1 /*
2 * Copyright (C) 2008 Apple Inc. All Rights Reserved.
3 *
4 * Redistribution and use in source and binary forms, with or without
5 * modification, are permitted provided that the following conditions
6 * are met:
7 * 1. Redistributions of source code must retain the above copyright
8 * notice, this list of conditions and the following disclaimer.
9 * 2. Redistributions in binary form must reproduce the above copyright
10 * notice, this list of conditions and the following disclaimer in the
11 * documentation and/or other materials provided with the distribution.
12 *
13 * THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
14 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
15 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
16 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR
17 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
18 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
19 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
20 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
21 * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
22 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
23 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
24 */
25
26 #include "config.h"
27 #include "core/rendering/RenderScrollbarPart.h"
28
29 #include "core/rendering/PaintInfo.h"
30 #include "core/rendering/RenderScrollbar.h"
31 #include "core/rendering/RenderScrollbarTheme.h"
32 #include "core/rendering/RenderView.h"
33 #include "platform/LengthFunctions.h"
34
35 namespace blink {
36
RenderScrollbarPart(RenderScrollbar * scrollbar,ScrollbarPart part)37 RenderScrollbarPart::RenderScrollbarPart(RenderScrollbar* scrollbar, ScrollbarPart part)
38 : RenderBlock(0)
39 , m_scrollbar(scrollbar)
40 , m_part(part)
41 {
42 }
43
~RenderScrollbarPart()44 RenderScrollbarPart::~RenderScrollbarPart()
45 {
46 }
47
createAnonymous(Document * document,RenderScrollbar * scrollbar,ScrollbarPart part)48 RenderScrollbarPart* RenderScrollbarPart::createAnonymous(Document* document, RenderScrollbar* scrollbar, ScrollbarPart part)
49 {
50 RenderScrollbarPart* renderer = new RenderScrollbarPart(scrollbar, part);
51 renderer->setDocumentForAnonymous(document);
52 return renderer;
53 }
54
layout()55 void RenderScrollbarPart::layout()
56 {
57 setLocation(LayoutPoint()); // We don't worry about positioning ourselves. We're just determining our minimum width/height.
58 if (m_scrollbar->orientation() == HorizontalScrollbar)
59 layoutHorizontalPart();
60 else
61 layoutVerticalPart();
62
63 clearNeedsLayout();
64 }
65
layoutHorizontalPart()66 void RenderScrollbarPart::layoutHorizontalPart()
67 {
68 if (m_part == ScrollbarBGPart) {
69 setWidth(m_scrollbar->width());
70 computeScrollbarHeight();
71 } else {
72 computeScrollbarWidth();
73 setHeight(m_scrollbar->height());
74 }
75 }
76
layoutVerticalPart()77 void RenderScrollbarPart::layoutVerticalPart()
78 {
79 if (m_part == ScrollbarBGPart) {
80 computeScrollbarWidth();
81 setHeight(m_scrollbar->height());
82 } else {
83 setWidth(m_scrollbar->width());
84 computeScrollbarHeight();
85 }
86 }
87
calcScrollbarThicknessUsing(SizeType sizeType,const Length & length,int containingLength)88 static int calcScrollbarThicknessUsing(SizeType sizeType, const Length& length, int containingLength)
89 {
90 if (!length.isIntrinsicOrAuto() || (sizeType == MinSize && length.isAuto()))
91 return minimumValueForLength(length, containingLength);
92 return ScrollbarTheme::theme()->scrollbarThickness();
93 }
94
computeScrollbarWidth()95 void RenderScrollbarPart::computeScrollbarWidth()
96 {
97 if (!m_scrollbar->owningRenderer())
98 return;
99 // FIXME: We are querying layout information but nothing guarantees that it's up-to-date, especially since we are called at style change.
100 // FIXME: Querying the style's border information doesn't work on table cells with collapsing borders.
101 int visibleSize = m_scrollbar->owningRenderer()->width() - m_scrollbar->owningRenderer()->style()->borderLeftWidth() - m_scrollbar->owningRenderer()->style()->borderRightWidth();
102 int w = calcScrollbarThicknessUsing(MainOrPreferredSize, style()->width(), visibleSize);
103 int minWidth = calcScrollbarThicknessUsing(MinSize, style()->minWidth(), visibleSize);
104 int maxWidth = style()->maxWidth().isMaxSizeNone() ? w : calcScrollbarThicknessUsing(MaxSize, style()->maxWidth(), visibleSize);
105 setWidth(std::max(minWidth, std::min(maxWidth, w)));
106
107 // Buttons and track pieces can all have margins along the axis of the scrollbar.
108 m_marginBox.setLeft(minimumValueForLength(style()->marginLeft(), visibleSize));
109 m_marginBox.setRight(minimumValueForLength(style()->marginRight(), visibleSize));
110 }
111
computeScrollbarHeight()112 void RenderScrollbarPart::computeScrollbarHeight()
113 {
114 if (!m_scrollbar->owningRenderer())
115 return;
116 // FIXME: We are querying layout information but nothing guarantees that it's up-to-date, especially since we are called at style change.
117 // FIXME: Querying the style's border information doesn't work on table cells with collapsing borders.
118 int visibleSize = m_scrollbar->owningRenderer()->height() - m_scrollbar->owningRenderer()->style()->borderTopWidth() - m_scrollbar->owningRenderer()->style()->borderBottomWidth();
119 int h = calcScrollbarThicknessUsing(MainOrPreferredSize, style()->height(), visibleSize);
120 int minHeight = calcScrollbarThicknessUsing(MinSize, style()->minHeight(), visibleSize);
121 int maxHeight = style()->maxHeight().isMaxSizeNone() ? h : calcScrollbarThicknessUsing(MaxSize, style()->maxHeight(), visibleSize);
122 setHeight(std::max(minHeight, std::min(maxHeight, h)));
123
124 // Buttons and track pieces can all have margins along the axis of the scrollbar.
125 m_marginBox.setTop(minimumValueForLength(style()->marginTop(), visibleSize));
126 m_marginBox.setBottom(minimumValueForLength(style()->marginBottom(), visibleSize));
127 }
128
computePreferredLogicalWidths()129 void RenderScrollbarPart::computePreferredLogicalWidths()
130 {
131 if (!preferredLogicalWidthsDirty())
132 return;
133
134 m_minPreferredLogicalWidth = m_maxPreferredLogicalWidth = 0;
135
136 clearPreferredLogicalWidthsDirty();
137 }
138
styleWillChange(StyleDifference diff,const RenderStyle & newStyle)139 void RenderScrollbarPart::styleWillChange(StyleDifference diff, const RenderStyle& newStyle)
140 {
141 RenderBlock::styleWillChange(diff, newStyle);
142 setInline(false);
143 }
144
styleDidChange(StyleDifference diff,const RenderStyle * oldStyle)145 void RenderScrollbarPart::styleDidChange(StyleDifference diff, const RenderStyle* oldStyle)
146 {
147 RenderBlock::styleDidChange(diff, oldStyle);
148 setInline(false);
149 clearPositionedState();
150 setFloating(false);
151 setHasOverflowClip(false);
152 if (oldStyle && m_scrollbar && m_part != NoPart && (diff.needsPaintInvalidation() || diff.needsLayout()))
153 m_scrollbar->theme()->invalidatePart(m_scrollbar, m_part);
154 }
155
imageChanged(WrappedImagePtr image,const IntRect * rect)156 void RenderScrollbarPart::imageChanged(WrappedImagePtr image, const IntRect* rect)
157 {
158 if (m_scrollbar && m_part != NoPart)
159 m_scrollbar->theme()->invalidatePart(m_scrollbar, m_part);
160 else {
161 if (FrameView* frameView = view()->frameView()) {
162 if (frameView->isFrameViewScrollCorner(this)) {
163 frameView->invalidateScrollCorner(frameView->scrollCornerRect());
164 return;
165 }
166 }
167
168 RenderBlock::imageChanged(image, rect);
169 }
170 }
171
paintIntoRect(GraphicsContext * graphicsContext,const LayoutPoint & paintOffset,const LayoutRect & rect)172 void RenderScrollbarPart::paintIntoRect(GraphicsContext* graphicsContext, const LayoutPoint& paintOffset, const LayoutRect& rect)
173 {
174 // Make sure our dimensions match the rect.
175 setLocation(rect.location() - toSize(paintOffset));
176 setWidth(rect.width());
177 setHeight(rect.height());
178
179 // Now do the paint.
180 PaintInfo paintInfo(graphicsContext, pixelSnappedIntRect(rect), PaintPhaseBlockBackground, PaintBehaviorNormal);
181 paint(paintInfo, paintOffset);
182 paintInfo.phase = PaintPhaseChildBlockBackgrounds;
183 paint(paintInfo, paintOffset);
184 paintInfo.phase = PaintPhaseFloat;
185 paint(paintInfo, paintOffset);
186 paintInfo.phase = PaintPhaseForeground;
187 paint(paintInfo, paintOffset);
188 paintInfo.phase = PaintPhaseOutline;
189 paint(paintInfo, paintOffset);
190 }
191
rendererOwningScrollbar() const192 RenderObject* RenderScrollbarPart::rendererOwningScrollbar() const
193 {
194 if (!m_scrollbar)
195 return 0;
196 return m_scrollbar->owningRenderer();
197 }
198
199 }
200