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gecko-dev/widget/nsBaseDragService.cpp
Sean Feng 877a44bc34 Bug 1906388 - Ensure dragend uses the same target as dragstart r=masayuki,dom-core 
Since this issue is too obvious, I am not even sure I am doing the right
thing. This looks like it should be discovered years ago....

As far as I can tell from the spec, dragstart and dragend use the same node
as the target, but it's not always the same node in Firefox.

Differential Revision: https://phabricator.services.mozilla.com/D215827
2024-07-16 14:53:18 +00:00

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/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* 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 "nsBaseDragService.h"
#include "nsITransferable.h"
#include "nsArrayUtils.h"
#include "nsITransferable.h"
#include "nsSize.h"
#include "nsXPCOM.h"
#include "nsCOMPtr.h"
#include "nsIInterfaceRequestorUtils.h"
#include "nsIFrame.h"
#include "nsFrameLoaderOwner.h"
#include "nsIContent.h"
#include "nsViewManager.h"
#include "nsINode.h"
#include "nsPresContext.h"
#include "nsIImageLoadingContent.h"
#include "imgIContainer.h"
#include "imgIRequest.h"
#include "ImageRegion.h"
#include "nsQueryObject.h"
#include "nsRegion.h"
#include "nsXULPopupManager.h"
#include "nsMenuPopupFrame.h"
#include "nsTreeBodyFrame.h"
#include "mozilla/MouseEvents.h"
#include "mozilla/Preferences.h"
#include "mozilla/PresShell.h"
#include "mozilla/ProfilerLabels.h"
#include "mozilla/SVGImageContext.h"
#include "mozilla/TextControlElement.h"
#include "mozilla/Unused.h"
#include "mozilla/ViewportUtils.h"
#include "mozilla/dom/BindingDeclarations.h"
#include "mozilla/dom/BrowserParent.h"
#include "mozilla/dom/ContentParent.h"
#include "mozilla/dom/DataTransferItemList.h"
#include "mozilla/dom/DataTransfer.h"
#include "mozilla/dom/Document.h"
#include "mozilla/dom/DocumentInlines.h"
#include "mozilla/dom/DragEvent.h"
#include "mozilla/dom/Selection.h"
#include "mozilla/gfx/2D.h"
#include "nsFrameLoader.h"
#include "nsIMutableArray.h"
#include "gfxContext.h"
#include "gfxPlatform.h"
#include "nscore.h"
#include "MockDragServiceController.h"
#include <algorithm>
using namespace mozilla;
using namespace mozilla::dom;
using namespace mozilla::gfx;
using namespace mozilla::image;
LazyLogModule sWidgetDragServiceLog("WidgetDragService");
#define DRAGIMAGES_PREF "nglayout.enable_drag_images"
// TODO: Temporary hack to share drag session suppression level.
// Removed later in this patch series.
uint32_t GetSuppressLevel() {
nsCOMPtr<nsIDragService> svc =
do_GetService("@mozilla.org/widget/dragservice;1");
NS_ENSURE_TRUE(svc, 0);
return static_cast<nsBaseDragService*>(svc.get())->GetSuppressLevel();
}
nsBaseDragService::nsBaseDragService() = default;
nsBaseDragService::~nsBaseDragService() = default;
nsBaseDragSession::nsBaseDragSession() { TakeSessionBrowserListFromService(); }
nsBaseDragSession::~nsBaseDragSession() = default;
NS_IMPL_ISUPPORTS(nsBaseDragService, nsIDragService)
NS_IMPL_ISUPPORTS(nsBaseDragSession, nsIDragSession)
NS_IMETHODIMP nsBaseDragService::GetIsMockService(bool* aRet) {
*aRet = false;
return NS_OK;
}
//---------------------------------------------------------
NS_IMETHODIMP
nsBaseDragSession::SetCanDrop(bool aCanDrop) {
mCanDrop = aCanDrop;
return NS_OK;
}
//---------------------------------------------------------
NS_IMETHODIMP
nsBaseDragSession::GetCanDrop(bool* aCanDrop) {
*aCanDrop = mCanDrop;
return NS_OK;
}
//---------------------------------------------------------
NS_IMETHODIMP
nsBaseDragSession::SetOnlyChromeDrop(bool aOnlyChrome) {
mOnlyChromeDrop = aOnlyChrome;
return NS_OK;
}
//---------------------------------------------------------
NS_IMETHODIMP
nsBaseDragSession::GetOnlyChromeDrop(bool* aOnlyChrome) {
*aOnlyChrome = mOnlyChromeDrop;
return NS_OK;
}
//---------------------------------------------------------
NS_IMETHODIMP
nsBaseDragSession::SetDragAction(uint32_t anAction) {
mDragAction = anAction;
return NS_OK;
}
//---------------------------------------------------------
NS_IMETHODIMP
nsBaseDragSession::GetDragAction(uint32_t* anAction) {
*anAction = mDragAction;
return NS_OK;
}
//-------------------------------------------------------------------------
NS_IMETHODIMP
nsBaseDragSession::GetNumDropItems(uint32_t* aNumItems) {
*aNumItems = 0;
return NS_ERROR_FAILURE;
}
//
// GetSourceWindowContext
//
// Returns the window context where the drag was initiated. This will be
// nullptr if the drag began outside of our application.
//
NS_IMETHODIMP
nsBaseDragSession::GetSourceWindowContext(
WindowContext** aSourceWindowContext) {
*aSourceWindowContext = mSourceWindowContext.get();
NS_IF_ADDREF(*aSourceWindowContext);
return NS_OK;
}
NS_IMETHODIMP
nsBaseDragSession::SetSourceWindowContext(WindowContext* aSourceWindowContext) {
// This should only be called in a child process.
MOZ_ASSERT(!XRE_IsParentProcess());
mSourceWindowContext = aSourceWindowContext;
return NS_OK;
}
//
// GetSourceTopWindowContext
//
// Returns the top-level window context where the drag was initiated. This will
// be nullptr if the drag began outside of our application.
//
NS_IMETHODIMP
nsBaseDragSession::GetSourceTopWindowContext(
WindowContext** aSourceTopWindowContext) {
*aSourceTopWindowContext = mSourceTopWindowContext.get();
NS_IF_ADDREF(*aSourceTopWindowContext);
return NS_OK;
}
NS_IMETHODIMP
nsBaseDragSession::SetSourceTopWindowContext(
WindowContext* aSourceTopWindowContext) {
// This should only be called in a child process.
MOZ_ASSERT(!XRE_IsParentProcess());
mSourceTopWindowContext = aSourceTopWindowContext;
return NS_OK;
}
//
// GetSourceNode
//
// Returns the DOM node where the drag was initiated. This will be
// nullptr if the drag began outside of our application.
//
NS_IMETHODIMP
nsBaseDragSession::GetSourceNode(nsINode** aSourceNode) {
*aSourceNode = do_AddRef(mSourceNode).take();
return NS_OK;
}
void nsBaseDragSession::UpdateSource(nsINode* aNewSourceNode,
Selection* aNewSelection) {
MOZ_ASSERT(mSourceNode);
MOZ_ASSERT(aNewSourceNode);
MOZ_ASSERT(mSourceNode->IsInNativeAnonymousSubtree() ||
aNewSourceNode->IsInNativeAnonymousSubtree());
MOZ_ASSERT(mSourceDocument == aNewSourceNode->OwnerDoc());
mSourceNode = aNewSourceNode;
// Don't set mSelection if the session was invoked without selection or
// making it becomes nullptr. The latter occurs when the old frame is
// being destroyed.
if (mSelection && aNewSelection) {
// XXX If the dragging image is created once (e.g., at drag start), the
// image won't be updated unless we notify `DrawDrag` callers.
// However, it must be okay for now to keep using older image of
// Selection.
mSelection = aNewSelection;
}
}
NS_IMETHODIMP
nsBaseDragSession::GetTriggeringPrincipal(nsIPrincipal** aPrincipal) {
NS_IF_ADDREF(*aPrincipal = mTriggeringPrincipal);
return NS_OK;
}
NS_IMETHODIMP
nsBaseDragSession::SetTriggeringPrincipal(nsIPrincipal* aPrincipal) {
mTriggeringPrincipal = aPrincipal;
return NS_OK;
}
NS_IMETHODIMP
nsBaseDragSession::GetCsp(nsIContentSecurityPolicy** aCsp) {
NS_IF_ADDREF(*aCsp = mCsp);
return NS_OK;
}
NS_IMETHODIMP
nsBaseDragSession::SetCsp(nsIContentSecurityPolicy* aCsp) {
mCsp = aCsp;
return NS_OK;
}
//-------------------------------------------------------------------------
NS_IMETHODIMP
nsBaseDragSession::GetData(nsITransferable* aTransferable,
uint32_t aItemIndex) {
return NS_ERROR_FAILURE;
}
//-------------------------------------------------------------------------
NS_IMETHODIMP
nsBaseDragSession::IsDataFlavorSupported(const char* aDataFlavor,
bool* _retval) {
return NS_ERROR_FAILURE;
}
NS_IMETHODIMP
nsBaseDragSession::GetDataTransferXPCOM(DataTransfer** aDataTransfer) {
*aDataTransfer = mDataTransfer;
NS_IF_ADDREF(*aDataTransfer);
return NS_OK;
}
NS_IMETHODIMP
nsBaseDragSession::SetDataTransferXPCOM(DataTransfer* aDataTransfer) {
NS_ENSURE_STATE(aDataTransfer);
mDataTransfer = aDataTransfer;
return NS_OK;
}
DataTransfer* nsBaseDragSession::GetDataTransfer() { return mDataTransfer; }
void nsBaseDragSession::SetDataTransfer(DataTransfer* aDataTransfer) {
mDataTransfer = aDataTransfer;
}
bool nsBaseDragSession::IsSynthesizedForTests() {
return mSessionIsSynthesizedForTests;
}
bool nsBaseDragSession::IsDraggingTextInTextControl() {
return mIsDraggingTextInTextControl;
}
uint32_t nsBaseDragSession::GetEffectAllowedForTests() {
MOZ_ASSERT(mSessionIsSynthesizedForTests);
return mEffectAllowedForTests;
}
NS_IMETHODIMP nsBaseDragSession::SetDragEndPointForTests(int32_t aScreenX,
int32_t aScreenY) {
MOZ_ASSERT(mDoingDrag);
MOZ_ASSERT(mSourceDocument);
MOZ_ASSERT(mSessionIsSynthesizedForTests);
if (!mDoingDrag || !mSourceDocument || !mSessionIsSynthesizedForTests) {
return NS_ERROR_FAILURE;
}
nsPresContext* pc = mSourceDocument->GetPresContext();
if (NS_WARN_IF(!pc)) {
return NS_ERROR_FAILURE;
}
auto p = LayoutDeviceIntPoint::Round(CSSIntPoint(aScreenX, aScreenY) *
pc->CSSToDevPixelScale());
// p is screen-relative, and we want them to be top-level-widget-relative.
if (nsCOMPtr<nsIWidget> widget = pc->GetRootWidget()) {
p -= widget->WidgetToScreenOffset();
p += widget->WidgetToTopLevelWidgetOffset();
}
SetDragEndPoint(p);
return NS_OK;
}
//-------------------------------------------------------------------------
nsresult nsBaseDragSession::InvokeDragSession(
nsIWidget* aWidget, nsINode* aDOMNode, nsIPrincipal* aPrincipal,
nsIContentSecurityPolicy* aCsp, nsICookieJarSettings* aCookieJarSettings,
nsIArray* aTransferableArray, uint32_t aActionType,
nsContentPolicyType aContentPolicyType) {
AUTO_PROFILER_LABEL("nsBaseDragService::InvokeDragSession", OTHER);
NS_ENSURE_TRUE(aDOMNode, NS_ERROR_INVALID_ARG);
// stash the document of the dom node
mSourceDocument = aDOMNode->OwnerDoc();
mTriggeringPrincipal = aPrincipal;
mCsp = aCsp;
mSourceNode = aDOMNode;
mIsDraggingTextInTextControl =
mSourceNode->IsInNativeAnonymousSubtree() &&
TextControlElement::FromNodeOrNull(
mSourceNode->GetClosestNativeAnonymousSubtreeRootParentOrHost());
mContentPolicyType = aContentPolicyType;
mEndDragPoint = LayoutDeviceIntPoint(0, 0);
// When the mouse goes down, the selection code starts a mouse
// capture. However, this gets in the way of determining drag
// feedback for things like trees because the event coordinates
// are in the wrong coord system, so turn off mouse capture.
PresShell::ClearMouseCapture();
if (mSessionIsSynthesizedForTests) {
mDoingDrag = true;
mDragAction = aActionType;
mEffectAllowedForTests = aActionType;
return NS_OK;
}
if (XRE_IsParentProcess()) {
// If you're hitting this, a test is causing the browser to attempt to enter
// the drag-drop native nested event loop, which will put the browser in a
// state that won't run tests properly until there's manual intervention
// to exit the drag-drop loop (either by moving the mouse or hitting
// escape), which can't be done from script since we're in the nested loop.
//
// The best way to avoid this is to use the mock service in tests. See
// synthesizeMockDragAndDrop.
nsCOMPtr<nsIDragService> dragService =
do_GetService("@mozilla.org/widget/dragservice;1");
MOZ_ASSERT(dragService);
MOZ_ASSERT(
!xpc::IsInAutomation() || dragService->IsMockService(),
"About to start drag-drop native loop on which will prevent later "
"tests from running properly.");
}
uint32_t length = 0;
mozilla::Unused << aTransferableArray->GetLength(&length);
if (!length) {
nsCOMPtr<nsIMutableArray> mutableArray =
do_QueryInterface(aTransferableArray);
if (mutableArray) {
// In order to be able trigger dnd, we need to have some transferable
// object.
nsCOMPtr<nsITransferable> trans =
do_CreateInstance("@mozilla.org/widget/transferable;1");
trans->Init(nullptr);
trans->SetDataPrincipal(mSourceNode->NodePrincipal());
trans->SetContentPolicyType(mContentPolicyType);
trans->SetCookieJarSettings(aCookieJarSettings);
mutableArray->AppendElement(trans);
}
} else {
for (uint32_t i = 0; i < length; ++i) {
nsCOMPtr<nsITransferable> trans =
do_QueryElementAt(aTransferableArray, i);
if (trans) {
// Set the dataPrincipal on the transferable.
trans->SetDataPrincipal(mSourceNode->NodePrincipal());
trans->SetContentPolicyType(mContentPolicyType);
trans->SetCookieJarSettings(aCookieJarSettings);
}
}
}
nsresult rv =
InvokeDragSessionImpl(aWidget, aTransferableArray, mRegion, aActionType);
if (NS_FAILED(rv)) {
// Set mDoingDrag so that EndDragSession cleans up and sends the dragend
// event after the aborted drag.
mDoingDrag = true;
EndDragSession(true, 0);
}
return rv;
}
NS_IMETHODIMP
nsBaseDragService::InvokeDragSessionWithImage(
nsINode* aDOMNode, nsIPrincipal* aPrincipal, nsIContentSecurityPolicy* aCsp,
nsICookieJarSettings* aCookieJarSettings, nsIArray* aTransferableArray,
uint32_t aActionType, nsINode* aImage, int32_t aImageX, int32_t aImageY,
DragEvent* aDragEvent, DataTransfer* aDataTransfer) {
nsCOMPtr<nsIWidget> widget =
aDragEvent->WidgetEventPtr()->AsDragEvent()->mWidget;
MOZ_ASSERT(widget);
NS_ENSURE_TRUE(aDragEvent, NS_ERROR_NULL_POINTER);
NS_ENSURE_TRUE(aDataTransfer, NS_ERROR_NULL_POINTER);
NS_ENSURE_TRUE(mSuppressLevel == 0, NS_ERROR_FAILURE);
RefPtr<nsBaseDragSession> session =
CreateDragSession().downcast<nsBaseDragSession>();
if (XRE_IsParentProcess()) {
mCurrentParentDragSession = session;
}
bool isSynthesized =
aDragEvent->WidgetEventPtr()->mFlags.mIsSynthesizedForTests &&
!GetNeverAllowSessionIsSynthesizedForTests();
return session->InitWithImage(widget, aDOMNode, aPrincipal, aCsp,
aCookieJarSettings, aTransferableArray,
aActionType, aImage, aImageX, aImageY,
aDragEvent, aDataTransfer, isSynthesized);
}
nsresult nsBaseDragSession::InitWithImage(
nsIWidget* aWidget, nsINode* aDOMNode, nsIPrincipal* aPrincipal,
nsIContentSecurityPolicy* aCsp, nsICookieJarSettings* aCookieJarSettings,
nsIArray* aTransferableArray, uint32_t aActionType, nsINode* aImage,
int32_t aImageX, int32_t aImageY, DragEvent* aDragEvent,
DataTransfer* aDataTransfer, bool aIsSynthesizedForTests) {
mSessionIsSynthesizedForTests = aIsSynthesizedForTests;
mDataTransfer = aDataTransfer;
mSelection = nullptr;
mHasImage = true;
mDragPopup = nullptr;
mImage = aImage;
mImageOffset = CSSIntPoint(aImageX, aImageY);
mDragStartData = nullptr;
mSourceWindowContext =
aDOMNode ? aDOMNode->OwnerDoc()->GetWindowContext() : nullptr;
mSourceTopWindowContext =
mSourceWindowContext ? mSourceWindowContext->TopWindowContext() : nullptr;
mScreenPosition = aDragEvent->ScreenPoint(CallerType::System);
mInputSource = aDragEvent->InputSource(CallerType::System);
// If dragging within a XUL tree and no custom drag image was
// set, the region argument to InvokeDragSessionWithImage needs
// to be set to the area encompassing the selected rows of the
// tree to ensure that the drag feedback gets clipped to those
// rows. For other content, region should be null.
mRegion = Nothing();
if (aDOMNode && aDOMNode->IsContent() && !aImage) {
if (aDOMNode->NodeInfo()->Equals(nsGkAtoms::treechildren,
kNameSpaceID_XUL)) {
nsTreeBodyFrame* treeBody =
do_QueryFrame(aDOMNode->AsContent()->GetPrimaryFrame());
if (treeBody) {
mRegion = treeBody->GetSelectionRegion();
}
}
}
nsresult rv = InvokeDragSession(
aWidget, aDOMNode, aPrincipal, aCsp, aCookieJarSettings,
aTransferableArray, aActionType, nsIContentPolicy::TYPE_INTERNAL_IMAGE);
mRegion = Nothing();
return rv;
}
NS_IMETHODIMP
nsBaseDragService::InvokeDragSessionWithRemoteImage(
nsINode* aDOMNode, nsIPrincipal* aPrincipal, nsIContentSecurityPolicy* aCsp,
nsICookieJarSettings* aCookieJarSettings, nsIArray* aTransferableArray,
uint32_t aActionType, RemoteDragStartData* aDragStartData,
DragEvent* aDragEvent, DataTransfer* aDataTransfer) {
nsCOMPtr<nsIWidget> widget =
aDragEvent->WidgetEventPtr()->AsDragEvent()->mWidget;
MOZ_ASSERT(widget);
NS_ENSURE_TRUE(aDragEvent, NS_ERROR_NULL_POINTER);
NS_ENSURE_TRUE(aDataTransfer, NS_ERROR_NULL_POINTER);
NS_ENSURE_TRUE(mSuppressLevel == 0, NS_ERROR_FAILURE);
RefPtr<nsBaseDragSession> session =
CreateDragSession().downcast<nsBaseDragSession>();
if (XRE_IsParentProcess()) {
mCurrentParentDragSession = session;
}
bool isSynthesized =
aDragEvent->WidgetEventPtr()->mFlags.mIsSynthesizedForTests &&
!GetNeverAllowSessionIsSynthesizedForTests();
return session->InitWithRemoteImage(widget, aDOMNode, aPrincipal, aCsp,
aCookieJarSettings, aTransferableArray,
aActionType, aDragStartData, aDragEvent,
aDataTransfer, isSynthesized);
}
nsresult nsBaseDragSession::InitWithRemoteImage(
nsIWidget* aWidget, nsINode* aDOMNode, nsIPrincipal* aPrincipal,
nsIContentSecurityPolicy* aCsp, nsICookieJarSettings* aCookieJarSettings,
nsIArray* aTransferableArray, uint32_t aActionType,
RemoteDragStartData* aDragStartData, DragEvent* aDragEvent,
DataTransfer* aDataTransfer, bool aIsSynthesizedForTests) {
mSessionIsSynthesizedForTests = aIsSynthesizedForTests;
mDataTransfer = aDataTransfer;
mSelection = nullptr;
mHasImage = true;
mDragPopup = nullptr;
mImage = nullptr;
mDragStartData = aDragStartData;
mImageOffset = CSSIntPoint(0, 0);
mSourceWindowContext = mDragStartData->GetSourceWindowContext();
mSourceTopWindowContext = mDragStartData->GetSourceTopWindowContext();
mScreenPosition = aDragEvent->ScreenPoint(CallerType::System);
mInputSource = aDragEvent->InputSource(CallerType::System);
nsresult rv = InvokeDragSession(
aWidget, aDOMNode, aPrincipal, aCsp, aCookieJarSettings,
aTransferableArray, aActionType, nsIContentPolicy::TYPE_INTERNAL_IMAGE);
mRegion = Nothing();
return rv;
}
NS_IMETHODIMP
nsBaseDragService::InvokeDragSessionWithSelection(
Selection* aSelection, nsIPrincipal* aPrincipal,
nsIContentSecurityPolicy* aCsp, nsICookieJarSettings* aCookieJarSettings,
nsIArray* aTransferableArray, uint32_t aActionType, DragEvent* aDragEvent,
DataTransfer* aDataTransfer, nsINode* aTargetContent) {
nsCOMPtr<nsIWidget> widget =
aDragEvent->WidgetEventPtr()->AsDragEvent()->mWidget;
MOZ_ASSERT(widget);
NS_ENSURE_TRUE(aSelection, NS_ERROR_NULL_POINTER);
NS_ENSURE_TRUE(aDragEvent, NS_ERROR_NULL_POINTER);
NS_ENSURE_TRUE(aTargetContent, NS_ERROR_NULL_POINTER);
NS_ENSURE_TRUE(mSuppressLevel == 0, NS_ERROR_FAILURE);
RefPtr<nsBaseDragSession> session =
CreateDragSession().downcast<nsBaseDragSession>();
if (XRE_IsParentProcess()) {
mCurrentParentDragSession = session;
}
bool isSynthesized =
aDragEvent->WidgetEventPtr()->mFlags.mIsSynthesizedForTests &&
!GetNeverAllowSessionIsSynthesizedForTests();
return session->InitWithSelection(widget, aSelection, aPrincipal, aCsp,
aCookieJarSettings, aTransferableArray,
aActionType, aDragEvent, aDataTransfer,
aTargetContent, isSynthesized);
}
nsresult nsBaseDragSession::InitWithSelection(
nsIWidget* aWidget, Selection* aSelection, nsIPrincipal* aPrincipal,
nsIContentSecurityPolicy* aCsp, nsICookieJarSettings* aCookieJarSettings,
nsIArray* aTransferableArray, uint32_t aActionType, DragEvent* aDragEvent,
DataTransfer* aDataTransfer, nsINode* aTargetContent,
bool aIsSynthesizedForTests) {
mSessionIsSynthesizedForTests = aIsSynthesizedForTests;
mDataTransfer = aDataTransfer;
mSelection = aSelection;
mHasImage = true;
mDragPopup = nullptr;
mImage = nullptr;
mImageOffset = CSSIntPoint();
mDragStartData = nullptr;
mRegion = Nothing();
mScreenPosition.x = aDragEvent->ScreenX(CallerType::System);
mScreenPosition.y = aDragEvent->ScreenY(CallerType::System);
mInputSource = aDragEvent->InputSource(CallerType::System);
// XXXndeakin this should actually be the deepest node that contains both
// endpoints of the selection
nsCOMPtr<nsINode> node = aTargetContent;
mSourceWindowContext = node->OwnerDoc()->GetWindowContext();
mSourceTopWindowContext =
mSourceWindowContext ? mSourceWindowContext->TopWindowContext() : nullptr;
return InvokeDragSession(aWidget, node, aPrincipal, aCsp, aCookieJarSettings,
aTransferableArray, aActionType,
nsIContentPolicy::TYPE_OTHER);
}
//-------------------------------------------------------------------------
NS_IMETHODIMP
nsBaseDragService::GetCurrentSession(nsISupports* aWidgetProvider,
nsIDragSession** aSession) {
MOZ_ASSERT(XRE_IsParentProcess());
if (!aSession) {
return NS_ERROR_INVALID_ARG;
}
if (!mSuppressLevel && mCurrentParentDragSession) {
RefPtr<nsIDragSession> session = mCurrentParentDragSession;
session.forget(aSession);
} else {
*aSession = nullptr;
}
return NS_OK;
}
//-------------------------------------------------------------------------
nsIDragSession* nsBaseDragService::StartDragSession(
nsISupports* aWidgetProvider) {
MOZ_ASSERT(XRE_IsParentProcess());
if (!aWidgetProvider) {
return nullptr;
}
if (mCurrentParentDragSession) {
return mCurrentParentDragSession;
}
RefPtr<nsIDragSession> session = CreateDragSession();
mCurrentParentDragSession = session;
return session;
}
NS_IMETHODIMP
nsBaseDragSession::InitForTests(uint32_t aAllowedEffect) {
mDragAction = aAllowedEffect;
mEffectAllowedForTests = aAllowedEffect;
mSessionIsSynthesizedForTests = true;
return NS_OK;
}
NS_IMETHODIMP nsBaseDragService::StartDragSessionForTests(
nsISupports* aWidgetProvider, uint32_t aAllowedEffect) {
// This method must set mSessionIsSynthesizedForTests
MOZ_ASSERT(!mNeverAllowSessionIsSynthesizedForTests);
RefPtr<nsIDragSession> session = StartDragSession(aWidgetProvider);
MOZ_ASSERT(session);
session->InitForTests(aAllowedEffect);
return NS_OK;
}
void nsBaseDragSession::OpenDragPopup() {
if (mDragPopup) {
nsXULPopupManager* pm = nsXULPopupManager::GetInstance();
if (pm) {
pm->ShowPopupAtScreen(mDragPopup, mScreenPosition.x - mImageOffset.x,
mScreenPosition.y - mImageOffset.y, false, nullptr);
}
}
}
int32_t nsBaseDragSession::TakeChildProcessDragAction() {
// If the last event was dispatched to the child process, use the drag action
// assigned from it instead and return it. DRAGDROP_ACTION_UNINITIALIZED is
// returned otherwise.
int32_t retval = nsIDragService::DRAGDROP_ACTION_UNINITIALIZED;
if (TakeDragEventDispatchedToChildProcess() &&
mDragActionFromChildProcess !=
nsIDragService::DRAGDROP_ACTION_UNINITIALIZED) {
retval = mDragActionFromChildProcess;
}
return retval;
}
//-------------------------------------------------------------------------
NS_IMETHODIMP
nsBaseDragSession::EndDragSession(bool aDoneDrag, uint32_t aKeyModifiers) {
return EndDragSessionImpl(aDoneDrag, aKeyModifiers);
}
nsresult nsBaseDragSession::EndDragSessionImpl(bool aDoneDrag,
uint32_t aKeyModifiers) {
if (!mDoingDrag || mEndingSession) {
return NS_ERROR_FAILURE;
}
mEndingSession = true;
if (aDoneDrag && !GetSuppressLevel()) {
FireDragEventAtSource(eDragEnd, aKeyModifiers);
}
if (mDragPopup) {
nsXULPopupManager* pm = nsXULPopupManager::GetInstance();
if (pm) {
pm->HidePopup(mDragPopup, {HidePopupOption::DeselectMenu});
}
}
uint32_t dropEffect = nsIDragService::DRAGDROP_ACTION_NONE;
if (mDataTransfer) {
dropEffect = mDataTransfer->DropEffectInt();
}
for (nsWeakPtr& browser : mBrowsers) {
nsCOMPtr<BrowserParent> bp = do_QueryReferent(browser);
if (NS_WARN_IF(!bp)) {
continue;
}
mozilla::Unused << bp->SendEndDragSession(
aDoneDrag, mUserCancelled, mEndDragPoint, aKeyModifiers, dropEffect);
// Continue sending input events with input priority when stopping the dnd
// session.
bp->Manager()->SetInputPriorityEventEnabled(true);
}
mBrowsers.Clear();
// mDataTransfer and the items it owns are going to die anyway, but we
// explicitly deref the contained data here so that we don't have to wait for
// CC to reclaim the memory.
if (XRE_IsParentProcess()) {
DiscardInternalTransferData();
nsCOMPtr<nsIDragService> svc =
do_GetService("@mozilla.org/widget/dragservice;1");
if (svc) {
static_cast<nsBaseDragService*>(svc.get())
->ClearCurrentParentDragSession();
}
}
mDoingDrag = false;
mSessionIsSynthesizedForTests = false;
mIsDraggingTextInTextControl = false;
mEffectAllowedForTests = nsIDragService::DRAGDROP_ACTION_UNINITIALIZED;
mEndingSession = false;
mCanDrop = false;
// release the source we've been holding on to.
mSourceDocument = nullptr;
mSourceNode = nullptr;
mSourceWindowContext = nullptr;
mSourceTopWindowContext = nullptr;
mTriggeringPrincipal = nullptr;
mCsp = nullptr;
mSelection = nullptr;
mDataTransfer = nullptr;
mHasImage = false;
mUserCancelled = false;
mDragPopup = nullptr;
mDragStartData = nullptr;
mImage = nullptr;
mImageOffset = CSSIntPoint();
mScreenPosition = CSSIntPoint();
mEndDragPoint = LayoutDeviceIntPoint(0, 0);
mInputSource = MouseEvent_Binding::MOZ_SOURCE_MOUSE;
mRegion = Nothing();
return NS_OK;
}
void nsBaseDragSession::DiscardInternalTransferData() {
if (mDataTransfer && mSourceNode) {
MOZ_ASSERT(mDataTransfer);
DataTransferItemList* items = mDataTransfer->Items();
for (size_t i = 0; i < items->Length(); i++) {
bool found;
DataTransferItem* item = items->IndexedGetter(i, found);
// Non-OTHER items may still be needed by JS. Skip them.
if (!found || item->Kind() != DataTransferItem::KIND_OTHER) {
continue;
}
nsCOMPtr<nsIVariant> variant = item->DataNoSecurityCheck();
nsCOMPtr<nsIWritableVariant> writable = do_QueryInterface(variant);
if (writable) {
writable->SetAsEmpty();
}
}
}
}
NS_IMETHODIMP
nsBaseDragSession::FireDragEventAtSource(EventMessage aEventMessage,
uint32_t aKeyModifiers) {
if (!mSourceNode || !mSourceDocument || GetSuppressLevel()) {
return NS_OK;
}
RefPtr<PresShell> presShell = mSourceDocument->GetPresShell();
if (!presShell) {
return NS_OK;
}
RefPtr<nsPresContext> pc = presShell->GetPresContext();
nsCOMPtr<nsIWidget> widget = pc ? pc->GetRootWidget() : nullptr;
nsEventStatus status = nsEventStatus_eIgnore;
WidgetDragEvent event(true, aEventMessage, widget);
event.mFlags.mIsSynthesizedForTests = mSessionIsSynthesizedForTests;
event.mInputSource = mInputSource;
if (aEventMessage == eDragEnd) {
event.mRefPoint = mEndDragPoint;
if (widget) {
event.mRefPoint -= widget->WidgetToTopLevelWidgetOffset();
}
event.mUserCancelled = mUserCancelled;
}
event.mModifiers = aKeyModifiers;
// Most drag events aren't able to converted to MouseEvent except to
// eDragStart and eDragEnd.
if (widget && event.CanConvertToInputData()) {
// Send the drag event to APZ, which needs to know about them to be
// able to accurately detect the end of a drag gesture.
widget->DispatchEventToAPZOnly(&event);
}
nsCOMPtr<nsIContent> content = do_QueryInterface(mSourceNode);
return presShell->HandleDOMEventWithTarget(content, &event, &status);
}
/* This is used by Windows and Mac to update the position of a popup being
* used as a drag image during the drag. This isn't used on GTK as it manages
* the drag popup itself.
*/
NS_IMETHODIMP
nsBaseDragSession::DragMoved(int32_t aX, int32_t aY) {
if (mDragPopup) {
nsIFrame* frame = mDragPopup->GetPrimaryFrame();
if (frame && frame->IsMenuPopupFrame()) {
CSSIntPoint cssPos =
RoundedToInt(LayoutDeviceIntPoint(aX, aY) /
frame->PresContext()->CSSToDevPixelScale()) -
mImageOffset;
static_cast<nsMenuPopupFrame*>(frame)->MoveTo(cssPos, true);
}
}
return NS_OK;
}
static PresShell* GetPresShellForContent(nsINode* aDOMNode) {
nsCOMPtr<nsIContent> content = do_QueryInterface(aDOMNode);
if (!content) return nullptr;
RefPtr<Document> document = content->GetComposedDoc();
if (document) {
document->FlushPendingNotifications(FlushType::Layout);
return document->GetPresShell();
}
return nullptr;
}
nsresult nsBaseDragSession::DrawDrag(nsINode* aDOMNode,
const Maybe<CSSIntRegion>& aRegion,
CSSIntPoint aScreenPosition,
LayoutDeviceIntRect* aScreenDragRect,
RefPtr<SourceSurface>* aSurface,
nsPresContext** aPresContext) {
*aSurface = nullptr;
*aPresContext = nullptr;
// use a default size, in case of an error.
aScreenDragRect->SetRect(aScreenPosition.x - mImageOffset.x,
aScreenPosition.y - mImageOffset.y, 1, 1);
// if a drag image was specified, use that, otherwise, use the source node
nsCOMPtr<nsINode> dragNode = mImage ? mImage.get() : aDOMNode;
// get the presshell for the node being dragged. If the drag image is not in
// a document or has no frame, get the presshell from the source drag node
PresShell* presShell = GetPresShellForContent(dragNode);
if (!presShell && mImage) {
presShell = GetPresShellForContent(aDOMNode);
}
if (!presShell) {
return NS_ERROR_FAILURE;
}
*aPresContext = presShell->GetPresContext();
if (mDragStartData) {
if (mImage) {
// Just clear the surface if chrome has overridden it with an image.
*aSurface = nullptr;
} else {
*aSurface = mDragStartData->TakeVisualization(aScreenDragRect);
}
mDragStartData = nullptr;
return NS_OK;
}
// convert mouse position to dev pixels of the prescontext
const CSSIntPoint screenPosition = aScreenPosition - mImageOffset;
const auto screenPoint = LayoutDeviceIntPoint::Round(
screenPosition * (*aPresContext)->CSSToDevPixelScale());
aScreenDragRect->MoveTo(screenPoint.x, screenPoint.y);
// check if drag images are disabled
bool enableDragImages = Preferences::GetBool(DRAGIMAGES_PREF, true);
// didn't want an image, so just set the screen rectangle to the frame size
if (!enableDragImages || !mHasImage) {
// This holds a quantity in RelativeTo{presShell->GetRootFrame(),
// ViewportType::Layout} space.
nsRect presLayoutRect;
if (aRegion) {
// if a region was specified, set the screen rectangle to the area that
// the region occupies
presLayoutRect = ToAppUnits(aRegion->GetBounds(), AppUnitsPerCSSPixel());
} else {
// otherwise, there was no region so just set the rectangle to
// the size of the primary frame of the content.
nsCOMPtr<nsIContent> content = do_QueryInterface(dragNode);
if (nsIFrame* frame = content->GetPrimaryFrame()) {
presLayoutRect = frame->GetBoundingClientRect();
}
}
LayoutDeviceRect screenVisualRect = ViewportUtils::ToScreenRelativeVisual(
LayoutDeviceRect::FromAppUnits(presLayoutRect,
(*aPresContext)->AppUnitsPerDevPixel()),
*aPresContext);
aScreenDragRect->SizeTo(screenVisualRect.Width(),
screenVisualRect.Height());
return NS_OK;
}
// draw the image for selections
if (mSelection) {
LayoutDeviceIntPoint pnt(aScreenDragRect->TopLeft());
*aSurface = presShell->RenderSelection(
mSelection, pnt, aScreenDragRect,
mImage ? RenderImageFlags::None : RenderImageFlags::AutoScale);
return NS_OK;
}
// if a custom image was specified, check if it is an image node and draw
// using the source rather than the displayed image. But if mImage isn't
// an image or canvas, fall through to RenderNode below.
if (mImage) {
nsCOMPtr<nsIContent> content = do_QueryInterface(dragNode);
HTMLCanvasElement* canvas = HTMLCanvasElement::FromNodeOrNull(content);
if (canvas) {
return DrawDragForImage(*aPresContext, nullptr, canvas, aScreenDragRect,
aSurface);
}
nsCOMPtr<nsIImageLoadingContent> imageLoader = do_QueryInterface(dragNode);
// for image nodes, create the drag image from the actual image data
if (imageLoader) {
return DrawDragForImage(*aPresContext, imageLoader, nullptr,
aScreenDragRect, aSurface);
}
// If the image is a popup, use that as the image. This allows custom drag
// images that can change during the drag, but means that any platform
// default image handling won't occur.
// XXXndeakin this should be chrome-only
nsIFrame* frame = content->GetPrimaryFrame();
if (frame && frame->IsMenuPopupFrame()) {
mDragPopup = content->AsElement();
}
}
if (!mDragPopup) {
// otherwise, just draw the node
RenderImageFlags renderFlags =
mImage ? RenderImageFlags::None : RenderImageFlags::AutoScale;
if (renderFlags != RenderImageFlags::None) {
// check if the dragged node itself is an img element
if (dragNode->NodeName().LowerCaseEqualsLiteral("img")) {
renderFlags = renderFlags | RenderImageFlags::IsImage;
} else {
nsINodeList* childList = dragNode->ChildNodes();
uint32_t length = childList->Length();
// check every childnode for being an img element
// XXXbz why don't we need to check descendants recursively?
for (uint32_t count = 0; count < length; ++count) {
if (childList->Item(count)->NodeName().LowerCaseEqualsLiteral(
"img")) {
// if the dragnode contains an image, set RenderImageFlags::IsImage
// flag
renderFlags = renderFlags | RenderImageFlags::IsImage;
break;
}
}
}
}
LayoutDeviceIntPoint pnt(aScreenDragRect->TopLeft());
*aSurface = presShell->RenderNode(dragNode, aRegion, pnt, aScreenDragRect,
renderFlags);
}
// If an image was specified, reset the position from the offset that was
// supplied.
if (mImage) {
aScreenDragRect->MoveTo(screenPoint.x, screenPoint.y);
}
return NS_OK;
}
nsresult nsBaseDragSession::DrawDragForImage(
nsPresContext* aPresContext, nsIImageLoadingContent* aImageLoader,
HTMLCanvasElement* aCanvas, LayoutDeviceIntRect* aScreenDragRect,
RefPtr<SourceSurface>* aSurface) {
nsCOMPtr<imgIContainer> imgContainer;
if (aImageLoader) {
nsCOMPtr<imgIRequest> imgRequest;
nsresult rv = aImageLoader->GetRequest(
nsIImageLoadingContent::CURRENT_REQUEST, getter_AddRefs(imgRequest));
NS_ENSURE_SUCCESS(rv, rv);
if (!imgRequest) return NS_ERROR_NOT_AVAILABLE;
rv = imgRequest->GetImage(getter_AddRefs(imgContainer));
NS_ENSURE_SUCCESS(rv, rv);
if (!imgContainer) return NS_ERROR_NOT_AVAILABLE;
// use the size of the image as the size of the drag image
int32_t imageWidth, imageHeight;
rv = imgContainer->GetWidth(&imageWidth);
NS_ENSURE_SUCCESS(rv, rv);
rv = imgContainer->GetHeight(&imageHeight);
NS_ENSURE_SUCCESS(rv, rv);
aScreenDragRect->SizeTo(aPresContext->CSSPixelsToDevPixels(imageWidth),
aPresContext->CSSPixelsToDevPixels(imageHeight));
} else {
// Bug 1907668: The canvas size should be converted to dev pixels.
NS_ASSERTION(aCanvas, "both image and canvas are null");
CSSIntSize sz = aCanvas->GetSize();
aScreenDragRect->SizeTo(sz.width, sz.height);
}
nsIntSize destSize;
destSize.width = aScreenDragRect->Width();
destSize.height = aScreenDragRect->Height();
if (destSize.width == 0 || destSize.height == 0) return NS_ERROR_FAILURE;
nsresult result = NS_OK;
if (aImageLoader) {
RefPtr<DrawTarget> dt =
gfxPlatform::GetPlatform()->CreateOffscreenContentDrawTarget(
destSize, SurfaceFormat::B8G8R8A8);
if (!dt || !dt->IsValid()) return NS_ERROR_FAILURE;
gfxContext ctx(dt);
ImgDrawResult res = imgContainer->Draw(
&ctx, destSize, ImageRegion::Create(destSize),
imgIContainer::FRAME_CURRENT, SamplingFilter::GOOD, SVGImageContext(),
imgIContainer::FLAG_SYNC_DECODE, 1.0);
if (res == ImgDrawResult::BAD_IMAGE || res == ImgDrawResult::BAD_ARGS ||
res == ImgDrawResult::NOT_SUPPORTED) {
return NS_ERROR_FAILURE;
}
*aSurface = dt->Snapshot();
} else {
*aSurface = aCanvas->GetSurfaceSnapshot();
}
return result;
}
NS_IMETHODIMP
nsBaseDragService::Suppress() {
RefPtr<nsIDragSession> session = mCurrentParentDragSession;
if (session) {
session->EndDragSession(false, 0);
}
++mSuppressLevel;
return NS_OK;
}
NS_IMETHODIMP
nsBaseDragService::Unsuppress() {
--mSuppressLevel;
return NS_OK;
}
NS_IMETHODIMP
nsBaseDragSession::UserCancelled() {
mUserCancelled = true;
return NS_OK;
}
NS_IMETHODIMP
nsBaseDragSession::UpdateDragEffect() {
mDragActionFromChildProcess = mDragAction;
return NS_OK;
}
NS_IMETHODIMP
nsBaseDragSession::UpdateDragImage(nsINode* aImage, int32_t aImageX,
int32_t aImageY) {
// Don't change the image if this is a drag from another source or if there
// is a drag popup.
if (!mSourceNode || mDragPopup) return NS_OK;
mImage = aImage;
mImageOffset = CSSIntPoint(aImageX, aImageY);
return NS_OK;
}
NS_IMETHODIMP
nsBaseDragSession::DragEventDispatchedToChildProcess() {
mDragEventDispatchedToChildProcess = true;
return NS_OK;
}
static bool MaybeAddBrowser(nsTArray<nsWeakPtr>& aBrowsers,
BrowserParent* aBP) {
nsWeakPtr browser = do_GetWeakReference(aBP);
// Equivalent to `InsertElementSorted`, avoiding inserting a duplicate
// element. See bug 1896166.
size_t index = aBrowsers.IndexOfFirstElementGt(browser);
if (index == 0 || aBrowsers[index - 1] != browser) {
aBrowsers.InsertElementAt(index, browser);
return true;
}
return false;
}
static bool RemoveAllBrowsers(nsTArray<nsWeakPtr>& aBrowsers) {
for (auto& weakBrowser : aBrowsers) {
nsCOMPtr<BrowserParent> browser = do_QueryReferent(weakBrowser);
if (NS_WARN_IF(!browser)) {
continue;
}
mozilla::Unused << browser->SendEndDragSession(
true, false, LayoutDeviceIntPoint(), 0,
nsIDragService::DRAGDROP_ACTION_NONE);
}
aBrowsers.Clear();
return true;
}
bool nsBaseDragService::MaybeAddBrowser(BrowserParent* aBP) {
nsCOMPtr<nsIDragSession> session;
GetCurrentSession(nullptr, getter_AddRefs(session));
if (session) {
return session->MaybeAddBrowser(aBP);
}
return ::MaybeAddBrowser(mBrowsers, aBP);
}
bool nsBaseDragService::RemoveAllBrowsers() {
nsCOMPtr<nsIDragSession> session;
GetCurrentSession(nullptr, getter_AddRefs(session));
if (session) {
return session->RemoveAllBrowsers();
}
return ::RemoveAllBrowsers(mBrowsers);
}
bool nsBaseDragSession::MaybeAddBrowser(BrowserParent* aBP) {
return ::MaybeAddBrowser(mBrowsers, aBP);
}
bool nsBaseDragSession::RemoveAllBrowsers() {
return ::RemoveAllBrowsers(mBrowsers);
}
bool nsBaseDragSession::MustUpdateDataTransfer(EventMessage aMessage) {
return false;
}
NS_IMETHODIMP
nsBaseDragSession::MaybeEditorDeletedSourceNode(Element* aEditingHost) {
// If builtin editor of Blink and WebKit deletes the source node,they retarget
// the source node to the editing host.
// https://source.chromium.org/chromium/chromium/src/+/main:third_party/blink/renderer/core/page/drag_controller.cc;l=724;drc=d9ba13b8cd8ac0faed7afc3d1f7e4b67ebac2a0b
// That allows editor apps listens to "dragend" event in editing host or its
// ancestors. Therefore, we should follow them for compatibility.
if (mSourceNode && !mSourceNode->IsInComposedDoc()) {
mSourceNode = aEditingHost;
}
return NS_OK;
}
NS_IMETHODIMP
nsBaseDragService::GetMockDragController(
nsIMockDragServiceController** aController) {
#ifdef ENABLE_TESTS
if (XRE_IsContentProcess()) {
// The mock drag controller is only available in the parent process.
MOZ_ASSERT(!XRE_IsContentProcess());
return NS_ERROR_NOT_AVAILABLE;
}
if (!mMockController) {
mMockController = new mozilla::test::MockDragServiceController();
}
auto controller = mMockController;
controller.forget(aController);
return NS_OK;
#else
*aController = nullptr;
MOZ_ASSERT(false, "CreateMockDragController may only be called for testing");
return NS_ERROR_NOT_AVAILABLE;
#endif
}
NS_IMETHODIMP
nsBaseDragService::GetNeverAllowSessionIsSynthesizedForTests(
bool* aNeverAllow) {
*aNeverAllow = mNeverAllowSessionIsSynthesizedForTests;
return NS_OK;
}
NS_IMETHODIMP
nsBaseDragService::SetNeverAllowSessionIsSynthesizedForTests(bool aNeverAllow) {
mNeverAllowSessionIsSynthesizedForTests = aNeverAllow;
return NS_OK;
}
NS_IMETHODIMP
nsBaseDragSession::SetDragEndPoint(int32_t aScreenX, int32_t aScreenY) {
SetDragEndPoint(LayoutDeviceIntPoint(aScreenX, aScreenY));
return NS_OK;
}
void nsBaseDragSession::TakeSessionBrowserListFromService() {
nsCOMPtr<nsIDragService> svc =
do_GetService("@mozilla.org/widget/dragservice;1");
NS_ENSURE_TRUE_VOID(svc);
mBrowsers =
static_cast<nsBaseDragService*>(svc.get())->TakeSessionBrowserList();
}
/* static */
nsIWidget* nsBaseDragService::GetWidgetFromWidgetProvider(
nsISupports* aWidgetProvider) {
nsCOMPtr<nsIWidget> widget = do_QueryObject(aWidgetProvider);
if (widget) {
return widget;
}
nsPIDOMWindowOuter* outer;
if (aWidgetProvider) {
nsCOMPtr<mozIDOMWindow> window = do_GetInterface(aWidgetProvider);
NS_ENSURE_TRUE(window, nullptr);
RefPtr<nsPIDOMWindowInner> innerWin = nsGlobalWindowInner::Cast(window);
NS_ENSURE_TRUE(innerWin, nullptr);
outer = innerWin->GetOuterWindow();
} else {
nsCOMPtr<nsPIDOMWindowInner> winInner;
winInner = do_QueryInterface(GetEntryGlobal());
NS_ENSURE_TRUE(winInner, nullptr);
outer = winInner->GetOuterWindow();
}
NS_ENSURE_TRUE(outer, nullptr);
nsIDocShell* docShell = outer->GetDocShell();
NS_ENSURE_TRUE(docShell, nullptr);
PresShell* presShell = docShell->GetPresShell();
NS_ENSURE_TRUE(presShell, nullptr);
nsViewManager* vm = presShell->GetViewManager();
NS_ENSURE_TRUE(vm, nullptr);
return vm->GetRootWidget();
}
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