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* 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
* 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 "config.h"
#include "core/rendering/RenderButton.h"
#include "HTMLNames.h"
#include "core/dom/Document.h"
namespace WebCore {
using namespace HTMLNames;
RenderButton::RenderButton(Element* element)
: RenderFlexibleBox(element)
, m_inner(0)
void RenderButton::addChild(RenderObject* newChild, RenderObject* beforeChild)
if (!m_inner) {
// Create an anonymous block.
m_inner = createAnonymousBlock(style()->display());
m_inner->addChild(newChild, beforeChild);
void RenderButton::removeChild(RenderObject* oldChild)
// m_inner should be the only child, but checking for direct children who
// are not m_inner prevents security problems when that assumption is
// violated.
if (oldChild == m_inner || !m_inner || oldChild->parent() == this) {
ASSERT(oldChild == m_inner || !m_inner);
m_inner = 0;
} else
void RenderButton::styleWillChange(StyleDifference diff, const RenderStyle* newStyle)
if (m_inner) {
// RenderBlock::setStyle is going to apply a new style to the inner block, which
// will have the initial flex value, 0. The current value is 1, because we set
// it right below. Here we change it back to 0 to avoid getting a spurious layout hint
// because of the difference. Same goes for the other properties.
// FIXME: Make this hack unnecessary.
RenderBlock::styleWillChange(diff, newStyle);
void RenderButton::styleDidChange(StyleDifference diff, const RenderStyle* oldStyle)
RenderBlock::styleDidChange(diff, oldStyle);
if (m_inner) // RenderBlock handled updating the anonymous block's style.
void RenderButton::setupInnerStyle(RenderStyle* innerStyle)
ASSERT(innerStyle->refCount() == 1);
// RenderBlock::createAnonymousBlock creates a new RenderStyle, so this is
// safe to modify.
// 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.
bool RenderButton::canHaveGeneratedChildren() const
// Input elements can't have generated children, but button elements can. We'll
// write the code assuming any other button types that might emerge in the future
// can also have children.
return !node()->hasTagName(inputTag);
LayoutRect RenderButton::controlClipRect(const LayoutPoint& additionalOffset) const
// Clip to the padding box to at least give content the extra padding space.
return LayoutRect(additionalOffset.x() + borderLeft(), additionalOffset.y() + borderTop(), width() - borderLeft() - borderRight(), height() - borderTop() - borderBottom());
int RenderButton::baselinePosition(FontBaseline baseline, bool firstLine, LineDirectionMode direction, LinePositionMode linePositionMode) const
ASSERT(linePositionMode == PositionOnContainingLine);
// We want to call the RenderBlock version of firstLineBoxBaseline to
// avoid RenderFlexibleBox 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() && RenderBlock::firstLineBoxBaseline() == -1) {
// To ensure that we have a consistent baseline when we have no children,
// even when we have the anonymous RenderBlock child, we calculate the
// baseline for the empty case manually here.
if (direction == HorizontalLine)
return marginTop() + borderTop() + paddingTop() + contentHeight();
return marginRight() + borderRight() + paddingRight() + contentWidth();
return RenderFlexibleBox::baselinePosition(baseline, firstLine, direction, linePositionMode);
} // namespace WebCore