third_party/WebKit/Source/core/layout/LayoutScrollbarTheme.cpp

   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/layout/LayoutScrollbarTheme.h"
  28
  29 #include "core/layout/LayoutScrollbar.h"
  30 #include "core/paint/ScrollbarPainter.h"
  31 #include "platform/graphics/GraphicsContext.h"
  32 #include "platform/graphics/paint/DrawingRecorder.h"
  33 #include "platform/scroll/ScrollbarThemeClient.h"
  34 #include "wtf/StdLibExtras.h"
  35
  36 namespace blink {
  37
  38 LayoutScrollbarTheme* LayoutScrollbarTheme::layoutScrollbarTheme()
  39 {
  40     DEFINE_STATIC_LOCAL(LayoutScrollbarTheme, theme, ());
  41     return &theme;
  42 }
  43
  44 void LayoutScrollbarTheme::buttonSizesAlongTrackAxis(ScrollbarThemeClient* scrollbar, int& beforeSize, int& afterSize)
  45 {
  46     IntRect firstButton = backButtonRect(scrollbar, BackButtonStartPart);
  47     IntRect secondButton = forwardButtonRect(scrollbar, ForwardButtonStartPart);
  48     IntRect thirdButton = backButtonRect(scrollbar, BackButtonEndPart);
  49     IntRect fourthButton = forwardButtonRect(scrollbar, ForwardButtonEndPart);
  50     if (scrollbar->orientation() == HorizontalScrollbar) {
  51         beforeSize = firstButton.width() + secondButton.width();
  52         afterSize = thirdButton.width() + fourthButton.width();
  53     } else {
  54         beforeSize = firstButton.height() + secondButton.height();
  55         afterSize = thirdButton.height() + fourthButton.height();
  56     }
  57 }
  58
  59 bool LayoutScrollbarTheme::hasButtons(ScrollbarThemeClient* scrollbar)
  60 {
  61     int startSize;
  62     int endSize;
  63     buttonSizesAlongTrackAxis(scrollbar, startSize, endSize);
  64     return (startSize + endSize) <= (scrollbar->orientation() == HorizontalScrollbar ? scrollbar->width() : scrollbar->height());
  65 }
  66
  67 bool LayoutScrollbarTheme::hasThumb(ScrollbarThemeClient* scrollbar)
  68 {
  69     return trackLength(scrollbar) - thumbLength(scrollbar) >= 0;
  70 }
  71
  72 int LayoutScrollbarTheme::minimumThumbLength(ScrollbarThemeClient* scrollbar)
  73 {
  74     return toLayoutScrollbar(scrollbar)->minimumThumbLength();
  75 }
  76
  77 IntRect LayoutScrollbarTheme::backButtonRect(ScrollbarThemeClient* scrollbar, ScrollbarPart partType, bool)
  78 {
  79     return toLayoutScrollbar(scrollbar)->buttonRect(partType);
  80 }
  81
  82 IntRect LayoutScrollbarTheme::forwardButtonRect(ScrollbarThemeClient* scrollbar, ScrollbarPart partType, bool)
  83 {
  84     return toLayoutScrollbar(scrollbar)->buttonRect(partType);
  85 }
  86
  87 IntRect LayoutScrollbarTheme::trackRect(ScrollbarThemeClient* scrollbar, bool)
  88 {
  89     if (!hasButtons(scrollbar))
  90         return scrollbar->frameRect();
  91
  92     int startLength;
  93     int endLength;
  94     buttonSizesAlongTrackAxis(scrollbar, startLength, endLength);
  95
  96     return toLayoutScrollbar(scrollbar)->trackRect(startLength, endLength);
  97 }
  98
  99 IntRect LayoutScrollbarTheme::constrainTrackRectToTrackPieces(ScrollbarThemeClient* scrollbar, const IntRect& rect)
 100 {
 101     IntRect backRect = toLayoutScrollbar(scrollbar)->trackPieceRectWithMargins(BackTrackPart, rect);
 102     IntRect forwardRect = toLayoutScrollbar(scrollbar)->trackPieceRectWithMargins(ForwardTrackPart, rect);
 103     IntRect result = rect;
 104     if (scrollbar->orientation() == HorizontalScrollbar) {
 105         result.setX(backRect.x());
 106         result.setWidth(forwardRect.maxX() - backRect.x());
 107     } else {
 108         result.setY(backRect.y());
 109         result.setHeight(forwardRect.maxY() - backRect.y());
 110     }
 111     return result;
 112 }
 113
 114 void LayoutScrollbarTheme::paintScrollCorner(GraphicsContext* context, const DisplayItemClientWrapper& displayItemClient, const IntRect& cornerRect)
 115 {
 116     if (DrawingRecorder::useCachedDrawingIfPossible(*context, displayItemClient, DisplayItem::ScrollbarCorner))
 117         return;
 118
 119     DrawingRecorder recorder(*context, displayItemClient, DisplayItem::ScrollbarCorner, cornerRect);
 120     // FIXME: Implement.
 121     context->fillRect(cornerRect, Color::white);
 122 }
 123
 124 void LayoutScrollbarTheme::paintScrollbarBackground(GraphicsContext* context, ScrollbarThemeClient* scrollbar)
 125 {
 126     ScrollbarPainter(*toLayoutScrollbar(scrollbar)).paintPart(context, ScrollbarBGPart, scrollbar->frameRect());
 127 }
 128
 129 void LayoutScrollbarTheme::paintTrackBackground(GraphicsContext* context, ScrollbarThemeClient* scrollbar, const IntRect& rect)
 130 {
 131     ScrollbarPainter(*toLayoutScrollbar(scrollbar)).paintPart(context, TrackBGPart, rect);
 132 }
 133
 134 void LayoutScrollbarTheme::paintTrackPiece(GraphicsContext* context, ScrollbarThemeClient* scrollbar, const IntRect& rect, ScrollbarPart part)
 135 {
 136     ScrollbarPainter(*toLayoutScrollbar(scrollbar)).paintPart(context, part, rect);
 137 }
 138
 139 void LayoutScrollbarTheme::paintButton(GraphicsContext* context, ScrollbarThemeClient* scrollbar, const IntRect& rect, ScrollbarPart part)
 140 {
 141     ScrollbarPainter(*toLayoutScrollbar(scrollbar)).paintPart(context, part, rect);
 142 }
 143
 144 void LayoutScrollbarTheme::paintThumb(GraphicsContext* context, ScrollbarThemeClient* scrollbar, const IntRect& rect)
 145 {
 146     ScrollbarPainter(*toLayoutScrollbar(scrollbar)).paintPart(context, ThumbPart, rect);
 147 }
 148
 149 void LayoutScrollbarTheme::paintTickmarks(GraphicsContext* context, ScrollbarThemeClient* scrollbar, const IntRect& rect)
 150 {
 151     ScrollbarTheme::theme()->paintTickmarks(context, scrollbar, rect);
 152 }
 153
 154 }