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108 lines
3.3 KiB
C++
108 lines
3.3 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 "nsContentUtils.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 double kViewportMinScale = 0.0;
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static const double kViewportMaxScale = 10.0;
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static const uint32_t kViewportMinWidth = 200;
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static const uint32_t kViewportMaxWidth = 10000;
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static const uint32_t kViewportMinHeight = 223;
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static const uint32_t kViewportMaxHeight = 10000;
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static const int32_t kViewportDefaultScreenWidth = 980;
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/**
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* Information retrieved from the <meta name="viewport"> tag. See
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* nsContentUtils::GetViewportInfo for more information on this functionality.
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*/
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class NS_STACK_CLASS nsViewportInfo
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{
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public:
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nsViewportInfo(uint32_t aDisplayWidth, uint32_t aDisplayHeight) :
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mDefaultZoom(1.0),
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mMinZoom(kViewportMinScale),
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mMaxZoom(kViewportMaxScale),
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mWidth(aDisplayWidth),
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mHeight(aDisplayHeight),
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mAutoSize(true),
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mAllowZoom(true)
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{
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ConstrainViewportValues();
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}
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nsViewportInfo(double aDefaultZoom,
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double aMinZoom,
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double aMaxZoom,
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uint32_t aWidth,
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uint32_t aHeight,
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bool aAutoSize,
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bool aAllowZoom) :
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mDefaultZoom(aDefaultZoom),
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mMinZoom(aMinZoom),
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mMaxZoom(aMaxZoom),
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mWidth(aWidth),
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mHeight(aHeight),
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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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double GetDefaultZoom() { return mDefaultZoom; }
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void SetDefaultZoom(const double aDefaultZoom);
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double GetMinZoom() { return mMinZoom; }
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double GetMaxZoom() { return mMaxZoom; }
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uint32_t GetWidth() { return mWidth; }
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uint32_t GetHeight() { return mHeight; }
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bool IsAutoSizeEnabled() { return mAutoSize; }
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bool IsZoomAllowed() { 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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* nsContentUtils::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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// 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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double mDefaultZoom;
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// The minimum zoom level permitted by the page.
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double mMinZoom;
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// The maximum zoom level permitted by the page.
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double mMaxZoom;
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// The width of the viewport, specified by the <meta name="viewport"> tag,
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// in CSS pixels.
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uint32_t mWidth;
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// The height of the viewport, specified by the <meta name="viewport"> tag,
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// in CSS pixels.
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uint32_t mHeight;
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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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