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      1 /*
      2  * Copyright (C) 2006, 2007, 2008, 2011 Apple Inc. All rights reserved.
      3  *               2009 Torch Mobile Inc. All rights reserved. (http://www.torchmobile.com/)
      4  *
      5  * Redistribution and use in source and binary forms, with or without
      6  * modification, are permitted provided that the following conditions
      7  * are met:
      8  *
      9  * 1.  Redistributions of source code must retain the above copyright
     10  *     notice, this list of conditions and the following disclaimer.
     11  * 2.  Redistributions in binary form must reproduce the above copyright
     12  *     notice, this list of conditions and the following disclaimer in the
     13  *     documentation and/or other materials provided with the distribution.
     14  * 3.  Neither the name of Apple Computer, Inc. ("Apple") nor the names of
     15  *     its contributors may be used to endorse or promote products derived
     16  *     from this software without specific prior written permission.
     17  *
     18  * THIS SOFTWARE IS PROVIDED BY APPLE AND ITS CONTRIBUTORS "AS IS" AND ANY
     19  * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
     20  * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
     21  * DISCLAIMED. IN NO EVENT SHALL APPLE OR ITS CONTRIBUTORS BE LIABLE FOR ANY
     22  * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
     23  * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
     24  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
     25  * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     26  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
     27  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     28  */
     29 
     30 #include "config.h"
     31 #include "core/rendering/RenderListBox.h"
     32 
     33 #include "core/HTMLNames.h"
     34 #include "core/accessibility/AXObjectCache.h"
     35 #include "core/css/CSSFontSelector.h"
     36 #include "core/css/resolver/StyleResolver.h"
     37 #include "core/dom/Document.h"
     38 #include "core/dom/ElementTraversal.h"
     39 #include "core/dom/NodeRenderStyle.h"
     40 #include "core/dom/StyleEngine.h"
     41 #include "core/editing/FrameSelection.h"
     42 #include "core/frame/FrameView.h"
     43 #include "core/frame/LocalFrame.h"
     44 #include "core/html/HTMLDivElement.h"
     45 #include "core/html/HTMLOptGroupElement.h"
     46 #include "core/html/HTMLOptionElement.h"
     47 #include "core/html/HTMLSelectElement.h"
     48 #include "core/page/EventHandler.h"
     49 #include "core/page/FocusController.h"
     50 #include "core/page/Page.h"
     51 #include "core/page/SpatialNavigation.h"
     52 #include "core/rendering/HitTestResult.h"
     53 #include "core/rendering/PaintInfo.h"
     54 #include "core/rendering/RenderScrollbar.h"
     55 #include "core/rendering/RenderLayer.h"
     56 #include "core/rendering/RenderText.h"
     57 #include "core/rendering/RenderTheme.h"
     58 #include "core/rendering/RenderView.h"
     59 #include "core/rendering/TextRunConstructor.h"
     60 #include "platform/fonts/FontCache.h"
     61 #include "platform/graphics/GraphicsContext.h"
     62 #include "platform/scroll/Scrollbar.h"
     63 #include "platform/text/BidiTextRun.h"
     64 #include <math.h>
     65 
     66 namespace blink {
     67 
     68 using namespace HTMLNames;
     69 
     70 // Default size when the multiple attribute is present but size attribute is absent.
     71 const int defaultSize = 4;
     72 
     73 const int defaultPaddingBottom = 1;
     74 
     75 RenderListBox::RenderListBox(Element* element)
     76     : RenderBlockFlow(element)
     77 {
     78     ASSERT(element);
     79     ASSERT(element->isHTMLElement());
     80     ASSERT(isHTMLSelectElement(element));
     81 }
     82 
     83 RenderListBox::~RenderListBox()
     84 {
     85 }
     86 
     87 inline HTMLSelectElement* RenderListBox::selectElement() const
     88 {
     89     return toHTMLSelectElement(node());
     90 }
     91 
     92 int RenderListBox::size() const
     93 {
     94     int specifiedSize = selectElement()->size();
     95     if (specifiedSize >= 1)
     96         return specifiedSize;
     97 
     98     return defaultSize;
     99 }
    100 
    101 LayoutUnit RenderListBox::defaultItemHeight() const
    102 {
    103     return style()->fontMetrics().height() + defaultPaddingBottom;
    104 }
    105 
    106 LayoutUnit RenderListBox::itemHeight() const
    107 {
    108     HTMLSelectElement* select = selectElement();
    109     if (!select)
    110         return 0;
    111     Element* baseItem = ElementTraversal::firstChild(*select);
    112     if (!baseItem)
    113         return defaultItemHeight();
    114     if (isHTMLOptGroupElement(baseItem))
    115         baseItem = &toHTMLOptGroupElement(baseItem)->optGroupLabelElement();
    116     else if (!isHTMLOptionElement(baseItem))
    117         return defaultItemHeight();
    118     RenderObject* baseItemRenderer = baseItem->renderer();
    119     if (!baseItemRenderer)
    120         return defaultItemHeight();
    121     if (!baseItemRenderer || !baseItemRenderer->isBox())
    122         return defaultItemHeight();
    123     return toRenderBox(baseItemRenderer)->height();
    124 }
    125 
    126 void RenderListBox::computeLogicalHeight(LayoutUnit, LayoutUnit logicalTop, LogicalExtentComputedValues& computedValues) const
    127 {
    128     LayoutUnit height = itemHeight() * size();
    129     // FIXME: The item height should have been added before updateLogicalHeight was called to avoid this hack.
    130     updateIntrinsicContentLogicalHeight(height);
    131 
    132     height += borderAndPaddingHeight();
    133 
    134     RenderBox::computeLogicalHeight(height, logicalTop, computedValues);
    135 }
    136 
    137 void RenderListBox::stopAutoscroll()
    138 {
    139     HTMLSelectElement* select = selectElement();
    140     if (select->isDisabledFormControl())
    141         return;
    142     select->handleMouseRelease();
    143 }
    144 
    145 void RenderListBox::computeIntrinsicLogicalWidths(LayoutUnit& minLogicalWidth, LayoutUnit& maxLogicalWidth) const
    146 {
    147     RenderBlockFlow::computeIntrinsicLogicalWidths(minLogicalWidth, maxLogicalWidth);
    148     if (style()->width().isPercent())
    149         minLogicalWidth = 0;
    150 }
    151 
    152 void RenderListBox::scrollToRect(const LayoutRect& rect)
    153 {
    154     if (hasOverflowClip()) {
    155         ASSERT(layer());
    156         ASSERT(layer()->scrollableArea());
    157         layer()->scrollableArea()->exposeRect(rect, ScrollAlignment::alignToEdgeIfNeeded, ScrollAlignment::alignToEdgeIfNeeded);
    158     }
    159 }
    160 
    161 } // namespace blink
    162