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31 #ifndef PageScaleConstraintsSet_h
32 #define PageScaleConstraintsSet_h
34 #include "core/dom/ViewportDescription.h"
35 #include "core/page/PageScaleConstraints.h"
36 #include "platform/Length.h"
37 #include "platform/geometry/IntSize.h"
41 // This class harmonizes the viewport (particularly page scale) constraints from
42 // the meta viewport tag and other sources.
43 class PageScaleConstraintsSet {
45 PageScaleConstraintsSet();
47 PageScaleConstraints defaultConstraints() const;
49 // Settings defined in the website's viewport tag, if viewport tag support
51 const PageScaleConstraints& pageDefinedConstraints() const { return m_pageDefinedConstraints; }
52 void updatePageDefinedConstraints(const ViewportDescription&, Length legacyFallbackWidth);
53 void adjustForAndroidWebViewQuirks(const ViewportDescription&, int layoutFallbackWidth, float deviceScaleFactor, bool supportTargetDensityDPI, bool wideViewportQuirkEnabled, bool useWideViewport, bool loadWithOverviewMode, bool nonUserScalableQuirkEnabled);
55 // Constraints may also be set from Chromium -- this overrides any
56 // page-defined values.
57 const PageScaleConstraints& userAgentConstraints() const { return m_userAgentConstraints; }
58 void setUserAgentConstraints(const PageScaleConstraints&);
60 // Actual computed values, taking into account the above plus the current
61 // viewport size and document width.
62 const PageScaleConstraints& finalConstraints() const { return m_finalConstraints; }
63 void computeFinalConstraints();
64 void adjustFinalConstraintsToContentsSize(IntSize contentsSize, int nonOverlayScrollbarWidth);
66 void didChangeContentsSize(IntSize contentsSize, float pageScaleFactor);
68 // This should be set to true on each page load to note that the page scale
69 // factor needs to be reset to its initial value.
70 void setNeedsReset(bool);
71 bool needsReset() const { return m_needsReset; }
73 // This is set when one of the inputs to finalConstraints changes.
74 bool constraintsDirty() const { return m_constraintsDirty; }
76 void didChangeViewSize(const IntSize&);
78 IntSize mainFrameSize(const IntSize& contentsSize) const;
81 PageScaleConstraints computeConstraintsStack() const;
83 PageScaleConstraints m_pageDefinedConstraints;
84 PageScaleConstraints m_userAgentConstraints;
85 PageScaleConstraints m_finalConstraints;
87 int m_lastContentsWidth;
91 bool m_constraintsDirty;
96 #endif // PageScaleConstraintsSet_h