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 #include "RenderScrollbar.h"
29 #include "RenderScrollbarTheme.h"
30
31 using namespace std;
32
33 namespace WebCore {
34
RenderScrollbarPart(Node * node,RenderScrollbar * scrollbar,ScrollbarPart part)35 RenderScrollbarPart::RenderScrollbarPart(Node* node, RenderScrollbar* scrollbar, ScrollbarPart part)
36 : RenderBlock(node)
37 , m_scrollbar(scrollbar)
38 , m_part(part)
39 {
40 }
41
~RenderScrollbarPart()42 RenderScrollbarPart::~RenderScrollbarPart()
43 {
44 }
45
layout()46 void RenderScrollbarPart::layout()
47 {
48 setLocation(IntPoint()); // We don't worry about positioning ourselves. We're just determining our minimum width/height.
49 if (m_scrollbar->orientation() == HorizontalScrollbar)
50 layoutHorizontalPart();
51 else
52 layoutVerticalPart();
53
54 m_overflowWidth = max(width(), m_overflowWidth);
55 m_overflowHeight = max(height(), m_overflowHeight);
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 int visibleSize = m_scrollbar->owningRenderer()->width() - m_scrollbar->owningRenderer()->borderLeft() - m_scrollbar->owningRenderer()->borderRight();
92 int w = calcScrollbarThicknessUsing(style()->width(), visibleSize);
93 int minWidth = calcScrollbarThicknessUsing(style()->minWidth(), visibleSize);
94 int maxWidth = style()->maxWidth().isUndefined() ? w : calcScrollbarThicknessUsing(style()->maxWidth(), visibleSize);
95 setWidth(max(minWidth, min(maxWidth, w)));
96
97 // Buttons and track pieces can all have margins along the axis of the scrollbar.
98 m_marginLeft = style()->marginLeft().calcMinValue(visibleSize);
99 m_marginRight = style()->marginRight().calcMinValue(visibleSize);
100 }
101
computeScrollbarHeight()102 void RenderScrollbarPart::computeScrollbarHeight()
103 {
104 int visibleSize = m_scrollbar->owningRenderer()->height() - m_scrollbar->owningRenderer()->borderTop() - m_scrollbar->owningRenderer()->borderBottom();
105 int h = calcScrollbarThicknessUsing(style()->height(), visibleSize);
106 int minHeight = calcScrollbarThicknessUsing(style()->minHeight(), visibleSize);
107 int maxHeight = style()->maxHeight().isUndefined() ? h : calcScrollbarThicknessUsing(style()->maxHeight(), visibleSize);
108 setHeight(max(minHeight, min(maxHeight, h)));
109
110 // Buttons and track pieces can all have margins along the axis of the scrollbar.
111 m_marginTop = style()->marginTop().calcMinValue(visibleSize);
112 m_marginBottom = style()->marginBottom().calcMinValue(visibleSize);
113 }
114
calcPrefWidths()115 void RenderScrollbarPart::calcPrefWidths()
116 {
117 if (!prefWidthsDirty())
118 return;
119
120 m_minPrefWidth = m_maxPrefWidth = 0;
121
122 setPrefWidthsDirty(false);
123 }
124
styleWillChange(RenderStyle::Diff diff,const RenderStyle * newStyle)125 void RenderScrollbarPart::styleWillChange(RenderStyle::Diff diff, const RenderStyle* newStyle)
126 {
127 RenderBlock::styleWillChange(diff, newStyle);
128 setInline(false);
129 }
130
styleDidChange(RenderStyle::Diff diff,const RenderStyle * oldStyle)131 void RenderScrollbarPart::styleDidChange(RenderStyle::Diff diff, const RenderStyle* oldStyle)
132 {
133 RenderBlock::styleDidChange(diff, oldStyle);
134 setInline(false);
135 setPositioned(false);
136 setFloating(false);
137 setHasOverflowClip(false);
138 if (oldStyle && m_scrollbar && m_part != NoPart && diff >= RenderStyle::Repaint)
139 m_scrollbar->theme()->invalidatePart(m_scrollbar, m_part);
140 }
141
imageChanged(WrappedImagePtr image,const IntRect * rect)142 void RenderScrollbarPart::imageChanged(WrappedImagePtr image, const IntRect* rect)
143 {
144 if (m_scrollbar && m_part != NoPart)
145 m_scrollbar->theme()->invalidatePart(m_scrollbar, m_part);
146 else
147 RenderBlock::imageChanged(image, rect);
148 }
149
paintIntoRect(GraphicsContext * graphicsContext,int tx,int ty,const IntRect & rect)150 void RenderScrollbarPart::paintIntoRect(GraphicsContext* graphicsContext, int tx, int ty, const IntRect& rect)
151 {
152 // Make sure our dimensions match the rect.
153 setLocation(rect.x() - tx, rect.y() - ty);
154 setWidth(rect.width());
155 setHeight(rect.height());
156 setOverflowWidth(max(rect.width(), overflowWidth()));
157 setOverflowHeight(max(rect.height(), overflowHeight()));
158
159 if (graphicsContext->paintingDisabled())
160 return;
161
162 // Now do the paint.
163 RenderObject::PaintInfo paintInfo(graphicsContext, rect, PaintPhaseBlockBackground, false, 0, 0);
164 paint(paintInfo, tx, ty);
165 paintInfo.phase = PaintPhaseChildBlockBackgrounds;
166 paint(paintInfo, tx, ty);
167 paintInfo.phase = PaintPhaseFloat;
168 paint(paintInfo, tx, ty);
169 paintInfo.phase = PaintPhaseForeground;
170 paint(paintInfo, tx, ty);
171 paintInfo.phase = PaintPhaseOutline;
172 paint(paintInfo, tx, ty);
173 }
174
175 }
176