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      1 /*
      2  * This file is part of the select element renderer in WebCore.
      3  *
      4  * Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies).
      5  * Copyright (C) 2006, 2007, 2008, 2009, 2010, 2011 Apple Inc. All rights reserved.
      6  *               2009 Torch Mobile Inc. All rights reserved. (http://www.torchmobile.com/)
      7  *
      8  * This library is free software; you can redistribute it and/or
      9  * modify it under the terms of the GNU Library General Public
     10  * License as published by the Free Software Foundation; either
     11  * version 2 of the License, or (at your option) any later version.
     12  *
     13  * This library is distributed in the hope that it will be useful,
     14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
     15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
     16  * Library General Public License for more details.
     17  *
     18  * You should have received a copy of the GNU Library General Public License
     19  * along with this library; see the file COPYING.LIB.  If not, write to
     20  * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
     21  * Boston, MA 02110-1301, USA.
     22  *
     23  */
     24 
     25 #include "config.h"
     26 #include "core/rendering/RenderMenuList.h"
     27 
     28 #include "core/HTMLNames.h"
     29 #include "core/accessibility/AXMenuList.h"
     30 #include "core/accessibility/AXObjectCache.h"
     31 #include "core/css/CSSFontSelector.h"
     32 #include "core/css/resolver/StyleResolver.h"
     33 #include "core/dom/NodeRenderStyle.h"
     34 #include "core/frame/FrameHost.h"
     35 #include "core/frame/FrameView.h"
     36 #include "core/frame/LocalFrame.h"
     37 #include "core/frame/Settings.h"
     38 #include "core/html/HTMLOptGroupElement.h"
     39 #include "core/html/HTMLOptionElement.h"
     40 #include "core/html/HTMLSelectElement.h"
     41 #include "core/page/Chrome.h"
     42 #include "core/rendering/RenderBR.h"
     43 #include "core/rendering/RenderScrollbar.h"
     44 #include "core/rendering/RenderTheme.h"
     45 #include "core/rendering/RenderView.h"
     46 #include "platform/fonts/FontCache.h"
     47 #include "platform/geometry/IntSize.h"
     48 #include "platform/text/PlatformLocale.h"
     49 #include <math.h>
     50 
     51 namespace blink {
     52 
     53 using namespace HTMLNames;
     54 
     55 RenderMenuList::RenderMenuList(Element* element)
     56     : RenderFlexibleBox(element)
     57     , m_buttonText(nullptr)
     58     , m_innerBlock(nullptr)
     59     , m_optionsChanged(true)
     60     , m_optionsWidth(0)
     61     , m_lastActiveIndex(-1)
     62     , m_popupIsVisible(false)
     63 {
     64     ASSERT(isHTMLSelectElement(element));
     65 }
     66 
     67 RenderMenuList::~RenderMenuList()
     68 {
     69     ASSERT(!m_popup);
     70 }
     71 
     72 void RenderMenuList::destroy()
     73 {
     74     if (m_popup)
     75         m_popup->disconnectClient();
     76     m_popup = nullptr;
     77     RenderFlexibleBox::destroy();
     78 }
     79 
     80 void RenderMenuList::trace(Visitor* visitor)
     81 {
     82     visitor->trace(m_buttonText);
     83     visitor->trace(m_innerBlock);
     84     visitor->trace(m_popup);
     85     RenderFlexibleBox::trace(visitor);
     86 }
     87 
     88 // FIXME: Instead of this hack we should add a ShadowRoot to <select> with no insertion point
     89 // to prevent children from rendering.
     90 bool RenderMenuList::isChildAllowed(RenderObject* object, RenderStyle*) const
     91 {
     92     return object->isAnonymous() && !object->isRenderFullScreen();
     93 }
     94 
     95 void RenderMenuList::createInnerBlock()
     96 {
     97     if (m_innerBlock) {
     98         ASSERT(firstChild() == m_innerBlock);
     99         ASSERT(!m_innerBlock->nextSibling());
    100         return;
    101     }
    102 
    103     // Create an anonymous block.
    104     ASSERT(!firstChild());
    105     m_innerBlock = createAnonymousBlock();
    106     adjustInnerStyle();
    107     RenderFlexibleBox::addChild(m_innerBlock);
    108 }
    109 
    110 void RenderMenuList::adjustInnerStyle()
    111 {
    112     RenderStyle* innerStyle = m_innerBlock->style();
    113     innerStyle->setFlexGrow(1);
    114     innerStyle->setFlexShrink(1);
    115     // Use margin:auto instead of align-items:center to get safe centering, i.e.
    116     // when the content overflows, treat it the same as align-items: flex-start.
    117     // But we only do that for the cases where html.css would otherwise use center.
    118     if (style()->alignItems() == ItemPositionCenter) {
    119         innerStyle->setMarginTop(Length());
    120         innerStyle->setMarginBottom(Length());
    121         innerStyle->setAlignSelf(ItemPositionFlexStart);
    122     }
    123 
    124     innerStyle->setPaddingLeft(Length(RenderTheme::theme().popupInternalPaddingLeft(style()), Fixed));
    125     innerStyle->setPaddingRight(Length(RenderTheme::theme().popupInternalPaddingRight(style()), Fixed));
    126     innerStyle->setPaddingTop(Length(RenderTheme::theme().popupInternalPaddingTop(style()), Fixed));
    127     innerStyle->setPaddingBottom(Length(RenderTheme::theme().popupInternalPaddingBottom(style()), Fixed));
    128 
    129     if (m_optionStyle) {
    130         if ((m_optionStyle->direction() != innerStyle->direction() || m_optionStyle->unicodeBidi() != innerStyle->unicodeBidi()))
    131             m_innerBlock->setNeedsLayoutAndPrefWidthsRecalcAndFullPaintInvalidation();
    132         innerStyle->setTextAlign(style()->isLeftToRightDirection() ? LEFT : RIGHT);
    133         innerStyle->setDirection(m_optionStyle->direction());
    134         innerStyle->setUnicodeBidi(m_optionStyle->unicodeBidi());
    135     }
    136 }
    137 
    138 inline HTMLSelectElement* RenderMenuList::selectElement() const
    139 {
    140     return toHTMLSelectElement(node());
    141 }
    142 
    143 void RenderMenuList::addChild(RenderObject* newChild, RenderObject* beforeChild)
    144 {
    145     createInnerBlock();
    146     m_innerBlock->addChild(newChild, beforeChild);
    147     ASSERT(m_innerBlock == firstChild());
    148 
    149     if (AXObjectCache* cache = document().existingAXObjectCache())
    150         cache->childrenChanged(this);
    151 }
    152 
    153 void RenderMenuList::removeChild(RenderObject* oldChild)
    154 {
    155     if (oldChild == m_innerBlock || !m_innerBlock) {
    156         RenderFlexibleBox::removeChild(oldChild);
    157         m_innerBlock = nullptr;
    158     } else
    159         m_innerBlock->removeChild(oldChild);
    160 }
    161 
    162 void RenderMenuList::styleDidChange(StyleDifference diff, const RenderStyle* oldStyle)
    163 {
    164     RenderBlock::styleDidChange(diff, oldStyle);
    165 
    166     if (m_buttonText)
    167         m_buttonText->setStyle(style());
    168     if (m_innerBlock) // RenderBlock handled updating the anonymous block's style.
    169         adjustInnerStyle();
    170 
    171     bool fontChanged = !oldStyle || oldStyle->font() != style()->font();
    172     if (fontChanged)
    173         updateOptionsWidth();
    174 }
    175 
    176 void RenderMenuList::updateOptionsWidth()
    177 {
    178     float maxOptionWidth = 0;
    179     const WillBeHeapVector<RawPtrWillBeMember<HTMLElement> >& listItems = selectElement()->listItems();
    180     int size = listItems.size();
    181     FontCachePurgePreventer fontCachePurgePreventer;
    182 
    183     for (int i = 0; i < size; ++i) {
    184         HTMLElement* element = listItems[i];
    185         if (!isHTMLOptionElement(*element))
    186             continue;
    187 
    188         String text = toHTMLOptionElement(element)->textIndentedToRespectGroupLabel();
    189         applyTextTransform(style(), text, ' ');
    190         if (RenderTheme::theme().popupOptionSupportsTextIndent()) {
    191             // Add in the option's text indent.  We can't calculate percentage values for now.
    192             float optionWidth = 0;
    193             if (RenderStyle* optionStyle = element->renderStyle())
    194                 optionWidth += minimumValueForLength(optionStyle->textIndent(), 0);
    195             if (!text.isEmpty())
    196                 optionWidth += style()->font().width(text);
    197             maxOptionWidth = std::max(maxOptionWidth, optionWidth);
    198         } else if (!text.isEmpty()) {
    199             maxOptionWidth = std::max(maxOptionWidth, style()->font().width(text));
    200         }
    201     }
    202 
    203     int width = static_cast<int>(ceilf(maxOptionWidth));
    204     if (m_optionsWidth == width)
    205         return;
    206 
    207     m_optionsWidth = width;
    208     if (parent())
    209         setNeedsLayoutAndPrefWidthsRecalcAndFullPaintInvalidation();
    210 }
    211 
    212 void RenderMenuList::updateFromElement()
    213 {
    214     if (m_optionsChanged) {
    215         updateOptionsWidth();
    216         m_optionsChanged = false;
    217     }
    218 
    219     if (m_popupIsVisible) {
    220         m_popup->updateFromElement();
    221     } else {
    222         if (selectElement()->suggestedIndex() >= 0)
    223             setTextFromOption(selectElement()->suggestedIndex());
    224         else
    225             setTextFromOption(selectElement()->selectedIndex());
    226     }
    227 }
    228 
    229 void RenderMenuList::setTextFromOption(int optionIndex)
    230 {
    231     HTMLSelectElement* select = selectElement();
    232     const WillBeHeapVector<RawPtrWillBeMember<HTMLElement> >& listItems = select->listItems();
    233     const int size = listItems.size();
    234 
    235     String text = emptyString();
    236     m_optionStyle.clear();
    237 
    238     if (multiple()) {
    239         unsigned selectedCount = 0;
    240         int firstSelectedIndex = -1;
    241         for (int i = 0; i < size; ++i) {
    242             Element* element = listItems[i];
    243             if (!isHTMLOptionElement(*element))
    244                 continue;
    245 
    246             if (toHTMLOptionElement(element)->selected()) {
    247                 if (++selectedCount == 1)
    248                     firstSelectedIndex = i;
    249             }
    250         }
    251 
    252         if (selectedCount == 1) {
    253             ASSERT(0 <= firstSelectedIndex);
    254             ASSERT(firstSelectedIndex < size);
    255             HTMLOptionElement* selectedOptionElement = toHTMLOptionElement(listItems[firstSelectedIndex]);
    256             ASSERT(selectedOptionElement->selected());
    257             text = selectedOptionElement->textIndentedToRespectGroupLabel();
    258             m_optionStyle = selectedOptionElement->renderStyle();
    259         } else {
    260             Locale& locale = select->locale();
    261             String localizedNumberString = locale.convertToLocalizedNumber(String::number(selectedCount));
    262             text = locale.queryString(WebLocalizedString::SelectMenuListText, localizedNumberString);
    263             ASSERT(!m_optionStyle);
    264         }
    265     } else {
    266         const int i = select->optionToListIndex(optionIndex);
    267         if (i >= 0 && i < size) {
    268             Element* element = listItems[i];
    269             if (isHTMLOptionElement(*element)) {
    270                 text = toHTMLOptionElement(element)->textIndentedToRespectGroupLabel();
    271                 m_optionStyle = element->renderStyle();
    272             }
    273         }
    274     }
    275 
    276     setText(text.stripWhiteSpace());
    277 
    278     didUpdateActiveOption(optionIndex);
    279 }
    280 
    281 void RenderMenuList::setText(const String& s)
    282 {
    283     if (s.isEmpty()) {
    284         if (!m_buttonText || !m_buttonText->isBR()) {
    285             // FIXME: We should not modify the structure of the render tree
    286             // during layout. crbug.com/370462
    287             DeprecatedDisableModifyRenderTreeStructureAsserts disabler;
    288             if (m_buttonText)
    289                 m_buttonText->destroy();
    290             m_buttonText = new RenderBR(&document());
    291             m_buttonText->setStyle(style());
    292             addChild(m_buttonText);
    293         }
    294     } else {
    295         if (m_buttonText && !m_buttonText->isBR())
    296             m_buttonText->setText(s.impl(), true);
    297         else {
    298             // FIXME: We should not modify the structure of the render tree
    299             // during layout. crbug.com/370462
    300             DeprecatedDisableModifyRenderTreeStructureAsserts disabler;
    301             if (m_buttonText)
    302                 m_buttonText->destroy();
    303             m_buttonText = new RenderText(&document(), s.impl());
    304             m_buttonText->setStyle(style());
    305             // We need to set the text explicitly though it was specified in the
    306             // constructor because RenderText doesn't refer to the text
    307             // specified in the constructor in a case of re-transforming.
    308             m_buttonText->setText(s.impl(), true);
    309             addChild(m_buttonText);
    310         }
    311         adjustInnerStyle();
    312     }
    313 }
    314 
    315 String RenderMenuList::text() const
    316 {
    317     return m_buttonText ? m_buttonText->text() : String();
    318 }
    319 
    320 LayoutRect RenderMenuList::controlClipRect(const LayoutPoint& additionalOffset) const
    321 {
    322     // Clip to the intersection of the content box and the content box for the inner box
    323     // This will leave room for the arrows which sit in the inner box padding,
    324     // and if the inner box ever spills out of the outer box, that will get clipped too.
    325     LayoutRect outerBox(additionalOffset.x() + borderLeft() + paddingLeft(),
    326                    additionalOffset.y() + borderTop() + paddingTop(),
    327                    contentWidth(),
    328                    contentHeight());
    329 
    330     LayoutRect innerBox(additionalOffset.x() + m_innerBlock->x() + m_innerBlock->paddingLeft(),
    331                    additionalOffset.y() + m_innerBlock->y() + m_innerBlock->paddingTop(),
    332                    m_innerBlock->contentWidth(),
    333                    m_innerBlock->contentHeight());
    334 
    335     return intersection(outerBox, innerBox);
    336 }
    337 
    338 void RenderMenuList::computeIntrinsicLogicalWidths(LayoutUnit& minLogicalWidth, LayoutUnit& maxLogicalWidth) const
    339 {
    340     maxLogicalWidth = std::max(m_optionsWidth, RenderTheme::theme().minimumMenuListSize(style())) + m_innerBlock->paddingLeft() + m_innerBlock->paddingRight();
    341     if (!style()->width().isPercent())
    342         minLogicalWidth = maxLogicalWidth;
    343 }
    344 
    345 void RenderMenuList::computePreferredLogicalWidths()
    346 {
    347     m_minPreferredLogicalWidth = 0;
    348     m_maxPreferredLogicalWidth = 0;
    349     RenderStyle* styleToUse = style();
    350 
    351     if (styleToUse->width().isFixed() && styleToUse->width().value() > 0)
    352         m_minPreferredLogicalWidth = m_maxPreferredLogicalWidth = adjustContentBoxLogicalWidthForBoxSizing(styleToUse->width().value());
    353     else
    354         computeIntrinsicLogicalWidths(m_minPreferredLogicalWidth, m_maxPreferredLogicalWidth);
    355 
    356     if (styleToUse->minWidth().isFixed() && styleToUse->minWidth().value() > 0) {
    357         m_maxPreferredLogicalWidth = std::max(m_maxPreferredLogicalWidth, adjustContentBoxLogicalWidthForBoxSizing(styleToUse->minWidth().value()));
    358         m_minPreferredLogicalWidth = std::max(m_minPreferredLogicalWidth, adjustContentBoxLogicalWidthForBoxSizing(styleToUse->minWidth().value()));
    359     }
    360 
    361     if (styleToUse->maxWidth().isFixed()) {
    362         m_maxPreferredLogicalWidth = std::min(m_maxPreferredLogicalWidth, adjustContentBoxLogicalWidthForBoxSizing(styleToUse->maxWidth().value()));
    363         m_minPreferredLogicalWidth = std::min(m_minPreferredLogicalWidth, adjustContentBoxLogicalWidthForBoxSizing(styleToUse->maxWidth().value()));
    364     }
    365 
    366     LayoutUnit toAdd = borderAndPaddingWidth();
    367     m_minPreferredLogicalWidth += toAdd;
    368     m_maxPreferredLogicalWidth += toAdd;
    369 
    370     clearPreferredLogicalWidthsDirty();
    371 }
    372 
    373 void RenderMenuList::showPopup()
    374 {
    375     if (m_popupIsVisible)
    376         return;
    377 
    378     if (document().frameHost()->chrome().hasOpenedPopup())
    379         return;
    380 
    381     // Create m_innerBlock here so it ends up as the first child.
    382     // This is important because otherwise we might try to create m_innerBlock
    383     // inside the showPopup call and it would fail.
    384     createInnerBlock();
    385     if (!m_popup)
    386         m_popup = document().frameHost()->chrome().createPopupMenu(*document().frame(), this);
    387     m_popupIsVisible = true;
    388 
    389     FloatQuad quad(localToAbsoluteQuad(FloatQuad(borderBoundingBox())));
    390     IntSize size = pixelSnappedIntRect(frameRect()).size();
    391     HTMLSelectElement* select = selectElement();
    392     m_popup->show(quad, size, select->optionToListIndex(select->selectedIndex()));
    393 }
    394 
    395 void RenderMenuList::hidePopup()
    396 {
    397     if (m_popup)
    398         m_popup->hide();
    399 }
    400 
    401 void RenderMenuList::valueChanged(unsigned listIndex, bool fireOnChange)
    402 {
    403     // Check to ensure a page navigation has not occurred while
    404     // the popup was up.
    405     Document& doc = toElement(node())->document();
    406     if (&doc != doc.frame()->document())
    407         return;
    408 
    409     HTMLSelectElement* select = selectElement();
    410     select->optionSelectedByUser(select->listToOptionIndex(listIndex), fireOnChange);
    411 }
    412 
    413 void RenderMenuList::listBoxSelectItem(int listIndex, bool allowMultiplySelections, bool shift, bool fireOnChangeNow)
    414 {
    415     selectElement()->listBoxSelectItem(listIndex, allowMultiplySelections, shift, fireOnChangeNow);
    416 }
    417 
    418 bool RenderMenuList::multiple() const
    419 {
    420     return selectElement()->multiple();
    421 }
    422 
    423 void RenderMenuList::didSetSelectedIndex(int listIndex)
    424 {
    425     didUpdateActiveOption(selectElement()->listToOptionIndex(listIndex));
    426 }
    427 
    428 void RenderMenuList::didUpdateActiveOption(int optionIndex)
    429 {
    430     if (!document().existingAXObjectCache())
    431         return;
    432 
    433     if (m_lastActiveIndex == optionIndex)
    434         return;
    435     m_lastActiveIndex = optionIndex;
    436 
    437     HTMLSelectElement* select = selectElement();
    438     int listIndex = select->optionToListIndex(optionIndex);
    439     if (listIndex < 0 || listIndex >= static_cast<int>(select->listItems().size()))
    440         return;
    441     if (AXMenuList* menuList = toAXMenuList(document().axObjectCache()->get(this)))
    442         menuList->didUpdateActiveOption(optionIndex);
    443 }
    444 
    445 String RenderMenuList::itemText(unsigned listIndex) const
    446 {
    447     HTMLSelectElement* select = selectElement();
    448     const WillBeHeapVector<RawPtrWillBeMember<HTMLElement> >& listItems = select->listItems();
    449     if (listIndex >= listItems.size())
    450         return String();
    451 
    452     String itemString;
    453     Element* element = listItems[listIndex];
    454     if (isHTMLOptGroupElement(*element))
    455         itemString = toHTMLOptGroupElement(*element).groupLabelText();
    456     else if (isHTMLOptionElement(*element))
    457         itemString = toHTMLOptionElement(*element).textIndentedToRespectGroupLabel();
    458 
    459     applyTextTransform(style(), itemString, ' ');
    460     return itemString;
    461 }
    462 
    463 String RenderMenuList::itemAccessibilityText(unsigned listIndex) const
    464 {
    465     // Allow the accessible name be changed if necessary.
    466     const WillBeHeapVector<RawPtrWillBeMember<HTMLElement> >& listItems = selectElement()->listItems();
    467     if (listIndex >= listItems.size())
    468         return String();
    469     return listItems[listIndex]->fastGetAttribute(aria_labelAttr);
    470 }
    471 
    472 String RenderMenuList::itemToolTip(unsigned listIndex) const
    473 {
    474     const WillBeHeapVector<RawPtrWillBeMember<HTMLElement> >& listItems = selectElement()->listItems();
    475     if (listIndex >= listItems.size())
    476         return String();
    477     return listItems[listIndex]->title();
    478 }
    479 
    480 bool RenderMenuList::itemIsEnabled(unsigned listIndex) const
    481 {
    482     const WillBeHeapVector<RawPtrWillBeMember<HTMLElement> >& listItems = selectElement()->listItems();
    483     if (listIndex >= listItems.size())
    484         return false;
    485     HTMLElement* element = listItems[listIndex];
    486     if (!isHTMLOptionElement(*element))
    487         return false;
    488 
    489     bool groupEnabled = true;
    490     if (Element* parentElement = element->parentElement()) {
    491         if (isHTMLOptGroupElement(*parentElement))
    492             groupEnabled = !parentElement->isDisabledFormControl();
    493     }
    494     if (!groupEnabled)
    495         return false;
    496 
    497     return !element->isDisabledFormControl();
    498 }
    499 
    500 PopupMenuStyle RenderMenuList::itemStyle(unsigned listIndex) const
    501 {
    502     const WillBeHeapVector<RawPtrWillBeMember<HTMLElement> >& listItems = selectElement()->listItems();
    503     if (listIndex >= listItems.size()) {
    504         // If we are making an out of bounds access, then we want to use the style
    505         // of a different option element (index 0). However, if there isn't an option element
    506         // before at index 0, we fall back to the menu's style.
    507         if (!listIndex)
    508             return menuStyle();
    509 
    510         // Try to retrieve the style of an option element we know exists (index 0).
    511         listIndex = 0;
    512     }
    513     HTMLElement* element = listItems[listIndex];
    514 
    515     Color itemBackgroundColor;
    516     bool itemHasCustomBackgroundColor;
    517     getItemBackgroundColor(listIndex, itemBackgroundColor, itemHasCustomBackgroundColor);
    518 
    519     RenderStyle* style = element->renderStyle() ? element->renderStyle() : element->computedStyle();
    520     return style ? PopupMenuStyle(resolveColor(style, CSSPropertyColor), itemBackgroundColor, style->font(), style->visibility() == VISIBLE,
    521         isHTMLOptionElement(*element) ? toHTMLOptionElement(*element).isDisplayNone() : style->display() == NONE,
    522         style->textIndent(), style->direction(), isOverride(style->unicodeBidi()),
    523         itemHasCustomBackgroundColor ? PopupMenuStyle::CustomBackgroundColor : PopupMenuStyle::DefaultBackgroundColor) : menuStyle();
    524 }
    525 
    526 void RenderMenuList::getItemBackgroundColor(unsigned listIndex, Color& itemBackgroundColor, bool& itemHasCustomBackgroundColor) const
    527 {
    528     const WillBeHeapVector<RawPtrWillBeMember<HTMLElement> >& listItems = selectElement()->listItems();
    529     if (listIndex >= listItems.size()) {
    530         itemBackgroundColor = resolveColor(CSSPropertyBackgroundColor);
    531         itemHasCustomBackgroundColor = false;
    532         return;
    533     }
    534     HTMLElement* element = listItems[listIndex];
    535 
    536     Color backgroundColor;
    537     if (element->renderStyle())
    538         backgroundColor = resolveColor(element->renderStyle(), CSSPropertyBackgroundColor);
    539     itemHasCustomBackgroundColor = backgroundColor.alpha();
    540     // If the item has an opaque background color, return that.
    541     if (!backgroundColor.hasAlpha()) {
    542         itemBackgroundColor = backgroundColor;
    543         return;
    544     }
    545 
    546     // Otherwise, the item's background is overlayed on top of the menu background.
    547     backgroundColor = resolveColor(CSSPropertyBackgroundColor).blend(backgroundColor);
    548     if (!backgroundColor.hasAlpha()) {
    549         itemBackgroundColor = backgroundColor;
    550         return;
    551     }
    552 
    553     // If the menu background is not opaque, then add an opaque white background behind.
    554     itemBackgroundColor = Color(Color::white).blend(backgroundColor);
    555 }
    556 
    557 PopupMenuStyle RenderMenuList::menuStyle() const
    558 {
    559     const RenderObject* o = m_innerBlock ? m_innerBlock.get() : this;
    560     const RenderStyle* s = o->style();
    561     return PopupMenuStyle(o->resolveColor(CSSPropertyColor), o->resolveColor(CSSPropertyBackgroundColor), s->font(), s->visibility() == VISIBLE,
    562         s->display() == NONE, s->textIndent(), style()->direction(), isOverride(style()->unicodeBidi()));
    563 }
    564 
    565 LayoutUnit RenderMenuList::clientPaddingLeft() const
    566 {
    567     return paddingLeft() + m_innerBlock->paddingLeft();
    568 }
    569 
    570 const int endOfLinePadding = 2;
    571 LayoutUnit RenderMenuList::clientPaddingRight() const
    572 {
    573     if (style()->appearance() == MenulistPart || style()->appearance() == MenulistButtonPart) {
    574         // For these appearance values, the theme applies padding to leave room for the
    575         // drop-down button. But leaving room for the button inside the popup menu itself
    576         // looks strange, so we return a small default padding to avoid having a large empty
    577         // space appear on the side of the popup menu.
    578         return endOfLinePadding;
    579     }
    580 
    581     // If the appearance isn't MenulistPart, then the select is styled (non-native), so
    582     // we want to return the user specified padding.
    583     return paddingRight() + m_innerBlock->paddingRight();
    584 }
    585 
    586 int RenderMenuList::listSize() const
    587 {
    588     return selectElement()->listItems().size();
    589 }
    590 
    591 int RenderMenuList::selectedIndex() const
    592 {
    593     HTMLSelectElement* select = selectElement();
    594     return select->optionToListIndex(select->selectedIndex());
    595 }
    596 
    597 void RenderMenuList::popupDidHide()
    598 {
    599     m_popupIsVisible = false;
    600     // Ensure the text is updated which wasn't updated when the popup is visible.
    601     updateFromElement();
    602 }
    603 
    604 bool RenderMenuList::itemIsSeparator(unsigned listIndex) const
    605 {
    606     const WillBeHeapVector<RawPtrWillBeMember<HTMLElement> >& listItems = selectElement()->listItems();
    607     return listIndex < listItems.size() && isHTMLHRElement(*listItems[listIndex]);
    608 }
    609 
    610 bool RenderMenuList::itemIsLabel(unsigned listIndex) const
    611 {
    612     const WillBeHeapVector<RawPtrWillBeMember<HTMLElement> >& listItems = selectElement()->listItems();
    613     return listIndex < listItems.size() && isHTMLOptGroupElement(*listItems[listIndex]);
    614 }
    615 
    616 bool RenderMenuList::itemIsSelected(unsigned listIndex) const
    617 {
    618     const WillBeHeapVector<RawPtrWillBeMember<HTMLElement> >& listItems = selectElement()->listItems();
    619     if (listIndex >= listItems.size())
    620         return false;
    621     HTMLElement* element = listItems[listIndex];
    622     return isHTMLOptionElement(*element) && toHTMLOptionElement(*element).selected();
    623 }
    624 
    625 void RenderMenuList::setTextFromItem(unsigned listIndex)
    626 {
    627     setTextFromOption(selectElement()->listToOptionIndex(listIndex));
    628 }
    629 
    630 } // namespace blink
    631