1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/content/base/public/nsViewportInfo.h Wed Dec 31 06:09:35 2014 +0100
1.3 @@ -0,0 +1,111 @@
1.4 +/* This Source Code Form is subject to the terms of the Mozilla Public
1.5 + * License, v. 2.0. If a copy of the MPL was not distributed with this
1.6 + * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
1.7 +
1.8 +#ifndef nsViewportInfo_h___
1.9 +#define nsViewportInfo_h___
1.10 +
1.11 +#include <stdint.h>
1.12 +#include "mozilla/Attributes.h"
1.13 +#include "Units.h"
1.14 +
1.15 +/**
1.16 + * Default values for the nsViewportInfo class.
1.17 + */
1.18 +static const mozilla::LayoutDeviceToScreenScale kViewportMinScale(0.0f);
1.19 +static const mozilla::LayoutDeviceToScreenScale kViewportMaxScale(10.0f);
1.20 +static const mozilla::CSSIntSize kViewportMinSize(200, 40);
1.21 +static const mozilla::CSSIntSize kViewportMaxSize(10000, 10000);
1.22 +static const int32_t kViewportDefaultScreenWidth = 980;
1.23 +
1.24 +/**
1.25 + * Information retrieved from the <meta name="viewport"> tag. See
1.26 + * nsContentUtils::GetViewportInfo for more information on this functionality.
1.27 + */
1.28 +class MOZ_STACK_CLASS nsViewportInfo
1.29 +{
1.30 + public:
1.31 + nsViewportInfo(const mozilla::ScreenIntSize& aDisplaySize,
1.32 + bool aAllowZoom = true, bool aAllowDoubleTapZoom = true) :
1.33 + mDefaultZoom(1.0),
1.34 + mAutoSize(true),
1.35 + mAllowZoom(aAllowZoom),
1.36 + mAllowDoubleTapZoom(aAllowDoubleTapZoom)
1.37 + {
1.38 + mSize = mozilla::gfx::RoundedToInt(mozilla::ScreenSize(aDisplaySize) / mDefaultZoom);
1.39 + mozilla::CSSToLayoutDeviceScale pixelRatio(1.0f);
1.40 + mMinZoom = pixelRatio * kViewportMinScale;
1.41 + mMaxZoom = pixelRatio * kViewportMaxScale;
1.42 + ConstrainViewportValues();
1.43 + }
1.44 +
1.45 + nsViewportInfo(const mozilla::CSSToScreenScale& aDefaultZoom,
1.46 + const mozilla::CSSToScreenScale& aMinZoom,
1.47 + const mozilla::CSSToScreenScale& aMaxZoom,
1.48 + const mozilla::CSSIntSize& aSize,
1.49 + bool aAutoSize,
1.50 + bool aAllowZoom,
1.51 + bool aAllowDoubleTapZoom) :
1.52 + mDefaultZoom(aDefaultZoom),
1.53 + mMinZoom(aMinZoom),
1.54 + mMaxZoom(aMaxZoom),
1.55 + mSize(aSize),
1.56 + mAutoSize(aAutoSize),
1.57 + mAllowZoom(aAllowZoom),
1.58 + mAllowDoubleTapZoom(aAllowDoubleTapZoom)
1.59 + {
1.60 + ConstrainViewportValues();
1.61 + }
1.62 +
1.63 + mozilla::CSSToScreenScale GetDefaultZoom() { return mDefaultZoom; }
1.64 + void SetDefaultZoom(const mozilla::CSSToScreenScale& aDefaultZoom);
1.65 + mozilla::CSSToScreenScale GetMinZoom() { return mMinZoom; }
1.66 + mozilla::CSSToScreenScale GetMaxZoom() { return mMaxZoom; }
1.67 +
1.68 + mozilla::CSSIntSize GetSize() { return mSize; }
1.69 +
1.70 + bool IsAutoSizeEnabled() { return mAutoSize; }
1.71 + bool IsZoomAllowed() { return mAllowZoom; }
1.72 + bool IsDoubleTapZoomAllowed() { return mAllowDoubleTapZoom; }
1.73 +
1.74 + void SetAllowDoubleTapZoom(bool aAllowDoubleTapZoom) { mAllowDoubleTapZoom = aAllowDoubleTapZoom; }
1.75 +
1.76 + private:
1.77 +
1.78 + /**
1.79 + * Constrain the viewport calculations from the
1.80 + * nsContentUtils::GetViewportInfo() function in order to always return
1.81 + * sane minimum/maximum values.
1.82 + */
1.83 + void ConstrainViewportValues();
1.84 +
1.85 + // Default zoom indicates the level at which the display is 'zoomed in'
1.86 + // initially for the user, upon loading of the page.
1.87 + mozilla::CSSToScreenScale mDefaultZoom;
1.88 +
1.89 + // The minimum zoom level permitted by the page.
1.90 + mozilla::CSSToScreenScale mMinZoom;
1.91 +
1.92 + // The maximum zoom level permitted by the page.
1.93 + mozilla::CSSToScreenScale mMaxZoom;
1.94 +
1.95 + // The size of the viewport, specified by the <meta name="viewport"> tag.
1.96 + mozilla::CSSIntSize mSize;
1.97 +
1.98 + // Whether or not we should automatically size the viewport to the device's
1.99 + // width. This is true if the document has been optimized for mobile, and
1.100 + // the width property of a specified <meta name="viewport"> tag is either
1.101 + // not specified, or is set to the special value 'device-width'.
1.102 + bool mAutoSize;
1.103 +
1.104 + // Whether or not the user can zoom in and out on the page. Default is true.
1.105 + bool mAllowZoom;
1.106 +
1.107 + // Whether or not the user can double-tap to zoom in. When this is disabled
1.108 + // we can dispatch click events faster on a single tap because we don't have
1.109 + // to wait to detect the double-tap
1.110 + bool mAllowDoubleTapZoom;
1.111 +};
1.112 +
1.113 +#endif
1.114 +
