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#ifndef PageScaleConstraintsSet_h
#define PageScaleConstraintsSet_h
#include "core/dom/ViewportDescription.h"
#include "core/page/PageScaleConstraints.h"
#include "platform/Length.h"
#include "platform/geometry/IntSize.h"
namespace blink {
// This class harmonizes the viewport (particularly page scale) constraints from
// the meta viewport tag and other sources.
class PageScaleConstraintsSet {
public:
PageScaleConstraintsSet();
WebCore::PageScaleConstraints defaultConstraints() const;
// Settings defined in the website's viewport tag, if viewport tag support
// is enabled.
const WebCore::PageScaleConstraints& pageDefinedConstraints() const { return m_pageDefinedConstraints; }
void updatePageDefinedConstraints(const WebCore::ViewportDescription&, WebCore::IntSize viewSize, WebCore::Length legacyFallbackWidth);
void adjustForAndroidWebViewQuirks(const WebCore::ViewportDescription&, WebCore::IntSize viewSize, int layoutFallbackWidth, float deviceScaleFactor, bool supportTargetDensityDPI, bool wideViewportQuirkEnabled, bool useWideViewport, bool loadWithOverviewMode, bool nonUserScalableQuirkEnabled);
// Constraints may also be set from Chromium -- this overrides any
// page-defined values.
const WebCore::PageScaleConstraints& userAgentConstraints() const { return m_userAgentConstraints; }
void setUserAgentConstraints(const WebCore::PageScaleConstraints&);
// Actual computed values, taking into account the above plus the current
// viewport size and document width.
const WebCore::PageScaleConstraints& finalConstraints() const { return m_finalConstraints; }
void computeFinalConstraints();
void adjustFinalConstraintsToContentsSize(WebCore::IntSize viewSize, WebCore::IntSize contentsSize, int nonOverlayScrollbarWidth);
void didChangeContentsSize(WebCore::IntSize contentsSize, float pageScaleFactor);
// 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 m_needsReset; }
// This is set when one of the inputs to finalConstraints changes.
bool constraintsDirty() const { return m_constraintsDirty; }
private:
WebCore::PageScaleConstraints computeConstraintsStack() const;
WebCore::PageScaleConstraints m_pageDefinedConstraints;
WebCore::PageScaleConstraints m_userAgentConstraints;
WebCore::PageScaleConstraints m_finalConstraints;
int m_lastContentsWidth;
bool m_needsReset;
bool m_constraintsDirty;
};
} // namespace WebCore
#endif // PageScaleConstraintsSet_h