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/*
* Copyright 2012, The Android Open Source Project
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS ``AS IS'' AND ANY
* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
* OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#ifndef FixedPositioning_h
#define FixedPositioning_h
#if USE(ACCELERATED_COMPOSITING)
#include "LayerAndroid.h"
namespace WebCore {
class IFrameLayerAndroid;
struct SkLength {
enum SkLengthType { Undefined, Auto, Relative,
Percent, Fixed, Static, Intrinsic, MinIntrinsic };
SkLengthType type;
SkScalar value;
SkLength()
{
type = Undefined;
value = 0;
}
bool defined() const
{
if (type == Undefined)
return false;
return true;
}
void setFixedValue(float v)
{
type = Fixed;
value = v;
}
void setAuto()
{
type = Auto;
}
float calcFloatValue(float max) const
{
switch (type) {
case Percent:
return (max * value) / 100.0f;
case Fixed:
return value;
default:
return value;
}
}
};
class FixedPositioning {
public:
FixedPositioning(LayerAndroid* layer = 0) : m_layer(layer) {}
FixedPositioning(LayerAndroid* layer, const FixedPositioning& position);
virtual ~FixedPositioning() {};
void setFixedPosition(SkLength left, // CSS left property
SkLength top, // CSS top property
SkLength right, // CSS right property
SkLength bottom, // CSS bottom property
SkLength marginLeft, // CSS margin-left property
SkLength marginTop, // CSS margin-top property
SkLength marginRight, // CSS margin-right property
SkLength marginBottom, // CSS margin-bottom property
const IntPoint& renderLayerPos, // For undefined fixed position
SkRect viewRect) { // view rect, can be smaller than the layer's
m_fixedLeft = left;
m_fixedTop = top;
m_fixedRight = right;
m_fixedBottom = bottom;
m_fixedMarginLeft = marginLeft;
m_fixedMarginTop = marginTop;
m_fixedMarginRight = marginRight;
m_fixedMarginBottom = marginBottom;
m_fixedRect = viewRect;
m_renderLayerPos = renderLayerPos;
}
IFrameLayerAndroid* updatePosition(SkRect viewPort,
IFrameLayerAndroid* parentIframeLayer);
void contentDraw(SkCanvas* canvas, Layer::PaintStyle style);
void dumpLayer(FILE*, int indentLevel) const;
// ViewStateSerializer friends
friend void android::serializeLayer(LayerAndroid* layer, SkWStream* stream);
friend LayerAndroid* android::deserializeLayer(int version, SkStream* stream);
private:
LayerAndroid* m_layer;
SkLength m_fixedLeft;
SkLength m_fixedTop;
SkLength m_fixedRight;
SkLength m_fixedBottom;
SkLength m_fixedMarginLeft;
SkLength m_fixedMarginTop;
SkLength m_fixedMarginRight;
SkLength m_fixedMarginBottom;
SkRect m_fixedRect;
// When fixed element is undefined or auto, the render layer's position
// is needed for offset computation
IntPoint m_renderLayerPos;
};
}
#endif // USE(ACCELERATED_COMPOSITING)
#endif // FixedPositioning_h
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