root/Source/core/rendering/RenderScrollbarTheme.cpp

DEFINITIONS

1. renderScrollbarTheme
2. buttonSizesAlongTrackAxis
3. hasButtons
4. hasThumb
5. minimumThumbLength
6. backButtonRect
7. forwardButtonRect
8. trackRect
9. constrainTrackRectToTrackPieces
10. paintScrollCorner
11. paintScrollbarBackground
12. paintTrackBackground
13. paintTrackPiece
14. paintButton
15. paintThumb
16. paintTickmarks

/*
 * Copyright (C) 2008 Apple Inc. All Rights Reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE INC. OR
 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
 * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

#include "config.h"
#include "core/rendering/RenderScrollbar.h"
#include "core/rendering/RenderScrollbarTheme.h"
#include "platform/scroll/ScrollbarThemeClient.h"
#include "wtf/StdLibExtras.h"

namespace WebCore {

RenderScrollbarTheme* RenderScrollbarTheme::renderScrollbarTheme()
{
    DEFINE_STATIC_LOCAL(RenderScrollbarTheme, theme, ());
    return &theme;
}

void RenderScrollbarTheme::buttonSizesAlongTrackAxis(ScrollbarThemeClient* scrollbar, int& beforeSize, int& afterSize)
{
    IntRect firstButton = backButtonRect(scrollbar, BackButtonStartPart);
    IntRect secondButton = forwardButtonRect(scrollbar, ForwardButtonStartPart);
    IntRect thirdButton = backButtonRect(scrollbar, BackButtonEndPart);
    IntRect fourthButton = forwardButtonRect(scrollbar, ForwardButtonEndPart);
    if (scrollbar->orientation() == HorizontalScrollbar) {
        beforeSize = firstButton.width() + secondButton.width();
        afterSize = thirdButton.width() + fourthButton.width();
    } else {
        beforeSize = firstButton.height() + secondButton.height();
        afterSize = thirdButton.height() + fourthButton.height();
    }
}

bool RenderScrollbarTheme::hasButtons(ScrollbarThemeClient* scrollbar)
{
    int startSize;
    int endSize;
    buttonSizesAlongTrackAxis(scrollbar, startSize, endSize);
    return (startSize + endSize) <= (scrollbar->orientation() == HorizontalScrollbar ? scrollbar->width() : scrollbar->height());
}

bool RenderScrollbarTheme::hasThumb(ScrollbarThemeClient* scrollbar)
{
    return trackLength(scrollbar) - thumbLength(scrollbar) >= 0;
}

int RenderScrollbarTheme::minimumThumbLength(ScrollbarThemeClient* scrollbar)
{
    return toRenderScrollbar(scrollbar)->minimumThumbLength();
}

IntRect RenderScrollbarTheme::backButtonRect(ScrollbarThemeClient* scrollbar, ScrollbarPart partType, bool)
{
    return toRenderScrollbar(scrollbar)->buttonRect(partType);
}

IntRect RenderScrollbarTheme::forwardButtonRect(ScrollbarThemeClient* scrollbar, ScrollbarPart partType, bool)
{
    return toRenderScrollbar(scrollbar)->buttonRect(partType);
}

IntRect RenderScrollbarTheme::trackRect(ScrollbarThemeClient* scrollbar, bool)
{
    if (!hasButtons(scrollbar))
        return scrollbar->frameRect();

    int startLength;
    int endLength;
    buttonSizesAlongTrackAxis(scrollbar, startLength, endLength);

    return toRenderScrollbar(scrollbar)->trackRect(startLength, endLength);
}

IntRect RenderScrollbarTheme::constrainTrackRectToTrackPieces(ScrollbarThemeClient* scrollbar, const IntRect& rect)
{
    IntRect backRect = toRenderScrollbar(scrollbar)->trackPieceRectWithMargins(BackTrackPart, rect);
    IntRect forwardRect = toRenderScrollbar(scrollbar)->trackPieceRectWithMargins(ForwardTrackPart, rect);
    IntRect result = rect;
    if (scrollbar->orientation() == HorizontalScrollbar) {
        result.setX(backRect.x());
        result.setWidth(forwardRect.maxX() - backRect.x());
    } else {
        result.setY(backRect.y());
        result.setHeight(forwardRect.maxY() - backRect.y());
    }
    return result;
}

void RenderScrollbarTheme::paintScrollCorner(GraphicsContext* context, const IntRect& cornerRect)
{
    // FIXME: Implement.
    context->fillRect(cornerRect, Color::white);
}

void RenderScrollbarTheme::paintScrollbarBackground(GraphicsContext* context, ScrollbarThemeClient* scrollbar)
{
    toRenderScrollbar(scrollbar)->paintPart(context, ScrollbarBGPart, scrollbar->frameRect());
}

void RenderScrollbarTheme::paintTrackBackground(GraphicsContext* context, ScrollbarThemeClient* scrollbar, const IntRect& rect)
{
    toRenderScrollbar(scrollbar)->paintPart(context, TrackBGPart, rect);
}

void RenderScrollbarTheme::paintTrackPiece(GraphicsContext* context, ScrollbarThemeClient* scrollbar, const IntRect& rect, ScrollbarPart part)
{
    toRenderScrollbar(scrollbar)->paintPart(context, part, rect);
}

void RenderScrollbarTheme::paintButton(GraphicsContext* context, ScrollbarThemeClient* scrollbar, const IntRect& rect, ScrollbarPart part)
{
    toRenderScrollbar(scrollbar)->paintPart(context, part, rect);
}

void RenderScrollbarTheme::paintThumb(GraphicsContext* context, ScrollbarThemeClient* scrollbar, const IntRect& rect)
{
    toRenderScrollbar(scrollbar)->paintPart(context, ThumbPart, rect);
}

void RenderScrollbarTheme::paintTickmarks(GraphicsContext* context, ScrollbarThemeClient* scrollbar, const IntRect& rect)
{
    ScrollbarTheme::theme()->paintTickmarks(context, scrollbar, rect);
}

}