1 /** 2 * Copyright (C) 2005 Apple Computer, Inc. 3 * 4 * This library is free software; you can redistribute it and/or 5 * modify it under the terms of the GNU Library General Public 6 * License as published by the Free Software Foundation; either 7 * version 2 of the License, or (at your option) any later version. 8 * 9 * This library is distributed in the hope that it will be useful, 10 * but WITHOUT ANY WARRANTY; without even the implied warranty of 11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 12 * Library General Public License for more details. 13 * 14 * You should have received a copy of the GNU Library General Public License 15 * along with this library; see the file COPYING.LIB. If not, write to 16 * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, 17 * Boston, MA 02110-1301, USA. 18 * 19 */ 20 21 #include "config.h" 22 #include "core/rendering/RenderButton.h" 23 24 #include "core/dom/Document.h" 25 26 namespace WebCore { 27 28 using namespace HTMLNames; 29 30 RenderButton::RenderButton(Element* element) 31 : RenderFlexibleBox(element) 32 , m_inner(0) 33 { 34 } 35 36 RenderButton::~RenderButton() 37 { 38 } 39 40 void RenderButton::addChild(RenderObject* newChild, RenderObject* beforeChild) 41 { 42 if (!m_inner) { 43 // Create an anonymous block. 44 ASSERT(!firstChild()); 45 m_inner = createAnonymousBlock(style()->display()); 46 setupInnerStyle(m_inner->style()); 47 RenderFlexibleBox::addChild(m_inner); 48 } 49 50 m_inner->addChild(newChild, beforeChild); 51 } 52 53 void RenderButton::removeChild(RenderObject* oldChild) 54 { 55 // m_inner should be the only child, but checking for direct children who 56 // are not m_inner prevents security problems when that assumption is 57 // violated. 58 if (oldChild == m_inner || !m_inner || oldChild->parent() == this) { 59 ASSERT(oldChild == m_inner || !m_inner); 60 RenderFlexibleBox::removeChild(oldChild); 61 m_inner = 0; 62 } else 63 m_inner->removeChild(oldChild); 64 } 65 66 void RenderButton::styleWillChange(StyleDifference diff, const RenderStyle& newStyle) 67 { 68 if (m_inner) { 69 // RenderBlock::setStyle is going to apply a new style to the inner block, which 70 // will have the initial flex value, 0. The current value is 1, because we set 71 // it right below. Here we change it back to 0 to avoid getting a spurious layout hint 72 // because of the difference. Same goes for the other properties. 73 // FIXME: Make this hack unnecessary. 74 m_inner->style()->setFlexGrow(newStyle.initialFlexGrow()); 75 m_inner->style()->setMarginTop(newStyle.initialMargin()); 76 m_inner->style()->setMarginBottom(newStyle.initialMargin()); 77 } 78 RenderBlock::styleWillChange(diff, newStyle); 79 } 80 81 void RenderButton::styleDidChange(StyleDifference diff, const RenderStyle* oldStyle) 82 { 83 RenderBlock::styleDidChange(diff, oldStyle); 84 85 if (m_inner) // RenderBlock handled updating the anonymous block's style. 86 setupInnerStyle(m_inner->style()); 87 } 88 89 void RenderButton::setupInnerStyle(RenderStyle* innerStyle) 90 { 91 ASSERT(innerStyle->refCount() == 1); 92 // RenderBlock::createAnonymousBlock creates a new RenderStyle, so this is 93 // safe to modify. 94 innerStyle->setFlexGrow(1.0f); 95 // Use margin:auto instead of align-items:center to get safe centering, i.e. 96 // when the content overflows, treat it the same as align-items: flex-start. 97 innerStyle->setMarginTop(Length()); 98 innerStyle->setMarginBottom(Length()); 99 innerStyle->setFlexDirection(style()->flexDirection()); 100 innerStyle->setJustifyContent(style()->justifyContent()); 101 innerStyle->setFlexWrap(style()->flexWrap()); 102 innerStyle->setAlignItems(style()->alignItems()); 103 innerStyle->setAlignContent(style()->alignContent()); 104 } 105 106 bool RenderButton::canHaveGeneratedChildren() const 107 { 108 // Input elements can't have generated children, but button elements can. We'll 109 // write the code assuming any other button types that might emerge in the future 110 // can also have children. 111 return !isHTMLInputElement(*node()); 112 } 113 114 LayoutRect RenderButton::controlClipRect(const LayoutPoint& additionalOffset) const 115 { 116 // Clip to the padding box to at least give content the extra padding space. 117 return LayoutRect(additionalOffset.x() + borderLeft(), additionalOffset.y() + borderTop(), width() - borderLeft() - borderRight(), height() - borderTop() - borderBottom()); 118 } 119 120 int RenderButton::baselinePosition(FontBaseline baseline, bool firstLine, LineDirectionMode direction, LinePositionMode linePositionMode) const 121 { 122 ASSERT(linePositionMode == PositionOnContainingLine); 123 // We want to call the RenderBlock version of firstLineBoxBaseline to 124 // avoid RenderFlexibleBox synthesizing a baseline that we don't want. 125 // We use this check as a proxy for "are there any line boxes in this button" 126 if (!hasLineIfEmpty() && RenderBlock::firstLineBoxBaseline() == -1) { 127 // To ensure that we have a consistent baseline when we have no children, 128 // even when we have the anonymous RenderBlock child, we calculate the 129 // baseline for the empty case manually here. 130 if (direction == HorizontalLine) 131 return marginTop() + borderTop() + paddingTop() + contentHeight(); 132 133 return marginRight() + borderRight() + paddingRight() + contentWidth(); 134 } 135 return RenderFlexibleBox::baselinePosition(baseline, firstLine, direction, linePositionMode); 136 } 137 138 } // namespace WebCore 139