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/LayoutRectRecorder.h"
30 #include "core/rendering/PaintInfo.h"
31 #include "core/rendering/RenderScrollbar.h"
32 #include "core/rendering/RenderScrollbarTheme.h"
33 #include "core/rendering/RenderView.h"
34
35 using namespace std;
36
37 namespace WebCore {
38
RenderScrollbarPart(RenderScrollbar * scrollbar,ScrollbarPart part)39 RenderScrollbarPart::RenderScrollbarPart(RenderScrollbar* scrollbar, ScrollbarPart part)
40 : RenderBlock(0)
41 , m_scrollbar(scrollbar)
42 , m_part(part)
43 {
44 }
45
~RenderScrollbarPart()46 RenderScrollbarPart::~RenderScrollbarPart()
47 {
48 }
49
createAnonymous(Document * document,RenderScrollbar * scrollbar,ScrollbarPart part)50 RenderScrollbarPart* RenderScrollbarPart::createAnonymous(Document* document, RenderScrollbar* scrollbar, ScrollbarPart part)
51 {
52 RenderScrollbarPart* renderer = new RenderScrollbarPart(scrollbar, part);
53 renderer->setDocumentForAnonymous(document);
54 return renderer;
55 }
56
layout()57 void RenderScrollbarPart::layout()
58 {
59 LayoutRectRecorder recorder(*this);
60 setLocation(LayoutPoint()); // We don't worry about positioning ourselves. We're just determining our minimum width/height.
61 if (m_scrollbar->orientation() == HorizontalScrollbar)
62 layoutHorizontalPart();
63 else
64 layoutVerticalPart();
65
66 clearNeedsLayout();
67 }
68
layoutHorizontalPart()69 void RenderScrollbarPart::layoutHorizontalPart()
70 {
71 if (m_part == ScrollbarBGPart) {
72 setWidth(m_scrollbar->width());
73 computeScrollbarHeight();
74 } else {
75 computeScrollbarWidth();
76 setHeight(m_scrollbar->height());
77 }
78 }
79
layoutVerticalPart()80 void RenderScrollbarPart::layoutVerticalPart()
81 {
82 if (m_part == ScrollbarBGPart) {
83 computeScrollbarWidth();
84 setHeight(m_scrollbar->height());
85 } else {
86 setWidth(m_scrollbar->width());
87 computeScrollbarHeight();
88 }
89 }
90
calcScrollbarThicknessUsing(SizeType sizeType,const Length & length,int containingLength,RenderView * renderView)91 static int calcScrollbarThicknessUsing(SizeType sizeType, const Length& length, int containingLength, RenderView* renderView)
92 {
93 if (!length.isIntrinsicOrAuto() || (sizeType == MinSize && length.isAuto()))
94 return minimumValueForLength(length, containingLength, renderView);
95 return ScrollbarTheme::theme()->scrollbarThickness();
96 }
97
computeScrollbarWidth()98 void RenderScrollbarPart::computeScrollbarWidth()
99 {
100 if (!m_scrollbar->owningRenderer())
101 return;
102 RenderView* renderView = view();
103 // FIXME: We are querying layout information but nothing guarantees that it's up-to-date, especially since we are called at style change.
104 // FIXME: Querying the style's border information doesn't work on table cells with collapsing borders.
105 int visibleSize = m_scrollbar->owningRenderer()->width() - m_scrollbar->owningRenderer()->style()->borderLeftWidth() - m_scrollbar->owningRenderer()->style()->borderRightWidth();
106 int w = calcScrollbarThicknessUsing(MainOrPreferredSize, style()->width(), visibleSize, renderView);
107 int minWidth = calcScrollbarThicknessUsing(MinSize, style()->minWidth(), visibleSize, renderView);
108 int maxWidth = style()->maxWidth().isUndefined() ? w : calcScrollbarThicknessUsing(MaxSize, style()->maxWidth(), visibleSize, renderView);
109 setWidth(max(minWidth, min(maxWidth, w)));
110
111 // Buttons and track pieces can all have margins along the axis of the scrollbar.
112 m_marginBox.setLeft(minimumValueForLength(style()->marginLeft(), visibleSize, renderView));
113 m_marginBox.setRight(minimumValueForLength(style()->marginRight(), visibleSize, renderView));
114 }
115
computeScrollbarHeight()116 void RenderScrollbarPart::computeScrollbarHeight()
117 {
118 if (!m_scrollbar->owningRenderer())
119 return;
120 RenderView* renderView = view();
121 // FIXME: We are querying layout information but nothing guarantees that it's up-to-date, especially since we are called at style change.
122 // FIXME: Querying the style's border information doesn't work on table cells with collapsing borders.
123 int visibleSize = m_scrollbar->owningRenderer()->height() - m_scrollbar->owningRenderer()->style()->borderTopWidth() - m_scrollbar->owningRenderer()->style()->borderBottomWidth();
124 int h = calcScrollbarThicknessUsing(MainOrPreferredSize, style()->height(), visibleSize, renderView);
125 int minHeight = calcScrollbarThicknessUsing(MinSize, style()->minHeight(), visibleSize, renderView);
126 int maxHeight = style()->maxHeight().isUndefined() ? h : calcScrollbarThicknessUsing(MaxSize, style()->maxHeight(), visibleSize, renderView);
127 setHeight(max(minHeight, min(maxHeight, h)));
128
129 // Buttons and track pieces can all have margins along the axis of the scrollbar.
130 m_marginBox.setTop(minimumValueForLength(style()->marginTop(), visibleSize, renderView));
131 m_marginBox.setBottom(minimumValueForLength(style()->marginBottom(), visibleSize, renderView));
132 }
133
computePreferredLogicalWidths()134 void RenderScrollbarPart::computePreferredLogicalWidths()
135 {
136 if (!preferredLogicalWidthsDirty())
137 return;
138
139 m_minPreferredLogicalWidth = m_maxPreferredLogicalWidth = 0;
140
141 clearPreferredLogicalWidthsDirty();
142 }
143
styleWillChange(StyleDifference diff,const RenderStyle * newStyle)144 void RenderScrollbarPart::styleWillChange(StyleDifference diff, const RenderStyle* newStyle)
145 {
146 RenderBlock::styleWillChange(diff, newStyle);
147 setInline(false);
148 }
149
styleDidChange(StyleDifference diff,const RenderStyle * oldStyle)150 void RenderScrollbarPart::styleDidChange(StyleDifference diff, const RenderStyle* oldStyle)
151 {
152 RenderBlock::styleDidChange(diff, oldStyle);
153 setInline(false);
154 clearPositionedState();
155 setFloating(false);
156 setHasOverflowClip(false);
157 if (oldStyle && m_scrollbar && m_part != NoPart && diff >= StyleDifferenceRepaint)
158 m_scrollbar->theme()->invalidatePart(m_scrollbar, m_part);
159 }
160
imageChanged(WrappedImagePtr image,const IntRect * rect)161 void RenderScrollbarPart::imageChanged(WrappedImagePtr image, const IntRect* rect)
162 {
163 if (m_scrollbar && m_part != NoPart)
164 m_scrollbar->theme()->invalidatePart(m_scrollbar, m_part);
165 else {
166 if (FrameView* frameView = view()->frameView()) {
167 if (frameView->isFrameViewScrollCorner(this)) {
168 frameView->invalidateScrollCorner(frameView->scrollCornerRect());
169 return;
170 }
171 }
172
173 RenderBlock::imageChanged(image, rect);
174 }
175 }
176
paintIntoRect(GraphicsContext * graphicsContext,const LayoutPoint & paintOffset,const LayoutRect & rect)177 void RenderScrollbarPart::paintIntoRect(GraphicsContext* graphicsContext, const LayoutPoint& paintOffset, const LayoutRect& rect)
178 {
179 // Make sure our dimensions match the rect.
180 setLocation(rect.location() - toSize(paintOffset));
181 setWidth(rect.width());
182 setHeight(rect.height());
183
184 if (graphicsContext->paintingDisabled())
185 return;
186
187 // Now do the paint.
188 PaintInfo paintInfo(graphicsContext, pixelSnappedIntRect(rect), PaintPhaseBlockBackground, PaintBehaviorNormal);
189 paint(paintInfo, paintOffset);
190 paintInfo.phase = PaintPhaseChildBlockBackgrounds;
191 paint(paintInfo, paintOffset);
192 paintInfo.phase = PaintPhaseFloat;
193 paint(paintInfo, paintOffset);
194 paintInfo.phase = PaintPhaseForeground;
195 paint(paintInfo, paintOffset);
196 paintInfo.phase = PaintPhaseOutline;
197 paint(paintInfo, paintOffset);
198 }
199
rendererOwningScrollbar() const200 RenderObject* RenderScrollbarPart::rendererOwningScrollbar() const
201 {
202 if (!m_scrollbar)
203 return 0;
204 return m_scrollbar->owningRenderer();
205 }
206
207 }
208