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      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 "RenderButton.h"
     23 
     24 #include "Document.h"
     25 #include "GraphicsContext.h"
     26 #include "HTMLInputElement.h"
     27 #include "HTMLNames.h"
     28 #include "RenderTextFragment.h"
     29 #include "RenderTheme.h"
     30 
     31 #if ENABLE(WML)
     32 #include "WMLDoElement.h"
     33 #include "WMLNames.h"
     34 #endif
     35 
     36 namespace WebCore {
     37 
     38 using namespace HTMLNames;
     39 
     40 RenderButton::RenderButton(Node* node)
     41     : RenderFlexibleBox(node)
     42     , m_buttonText(0)
     43     , m_inner(0)
     44     , m_default(false)
     45 {
     46 }
     47 
     48 void RenderButton::addChild(RenderObject* newChild, RenderObject* beforeChild)
     49 {
     50     if (!m_inner) {
     51         // Create an anonymous block.
     52         ASSERT(!firstChild());
     53         bool isFlexibleBox = style()->display() == BOX || style()->display() == INLINE_BOX;
     54         m_inner = createAnonymousBlock(isFlexibleBox);
     55         setupInnerStyle(m_inner->style());
     56         RenderFlexibleBox::addChild(m_inner);
     57     }
     58 
     59     m_inner->addChild(newChild, beforeChild);
     60 }
     61 
     62 void RenderButton::removeChild(RenderObject* oldChild)
     63 {
     64     if (oldChild == m_inner || !m_inner) {
     65         RenderFlexibleBox::removeChild(oldChild);
     66         m_inner = 0;
     67     } else
     68         m_inner->removeChild(oldChild);
     69 }
     70 
     71 void RenderButton::styleWillChange(StyleDifference diff, const RenderStyle* newStyle)
     72 {
     73     if (m_inner) {
     74         // RenderBlock::setStyle is going to apply a new style to the inner block, which
     75         // will have the initial box flex value, 0. The current value is 1, because we set
     76         // it right below. Here we change it back to 0 to avoid getting a spurious layout hint
     77         // because of the difference.
     78         m_inner->style()->setBoxFlex(0);
     79     }
     80     RenderBlock::styleWillChange(diff, newStyle);
     81 }
     82 
     83 void RenderButton::styleDidChange(StyleDifference diff, const RenderStyle* oldStyle)
     84 {
     85     RenderBlock::styleDidChange(diff, oldStyle);
     86 
     87     if (m_buttonText)
     88         m_buttonText->setStyle(style());
     89     if (m_inner) // RenderBlock handled updating the anonymous block's style.
     90         setupInnerStyle(m_inner->style());
     91     setReplaced(isInline());
     92 
     93     if (!m_default && theme()->isDefault(this)) {
     94         if (!m_timer)
     95             m_timer.set(new Timer<RenderButton>(this, &RenderButton::timerFired));
     96         m_timer->startRepeating(0.03);
     97         m_default = true;
     98     } else if (m_default && !theme()->isDefault(this)) {
     99         m_default = false;
    100         m_timer.clear();
    101     }
    102 }
    103 
    104 void RenderButton::setupInnerStyle(RenderStyle* innerStyle)
    105 {
    106     ASSERT(innerStyle->refCount() == 1);
    107     // RenderBlock::createAnonymousBlock creates a new RenderStyle, so this is
    108     // safe to modify.
    109     innerStyle->setBoxFlex(1.0f);
    110     innerStyle->setBoxOrient(style()->boxOrient());
    111 
    112     innerStyle->setPaddingTop(Length(theme()->buttonInternalPaddingTop(), Fixed));
    113     innerStyle->setPaddingRight(Length(theme()->buttonInternalPaddingRight(), Fixed));
    114     innerStyle->setPaddingBottom(Length(theme()->buttonInternalPaddingBottom(), Fixed));
    115     innerStyle->setPaddingLeft(Length(theme()->buttonInternalPaddingLeft(), Fixed));
    116 }
    117 
    118 void RenderButton::updateFromElement()
    119 {
    120     // If we're an input element, we may need to change our button text.
    121     if (node()->hasTagName(inputTag)) {
    122         HTMLInputElement* input = static_cast<HTMLInputElement*>(node());
    123         String value = input->valueWithDefault();
    124         setText(value);
    125     }
    126 
    127 
    128 #if ENABLE(WML)
    129     else if (node()->hasTagName(WMLNames::doTag)) {
    130         WMLDoElement* doElement = static_cast<WMLDoElement*>(node());
    131 
    132         String value = doElement->label();
    133         if (value.isEmpty())
    134             value = doElement->name();
    135 
    136         setText(value);
    137     }
    138 #endif
    139 }
    140 
    141 bool RenderButton::canHaveChildren() const
    142 {
    143     // Input elements can't have children, but button elements can.  We'll
    144     // write the code assuming any other button types that might emerge in the future
    145     // can also have children.
    146     return !node()->hasTagName(inputTag);
    147 }
    148 
    149 void RenderButton::setText(const String& str)
    150 {
    151     if (str.isEmpty()) {
    152         if (m_buttonText) {
    153             m_buttonText->destroy();
    154             m_buttonText = 0;
    155         }
    156     } else {
    157         if (m_buttonText)
    158             m_buttonText->setText(str.impl());
    159         else {
    160             m_buttonText = new (renderArena()) RenderTextFragment(document(), str.impl());
    161             m_buttonText->setStyle(style());
    162             addChild(m_buttonText);
    163         }
    164     }
    165 }
    166 
    167 String RenderButton::text() const
    168 {
    169     return m_buttonText ? m_buttonText->text() : 0;
    170 }
    171 
    172 void RenderButton::updateBeforeAfterContent(PseudoId type)
    173 {
    174     if (m_inner)
    175         m_inner->children()->updateBeforeAfterContent(m_inner, type, this);
    176     else
    177         children()->updateBeforeAfterContent(this, type);
    178 }
    179 
    180 IntRect RenderButton::controlClipRect(int tx, int ty) const
    181 {
    182     // Clip to the padding box to at least give content the extra padding space.
    183     return IntRect(tx + borderLeft(), ty + borderTop(), width() - borderLeft() - borderRight(), height() - borderTop() - borderBottom());
    184 }
    185 
    186 void RenderButton::timerFired(Timer<RenderButton>*)
    187 {
    188     // FIXME Bug 25110: Ideally we would stop our timer when our Document
    189     // enters the page cache. But we currently have no way of being notified
    190     // when that happens, so we'll just ignore the timer firing as long as
    191     // we're in the cache.
    192     if (document()->inPageCache())
    193         return;
    194 
    195     repaint();
    196 }
    197 
    198 } // namespace WebCore
    199