107 lines
3.7 KiB
C++
107 lines
3.7 KiB
C++
/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#ifndef nsViewportInfo_h___
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#define nsViewportInfo_h___
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#include <stdint.h>
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#include "mozilla/Attributes.h"
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#include "Units.h"
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/**
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* Default values for the nsViewportInfo class.
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*/
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static const mozilla::LayoutDeviceToScreenScale kViewportMinScale(0.1f);
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static const mozilla::LayoutDeviceToScreenScale kViewportMaxScale(10.0f);
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static const mozilla::CSSIntSize kViewportMinSize(200, 40);
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static const mozilla::CSSIntSize kViewportMaxSize(10000, 10000);
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/**
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* Information retrieved from the <meta name="viewport"> tag. See
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* nsIDocument::GetViewportInfo for more information on this functionality.
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*/
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class MOZ_STACK_CLASS nsViewportInfo
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{
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public:
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nsViewportInfo(const mozilla::ScreenIntSize& aDisplaySize,
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const mozilla::CSSToScreenScale& aDefaultZoom,
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bool aAllowZoom) :
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mDefaultZoomValid(true),
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mDefaultZoom(aDefaultZoom),
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mAutoSize(true),
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mAllowZoom(aAllowZoom)
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{
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mSize = mozilla::ScreenSize(aDisplaySize) / mDefaultZoom;
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mozilla::CSSToLayoutDeviceScale pixelRatio(1.0f);
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mMinZoom = pixelRatio * kViewportMinScale;
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mMaxZoom = pixelRatio * kViewportMaxScale;
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ConstrainViewportValues();
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}
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nsViewportInfo(const mozilla::CSSToScreenScale& aDefaultZoom,
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const mozilla::CSSToScreenScale& aMinZoom,
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const mozilla::CSSToScreenScale& aMaxZoom,
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const mozilla::CSSSize& aSize,
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bool aAutoSize,
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bool aAllowZoom) :
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mDefaultZoomValid(true),
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mDefaultZoom(aDefaultZoom),
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mMinZoom(aMinZoom),
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mMaxZoom(aMaxZoom),
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mSize(aSize),
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mAutoSize(aAutoSize),
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mAllowZoom(aAllowZoom)
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{
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ConstrainViewportValues();
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}
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bool IsDefaultZoomValid() const { return mDefaultZoomValid; }
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mozilla::CSSToScreenScale GetDefaultZoom() const { return mDefaultZoom; }
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mozilla::CSSToScreenScale GetMinZoom() const { return mMinZoom; }
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mozilla::CSSToScreenScale GetMaxZoom() const { return mMaxZoom; }
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mozilla::CSSSize GetSize() const { return mSize; }
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bool IsAutoSizeEnabled() const { return mAutoSize; }
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bool IsZoomAllowed() const { return mAllowZoom; }
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private:
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/**
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* Constrain the viewport calculations from the
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* nsIDocument::GetViewportInfo() function in order to always return
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* sane minimum/maximum values.
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*/
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void ConstrainViewportValues();
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// If the default zoom was specified and was between the min and max
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// zoom values.
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bool mDefaultZoomValid;
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// Default zoom indicates the level at which the display is 'zoomed in'
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// initially for the user, upon loading of the page.
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mozilla::CSSToScreenScale mDefaultZoom;
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// The minimum zoom level permitted by the page.
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mozilla::CSSToScreenScale mMinZoom;
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// The maximum zoom level permitted by the page.
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mozilla::CSSToScreenScale mMaxZoom;
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// The size of the viewport, specified by the <meta name="viewport"> tag.
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mozilla::CSSSize mSize;
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// Whether or not we should automatically size the viewport to the device's
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// width. This is true if the document has been optimized for mobile, and
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// the width property of a specified <meta name="viewport"> tag is either
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// not specified, or is set to the special value 'device-width'.
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bool mAutoSize;
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// Whether or not the user can zoom in and out on the page. Default is true.
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bool mAllowZoom;
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};
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#endif
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