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