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
|
// Copyright 2014 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "config.h"
#include "core/paint/ScrollableAreaPainter.h"
#include "core/page/Page.h"
#include "core/paint/ScrollbarPainter.h"
#include "core/rendering/PaintInfo.h"
#include "core/rendering/RenderLayer.h"
#include "core/rendering/RenderLayerScrollableArea.h"
#include "core/rendering/RenderView.h"
#include "platform/graphics/GraphicsContext.h"
#include "platform/graphics/GraphicsContextStateSaver.h"
#include "platform/graphics/paint/DrawingRecorder.h"
namespace blink {
void ScrollableAreaPainter::paintResizer(GraphicsContext* context, const IntPoint& paintOffset, const IntRect& damageRect)
{
if (m_renderLayerScrollableArea.box().style()->resize() == RESIZE_NONE)
return;
IntRect absRect = m_renderLayerScrollableArea.resizerCornerRect(m_renderLayerScrollableArea.box().pixelSnappedBorderBoxRect(), ResizerForPointer);
absRect.moveBy(paintOffset);
if (!absRect.intersects(damageRect))
return;
DrawingRecorder recorder(context, m_renderLayerScrollableArea.box().displayItemClient(), DisplayItem::Resizer, damageRect);
if (m_renderLayerScrollableArea.resizer()) {
ScrollbarPainter::paintIntoRect(m_renderLayerScrollableArea.resizer(), context, paintOffset, absRect);
return;
}
drawPlatformResizerImage(context, absRect);
// Draw a frame around the resizer (1px grey line) if there are any scrollbars present.
// Clipping will exclude the right and bottom edges of this frame.
if (!m_renderLayerScrollableArea.hasOverlayScrollbars() && m_renderLayerScrollableArea.hasScrollbar()) {
GraphicsContextStateSaver stateSaver(*context);
context->clip(absRect);
IntRect largerCorner = absRect;
largerCorner.setSize(IntSize(largerCorner.width() + 1, largerCorner.height() + 1));
context->setStrokeColor(Color(217, 217, 217));
context->setStrokeThickness(1.0f);
context->setFillColor(Color::transparent);
context->drawRect(largerCorner);
}
}
void ScrollableAreaPainter::drawPlatformResizerImage(GraphicsContext* context, IntRect resizerCornerRect)
{
float deviceScaleFactor = blink::deviceScaleFactor(m_renderLayerScrollableArea.box().frame());
RefPtr<Image> resizeCornerImage;
IntSize cornerResizerSize;
if (deviceScaleFactor >= 2) {
DEFINE_STATIC_REF(Image, resizeCornerImageHiRes, (Image::loadPlatformResource("textAreaResizeCorner@2x")));
resizeCornerImage = resizeCornerImageHiRes;
cornerResizerSize = resizeCornerImage->size();
cornerResizerSize.scale(0.5f);
} else {
DEFINE_STATIC_REF(Image, resizeCornerImageLoRes, (Image::loadPlatformResource("textAreaResizeCorner")));
resizeCornerImage = resizeCornerImageLoRes;
cornerResizerSize = resizeCornerImage->size();
}
if (m_renderLayerScrollableArea.box().style()->shouldPlaceBlockDirectionScrollbarOnLogicalLeft()) {
context->save();
context->translate(resizerCornerRect.x() + cornerResizerSize.width(), resizerCornerRect.y() + resizerCornerRect.height() - cornerResizerSize.height());
context->scale(-1.0, 1.0);
context->drawImage(resizeCornerImage.get(), IntRect(IntPoint(), cornerResizerSize));
context->restore();
return;
}
IntRect imageRect(resizerCornerRect.maxXMaxYCorner() - cornerResizerSize, cornerResizerSize);
context->drawImage(resizeCornerImage.get(), imageRect);
}
void ScrollableAreaPainter::paintOverflowControls(GraphicsContext* context, const IntPoint& paintOffset, const IntRect& damageRect, bool paintingOverlayControls)
{
// Don't do anything if we have no overflow.
if (!m_renderLayerScrollableArea.box().hasOverflowClip())
return;
IntPoint adjustedPaintOffset = paintOffset;
if (paintingOverlayControls)
adjustedPaintOffset = m_renderLayerScrollableArea.cachedOverlayScrollbarOffset();
// Move the scrollbar widgets if necessary. We normally move and resize widgets during layout,
// but sometimes widgets can move without layout occurring (most notably when you scroll a
// document that contains fixed positioned elements).
// FIXME: this code should not be necessary.
m_renderLayerScrollableArea.positionOverflowControls(toIntSize(adjustedPaintOffset));
// Overlay scrollbars paint in a second pass through the layer tree so that they will paint
// on top of everything else. If this is the normal painting pass, paintingOverlayControls
// will be false, and we should just tell the root layer that there are overlay scrollbars
// that need to be painted. That will cause the second pass through the layer tree to run,
// and we'll paint the scrollbars then. In the meantime, cache tx and ty so that the
// second pass doesn't need to re-enter the RenderTree to get it right.
if (m_renderLayerScrollableArea.hasOverlayScrollbars() && !paintingOverlayControls) {
m_renderLayerScrollableArea.setCachedOverlayScrollbarOffset(paintOffset);
// It's not necessary to do the second pass if the scrollbars paint into layers.
if ((m_renderLayerScrollableArea.horizontalScrollbar() && m_renderLayerScrollableArea.layerForHorizontalScrollbar()) || (m_renderLayerScrollableArea.verticalScrollbar() && m_renderLayerScrollableArea.layerForVerticalScrollbar()))
return;
IntRect localDamgeRect = damageRect;
localDamgeRect.moveBy(-paintOffset);
if (!overflowControlsIntersectRect(localDamgeRect))
return;
RenderView* renderView = m_renderLayerScrollableArea.box().view();
RenderLayer* paintingRoot = m_renderLayerScrollableArea.layer()->enclosingLayerWithCompositedLayerMapping(IncludeSelf);
if (!paintingRoot)
paintingRoot = renderView->layer();
paintingRoot->setContainsDirtyOverlayScrollbars(true);
return;
}
// This check is required to avoid painting custom CSS scrollbars twice.
if (paintingOverlayControls && !m_renderLayerScrollableArea.hasOverlayScrollbars())
return;
// Now that we're sure the scrollbars are in the right place, paint them.
if (m_renderLayerScrollableArea.horizontalScrollbar() && !m_renderLayerScrollableArea.layerForHorizontalScrollbar())
m_renderLayerScrollableArea.horizontalScrollbar()->paint(context, damageRect);
if (m_renderLayerScrollableArea.verticalScrollbar() && !m_renderLayerScrollableArea.layerForVerticalScrollbar())
m_renderLayerScrollableArea.verticalScrollbar()->paint(context, damageRect);
if (m_renderLayerScrollableArea.layerForScrollCorner())
return;
// We fill our scroll corner with white if we have a scrollbar that doesn't run all the way up to the
// edge of the box.
paintScrollCorner(context, adjustedPaintOffset, damageRect);
// Paint our resizer last, since it sits on top of the scroll corner.
paintResizer(context, adjustedPaintOffset, damageRect);
}
bool ScrollableAreaPainter::overflowControlsIntersectRect(const IntRect& localRect) const
{
const IntRect borderBox = m_renderLayerScrollableArea.box().pixelSnappedBorderBoxRect();
if (m_renderLayerScrollableArea.rectForHorizontalScrollbar(borderBox).intersects(localRect))
return true;
if (m_renderLayerScrollableArea.rectForVerticalScrollbar(borderBox).intersects(localRect))
return true;
if (m_renderLayerScrollableArea.scrollCornerRect().intersects(localRect))
return true;
if (m_renderLayerScrollableArea.resizerCornerRect(borderBox, ResizerForPointer).intersects(localRect))
return true;
return false;
}
void ScrollableAreaPainter::paintScrollCorner(GraphicsContext* context, const IntPoint& paintOffset, const IntRect& damageRect)
{
IntRect absRect = m_renderLayerScrollableArea.scrollCornerRect();
absRect.moveBy(paintOffset);
if (!absRect.intersects(damageRect))
return;
DrawingRecorder recorder(context, m_renderLayerScrollableArea.box().displayItemClient(), DisplayItem::ScrollbarCorner, damageRect);
if (m_renderLayerScrollableArea.scrollCorner()) {
ScrollbarPainter::paintIntoRect(m_renderLayerScrollableArea.scrollCorner(), context, paintOffset, absRect);
return;
}
// We don't want to paint white if we have overlay scrollbars, since we need
// to see what is behind it.
if (!m_renderLayerScrollableArea.hasOverlayScrollbars())
context->fillRect(absRect, Color::white);
}
} // namespace blink
|
