summaryrefslogtreecommitdiffstats
path: root/dom/events/DragEvent.cpp
blob: 55f1e85891f1c9f928eb9dee7847dbbf59f8dcc9 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
/* -*- Mode: C++; tab-width: 8; 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 "mozilla/dom/DragEvent.h"
#include "mozilla/MouseEvents.h"
#include "nsContentUtils.h"
#include "prtime.h"

namespace mozilla {
namespace dom {

DragEvent::DragEvent(EventTarget* aOwner,
                     nsPresContext* aPresContext,
                     WidgetDragEvent* aEvent)
  : MouseEvent(aOwner, aPresContext,
               aEvent ? aEvent :
                        new WidgetDragEvent(false, eVoidEvent, nullptr))
{
  if (aEvent) {
    mEventIsInternal = false;
  }
  else {
    mEventIsInternal = true;
    mEvent->mTime = PR_Now();
    mEvent->mRefPoint = LayoutDeviceIntPoint(0, 0);
    mEvent->AsMouseEvent()->inputSource = nsIDOMMouseEvent::MOZ_SOURCE_UNKNOWN;
  }
}

NS_IMPL_ADDREF_INHERITED(DragEvent, MouseEvent)
NS_IMPL_RELEASE_INHERITED(DragEvent, MouseEvent)

NS_INTERFACE_MAP_BEGIN(DragEvent)
  NS_INTERFACE_MAP_ENTRY(nsIDOMDragEvent)
NS_INTERFACE_MAP_END_INHERITING(MouseEvent)

void
DragEvent::InitDragEvent(const nsAString& aType,
                         bool aCanBubble,
                         bool aCancelable,
                         nsGlobalWindow* aView,
                         int32_t aDetail,
                         int32_t aScreenX,
                         int32_t aScreenY,
                         int32_t aClientX,
                         int32_t aClientY,
                         bool aCtrlKey,
                         bool aAltKey,
                         bool aShiftKey,
                         bool aMetaKey,
                         uint16_t aButton,
                         EventTarget* aRelatedTarget,
                         DataTransfer* aDataTransfer)
{
  NS_ENSURE_TRUE_VOID(!mEvent->mFlags.mIsBeingDispatched);

  MouseEvent::InitMouseEvent(aType, aCanBubble, aCancelable,
                             aView, aDetail, aScreenX, aScreenY,
                             aClientX, aClientY, aCtrlKey, aAltKey,
                             aShiftKey, aMetaKey, aButton, aRelatedTarget);
  if (mEventIsInternal) {
    mEvent->AsDragEvent()->mDataTransfer = aDataTransfer;
  }
}

NS_IMETHODIMP
DragEvent::GetDataTransfer(nsIDOMDataTransfer** aDataTransfer)
{
  NS_IF_ADDREF(*aDataTransfer = GetDataTransfer());
  return NS_OK;
}

DataTransfer*
DragEvent::GetDataTransfer()
{
  // the dataTransfer field of the event caches the DataTransfer associated
  // with the drag. It is initialized when an attempt is made to retrieve it
  // rather that when the event is created to avoid duplicating the data when
  // no listener ever uses it.
  if (!mEvent || mEvent->mClass != eDragEventClass) {
    NS_WARNING("Tried to get dataTransfer from non-drag event!");
    return nullptr;
  }

  WidgetDragEvent* dragEvent = mEvent->AsDragEvent();
  // for synthetic events, just use the supplied data transfer object even if null
  if (!mEventIsInternal) {
    nsresult rv = nsContentUtils::SetDataTransferInEvent(dragEvent);
    NS_ENSURE_SUCCESS(rv, nullptr);
  }

  return dragEvent->mDataTransfer;
}

// static
already_AddRefed<DragEvent>
DragEvent::Constructor(const GlobalObject& aGlobal,
                       const nsAString& aType,
                       const DragEventInit& aParam,
                       ErrorResult& aRv)
{
  nsCOMPtr<EventTarget> t = do_QueryInterface(aGlobal.GetAsSupports());
  RefPtr<DragEvent> e = new DragEvent(t, nullptr, nullptr);
  bool trusted = e->Init(t);
  e->InitDragEvent(aType, aParam.mBubbles, aParam.mCancelable,
                   aParam.mView, aParam.mDetail, aParam.mScreenX,
                   aParam.mScreenY, aParam.mClientX, aParam.mClientY,
                   aParam.mCtrlKey, aParam.mAltKey, aParam.mShiftKey,
                   aParam.mMetaKey, aParam.mButton, aParam.mRelatedTarget,
                   aParam.mDataTransfer);
  e->InitializeExtraMouseEventDictionaryMembers(aParam);
  e->SetTrusted(trusted);
  e->SetComposed(aParam.mComposed);
  return e.forget();
}

} // namespace dom
} // namespace mozilla

using namespace mozilla;
using namespace mozilla::dom;

already_AddRefed<DragEvent>
NS_NewDOMDragEvent(EventTarget* aOwner,
                   nsPresContext* aPresContext,
                   WidgetDragEvent* aEvent) 
{
  RefPtr<DragEvent> event =
    new DragEvent(aOwner, aPresContext, aEvent);
  return event.forget();
}