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
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
|
/* -*- 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/. */
/* rendering object that goes directly inside the document's scrollbars */
#ifndef nsCanvasFrame_h___
#define nsCanvasFrame_h___
#include "mozilla/Attributes.h"
#include "mozilla/EventForwards.h"
#include "nsContainerFrame.h"
#include "nsIScrollPositionListener.h"
#include "nsDisplayList.h"
#include "nsIAnonymousContentCreator.h"
class nsPresContext;
class nsRenderingContext;
/**
* Root frame class.
*
* The root frame is the parent frame for the document element's frame.
* It only supports having a single child frame which must be an area
* frame.
* @note nsCanvasFrame keeps overflow container continuations of its child
* frame in the main child list.
*/
class nsCanvasFrame final : public nsContainerFrame,
public nsIScrollPositionListener,
public nsIAnonymousContentCreator
{
public:
explicit nsCanvasFrame(nsStyleContext* aContext)
: nsContainerFrame(aContext),
mDoPaintFocus(false),
mAddedScrollPositionListener(false) {}
NS_DECL_QUERYFRAME_TARGET(nsCanvasFrame)
NS_DECL_QUERYFRAME
NS_DECL_FRAMEARENA_HELPERS
virtual void DestroyFrom(nsIFrame* aDestructRoot) override;
virtual mozilla::WritingMode GetWritingMode() const override
{
nsIContent* rootElem = GetContent();
if (rootElem) {
nsIFrame* rootElemFrame = rootElem->GetPrimaryFrame();
if (rootElemFrame) {
return rootElemFrame->GetWritingMode();
}
}
return nsIFrame::GetWritingMode();
}
#ifdef DEBUG
virtual void SetInitialChildList(ChildListID aListID,
nsFrameList& aChildList) override;
virtual void AppendFrames(ChildListID aListID,
nsFrameList& aFrameList) override;
virtual void InsertFrames(ChildListID aListID,
nsIFrame* aPrevFrame,
nsFrameList& aFrameList) override;
virtual void RemoveFrame(ChildListID aListID,
nsIFrame* aOldFrame) override;
#endif
virtual nscoord GetMinISize(nsRenderingContext *aRenderingContext) override;
virtual nscoord GetPrefISize(nsRenderingContext *aRenderingContext) override;
virtual void Reflow(nsPresContext* aPresContext,
ReflowOutput& aDesiredSize,
const ReflowInput& aReflowInput,
nsReflowStatus& aStatus) override;
virtual bool IsFrameOfType(uint32_t aFlags) const override
{
return nsContainerFrame::IsFrameOfType(aFlags &
~(nsIFrame::eCanContainOverflowContainers));
}
// nsIAnonymousContentCreator
virtual nsresult CreateAnonymousContent(nsTArray<ContentInfo>& aElements) override;
virtual void AppendAnonymousContentTo(nsTArray<nsIContent*>& aElements, uint32_t aFilter) override;
mozilla::dom::Element* GetCustomContentContainer() const
{
return mCustomContentContainer;
}
/**
* Unhide the CustomContentContainer. This call only has an effect if
* mCustomContentContainer is non-null.
*/
void ShowCustomContentContainer();
/**
* Hide the CustomContentContainer. This call only has an effect if
* mCustomContentContainer is non-null.
*/
void HideCustomContentContainer();
/** SetHasFocus tells the CanvasFrame to draw with focus ring
* @param aHasFocus true to show focus ring, false to hide it
*/
NS_IMETHOD SetHasFocus(bool aHasFocus);
virtual void BuildDisplayList(nsDisplayListBuilder* aBuilder,
const nsDisplayListSet& aLists) override;
void PaintFocus(mozilla::gfx::DrawTarget* aRenderingContext, nsPoint aPt);
// nsIScrollPositionListener
virtual void ScrollPositionWillChange(nscoord aX, nscoord aY) override;
virtual void ScrollPositionDidChange(nscoord aX, nscoord aY) override {}
/**
* Get the "type" of the frame
*
* @see nsGkAtoms::canvasFrame
*/
virtual nsIAtom* GetType() const override;
#ifdef DEBUG_FRAME_DUMP
virtual nsresult GetFrameName(nsAString& aResult) const override;
#endif
virtual nsresult GetContentForEvent(mozilla::WidgetEvent* aEvent,
nsIContent** aContent) override;
nsRect CanvasArea() const;
protected:
// Data members
bool mDoPaintFocus;
bool mAddedScrollPositionListener;
nsCOMPtr<mozilla::dom::Element> mCustomContentContainer;
};
/**
* Override nsDisplayBackground methods so that we pass aBGClipRect to
* PaintBackground, covering the whole overflow area.
* We can also paint an "extra background color" behind the normal
* background.
*/
class nsDisplayCanvasBackgroundColor : public nsDisplaySolidColorBase {
public:
nsDisplayCanvasBackgroundColor(nsDisplayListBuilder* aBuilder, nsIFrame *aFrame)
: nsDisplaySolidColorBase(aBuilder, aFrame, NS_RGBA(0,0,0,0))
{
}
virtual bool ComputeVisibility(nsDisplayListBuilder* aBuilder,
nsRegion* aVisibleRegion) override
{
return NS_GET_A(mColor) > 0;
}
virtual nsRect GetBounds(nsDisplayListBuilder* aBuilder, bool* aSnap) override
{
nsCanvasFrame* frame = static_cast<nsCanvasFrame*>(mFrame);
*aSnap = true;
return frame->CanvasArea() + ToReferenceFrame();
}
virtual void HitTest(nsDisplayListBuilder* aBuilder, const nsRect& aRect,
HitTestState* aState, nsTArray<nsIFrame*> *aOutFrames) override
{
// We need to override so we don't consider border-radius.
aOutFrames->AppendElement(mFrame);
}
virtual void Paint(nsDisplayListBuilder* aBuilder,
nsRenderingContext* aCtx) override;
void SetExtraBackgroundColor(nscolor aColor)
{
mColor = aColor;
}
NS_DISPLAY_DECL_NAME("CanvasBackgroundColor", TYPE_CANVAS_BACKGROUND_COLOR)
#ifdef MOZ_DUMP_PAINTING
virtual void WriteDebugInfo(std::stringstream& aStream) override;
#endif
};
class nsDisplayCanvasBackgroundImage : public nsDisplayBackgroundImage {
public:
nsDisplayCanvasBackgroundImage(nsDisplayListBuilder* aBuilder, nsIFrame* aFrame,
uint32_t aLayer, const nsStyleBackground* aBg)
: nsDisplayBackgroundImage(aBuilder, aFrame, aLayer,
aFrame->GetRectRelativeToSelf() + aBuilder->ToReferenceFrame(aFrame),
aBg)
{
if (ShouldFixToViewport(aBuilder)) {
mAnimatedGeometryRoot = aBuilder->FindAnimatedGeometryRootFor(this);
}
}
virtual void Paint(nsDisplayListBuilder* aBuilder, nsRenderingContext* aCtx) override;
virtual void NotifyRenderingChanged() override
{
mFrame->DeleteProperty(nsIFrame::CachedBackgroundImageDT());
}
virtual bool ShouldFixToViewport(nsDisplayListBuilder* aBuilder) override
{
// Put background-attachment:fixed canvas background images in their own
// compositing layer. Since we know their background painting area can't
// change (unless the viewport size itself changes), async scrolling
// will work well.
return ShouldTreatAsFixed() &&
!mBackgroundStyle->mImage.mLayers[mLayer].mImage.IsEmpty();
}
// We still need to paint a background color as well as an image for this item,
// so we can't support this yet.
virtual bool SupportsOptimizingToImage() override { return false; }
bool IsSingleFixedPositionImage(nsDisplayListBuilder* aBuilder,
const nsRect& aClipRect,
gfxRect* aDestRect);
NS_DISPLAY_DECL_NAME("CanvasBackgroundImage", TYPE_CANVAS_BACKGROUND_IMAGE)
};
class nsDisplayCanvasThemedBackground : public nsDisplayThemedBackground {
public:
nsDisplayCanvasThemedBackground(nsDisplayListBuilder* aBuilder, nsIFrame* aFrame)
: nsDisplayThemedBackground(aBuilder, aFrame,
aFrame->GetRectRelativeToSelf() + aBuilder->ToReferenceFrame(aFrame))
{}
virtual void Paint(nsDisplayListBuilder* aBuilder, nsRenderingContext* aCtx) override;
NS_DISPLAY_DECL_NAME("CanvasThemedBackground", TYPE_CANVAS_THEMED_BACKGROUND)
};
#endif /* nsCanvasFrame_h___ */
|
