Button experiment

third_party/WebKit/Source/core/layout/LayoutButton.cpp

 /**
  * Copyright (C) 2005 Apple Computer, Inc.
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
  * License as published by the Free Software Foundation; either
  * version 2 of the License, or (at your option) any later version.
  *
  * This library is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  * Library General Public License for more details.
  *
  * You should have received a copy of the GNU Library General Public License
  * along with this library; see the file COPYING.LIB.  If not, write to
  * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
  * Boston, MA 02110-1301, USA.
  *
  */
 
 #include "core/layout/LayoutButton.h"
 
 namespace blink {
 
 using namespace HTMLNames;
 
 LayoutButton::LayoutButton(Element* element)
-    : LayoutFlexibleBox(element)
+    : LayoutBlockFlow(element)
     , m_inner(nullptr)
 {
 }
 
 LayoutButton::~LayoutButton()
 {
 }
 
 void LayoutButton::addChild(LayoutObject* newChild, LayoutObject* beforeChild)
 {
     if (!m_inner) {
         // Create an anonymous block.
         ASSERT(!firstChild());
         m_inner = createAnonymousBlock(style()->display());
-        LayoutFlexibleBox::addChild(m_inner);
+        LayoutBlockFlow::addChild(m_inner);
     }
 
     m_inner->addChild(newChild, beforeChild);
 }
 
 void LayoutButton::removeChild(LayoutObject* oldChild)
 {
     if (oldChild == m_inner || !m_inner) {
-        LayoutFlexibleBox::removeChild(oldChild);
+        LayoutBlockFlow::removeChild(oldChild);
         m_inner = 0;
 
     } else if (oldChild->parent() == this) {
         // We aren't the inner node, but we're getting removed from the button, this
         // can happen with things like scrollable area resizer's.
-        LayoutFlexibleBox::removeChild(oldChild);
+        LayoutBlockFlow::removeChild(oldChild);
 
     } else {
         m_inner->removeChild(oldChild);
     }
 }
 
 void LayoutButton::updateAnonymousChildStyle(const LayoutObject& child, ComputedStyle& childStyle) const
 {
     ASSERT(!m_inner || &child == m_inner);
 
     childStyle.setFlexGrow(1.0f);
+    childStyle.setHeight(Length(0, FillAvailable));
     // min-width: 0; is needed for correct shrinking.
     childStyle.setMinWidth(Length(0, Fixed));
     // Use margin:auto instead of align-items:center to get safe centering, i.e.
     // when the content overflows, treat it the same as align-items: flex-start.
     childStyle.setMarginTop(Length());
     childStyle.setMarginBottom(Length());
     childStyle.setFlexDirection(style()->flexDirection());
     childStyle.setJustifyContent(style()->justifyContent());
     childStyle.setFlexWrap(style()->flexWrap());
     childStyle.setAlignItems(style()->alignItems());
     childStyle.setAlignContent(style()->alignContent());
 }
 
 LayoutRect LayoutButton::controlClipRect(const LayoutPoint& additionalOffset) const
 {
     // Clip to the padding box to at least give content the extra padding space.
     LayoutRect rect(additionalOffset, size());
     rect.expand(borderInsets());
     return rect;
 }
 
 int LayoutButton::baselinePosition(FontBaseline baseline, bool firstLine, LineDirectionMode direction, LinePositionMode linePositionMode) const
 {
     ASSERT(linePositionMode == PositionOnContainingLine);
     // We want to call the LayoutBlock version of firstLineBoxBaseline to
-    // avoid LayoutFlexibleBox synthesizing a baseline that we don't want.
+    // avoid LayoutBlockFlow synthesizing a baseline that we don't want.
     // We use this check as a proxy for "are there any line boxes in this button"
-    if (!hasLineIfEmpty() && LayoutBlock::firstLineBoxBaseline() == -1) {
+    if (!hasLineIfEmpty() && (!firstChild() || LayoutBlock::firstLineBoxBaseline() == -1)) {
         // To ensure that we have a consistent baseline when we have no children,
         // even when we have the anonymous LayoutBlock child, we calculate the
         // baseline for the empty case manually here.
         if (direction == HorizontalLine) {
             return marginTop() + size().height() - borderBottom() - paddingBottom() - horizontalScrollbarHeight();
         }
         return marginRight() + size().width() - borderLeft() - paddingLeft() - verticalScrollbarWidth();
     }
-    return LayoutFlexibleBox::baselinePosition(baseline, firstLine, direction, linePositionMode);
+    return LayoutBlockFlow::baselinePosition(baseline, firstLine, direction, linePositionMode);
 }
 
 
 // For compatibility with IE/FF we only clip overflow on input elements.
 bool LayoutButton::hasControlClip() const
 {
     return !isHTMLButtonElement(node());
 }
 } // namespace blink