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 "RenderScrollbarPart.h"
28
29 #include "PaintInfo.h"
30 #include "RenderScrollbar.h"
31 #include "RenderScrollbarTheme.h"
32 #include "RenderView.h"
33
34 using namespace std;
35
36 namespace WebCore {
37
RenderScrollbarPart(Node * node,RenderScrollbar * scrollbar,ScrollbarPart part)38 RenderScrollbarPart::RenderScrollbarPart(Node* node, RenderScrollbar* scrollbar, ScrollbarPart part)
39 : RenderBlock(node)
40 , m_scrollbar(scrollbar)
41 , m_part(part)
42 {
43 }
44
~RenderScrollbarPart()45 RenderScrollbarPart::~RenderScrollbarPart()
46 {
47 }
48
layout()49 void RenderScrollbarPart::layout()
50 {
51 setLocation(IntPoint()); // We don't worry about positioning ourselves. We're just determining our minimum width/height.
52 if (m_scrollbar->orientation() == HorizontalScrollbar)
53 layoutHorizontalPart();
54 else
55 layoutVerticalPart();
56
57 setNeedsLayout(false);
58 }
59
layoutHorizontalPart()60 void RenderScrollbarPart::layoutHorizontalPart()
61 {
62 if (m_part == ScrollbarBGPart) {
63 setWidth(m_scrollbar->width());
64 computeScrollbarHeight();
65 } else {
66 computeScrollbarWidth();
67 setHeight(m_scrollbar->height());
68 }
69 }
70
layoutVerticalPart()71 void RenderScrollbarPart::layoutVerticalPart()
72 {
73 if (m_part == ScrollbarBGPart) {
74 computeScrollbarWidth();
75 setHeight(m_scrollbar->height());
76 } else {
77 setWidth(m_scrollbar->width());
78 computeScrollbarHeight();
79 }
80 }
81
calcScrollbarThicknessUsing(const Length & l,int containingLength)82 static int calcScrollbarThicknessUsing(const Length& l, int containingLength)
83 {
84 if (l.isIntrinsicOrAuto())
85 return ScrollbarTheme::nativeTheme()->scrollbarThickness();
86 return l.calcMinValue(containingLength);
87 }
88
computeScrollbarWidth()89 void RenderScrollbarPart::computeScrollbarWidth()
90 {
91 if (!m_scrollbar->owningRenderer())
92 return;
93 int visibleSize = m_scrollbar->owningRenderer()->width() - m_scrollbar->owningRenderer()->borderLeft() - m_scrollbar->owningRenderer()->borderRight();
94 int w = calcScrollbarThicknessUsing(style()->width(), visibleSize);
95 int minWidth = calcScrollbarThicknessUsing(style()->minWidth(), visibleSize);
96 int maxWidth = style()->maxWidth().isUndefined() ? w : calcScrollbarThicknessUsing(style()->maxWidth(), visibleSize);
97 setWidth(max(minWidth, min(maxWidth, w)));
98
99 // Buttons and track pieces can all have margins along the axis of the scrollbar.
100 m_marginLeft = style()->marginLeft().calcMinValue(visibleSize);
101 m_marginRight = style()->marginRight().calcMinValue(visibleSize);
102 }
103
computeScrollbarHeight()104 void RenderScrollbarPart::computeScrollbarHeight()
105 {
106 if (!m_scrollbar->owningRenderer())
107 return;
108 int visibleSize = m_scrollbar->owningRenderer()->height() - m_scrollbar->owningRenderer()->borderTop() - m_scrollbar->owningRenderer()->borderBottom();
109 int h = calcScrollbarThicknessUsing(style()->height(), visibleSize);
110 int minHeight = calcScrollbarThicknessUsing(style()->minHeight(), visibleSize);
111 int maxHeight = style()->maxHeight().isUndefined() ? h : calcScrollbarThicknessUsing(style()->maxHeight(), visibleSize);
112 setHeight(max(minHeight, min(maxHeight, h)));
113
114 // Buttons and track pieces can all have margins along the axis of the scrollbar.
115 m_marginTop = style()->marginTop().calcMinValue(visibleSize);
116 m_marginBottom = style()->marginBottom().calcMinValue(visibleSize);
117 }
118
computePreferredLogicalWidths()119 void RenderScrollbarPart::computePreferredLogicalWidths()
120 {
121 if (!preferredLogicalWidthsDirty())
122 return;
123
124 m_minPreferredLogicalWidth = m_maxPreferredLogicalWidth = 0;
125
126 setPreferredLogicalWidthsDirty(false);
127 }
128
styleWillChange(StyleDifference diff,const RenderStyle * newStyle)129 void RenderScrollbarPart::styleWillChange(StyleDifference diff, const RenderStyle* newStyle)
130 {
131 RenderBlock::styleWillChange(diff, newStyle);
132 setInline(false);
133 }
134
styleDidChange(StyleDifference diff,const RenderStyle * oldStyle)135 void RenderScrollbarPart::styleDidChange(StyleDifference diff, const RenderStyle* oldStyle)
136 {
137 RenderBlock::styleDidChange(diff, oldStyle);
138 setInline(false);
139 setPositioned(false);
140 setFloating(false);
141 setHasOverflowClip(false);
142 if (oldStyle && m_scrollbar && m_part != NoPart && diff >= StyleDifferenceRepaint)
143 m_scrollbar->theme()->invalidatePart(m_scrollbar, m_part);
144 }
145
imageChanged(WrappedImagePtr image,const IntRect * rect)146 void RenderScrollbarPart::imageChanged(WrappedImagePtr image, const IntRect* rect)
147 {
148 if (m_scrollbar && m_part != NoPart)
149 m_scrollbar->theme()->invalidatePart(m_scrollbar, m_part);
150 else {
151 if (FrameView* frameView = view()->frameView()) {
152 if (frameView->isFrameViewScrollCorner(this)) {
153 frameView->invalidateScrollCorner();
154 return;
155 }
156 }
157
158 RenderBlock::imageChanged(image, rect);
159 }
160 }
161
paintIntoRect(GraphicsContext * graphicsContext,int tx,int ty,const IntRect & rect)162 void RenderScrollbarPart::paintIntoRect(GraphicsContext* graphicsContext, int tx, int ty, const IntRect& rect)
163 {
164 // Make sure our dimensions match the rect.
165 setLocation(rect.x() - tx, rect.y() - ty);
166 setWidth(rect.width());
167 setHeight(rect.height());
168
169 if (graphicsContext->paintingDisabled())
170 return;
171
172 // Now do the paint.
173 PaintInfo paintInfo(graphicsContext, rect, PaintPhaseBlockBackground, false, 0, 0);
174 paint(paintInfo, tx, ty);
175 paintInfo.phase = PaintPhaseChildBlockBackgrounds;
176 paint(paintInfo, tx, ty);
177 paintInfo.phase = PaintPhaseFloat;
178 paint(paintInfo, tx, ty);
179 paintInfo.phase = PaintPhaseForeground;
180 paint(paintInfo, tx, ty);
181 paintInfo.phase = PaintPhaseOutline;
182 paint(paintInfo, tx, ty);
183 }
184
185 }
186