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