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      1 /*
      2  * Copyright (C) 2006, 2007, 2008, 2009, 2010 Apple Inc. All rights reserved.
      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/RenderSlider.h"
     23 
     24 #include "core/html/HTMLInputElement.h"
     25 #include "core/html/shadow/SliderThumbElement.h"
     26 #include "wtf/MathExtras.h"
     27 
     28 using std::min;
     29 
     30 namespace WebCore {
     31 
     32 const int RenderSlider::defaultTrackLength = 129;
     33 
     34 RenderSlider::RenderSlider(HTMLInputElement* element)
     35     : RenderFlexibleBox(element)
     36 {
     37     // We assume RenderSlider works only with <input type=range>.
     38     ASSERT(element->isRangeControl());
     39 }
     40 
     41 RenderSlider::~RenderSlider()
     42 {
     43 }
     44 
     45 bool RenderSlider::canBeReplacedWithInlineRunIn() const
     46 {
     47     return false;
     48 }
     49 
     50 int RenderSlider::baselinePosition(FontBaseline, bool /*firstLine*/, LineDirectionMode, LinePositionMode linePositionMode) const
     51 {
     52     ASSERT(linePositionMode == PositionOnContainingLine);
     53     // FIXME: Patch this function for writing-mode.
     54     return height() + marginTop();
     55 }
     56 
     57 void RenderSlider::computeIntrinsicLogicalWidths(LayoutUnit& minLogicalWidth, LayoutUnit& maxLogicalWidth) const
     58 {
     59     maxLogicalWidth = defaultTrackLength * style()->effectiveZoom();
     60     if (!style()->width().isPercent())
     61         minLogicalWidth = maxLogicalWidth;
     62 }
     63 
     64 void RenderSlider::computePreferredLogicalWidths()
     65 {
     66     m_minPreferredLogicalWidth = 0;
     67     m_maxPreferredLogicalWidth = 0;
     68 
     69     if (style()->width().isFixed() && style()->width().value() > 0)
     70         m_minPreferredLogicalWidth = m_maxPreferredLogicalWidth = adjustContentBoxLogicalWidthForBoxSizing(style()->width().value());
     71     else
     72         computeIntrinsicLogicalWidths(m_minPreferredLogicalWidth, m_maxPreferredLogicalWidth);
     73 
     74     if (style()->minWidth().isFixed() && style()->minWidth().value() > 0) {
     75         m_maxPreferredLogicalWidth = max(m_maxPreferredLogicalWidth, adjustContentBoxLogicalWidthForBoxSizing(style()->minWidth().value()));
     76         m_minPreferredLogicalWidth = max(m_minPreferredLogicalWidth, adjustContentBoxLogicalWidthForBoxSizing(style()->minWidth().value()));
     77     }
     78 
     79     if (style()->maxWidth().isFixed()) {
     80         m_maxPreferredLogicalWidth = min(m_maxPreferredLogicalWidth, adjustContentBoxLogicalWidthForBoxSizing(style()->maxWidth().value()));
     81         m_minPreferredLogicalWidth = min(m_minPreferredLogicalWidth, adjustContentBoxLogicalWidthForBoxSizing(style()->maxWidth().value()));
     82     }
     83 
     84     LayoutUnit toAdd = borderAndPaddingWidth();
     85     m_minPreferredLogicalWidth += toAdd;
     86     m_maxPreferredLogicalWidth += toAdd;
     87 
     88     setPreferredLogicalWidthsDirty(false);
     89 }
     90 
     91 void RenderSlider::layout()
     92 {
     93     StackStats::LayoutCheckPoint layoutCheckPoint;
     94     // FIXME: Find a way to cascade appearance.
     95     // http://webkit.org/b/62535
     96     RenderBox* thumbBox = sliderThumbElementOf(node())->renderBox();
     97     if (thumbBox && thumbBox->isSliderThumb())
     98         static_cast<RenderSliderThumb*>(thumbBox)->updateAppearance(style());
     99 
    100     RenderFlexibleBox::layout();
    101 }
    102 
    103 bool RenderSlider::inDragMode() const
    104 {
    105     return sliderThumbElementOf(node())->active();
    106 }
    107 
    108 } // namespace WebCore
    109