tor-browser

The Tor Browser
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DragEvent.cpp (3741B)

      1 /* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
      2 /* vim: set ts=8 sts=2 et sw=2 tw=80: */
      3 /* This Source Code Form is subject to the terms of the Mozilla Public
      4 * License, v. 2.0. If a copy of the MPL was not distributed with this
      5 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
      6 
      7 #include "DragEvent.h"
      8 
      9 #include "mozilla/MouseEvents.h"
     10 #include "mozilla/dom/MouseEventBinding.h"
     11 #include "nsContentUtils.h"
     12 
     13 namespace mozilla::dom {
     14 
     15 DragEvent::DragEvent(EventTarget* aOwner, nsPresContext* aPresContext,
     16                     WidgetDragEvent* aEvent)
     17    : MouseEvent(
     18          aOwner, aPresContext,
     19          aEvent ? aEvent : new WidgetDragEvent(false, eVoidEvent, nullptr)) {
     20  if (aEvent) {
     21    mEventIsInternal = false;
     22  } else {
     23    mEventIsInternal = true;
     24    mEvent->mRefPoint = LayoutDeviceIntPoint(0, 0);
     25    mEvent->AsMouseEvent()->mInputSource =
     26        MouseEvent_Binding::MOZ_SOURCE_UNKNOWN;
     27  }
     28 }
     29 
     30 void DragEvent::InitDragEventInternal(
     31    const nsAString& aType, bool aCanBubble, bool aCancelable,
     32    nsGlobalWindowInner* aView, int32_t aDetail, double aScreenX,
     33    double aScreenY, double aClientX, double aClientY, bool aCtrlKey,
     34    bool aAltKey, bool aShiftKey, bool aMetaKey, uint16_t aButton,
     35    EventTarget* aRelatedTarget, DataTransfer* aDataTransfer) {
     36  NS_ENSURE_TRUE_VOID(!mEvent->mFlags.mIsBeingDispatched);
     37 
     38  MouseEvent::InitMouseEventInternal(aType, aCanBubble, aCancelable, aView,
     39                                     aDetail, aScreenX, aScreenY, aClientX,
     40                                     aClientY, aCtrlKey, aAltKey, aShiftKey,
     41                                     aMetaKey, aButton, aRelatedTarget);
     42  if (mEventIsInternal) {
     43    mEvent->AsDragEvent()->mDataTransfer = aDataTransfer;
     44  }
     45 }
     46 
     47 DataTransfer* DragEvent::GetDataTransfer() {
     48  // the dataTransfer field of the event caches the DataTransfer associated
     49  // with the drag. It is initialized when an attempt is made to retrieve it
     50  // rather that when the event is created to avoid duplicating the data when
     51  // no listener ever uses it.
     52  if (!mEvent || mEvent->mClass != eDragEventClass) {
     53    NS_WARNING("Tried to get dataTransfer from non-drag event!");
     54    return nullptr;
     55  }
     56 
     57  WidgetDragEvent* dragEvent = mEvent->AsDragEvent();
     58  // for synthetic events, just use the supplied data transfer object even if
     59  // null
     60  if (!mEventIsInternal) {
     61    nsresult rv = nsContentUtils::SetDataTransferInEvent(dragEvent);
     62    NS_ENSURE_SUCCESS(rv, nullptr);
     63  }
     64 
     65  return dragEvent->mDataTransfer;
     66 }
     67 
     68 // static
     69 already_AddRefed<DragEvent> DragEvent::Constructor(
     70    const GlobalObject& aGlobal, const nsAString& aType,
     71    const DragEventInit& aParam) {
     72  nsCOMPtr<EventTarget> t = do_QueryInterface(aGlobal.GetAsSupports());
     73  RefPtr<DragEvent> e = new DragEvent(t, nullptr, nullptr);
     74  bool trusted = e->Init(t);
     75  e->InitDragEventInternal(
     76      aType, aParam.mBubbles, aParam.mCancelable, aParam.mView, aParam.mDetail,
     77      aParam.mScreenX, aParam.mScreenY, aParam.mClientX, aParam.mClientY,
     78      aParam.mCtrlKey, aParam.mAltKey, aParam.mShiftKey, aParam.mMetaKey,
     79      aParam.mButton, aParam.mRelatedTarget, aParam.mDataTransfer);
     80  e->InitializeExtraMouseEventDictionaryMembers(aParam);
     81  e->SetTrusted(trusted);
     82  e->SetComposed(aParam.mComposed);
     83  return e.forget();
     84 }
     85 
     86 }  // namespace mozilla::dom
     87 
     88 using namespace mozilla;
     89 using namespace mozilla::dom;
     90 
     91 already_AddRefed<DragEvent> NS_NewDOMDragEvent(EventTarget* aOwner,
     92                                               nsPresContext* aPresContext,
     93                                               WidgetDragEvent* aEvent) {
     94  RefPtr<DragEvent> event = new DragEvent(aOwner, aPresContext, aEvent);
     95  return event.forget();
     96 }