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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/geometry/IntSize.h"
40 // This class harmonizes the viewport (particularly page scale) constraints from
41 // the meta viewport tag and other sources.
42 class PageScaleConstraintsSet {
44 PageScaleConstraintsSet();
46 WebCore::PageScaleConstraints defaultConstraints() const;
48 // Settings defined in the website's viewport tag, if viewport tag support
50 const WebCore::PageScaleConstraints& pageDefinedConstraints() const { return m_pageDefinedConstraints; }
51 void updatePageDefinedConstraints(const WebCore::ViewportDescription&, WebCore::IntSize viewSize);
52 void adjustForAndroidWebViewQuirks(const WebCore::ViewportDescription&, WebCore::IntSize viewSize, int layoutFallbackWidth, float deviceScaleFactor, bool supportTargetDensityDPI, bool wideViewportQuirkEnabled, bool useWideViewport, bool loadWithOverviewMode, bool nonUserScalableQuirkEnabled);
54 // Constraints may also be set from Chromium -- this overrides any
55 // page-defined values.
56 const WebCore::PageScaleConstraints& userAgentConstraints() const { return m_userAgentConstraints; }
57 void setUserAgentConstraints(const WebCore::PageScaleConstraints&);
59 // Actual computed values, taking into account the above plus the current
60 // viewport size and document width.
61 const WebCore::PageScaleConstraints& finalConstraints() const { return m_finalConstraints; }
62 void computeFinalConstraints();
63 void adjustFinalConstraintsToContentsSize(WebCore::IntSize viewSize, WebCore::IntSize contentsSize, int nonOverlayScrollbarWidth);
65 void didChangeContentsSize(WebCore::IntSize contentsSize, float pageScaleFactor);
67 // This should be set to true on each page load to note that the page scale
68 // factor needs to be reset to its initial value.
69 void setNeedsReset(bool);
70 bool needsReset() const { return m_needsReset; }
72 // This is set when one of the inputs to finalConstraints changes.
73 bool constraintsDirty() const { return m_constraintsDirty; }
76 WebCore::PageScaleConstraints computeConstraintsStack() const;
78 WebCore::PageScaleConstraints m_pageDefinedConstraints;
79 WebCore::PageScaleConstraints m_userAgentConstraints;
80 WebCore::PageScaleConstraints m_finalConstraints;
82 int m_lastContentsWidth;
85 bool m_constraintsDirty;
88 } // namespace WebCore
90 #endif // PageScaleConstraintsSet_h