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/*
* Copyright (C) 2013 Google Inc. All rights reserved.
*
* 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.
* * Neither the name of Google Inc. nor the names of its
* contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "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.
*/
#include "config.h"
#include "core/page/PageScaleConstraints.h"
#include <algorithm>
namespace WebCore {
PageScaleConstraints::PageScaleConstraints()
: initialScale(-1), minimumScale(-1), maximumScale(-1) { }
PageScaleConstraints::PageScaleConstraints(float initial, float minimum, float maximum)
: initialScale(initial), minimumScale(minimum), maximumScale(maximum) { }
void PageScaleConstraints::overrideWith(const PageScaleConstraints& other)
{
if (other.initialScale != -1) {
initialScale = other.initialScale;
if (minimumScale != -1)
minimumScale = std::min(minimumScale, other.initialScale);
}
if (other.minimumScale != -1)
minimumScale = other.minimumScale;
if (other.maximumScale != -1)
maximumScale = other.maximumScale;
if (!other.layoutSize.isEmpty())
layoutSize = other.layoutSize;
clampAll();
}
float PageScaleConstraints::clampToConstraints(float pageScaleFactor) const
{
if (pageScaleFactor == -1)
return pageScaleFactor;
if (minimumScale != -1)
pageScaleFactor = std::max(pageScaleFactor, minimumScale);
if (maximumScale != -1)
pageScaleFactor = std::min(pageScaleFactor, maximumScale);
return pageScaleFactor;
}
void PageScaleConstraints::clampAll()
{
if (minimumScale != -1 && maximumScale != -1)
maximumScale = std::max(minimumScale, maximumScale);
initialScale = clampToConstraints(initialScale);
}
void PageScaleConstraints::fitToContentsWidth(float contentsWidth, int viewWidthNotIncludingScrollbars)
{
if (!contentsWidth || !viewWidthNotIncludingScrollbars)
return;
// Clamp the minimum scale so that the viewport can't exceed the document
// width.
minimumScale = std::max(minimumScale, viewWidthNotIncludingScrollbars / contentsWidth);
// If the initial scale wasn't defined, set it to minimum scale now that we
// know the real value.
if (initialScale == -1)
initialScale = minimumScale;
clampAll();
}
bool PageScaleConstraints::operator==(const PageScaleConstraints& other) const
{
return layoutSize == other.layoutSize
&& initialScale == other.initialScale
&& minimumScale == other.minimumScale
&& maximumScale == other.maximumScale;
}
} // namespace WebCore
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