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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.
*/
#ifndef THIRD_PARTY_BLINK_RENDERER_CORE_FRAME_PAGE_SCALE_CONSTRAINTS_SET_H_
#define THIRD_PARTY_BLINK_RENDERER_CORE_FRAME_PAGE_SCALE_CONSTRAINTS_SET_H_
#include <memory>
#include "base/memory/ptr_util.h"
#include "third_party/blink/renderer/core/core_export.h"
#include "third_party/blink/renderer/core/frame/page_scale_constraints.h"
#include "third_party/blink/renderer/core/page/viewport_description.h"
#include "third_party/blink/renderer/platform/geometry/int_size.h"
#include "third_party/blink/renderer/platform/geometry/length.h"
#include "third_party/blink/renderer/platform/heap/handle.h"
#include "third_party/blink/renderer/platform/wtf/allocator.h"
namespace blink {
class Page;
// This class harmonizes the viewport (particularly page scale) constraints from
// the meta viewport tag and other sources.
class CORE_EXPORT PageScaleConstraintsSet
: public GarbageCollected<PageScaleConstraintsSet> {
public:
static PageScaleConstraintsSet* Create(Page* page) {
return new PageScaleConstraintsSet(page);
}
void Trace(blink::Visitor*);
void SetDefaultConstraints(const PageScaleConstraints&);
const PageScaleConstraints& DefaultConstraints() const;
// Settings defined in the website's viewport tag, if viewport tag support
// is enabled.
const PageScaleConstraints& PageDefinedConstraints() const {
return page_defined_constraints_;
}
void UpdatePageDefinedConstraints(const ViewportDescription&,
Length legacy_fallback_width);
void AdjustForAndroidWebViewQuirks(const ViewportDescription&,
int layout_fallback_width,
float device_scale_factor,
bool support_target_density_dpi,
bool wide_viewport_quirk_enabled,
bool use_wide_viewport,
bool load_with_overview_mode,
bool non_user_scalable_quirk_enabled);
void ClearPageDefinedConstraints();
// Constraints may also be set from Chromium -- this overrides any
// page-defined values.
const PageScaleConstraints& UserAgentConstraints() const {
return user_agent_constraints_;
}
void SetUserAgentConstraints(const PageScaleConstraints&);
const PageScaleConstraints& FullscreenConstraints() const {
return fullscreen_constraints_;
}
void SetFullscreenConstraints(const PageScaleConstraints&);
// Actual computed values, taking into account the above plus the current
// viewport size and document width.
const PageScaleConstraints& FinalConstraints() const {
return final_constraints_;
}
void ComputeFinalConstraints();
void DidChangeContentsSize(IntSize contents_size,
int vertical_scrollbar_width,
float page_scale_factor);
// This should be set to true on each page load to note that the page scale
// factor needs to be reset to its initial value.
void SetNeedsReset(bool);
bool NeedsReset() const { return needs_reset_; }
// This is set when one of the inputs to finalConstraints changes.
bool ConstraintsDirty() const { return constraints_dirty_; }
void DidChangeInitialContainingBlockSize(const IntSize&);
IntSize GetLayoutSize() const;
IntSize InitialViewportSize() const { return icb_size_; }
private:
PageScaleConstraintsSet(Page* page);
PageScaleConstraints ComputeConstraintsStack() const;
void AdjustFinalConstraintsToContentsSize();
PageScaleConstraints default_constraints_;
PageScaleConstraints page_defined_constraints_;
PageScaleConstraints user_agent_constraints_;
PageScaleConstraints fullscreen_constraints_;
PageScaleConstraints final_constraints_;
Member<Page> page_;
int last_contents_width_;
int last_vertical_scrollbar_width_;
IntSize icb_size_;
bool needs_reset_;
bool constraints_dirty_;
};
} // namespace blink
#endif // THIRD_PARTY_BLINK_RENDERER_CORE_FRAME_PAGE_SCALE_CONSTRAINTS_SET_H_
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