document> doc = aContent->GetComposedDoc();
if (doc) {
mEventHandlingNeedsFlush = false;
doc->FlushPendingNotifications(mozilla::FlushType::Layout);
}
}
}
/**
* Update the caret with current mode (whether in caret browsing mode or not).
*/
MOZ_CAN_RUN_SCRIPT void UpdateCaretForCaretBrowsingMode();
/** @see nsIFocusManager.getLastFocusMethod() */
uint32_t GetLastFocusMethod(nsPIDOMWindowOuter*) const;
/**
* Returns the content node that would be focused if aWindow was in an
* active window. This will traverse down the frame hierarchy, starting at
* the given window aWindow. Sets aFocusedWindow to the window with the
* document containing aFocusedContent. If no element is focused,
* aFocusedWindow may be still be set -- this means that the document is
* focused but no element within it is focused.
*
* aWindow, aFocusIsOutOfProcess, aFocusedWindow must all be non-null.
*/
enum SearchRange {
// Return focused content in aWindow. So, aFocusedWindow is always aWindow.
eOnlyCurrentWindow,
// Return focused content in aWindow or one of all sub windows.
eIncludeAllDescendants,
// Return focused content in aWindow or one of visible sub windows.
eIncludeVisibleDescendants,
};
static mozilla::dom::Element* GetFocusedDescendant(
nsPIDOMWindowOuter* aWindow, SearchRange aSearchRange,
nsPIDOMWindowOuter** aFocusedWindow);
/**
* Helper function for MoveFocus which determines the next element
* to move the focus to and returns it in aNextContent.
*
* aWindow is the window to adjust the focus within, and aStart is
* the element to start navigation from. For tab key navigation,
* this should be the currently focused element.
*
* aType is the type passed to MoveFocus. If aNoParentTraversal is set,
* navigation is not done to parent documents and iteration returns to the
* beginning (or end) of the starting document.
*
* aNavigateByKey to move focus by keyboard as a side effect of computing the
* next target.
*/
MOZ_CAN_RUN_SCRIPT nsresult DetermineElementToMoveFocus(
nsPIDOMWindowOuter* aWindow, nsIContent* aStart, int32_t aType,
bool aNoParentTraversal, bool aNavigateByKey, nsIContent** aNextContent);
/**
* Setter for focusedWindow with CallerType
*/
MOZ_CAN_RUN_SCRIPT nsresult SetFocusedWindowWithCallerType(
mozIDOMWindowProxy* aWindowToFocus, mozilla::dom::CallerType aCallerType);
/**
* Given an element, which must be the focused element, activate the remote
* frame it embeds, if any.
*/
void ActivateRemoteFrameIfNeeded(mozilla::dom::Element&, uint64_t aActionId);
/**
* Raises the top-level window aWindow at the widget level.
*/
MOZ_CAN_RUN_SCRIPT void RaiseWindow(nsPIDOMWindowOuter* aWindow,
mozilla::dom::CallerType aCallerType,
uint64_t aActionId);
/**
* Called when a window has been raised.
*/
MOZ_CAN_RUN_SCRIPT void WindowRaised(mozIDOMWindowProxy* aWindow,
uint64_t aActionId);
/**
* Called when a window has been lowered.
*/
MOZ_CAN_RUN_SCRIPT void WindowLowered(mozIDOMWindowProxy* aWindow,
uint64_t aActionId);
/**
* Called when a new document in a window is shown.
*
* If aNeedsFocus is true, then focus events are expected to be fired on the
* window if this window is in the focused window chain.
*/
MOZ_CAN_RUN_SCRIPT void WindowShown(mozIDOMWindowProxy* aWindow,
bool aNeedsFocus);
/**
* Called when a document in a window has been hidden or otherwise can no
* longer accept focus.
*/
MOZ_CAN_RUN_SCRIPT void WindowHidden(mozIDOMWindowProxy* aWindow,
uint64_t aActionId);
/**
* Fire any events that have been delayed due to synchronized actions.
*/
MOZ_CAN_RUN_SCRIPT void FireDelayedEvents(Document* aDocument);
void WasNuked(nsPIDOMWindowOuter* aWindow);
static uint32_t ProgrammaticFocusFlags(
const mozilla::dom::FocusOptions& aOptions);
/**
* Returns an InputContextAction cause for aFlags.
*/
static InputContextAction::Cause GetFocusMoveActionCause(uint32_t aFlags);
/**
* Notify of re-focus to same element.
*
* aElement is focused element.
*/
MOZ_CAN_RUN_SCRIPT void NotifyOfReFocus(mozilla::dom::Element& aElement);
static void MarkUncollectableForCCGeneration(uint32_t aGeneration);
struct BlurredElementInfo {
const mozilla::OwningNonNull<mozilla::dom::Element> mElement;
explicit BlurredElementInfo(mozilla::dom::Element&);
~BlurredElementInfo();
};
protected:
nsFocusManager();
~nsFocusManager();
/**
* Ensure that the widget associated with the currently focused window is
* focused at the widget level.
*/
void EnsureCurrentWidgetFocused(mozilla::dom::CallerType aCallerType);
/**
* Activate or deactivate the window and send the activate/deactivate events.
*/
void ActivateOrDeactivate(nsPIDOMWindowOuter* aWindow, bool aActive);
/**
* Blur whatever is currently focused and focus aNewContent. aFlags is a
* bitmask of the flags defined in nsIFocusManager. If aFocusChanged is
* true, then the focus has actually shifted and the caret position will be
* updated to the new focus, aNewContent will be scrolled into view (unless
* a flag disables this) and the focus method for the window will be updated.
* If aAdjustWidget is false, don't change the widget focus state.
*
* All actual focus changes must use this method to do so. (as opposed
* to those that update the focus in an inactive window for instance).
*
* Returns Nothing() if we end up not trying to focus the element,
* otherwise returns the generated action id.
*/
MOZ_CAN_RUN_SCRIPT mozilla::Maybe<uint64_t> SetFocusInner(
mozilla::dom::Element* aNewContent, int32_t aFlags, bool aFocusChanged,
bool aAdjustWidget);
/**
* Returns true if aPossibleAncestor is the same as aWindow or an
* ancestor of aWindow.
*/
bool IsSameOrAncestor(nsPIDOMWindowOuter* aPossibleAncestor,
nsPIDOMWindowOuter* aWindow) const;
bool IsSameOrAncestor(nsPIDOMWindowOuter* aPossibleAncestor,
mozilla::dom::BrowsingContext* aContext) const;
bool IsSameOrAncestor(mozilla::dom::BrowsingContext* aPossibleAncestor,
nsPIDOMWindowOuter* aWindow) const;
public:
bool IsSameOrAncestor(mozilla::dom::BrowsingContext* aPossibleAncestor,
mozilla::dom::BrowsingContext* aContext) const;
protected:
/**
* Returns the window that is the lowest common ancestor of both aWindow
* and aContext, or null if they share no common ancestor.
*/
mozilla::dom::BrowsingContext* GetCommonAncestor(
nsPIDOMWindowOuter* aWindow, mozilla::dom::BrowsingContext* aContext);
/**
* When aBrowsingContext is focused, adjust the ancestors of aBrowsingContext
* so that they also have their corresponding frames focused. Thus, one can
* start at the active top-level window and navigate down the currently
* focused elements for each frame in the tree to get to aBrowsingContext.
*/
MOZ_CAN_RUN_SCRIPT bool AdjustInProcessWindowFocus(
mozilla::dom::BrowsingContext* aBrowsingContext, bool aCheckPermission,
bool aIsVisible, uint64_t aActionId);
MOZ_CAN_RUN_SCRIPT void AdjustWindowFocus(
mozilla::dom::BrowsingContext* aBrowsingContext, bool aCheckPermission,
bool aIsVisible, uint64_t aActionId);
/**
* Returns true if aWindow is visible.
*/
bool IsWindowVisible(nsPIDOMWindowOuter* aWindow);
/**
* Returns true if aContent is a root element and not focusable.
* I.e., even if aContent is editable root element, this returns true when
* the document is in designMode.
*
* @param aContent must not be null and must be in a document.
*/
bool IsNonFocusableRoot(nsIContent* aContent);
/**
* First flushes the pending notifications to ensure the PresShell and frames
* are updated.
* Checks and returns aElement if it may be focused, another element node if
* the focus should be retargeted at another node, or null if the node
* cannot be focused. aFlags are the flags passed to SetFocus and similar
* methods.
*
* An element is focusable if it is in a document, the document isn't in
* print preview mode and the element has an nsIFrame where the
* IsFocusable method returns true. For <area> elements, there is no
* frame, so only the IsFocusable method on the content node must be
* true.
*/
MOZ_CAN_RUN_SCRIPT mozilla::dom::Element* FlushAndCheckIfFocusable(
mozilla::dom::Element* aElement, uint32_t aFlags);
/**
* Blurs the currently focused element. Returns false if another element was
* focused as a result. This would mean that the caller should not proceed
* with a pending call to Focus. Normally, true would be returned.
*
* The currently focused element within aBrowsingContextToClear will be
* cleared. aBrowsingContextToClear may be null, which means that no window is
* cleared. This will be the case, for example, when lowering a window, as we
* want to fire a blur, but not actually change what element would be focused,
* so that the same element will be focused again when the window is raised.
*
* aAncestorBrowsingContextToFocus should be set to the common ancestor of the
* window that is being blurred and the window that is going to focused, when
* switching focus to a sibling window.
*
* aIsLeavingDocument should be set to true if the document/window is being
* blurred as well. Document/window blur events will be fired. It should be
* false if an element is the same document is about to be focused.
*
* If aAdjustWidget is false, don't change the widget focus state.
*/
MOZ_CAN_RUN_SCRIPT bool Blur(
mozilla::dom::BrowsingContext* aBrowsingContextToClear,
mozilla::dom::BrowsingContext* aAncestorBrowsingContextToFocus,
bool aIsLeavingDocument, bool aAdjustWidget, bool aRemainActive,
uint64_t aActionId, mozilla::dom::Element* aElementToFocus = nullptr);
MOZ_CAN_RUN_SCRIPT void BlurFromOtherProcess(
mozilla::dom::BrowsingContext* aFocusedBrowsingContext,
mozilla::dom::BrowsingContext* aBrowsingContextToClear,
mozilla::dom::BrowsingContext* aAncestorBrowsingContextToFocus,
bool aIsLeavingDocument, bool aAdjustWidget, uint64_t aActionId);
MOZ_CAN_RUN_SCRIPT bool BlurImpl(
mozilla::dom::BrowsingContext* aBrowsingContextToClear,
mozilla::dom::BrowsingContext* aAncestorBrowsingContextToFocus,
bool aIsLeavingDocument, bool aAdjustWidget, bool aRemainActive,
mozilla::dom::Element* aElementToFocus, uint64_t aActionId);
/**
* Focus an element in the active window and child frame.
*
* aWindow is the window containing the element aContent to focus.
*
* aFlags is the flags passed to the various focus methods in
* nsIFocusManager.
*
* aIsNewDocument should be true if a new document is being focused.
* Document/window focus events will be fired.
*
* aFocusChanged should be true if a new content node is being focused, so
* the focused content will be scrolled into view and the caret position
* will be updated. If false is passed, then a window is simply being
* refocused, for instance, due to a window being raised, or a tab is being
* switched to.
*
* If aFocusChanged is true, then the focus has moved to a new location.
* Otherwise, the focus is just being updated because the window was
* raised.
*
* aWindowRaised should be true if the window is being raised. In this case,
* command updaters will not be called.
*
* If aAdjustWidget is false, don't change the widget focus state.
*/
MOZ_CAN_RUN_SCRIPT void Focus(
nsPIDOMWindowOuter* aWindow, mozilla::dom::Element* aContent,
uint32_t aFlags, bool aIsNewDocument, bool aFocusChanged,
bool aWindowRaised, bool aAdjustWidget, uint64_t aActionId,
const mozilla::Maybe<BlurredElementInfo>& = mozilla::Nothing());
/**
* Send a focus or blur event at aTarget. It may be added to the delayed
* event queue if the document is suppressing events.
*
* aEventMessage should be either eFocus or eBlur.
*
* aWindowRaised should only be true if called from WindowRaised.
*/
MOZ_CAN_RUN_SCRIPT void SendFocusOrBlurEvent(
mozilla::EventMessage aEventMessage, mozilla::PresShell* aPresShell,
Document* aDocument, mozilla::dom::EventTarget* aTarget,
bool aWindowRaised, bool aIsRefocus = false,
mozilla::dom::EventTarget* aRelatedTarget = nullptr);
/**
* Fire a focus or blur event at aTarget.
*
* aEventMessage should be either eFocus or eBlur.
* For blur events, aFocusMethod should normally be non-zero.
*
* aWindowRaised should only be true if called from WindowRaised.
*/
MOZ_CAN_RUN_SCRIPT void FireFocusOrBlurEvent(
mozilla::EventMessage aEventMessage, mozilla::PresShell* aPresShell,
mozilla::dom::EventTarget* aTarget, bool aWindowRaised,
bool aIsRefocus = false,
mozilla::dom::EventTarget* aRelatedTarget = nullptr);
/**
* Fire a focusin or focusout event
*
* aEventMessage should be either eFocusIn or eFocusOut.
*
* aTarget is the content the event will fire on (the object that gained
* focus for focusin, the object blurred for focusout).
*
* aCurrentFocusedWindow is the window focused before the focus/blur event
* was fired.
*
* aCurrentFocusedContent is the content focused before the focus/blur event
* was fired.
*
* aRelatedTarget is the content related to the event (the object
* losing focus for focusin, the object getting focus for focusout).
*/
MOZ_CAN_RUN_SCRIPT void FireFocusInOrOutEvent(
mozilla::EventMessage aEventMessage, mozilla::PresShell* aPresShell,
mozilla::dom::EventTarget* aTarget,
nsPIDOMWindowOuter* aCurrentFocusedWindow,
nsIContent* aCurrentFocusedContent,
mozilla::dom::EventTarget* aRelatedTarget = nullptr);
/**
* Scrolls aContent into view unless the FLAG_NOSCROLL flag is set.
*/
MOZ_CAN_RUN_SCRIPT
void ScrollIntoView(mozilla::PresShell* aPresShell, nsIContent* aContent,
uint32_t aFlags);
/**
* Updates the caret positon and visibility to match the focus.
*
* aMoveCaretToFocus should be true to move the caret to aContent.
*
* aUpdateVisibility should be true to update whether the caret is
* visible or not.
*/
MOZ_CAN_RUN_SCRIPT void UpdateCaret(bool aMoveCaretToFocus,
bool aUpdateVisibility,
nsIContent* aContent);
/**
* Helper method to move the caret to the focused element aContent.
*/
MOZ_CAN_RUN_SCRIPT void MoveCaretToFocus(mozilla::PresShell* aPresShell,
nsIContent* aContent);
/**
* Makes the caret visible or not, depending on aVisible.
*/
nsresult SetCaretVisible(mozilla::PresShell* aPresShell, bool aVisible,
nsIContent* aContent);
// the remaining functions are used for tab key and document-navigation
/**
* Retrieves the start and end points of the current selection for
* aDocument and stores them in aStartContent and aEndContent.
*/
nsresult GetSelectionLocation(Document* aDocument,
mozilla::PresShell* aPresShell,
nsIContent** aStartContent,
nsIContent** aEndContent);
/**
* Retrieve the next tabbable element in scope owned by aOwner, using
* focusability and tabindex to determine the tab order.
*
* aOwner is the owner of scope to search in.
*
* aStartContent is the starting point for this call of this method.
*
* aOriginalStartContent is the initial starting point for sequential
* navigation.
*
* aForward should be true for forward navigation or false for backward
* navigation.
*
* aCurrentTabIndex is the current tabindex.
*
* aIgnoreTabIndex to ignore the current tabindex and find the element
* irrespective or the tab index.
*
* aForDocumentNavigation informs whether we're navigating only through
* documents.
*
* aSkipOwner to skip owner while searching. The flag is set when caller is
* |GetNextTabbableContent| in order to let caller handle owner.
*
* NOTE:
* Consider the method searches downwards in flattened subtree
* rooted at aOwner.
*/
MOZ_CAN_RUN_SCRIPT nsIContent* GetNextTabbableContentInScope(
nsIContent* aOwner, nsIContent* aStartContent,
nsIContent* aOriginalStartContent, bool aForward,
int32_t aCurrentTabIndex, bool aIgnoreTabIndex,
bool aForDocumentNavigation, bool aNavigateByKey, bool aSkipOwner);
/**
* Retrieve the next tabbable element in scope including aStartContent
* and the scope's ancestor scopes, using focusability and tabindex to
* determine the tab order.
*
* aStartOwner is the scope owner of the aStartContent.
*
* aStartContent an in/out paremeter. It as input is the starting point
* for this call of this method; as output it is the shadow host in
* light DOM if the next tabbable element is not found in shadow DOM,
* in order to continue searching in light DOM.
*
* aOriginalStartContent is the initial starting point for sequential
* navigation.
*
* aForward should be true for forward navigation or false for backward
* navigation.
*
* aCurrentTabIndex returns tab index of shadow host in light DOM if the
* next tabbable element is not found in shadow DOM, in order to continue
* searching in light DOM.
*
* aIgnoreTabIndex to ignore the current tabindex and find the element
* irrespective or the tab index.
*
* aForDocumentNavigation informs whether we're navigating only through
* documents.
*
* aNavigateByKey to move focus by keyboard as a side effect of computing the
* next target.
*
* NOTE:
* Consider the method searches upwards in all shadow host- or slot-rooted
* flattened subtrees that contains aStartContent as non-root, except
* the flattened subtree rooted at shadow host in light DOM.
*/
MOZ_CAN_RUN_SCRIPT nsIContent* GetNextTabbableContentInAncestorScopes(
nsIContent* aStartOwner, nsCOMPtr<nsIContent>& aStartContent /* inout */,
nsIContent* aOriginalStartContent, bool aForward,
int32_t* aCurrentTabIndex, bool* aIgnoreTabIndex,
bool aForDocumentNavigation, bool aNavigateByKey);
/**
* Retrieve the next tabbable element within a document, using focusability
* and tabindex to determine the tab order. The element is returned in
* aResultContent.
*
* aRootContent is the root node -- nodes above this will not be examined.
* Typically this will be the root node of a document, but could also be
* a popup node.
*
* aOriginalStartContent is the content which was originally the starting
* node, in the case of recursive or looping calls.
*
* aStartContent is the starting point for this call of this method.
* If aStartContent doesn't have visual representation, the next content
* object, which does have a primary frame, will be used as a start.
* If that content object is focusable, the method may return it.
*
* aForward should be true for forward navigation or false for backward
* navigation.
*
* aCurrentTabIndex is the current tabindex.
*
* aIgnoreTabIndex to ignore the current tabindex and find the element
* irrespective or the tab index. This will be true when a selection is
* active, since we just want to focus the next element in tree order
* from where the selection is. Similarly, if the starting element isn't
* focusable, since it doesn't really have a defined tab index.
*
* aNavigateByKey to move focus by keyboard as a side effect of computing the
* next target.
*/
MOZ_CAN_RUN_SCRIPT nsresult GetNextTabbableContent(
mozilla::PresShell* aPresShell, nsIContent* aRootContent,
nsIContent* aOriginalStartContent, nsIContent* aStartContent,
bool aForward, int32_t aCurrentTabIndex, bool aIgnoreTabIndex,
bool aForDocumentNavigation, bool aNavigateByKey,
nsIContent** aResultContent);
/**
* Get the next tabbable image map area and returns it.
*
* aForward should be true for forward navigation or false for backward
* navigation.
*
* aCurrentTabIndex is the current tabindex.
*
* aImageContent is the image.
*
* aStartContent is the current image map area.
*/
nsIContent* GetNextTabbableMapArea(bool aForward, int32_t aCurrentTabIndex,
mozilla::dom::Element* aImageContent,
nsIContent* aStartContent);
/**
* Return the next valid tabindex value after aCurrentTabIndex, if aForward
* is true, or the previous tabindex value if aForward is false. aParent is
* the node from which to start looking for tab indicies.
*/
int32_t GetNextTabIndex(nsIContent* aParent, int32_t aCurrentTabIndex,
bool aForward);
/**
* Focus the first focusable content within the document with a root node of
* aRootContent. For content documents, this will be aRootContent itself, but
* for chrome documents, this will locate the next focusable content.
*/
MOZ_CAN_RUN_SCRIPT nsresult FocusFirst(mozilla::dom::Element* aRootContent,
nsIContent** aNextContent);
/**
* Retrieves and returns the root node from aDocument to be focused. Will
* return null if the root node cannot be focused. There are several reasons
* for this:
*
* - if aForDocumentNavigation is false and aWindow is a chrome shell.
* - if aCheckVisibility is true and the aWindow is not visible.
* - if aDocument is a frameset document.
*/
mozilla::dom::Element* GetRootForFocus(nsPIDOMWindowOuter* aWindow,
Document* aDocument,
bool aForDocumentNavigation,
bool aCheckVisibility);
/**
* Retrieves and returns the root node as with GetRootForFocus but only if
* aContent is a frame with a valid child document.
*/
mozilla::dom::Element* GetRootForChildDocument(nsIContent* aContent);
/**
* Retreives a focusable element within the current selection of aWindow.
* Currently, this only detects links.
*
* This is used when MoveFocus is called with a type of MOVEFOCUS_CARET,
* which is used, for example, to focus links as the caret is moved over
* them.
*/
void GetFocusInSelection(nsPIDOMWindowOuter* aWindow,
nsIContent* aStartSelection,
nsIContent* aEndSelection,
nsIContent** aFocusedContent);
private:
// Notify that the focus state of aElement has changed. Note that we need to
// pass in whether the window should show a focus ring before the
// SetFocusedNode call on it happened when losing focus and after the
// SetFocusedNode call when gaining focus, which is why that information needs
// to be an explicit argument instead of just passing in the window and asking
// it whether it should show focus rings: in the losing focus case that
// information could be wrong.
//
// aShouldShowFocusRing is only relevant if aGettingFocus is true.
static void NotifyFocusStateChange(mozilla::dom::Element* aElement,
mozilla::dom::Element* aElementToFocus,
int32_t aFlags, bool aGettingFocus,
bool aShouldShowFocusRing);
void SetFocusedWindowInternal(nsPIDOMWindowOuter* aWindow, uint64_t aActionId,
bool aSyncBrowsingContext = true);
MOZ_CAN_RUN_SCRIPT bool TryDocumentNavigation(nsIContent* aCurrentContent,
bool* aCheckSubDocument,
nsIContent** aResultContent);
MOZ_CAN_RUN_SCRIPT bool TryToMoveFocusToSubDocument(
nsIContent* aCurrentContent, nsIContent* aOriginalStartContent,
bool aForward, bool aForDocumentNavigation, bool aNavigateByKey,
nsIContent** aResultContent);
// Sets the focused BrowsingContext and, if appropriate, syncs it to
// other processes.
void SetFocusedBrowsingContext(mozilla::dom::BrowsingContext* aContext,
uint64_t aActionId);
// Content-only
// Called when receiving an IPC message about another process setting
// the focused BrowsingContext.
void SetFocusedBrowsingContextFromOtherProcess(
mozilla::dom::BrowsingContext* aContext, uint64_t aActionId);
// Chrome-only
// When returning true, sets the chrome process notion of what
// BrowsingContext is focused in content. When returning false,
// ignores the attempt to set as out-of-sequence.
bool SetFocusedBrowsingContextInChrome(
mozilla::dom::BrowsingContext* aContext, uint64_t aActionId);
void InsertNewFocusActionId(uint64_t aActionId);
bool ProcessPendingActiveBrowsingContextActionId(uint64_t aActionId,
bool aSettingToNonNull);
bool ProcessPendingFocusedBrowsingContextActionId(uint64_t aActionId);
public:
// Chrome-only
// Gets the chrome process notion of what BrowsingContext is focused
// in content.
mozilla::dom::BrowsingContext* GetFocusedBrowsingContextInChrome();
// Chrome-only
// Notifies the focus manager that BrowsingContext::Detach was called
// on a BrowsingContext so that pointers to it can be forgotten.
void BrowsingContextDetached(mozilla::dom::BrowsingContext* aContext);
private:
// Content-only
// Sets the BrowsingContext corresponding to top-level Web content
// in the frontmost tab if focus is in Web content.
void SetActiveBrowsingContextInContent(
mozilla::dom::BrowsingContext* aContext, uint64_t aActionId);
// Content-only
// Receives notification of another process setting the top-level Web
// content as being in the frontmost tab with focus in Web content.
void SetActiveBrowsingContextFromOtherProcess(
mozilla::dom::BrowsingContext* aContext, uint64_t aActionId);
// Content-only
// Receives notification that another process determined that focus
// moved to chrome so a particular BrowsingContext is no longer the
// "active" one.
void UnsetActiveBrowsingContextFromOtherProcess(
mozilla::dom::BrowsingContext* aContext, uint64_t aActionId);
// Content-only
// Receives a notification from parent that this content process's
// attempt to set the active browsing context was late and the
// prevailing browsing context is instead the second argument of
// this method call. This should be ignored if the first argument
// doesn't match the latest action id associated with setting the
// active browsing context in this process, because in that case,
// this revision is late.
void ReviseActiveBrowsingContext(uint64_t aOldActionId,
mozilla::dom::BrowsingContext* aContext,
uint64_t aNewActionId);
// Receives a notification from parent that this content process's
// attempt to set the focused browsing context was late and the
// prevailing browsing context is instead the second argument of
// this method call. This should be ignored if the first argument
// doesn't match the latest action id associated with setting the
// active browsing context in this process, because in that case,
// this revision is late.
void ReviseFocusedBrowsingContext(uint64_t aOldActionId,
mozilla::dom::BrowsingContext* aContext,
uint64_t aNewActionId);
// Chrome-only
// Sets the chrome process notion of what content believes to be
// the top-level BrowsingContext in the frontmost tab when focus
// is in Web content.
// Returns true if set and false if ignored.
bool SetActiveBrowsingContextInChrome(mozilla::dom::BrowsingContext* aContext,
uint64_t aActionId);
public:
// Chrome-only
// Gets the chrome process notion of what content believes to be
// the top-level BrowsingContext in the frontmost tab when focus
// is in Web content.
mozilla::dom::BrowsingContext* GetActiveBrowsingContextInChrome();
uint64_t GetActionIdForActiveBrowsingContextInChrome() const;
uint64_t GetActionIdForFocusedBrowsingContextInChrome() const;
static uint64_t GenerateFocusActionId();
// This function works very similar to
// https://html.spec.whatwg.org/#get-the-focusable-area
static mozilla::dom::Element* GetTheFocusableArea(
mozilla::dom::Element* aTarget, uint32_t aFlags);
private:
// In the chrome process, the currently active and front-most top-most
// window. Not supposed to be used in a meaningful way in content
// processes. For legacy reasons, this exists as a separate field
// instead of being derived from mFocusedWindow when needed, because
// the defined relation that mActiveWindow is supposed to be the same
// as or ancestor of mFocusedWindow is temporarily broken when a
// window is being raised or lowered.
nsCOMPtr<nsPIDOMWindowOuter> mActiveWindow;
// In a content process, the BrowsingContext corresponding to top-level
// Web content in the active tab or nullptr if focus is not in a
// BrowsingContextGroup that this process participates in. Synced
// across processes in a BrowsingContextGroup. This field exists
// separately from mFocusedBrowsingContextInContent instead of being being
// derived from it, because for legacy reasons the relation
// mFocusedBrowsingContextInContent->Top() == mActiveBrowsingContextInContent
// is temporarily broken when a window is being raised or lowered.
// Not supposed to be used in a meaningful way in the chrome process.
RefPtr<mozilla::dom::BrowsingContext> mActiveBrowsingContextInContent;
// If this content process set mActiveBrowsingContextInContent, this
// field holds the corresponding actionId so that
// mActiveBrowsingContextInContent can be revised of the parent rejects
// the update. This field is used for accepting revisions only if nothing
// else has updated mActiveBrowsingContextInContent before the revision
// arrives.
uint64_t mActionIdForActiveBrowsingContextInContent;
uint64_t mActionIdForActiveBrowsingContextInChrome;
// If this content process set mFocusedBrowsingContextInContent, this
// field holds the corresponding actionId so that
// mFocusedBrowsingContextInContent can be revised of the parent rejects
// the update. This field is used for accepting revisions only if nothing
// else has updated mFocusedBrowsingContextInContent before the revision
// arrives.
uint64_t mActionIdForFocusedBrowsingContextInContent;
uint64_t mActionIdForFocusedBrowsingContextInChrome;
// Whether or not mActiveBrowsingContextInContent was set from another process
// or from this process.
bool mActiveBrowsingContextInContentSetFromOtherProcess;
// This is the chrome process notion of content's
// mActiveBrowsingContextInContent. Avoiding field reuse for different
// semantics in different process types to make it easier to catch bugs.
RefPtr<mozilla::dom::BrowsingContext> mActiveBrowsingContextInChrome;
// the child or top-level window that is currently focused. In the chrome
// process, when a window isn't being raised or lowered, this window will
// either be the same window as mActiveWindow or a descendant of it.
// Except during shutdown use SetFocusedWindowInternal to set mFocusedWindow!
nsCOMPtr<nsPIDOMWindowOuter> mFocusedWindow;
// The focused BrowsingContext if this is a chrome process and focus is
// in chrome or if this is a content process and focus is in Web content
// in this BrowsingContextGroup. nullptr otherwise.
// Except during shutdown, must be set via SetFocusedWindowInternal which
// calls SetFocusedBrowsingContext or if the value is coming in via IPC
// via SetFocusedBrowsingContextFromOtherProcess.
RefPtr<mozilla::dom::BrowsingContext> mFocusedBrowsingContextInContent;
// This is the chrome process notion of content's
// mFocusedBrowsingContextInContent. Avoiding field reuse for different
// semantics in different process types to make it easier to catch bugs.
RefPtr<mozilla::dom::BrowsingContext> mFocusedBrowsingContextInChrome;
// the currently focused content if in-process or the XUL browser in which
// Web content focus resides. Always inside mFocusedWindow. When a window
// isn't being raised or lowered, this is a cached copy of the
// mFocusedWindow's current content. This may be null if no content is
// focused.
RefPtr<mozilla::dom::Element> mFocusedElement;
// these fields store a content node temporarily while it is being focused
// or blurred to ensure that a recursive call doesn't refire the same event.
// They will always be cleared afterwards.
RefPtr<mozilla::dom::Element> mFirstBlurEvent;
RefPtr<mozilla::dom::Element> mFirstFocusEvent;
// keep track of a window while it is being lowered
nsCOMPtr<nsPIDOMWindowOuter> mWindowBeingLowered;
// synchronized actions cannot be interrupted with events, so queue these up
// and fire them later.
nsTArray<nsDelayedBlurOrFocusEvent> mDelayedBlurFocusEvents;
// Array of focus action ids for which we haven't seen an active browsing
// context set yet. As set is allowed to overwrite an unset. Therefore,
// an unset removes earlier ids but not the matching id. A set removes
// earlier ids and the matching id.
//
// Conceptually, active browsing context shouldn't have to exist as a
// field, because it should be possible to always derive it from the
// focused browsing context. Unfortunately, for legacy reasons, this
// is not the case while a window is being raised or lowered.
//
// Conceptually, it should be possible for the parent to manage the
// active browsing context. Unfortunately, for legacy reasons, the
// code for setting the active browsing context needs to reside in
// the content process to retain the existing and test-passing code
// flow.
//
// This, obviously, raises the issue of content processes racing to
// set the active browsing context. In particular, there is a pattern
// that the parent initiates actions that cause multiple content
// processes to mutate the active browsing context at almost the
// same time. When two native browser windows change order, the
// lowering isn't distinguished from the case of lowering the
// entire app. For this reason, the owner of the previous active
// browsing context tries to unset it and at almost the same time
// the another content process sets a new active browsing context.
// If the IPC messages for these unset and set actions were to
// arrive in the wrong order, this could get in the wrong state.
//
// To address this issue, the parent manages an authortative order
// of attempts to (un)set the active browsing context using the
// array mPendingActiveBrowsingContextActions.
//
// A process reserves a slot in the order by calling
// GenerateFocusActionId(). Per one call to GenerateFocusActionId(),
// there may be at most one action to set the active browsing context
// to a new value. There may be logically prior attempts to unset it
// (i.e. set it to nullptr). That is, if there are both attempts to
// unset and set the active browsing context with the same action id,
// the attempt to set to a non-null value wins.
//
// The completion of an action from reserting the slot in the order
// and actually performing the setting of the active browsing context
// may span multiple processes and IPC messages.
//
// The at-most-once property is not asserted, because the process
// claiming the position in the order and the process setting the
// active browsing context with that actionId may be different, and
// the act of using an actionId to set the active browsing context
// is used to delete stale items from the array to avoid excessive
// growth of the array.
nsTArray<uint64_t> mPendingActiveBrowsingContextActions;
// Like mPendingActiveBrowsingContextActions but for the focused
// browsing context.
nsTArray<uint64_t> mPendingFocusedBrowsingContextActions;
// If set to true, layout of the document of the event target should be
// flushed before handling focus depending events.
bool mEventHandlingNeedsFlush;
static bool sTestMode;
// Process-specific counter for maintaining the prosess-specific
// uniqueness of actionIds.
static uint64_t sFocusActionCounter;
// the single focus manager
static mozilla::StaticRefPtr<nsFocusManager> sInstance;
};
nsresult NS_NewFocusManager(nsIFocusManager** aResult);
#endif
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