The Tor Browser: content/base/public/nsViewportInfo.h@6474c204b198

Cloned upstream origin tor-browser at tor-browser-31.3.0esr-4.5-1-build1
revision ID fc1c9ff7c1b2defdbc039f12214767608f46423f for hacking purpose.

     1 /* This Source Code Form is subject to the terms of the Mozilla Public

     2  * License, v. 2.0. If a copy of the MPL was not distributed with this

     3  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

     5 #ifndef nsViewportInfo_h___

     6 #define nsViewportInfo_h___

     8 #include <stdint.h>

     9 #include "mozilla/Attributes.h"

    10 #include "Units.h"

    12 /**

    13  * Default values for the nsViewportInfo class.

    14  */

    15 static const mozilla::LayoutDeviceToScreenScale kViewportMinScale(0.0f);

    16 static const mozilla::LayoutDeviceToScreenScale kViewportMaxScale(10.0f);

    17 static const mozilla::CSSIntSize kViewportMinSize(200, 40);

    18 static const mozilla::CSSIntSize kViewportMaxSize(10000, 10000);

    19 static const int32_t  kViewportDefaultScreenWidth = 980;

    21 /**

    22  * Information retrieved from the <meta name="viewport"> tag. See

    23  * nsContentUtils::GetViewportInfo for more information on this functionality.

    24  */

    25 class MOZ_STACK_CLASS nsViewportInfo

    26 {

    27   public:

    28     nsViewportInfo(const mozilla::ScreenIntSize& aDisplaySize,

    29                    bool aAllowZoom = true, bool aAllowDoubleTapZoom = true) :

    30       mDefaultZoom(1.0),

    31       mAutoSize(true),

    32       mAllowZoom(aAllowZoom),

    33       mAllowDoubleTapZoom(aAllowDoubleTapZoom)

    34     {

    35         mSize = mozilla::gfx::RoundedToInt(mozilla::ScreenSize(aDisplaySize) / mDefaultZoom);

    36         mozilla::CSSToLayoutDeviceScale pixelRatio(1.0f);

    37         mMinZoom = pixelRatio * kViewportMinScale;

    38         mMaxZoom = pixelRatio * kViewportMaxScale;

    39         ConstrainViewportValues();

    40     }

    42     nsViewportInfo(const mozilla::CSSToScreenScale& aDefaultZoom,

    43                    const mozilla::CSSToScreenScale& aMinZoom,

    44                    const mozilla::CSSToScreenScale& aMaxZoom,

    45                    const mozilla::CSSIntSize& aSize,

    46                    bool aAutoSize,

    47                    bool aAllowZoom,

    48                    bool aAllowDoubleTapZoom) :

    49                      mDefaultZoom(aDefaultZoom),

    50                      mMinZoom(aMinZoom),

    51                      mMaxZoom(aMaxZoom),

    52                      mSize(aSize),

    53                      mAutoSize(aAutoSize),

    54                      mAllowZoom(aAllowZoom),

    55                      mAllowDoubleTapZoom(aAllowDoubleTapZoom)

    56     {

    57       ConstrainViewportValues();

    58     }

    60     mozilla::CSSToScreenScale GetDefaultZoom() { return mDefaultZoom; }

    61     void SetDefaultZoom(const mozilla::CSSToScreenScale& aDefaultZoom);

    62     mozilla::CSSToScreenScale GetMinZoom() { return mMinZoom; }

    63     mozilla::CSSToScreenScale GetMaxZoom() { return mMaxZoom; }

    65     mozilla::CSSIntSize GetSize() { return mSize; }

    67     bool IsAutoSizeEnabled() { return mAutoSize; }

    68     bool IsZoomAllowed() { return mAllowZoom; }

    69     bool IsDoubleTapZoomAllowed() { return mAllowDoubleTapZoom; }

    71     void SetAllowDoubleTapZoom(bool aAllowDoubleTapZoom) { mAllowDoubleTapZoom = aAllowDoubleTapZoom; }

    73   private:

    75     /**

    76      * Constrain the viewport calculations from the

    77      * nsContentUtils::GetViewportInfo() function in order to always return

    78      * sane minimum/maximum values.

    79      */

    80     void ConstrainViewportValues();

    82     // Default zoom indicates the level at which the display is 'zoomed in'

    83     // initially for the user, upon loading of the page.

    84     mozilla::CSSToScreenScale mDefaultZoom;

    86     // The minimum zoom level permitted by the page.

    87     mozilla::CSSToScreenScale mMinZoom;

    89     // The maximum zoom level permitted by the page.

    90     mozilla::CSSToScreenScale mMaxZoom;

    92     // The size of the viewport, specified by the <meta name="viewport"> tag.

    93     mozilla::CSSIntSize mSize;

    95     // Whether or not we should automatically size the viewport to the device's

    96     // width. This is true if the document has been optimized for mobile, and

    97     // the width property of a specified <meta name="viewport"> tag is either

    98     // not specified, or is set to the special value 'device-width'.

    99     bool mAutoSize;

   101     // Whether or not the user can zoom in and out on the page. Default is true.

   102     bool mAllowZoom;

   104     // Whether or not the user can double-tap to zoom in. When this is disabled

   105     // we can dispatch click events faster on a single tap because we don't have

   106     // to wait to detect the double-tap

   107     bool mAllowDoubleTapZoom;

   108 };

   110 #endif

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