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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/InputTypeNames.h"
     25 #include "core/dom/shadow/ShadowRoot.h"
     26 #include "core/html/HTMLInputElement.h"
     27 #include "core/html/shadow/ShadowElementNames.h"
     28 #include "core/html/shadow/SliderThumbElement.h"
     29 #include "core/rendering/RenderSliderThumb.h"
     30 #include "wtf/MathExtras.h"
     31 
     32 using std::min;
     33 
     34 namespace blink {
     35 
     36 const int RenderSlider::defaultTrackLength = 129;
     37 
     38 RenderSlider::RenderSlider(HTMLInputElement* element)
     39     : RenderFlexibleBox(element)
     40 {
     41     // We assume RenderSlider works only with <input type=range>.
     42     ASSERT(element->type() == InputTypeNames::range);
     43 }
     44 
     45 RenderSlider::~RenderSlider()
     46 {
     47 }
     48 
     49 int RenderSlider::baselinePosition(FontBaseline, bool /*firstLine*/, LineDirectionMode, LinePositionMode linePositionMode) const
     50 {
     51     ASSERT(linePositionMode == PositionOnContainingLine);
     52     // FIXME: Patch this function for writing-mode.
     53     return height() + marginTop();
     54 }
     55 
     56 void RenderSlider::computeIntrinsicLogicalWidths(LayoutUnit& minLogicalWidth, LayoutUnit& maxLogicalWidth) const
     57 {
     58     maxLogicalWidth = defaultTrackLength * style()->effectiveZoom();
     59     if (!style()->width().isPercent())
     60         minLogicalWidth = maxLogicalWidth;
     61 }
     62 
     63 void RenderSlider::computePreferredLogicalWidths()
     64 {
     65     m_minPreferredLogicalWidth = 0;
     66     m_maxPreferredLogicalWidth = 0;
     67     RenderStyle* styleToUse = style();
     68 
     69     if (styleToUse->width().isFixed() && styleToUse->width().value() > 0)
     70         m_minPreferredLogicalWidth = m_maxPreferredLogicalWidth = adjustContentBoxLogicalWidthForBoxSizing(styleToUse->width().value());
     71     else
     72         computeIntrinsicLogicalWidths(m_minPreferredLogicalWidth, m_maxPreferredLogicalWidth);
     73 
     74     if (styleToUse->minWidth().isFixed() && styleToUse->minWidth().value() > 0) {
     75         m_maxPreferredLogicalWidth = max(m_maxPreferredLogicalWidth, adjustContentBoxLogicalWidthForBoxSizing(styleToUse->minWidth().value()));
     76         m_minPreferredLogicalWidth = max(m_minPreferredLogicalWidth, adjustContentBoxLogicalWidthForBoxSizing(styleToUse->minWidth().value()));
     77     }
     78 
     79     if (styleToUse->maxWidth().isFixed()) {
     80         m_maxPreferredLogicalWidth = min(m_maxPreferredLogicalWidth, adjustContentBoxLogicalWidthForBoxSizing(styleToUse->maxWidth().value()));
     81         m_minPreferredLogicalWidth = min(m_minPreferredLogicalWidth, adjustContentBoxLogicalWidthForBoxSizing(styleToUse->maxWidth().value()));
     82     }
     83 
     84     LayoutUnit toAdd = borderAndPaddingWidth();
     85     m_minPreferredLogicalWidth += toAdd;
     86     m_maxPreferredLogicalWidth += toAdd;
     87 
     88     clearPreferredLogicalWidthsDirty();
     89 }
     90 
     91 inline SliderThumbElement* RenderSlider::sliderThumbElement() const
     92 {
     93     return toSliderThumbElement(toElement(node())->userAgentShadowRoot()->getElementById(ShadowElementNames::sliderThumb()));
     94 }
     95 
     96 void RenderSlider::layout()
     97 {
     98     // FIXME: Find a way to cascade appearance.
     99     // http://webkit.org/b/62535
    100     RenderBox* thumbBox = sliderThumbElement()->renderBox();
    101     if (thumbBox && thumbBox->isSliderThumb())
    102         static_cast<RenderSliderThumb*>(thumbBox)->updateAppearance(style());
    103 
    104     RenderFlexibleBox::layout();
    105 }
    106 
    107 bool RenderSlider::inDragMode() const
    108 {
    109     return sliderThumbElement()->active();
    110 }
    111 
    112 } // namespace blink
    113