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content/base/public/nsViewportInfo.h@8bccb770b82d (annotated)

content/base/public/nsViewportInfo.h

Wed, 31 Dec 2014 13:27:57 +0100

author

Michael Schloh von Bennewitz <michael@schloh.com>

date

Wed, 31 Dec 2014 13:27:57 +0100

branch

TOR_BUG_3246

changeset 6

8bccb770b82d

permissions

-rw-r--r--

Ignore runtime configuration files generated during quality assurance.

michael@0	1	/* This Source Code Form is subject to the terms of the Mozilla Public
michael@0	2	* License, v. 2.0. If a copy of the MPL was not distributed with this
michael@0	3	* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
michael@0	4
michael@0	5	#ifndef nsViewportInfo_h___
michael@0	6	#define nsViewportInfo_h___
michael@0	7
michael@0	8	#include <stdint.h>
michael@0	9	#include "mozilla/Attributes.h"
michael@0	10	#include "Units.h"
michael@0	11
michael@0	12	/**
michael@0	13	* Default values for the nsViewportInfo class.
michael@0	14	*/
michael@0	15	static const mozilla::LayoutDeviceToScreenScale kViewportMinScale(0.0f);
michael@0	16	static const mozilla::LayoutDeviceToScreenScale kViewportMaxScale(10.0f);
michael@0	17	static const mozilla::CSSIntSize kViewportMinSize(200, 40);
michael@0	18	static const mozilla::CSSIntSize kViewportMaxSize(10000, 10000);
michael@0	19	static const int32_t kViewportDefaultScreenWidth = 980;
michael@0	20
michael@0	21	/**
michael@0	22	* Information retrieved from the <meta name="viewport"> tag. See
michael@0	23	* nsContentUtils::GetViewportInfo for more information on this functionality.
michael@0	24	*/
michael@0	25	class MOZ_STACK_CLASS nsViewportInfo
michael@0	26	{
michael@0	27	public:
michael@0	28	nsViewportInfo(const mozilla::ScreenIntSize& aDisplaySize,
michael@0	29	bool aAllowZoom = true, bool aAllowDoubleTapZoom = true) :
michael@0	30	mDefaultZoom(1.0),
michael@0	31	mAutoSize(true),
michael@0	32	mAllowZoom(aAllowZoom),
michael@0	33	mAllowDoubleTapZoom(aAllowDoubleTapZoom)
michael@0	34	{
michael@0	35	mSize = mozilla::gfx::RoundedToInt(mozilla::ScreenSize(aDisplaySize) / mDefaultZoom);
michael@0	36	mozilla::CSSToLayoutDeviceScale pixelRatio(1.0f);
michael@0	37	mMinZoom = pixelRatio * kViewportMinScale;
michael@0	38	mMaxZoom = pixelRatio * kViewportMaxScale;
michael@0	39	ConstrainViewportValues();
michael@0	40	}
michael@0	41
michael@0	42	nsViewportInfo(const mozilla::CSSToScreenScale& aDefaultZoom,
michael@0	43	const mozilla::CSSToScreenScale& aMinZoom,
michael@0	44	const mozilla::CSSToScreenScale& aMaxZoom,
michael@0	45	const mozilla::CSSIntSize& aSize,
michael@0	46	bool aAutoSize,
michael@0	47	bool aAllowZoom,
michael@0	48	bool aAllowDoubleTapZoom) :
michael@0	49	mDefaultZoom(aDefaultZoom),
michael@0	50	mMinZoom(aMinZoom),
michael@0	51	mMaxZoom(aMaxZoom),
michael@0	52	mSize(aSize),
michael@0	53	mAutoSize(aAutoSize),
michael@0	54	mAllowZoom(aAllowZoom),
michael@0	55	mAllowDoubleTapZoom(aAllowDoubleTapZoom)
michael@0	56	{
michael@0	57	ConstrainViewportValues();
michael@0	58	}
michael@0	59
michael@0	60	mozilla::CSSToScreenScale GetDefaultZoom() { return mDefaultZoom; }
michael@0	61	void SetDefaultZoom(const mozilla::CSSToScreenScale& aDefaultZoom);
michael@0	62	mozilla::CSSToScreenScale GetMinZoom() { return mMinZoom; }
michael@0	63	mozilla::CSSToScreenScale GetMaxZoom() { return mMaxZoom; }
michael@0	64
michael@0	65	mozilla::CSSIntSize GetSize() { return mSize; }
michael@0	66
michael@0	67	bool IsAutoSizeEnabled() { return mAutoSize; }
michael@0	68	bool IsZoomAllowed() { return mAllowZoom; }
michael@0	69	bool IsDoubleTapZoomAllowed() { return mAllowDoubleTapZoom; }
michael@0	70
michael@0	71	void SetAllowDoubleTapZoom(bool aAllowDoubleTapZoom) { mAllowDoubleTapZoom = aAllowDoubleTapZoom; }
michael@0	72
michael@0	73	private:
michael@0	74
michael@0	75	/**
michael@0	76	* Constrain the viewport calculations from the
michael@0	77	* nsContentUtils::GetViewportInfo() function in order to always return
michael@0	78	* sane minimum/maximum values.
michael@0	79	*/
michael@0	80	void ConstrainViewportValues();
michael@0	81
michael@0	82	// Default zoom indicates the level at which the display is 'zoomed in'
michael@0	83	// initially for the user, upon loading of the page.
michael@0	84	mozilla::CSSToScreenScale mDefaultZoom;
michael@0	85
michael@0	86	// The minimum zoom level permitted by the page.
michael@0	87	mozilla::CSSToScreenScale mMinZoom;
michael@0	88
michael@0	89	// The maximum zoom level permitted by the page.
michael@0	90	mozilla::CSSToScreenScale mMaxZoom;
michael@0	91
michael@0	92	// The size of the viewport, specified by the <meta name="viewport"> tag.
michael@0	93	mozilla::CSSIntSize mSize;
michael@0	94
michael@0	95	// Whether or not we should automatically size the viewport to the device's
michael@0	96	// width. This is true if the document has been optimized for mobile, and
michael@0	97	// the width property of a specified <meta name="viewport"> tag is either
michael@0	98	// not specified, or is set to the special value 'device-width'.
michael@0	99	bool mAutoSize;
michael@0	100
michael@0	101	// Whether or not the user can zoom in and out on the page. Default is true.
michael@0	102	bool mAllowZoom;
michael@0	103
michael@0	104	// Whether or not the user can double-tap to zoom in. When this is disabled
michael@0	105	// we can dispatch click events faster on a single tap because we don't have
michael@0	106	// to wait to detect the double-tap
michael@0	107	bool mAllowDoubleTapZoom;
michael@0	108	};
michael@0	109
michael@0	110	#endif
michael@0	111