Source/core/rendering/RenderListBox.cpp

/*
 * Copyright (C) 2006, 2007, 2008, 2011 Apple Inc. All rights reserved.
 *               2009 Torch Mobile Inc. All rights reserved. (http://www.torchmobile.com/)
 *
 * 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.
 * 3.  Neither the name of Apple Computer, Inc. ("Apple") nor the names of
 *     its contributors may be used to endorse or promote products derived
 *     from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY APPLE AND ITS CONTRIBUTORS "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
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#include "config.h"
#include "core/rendering/RenderListBox.h"

#include "core/HTMLNames.h"
#include "core/accessibility/AXObjectCache.h"
#include "core/css/CSSFontSelector.h"
#include "core/css/resolver/StyleResolver.h"
#include "core/dom/Document.h"
#include "core/dom/ElementTraversal.h"
#include "core/dom/NodeRenderStyle.h"
#include "core/dom/StyleEngine.h"
#include "core/editing/FrameSelection.h"
#include "core/frame/FrameView.h"
#include "core/frame/LocalFrame.h"
#include "core/html/HTMLDivElement.h"
#include "core/html/HTMLOptGroupElement.h"
#include "core/html/HTMLOptionElement.h"
#include "core/html/HTMLSelectElement.h"
#include "core/page/EventHandler.h"
#include "core/page/FocusController.h"
#include "core/page/Page.h"
#include "core/page/SpatialNavigation.h"
#include "core/rendering/HitTestResult.h"
#include "core/rendering/PaintInfo.h"
#include "core/rendering/RenderLayer.h"
#include "core/rendering/RenderText.h"
#include "core/rendering/RenderTheme.h"
#include "core/rendering/RenderView.h"
#include "core/rendering/TextRunConstructor.h"
#include "platform/fonts/FontCache.h"
#include "platform/graphics/GraphicsContext.h"
#include "platform/text/BidiTextRun.h"
#include <math.h>

namespace blink {

using namespace HTMLNames;

// Default size when the multiple attribute is present but size attribute is absent.
const int defaultSize = 4;

const int defaultPaddingBottom = 1;

RenderListBox::RenderListBox(Element* element)
    : RenderBlockFlow(element)
{
    ASSERT(element);
    ASSERT(element->isHTMLElement());
    ASSERT(isHTMLSelectElement(element));
}

RenderListBox::~RenderListBox()
{
}

inline HTMLSelectElement* RenderListBox::selectElement() const
{
    return toHTMLSelectElement(node());
}

int RenderListBox::size() const
{
    int specifiedSize = selectElement()->size();
    if (specifiedSize >= 1)
        return specifiedSize;

    return defaultSize;
}

LayoutUnit RenderListBox::defaultItemHeight() const
{
    return style()->fontMetrics().height() + defaultPaddingBottom;
}

LayoutUnit RenderListBox::itemHeight() const
{
    HTMLSelectElement* select = selectElement();
    if (!select)
        return 0;
    Element* baseItem = ElementTraversal::firstChild(*select);
    if (!baseItem)
        return defaultItemHeight();
    if (isHTMLOptGroupElement(baseItem))
        baseItem = &toHTMLOptGroupElement(baseItem)->optGroupLabelElement();
    else if (!isHTMLOptionElement(baseItem))
        return defaultItemHeight();
    RenderObject* baseItemRenderer = baseItem->renderer();
    if (!baseItemRenderer)
        return defaultItemHeight();
    if (!baseItemRenderer || !baseItemRenderer->isBox())
        return defaultItemHeight();
    return toRenderBox(baseItemRenderer)->height();
}

void RenderListBox::computeLogicalHeight(LayoutUnit, LayoutUnit logicalTop, LogicalExtentComputedValues& computedValues) const
{
    LayoutUnit height = itemHeight() * size();
    // FIXME: The item height should have been added before updateLogicalHeight was called to avoid this hack.
    updateIntrinsicContentLogicalHeight(height);

    height += borderAndPaddingHeight();

    RenderBox::computeLogicalHeight(height, logicalTop, computedValues);
}

void RenderListBox::stopAutoscroll()
{
    HTMLSelectElement* select = selectElement();
    if (select->isDisabledFormControl())
        return;
    select->handleMouseRelease();
}

void RenderListBox::computeIntrinsicLogicalWidths(LayoutUnit& minLogicalWidth, LayoutUnit& maxLogicalWidth) const
{
    RenderBlockFlow::computeIntrinsicLogicalWidths(minLogicalWidth, maxLogicalWidth);
    if (style()->width().isPercent())
        minLogicalWidth = 0;
}

void RenderListBox::scrollToRect(const LayoutRect& rect)
{
    if (hasOverflowClip()) {
        ASSERT(layer());
        ASSERT(layer()->scrollableArea());
        layer()->scrollableArea()->exposeRect(rect, ScrollAlignment::alignToEdgeIfNeeded, ScrollAlignment::alignToEdgeIfNeeded);
    }
}

} // namespace blink