third_party/WebKit/Source/core/layout/LayoutSlider.cpp

   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/layout/LayoutSlider.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/layout/LayoutSliderThumb.h"
  30 #include "wtf/MathExtras.h"
  31
  32 using namespace::std;
  33
  34 namespace blink {
  35
  36 const int LayoutSlider::defaultTrackLength = 129;
  37
  38 LayoutSlider::LayoutSlider(HTMLInputElement* element)
  39     : LayoutFlexibleBox(element)
  40 {
  41     // We assume LayoutSlider works only with <input type=range>.
  42     ASSERT(element->type() == InputTypeNames::range);
  43 }
  44
  45 LayoutSlider::~LayoutSlider()
  46 {
  47 }
  48
  49 int LayoutSlider::baselinePosition(FontBaseline, bool /*firstLine*/, LineDirectionMode, LinePositionMode linePositionMode) const
  50 {
  51     ASSERT(linePositionMode == PositionOnContainingLine);
  52     // FIXME: Patch this function for writing-mode.
  53     return size().height() + marginTop();
  54 }
  55
  56 void LayoutSlider::computeIntrinsicLogicalWidths(LayoutUnit& minLogicalWidth, LayoutUnit& maxLogicalWidth) const
  57 {
  58     maxLogicalWidth = defaultTrackLength * style()->effectiveZoom();
  59     if (!style()->width().hasPercent())
  60         minLogicalWidth = maxLogicalWidth;
  61 }
  62
  63 inline SliderThumbElement* LayoutSlider::sliderThumbElement() const
  64 {
  65     return toSliderThumbElement(toElement(node())->userAgentShadowRoot()->getElementById(ShadowElementNames::sliderThumb()));
  66 }
  67
  68 void LayoutSlider::layout()
  69 {
  70     // FIXME: Find a way to cascade appearance.
  71     // http://webkit.org/b/62535
  72     LayoutBox* thumbBox = sliderThumbElement()->layoutBox();
  73     if (thumbBox && thumbBox->isSliderThumb())
  74         toLayoutSliderThumb(thumbBox)->updateAppearance(styleRef());
  75
  76     LayoutFlexibleBox::layout();
  77 }
  78
  79 bool LayoutSlider::inDragMode() const
  80 {
  81     return sliderThumbElement()->active();
  82 }
  83
  84 } // namespace blink