| /** |
| * 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 "config.h" |
| #include "core/rendering/RenderButton.h" |
| |
| #include "core/dom/Document.h" |
| |
| namespace WebCore { |
| |
| using namespace HTMLNames; |
| |
| RenderButton::RenderButton(Element* element) |
| : RenderFlexibleBox(element) |
| , m_inner(0) |
| { |
| } |
| |
| RenderButton::~RenderButton() |
| { |
| } |
| |
| void RenderButton::addChild(RenderObject* newChild, RenderObject* beforeChild) |
| { |
| if (!m_inner) { |
| // Create an anonymous block. |
| ASSERT(!firstChild()); |
| m_inner = createAnonymousBlock(style()->display()); |
| setupInnerStyle(m_inner->style()); |
| RenderFlexibleBox::addChild(m_inner); |
| } |
| |
| 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); |
| RenderFlexibleBox::removeChild(oldChild); |
| m_inner = 0; |
| } else |
| m_inner->removeChild(oldChild); |
| } |
| |
| 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. |
| m_inner->style()->setFlexGrow(newStyle->initialFlexGrow()); |
| m_inner->style()->setMarginTop(newStyle->initialMargin()); |
| m_inner->style()->setMarginBottom(newStyle->initialMargin()); |
| } |
| 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. |
| setupInnerStyle(m_inner->style()); |
| } |
| |
| void RenderButton::setupInnerStyle(RenderStyle* innerStyle) |
| { |
| ASSERT(innerStyle->refCount() == 1); |
| // RenderBlock::createAnonymousBlock creates a new RenderStyle, so this is |
| // safe to modify. |
| innerStyle->setFlexGrow(1.0f); |
| // 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. |
| innerStyle->setMarginTop(Length()); |
| innerStyle->setMarginBottom(Length()); |
| innerStyle->setFlexDirection(style()->flexDirection()); |
| } |
| |
| 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 |