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