1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
|
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
#ifndef nsViewportInfo_h___
#define nsViewportInfo_h___
#include <stdint.h>
#include "mozilla/Attributes.h"
#include "Units.h"
/**
* Default values for the nsViewportInfo class.
*/
static const mozilla::LayoutDeviceToScreenScale kViewportMinScale(0.0f);
static const mozilla::LayoutDeviceToScreenScale kViewportMaxScale(10.0f);
static const mozilla::CSSIntSize kViewportMinSize(200, 40);
static const mozilla::CSSIntSize kViewportMaxSize(10000, 10000);
static const int32_t kViewportDefaultScreenWidth = 980;
/**
* Information retrieved from the <meta name="viewport"> tag. See
* nsContentUtils::GetViewportInfo for more information on this functionality.
*/
class MOZ_STACK_CLASS nsViewportInfo
{
public:
nsViewportInfo(const mozilla::ScreenIntSize& aDisplaySize,
const mozilla::CSSToScreenScale& aDefaultZoom,
bool aAllowZoom,
bool aAllowDoubleTapZoom) :
mDefaultZoom(aDefaultZoom),
mAutoSize(true),
mAllowZoom(aAllowZoom),
mAllowDoubleTapZoom(aAllowDoubleTapZoom)
{
mSize = mozilla::ScreenSize(aDisplaySize) / mDefaultZoom;
mozilla::CSSToLayoutDeviceScale pixelRatio(1.0f);
mMinZoom = pixelRatio * kViewportMinScale;
mMaxZoom = pixelRatio * kViewportMaxScale;
ConstrainViewportValues();
}
nsViewportInfo(const mozilla::CSSToScreenScale& aDefaultZoom,
const mozilla::CSSToScreenScale& aMinZoom,
const mozilla::CSSToScreenScale& aMaxZoom,
const mozilla::CSSSize& aSize,
bool aAutoSize,
bool aAllowZoom,
bool aAllowDoubleTapZoom) :
mDefaultZoom(aDefaultZoom),
mMinZoom(aMinZoom),
mMaxZoom(aMaxZoom),
mSize(aSize),
mAutoSize(aAutoSize),
mAllowZoom(aAllowZoom),
mAllowDoubleTapZoom(aAllowDoubleTapZoom)
{
ConstrainViewportValues();
}
mozilla::CSSToScreenScale GetDefaultZoom() { return mDefaultZoom; }
void SetDefaultZoom(const mozilla::CSSToScreenScale& aDefaultZoom);
mozilla::CSSToScreenScale GetMinZoom() { return mMinZoom; }
mozilla::CSSToScreenScale GetMaxZoom() { return mMaxZoom; }
mozilla::CSSSize GetSize() { return mSize; }
bool IsAutoSizeEnabled() { return mAutoSize; }
bool IsZoomAllowed() { return mAllowZoom; }
bool IsDoubleTapZoomAllowed() { return mAllowDoubleTapZoom; }
void SetAllowDoubleTapZoom(bool aAllowDoubleTapZoom) { mAllowDoubleTapZoom = aAllowDoubleTapZoom; }
private:
/**
* Constrain the viewport calculations from the
* nsContentUtils::GetViewportInfo() function in order to always return
* sane minimum/maximum values.
*/
void ConstrainViewportValues();
// Default zoom indicates the level at which the display is 'zoomed in'
// initially for the user, upon loading of the page.
mozilla::CSSToScreenScale mDefaultZoom;
// The minimum zoom level permitted by the page.
mozilla::CSSToScreenScale mMinZoom;
// The maximum zoom level permitted by the page.
mozilla::CSSToScreenScale mMaxZoom;
// The size of the viewport, specified by the <meta name="viewport"> tag.
mozilla::CSSSize mSize;
// Whether or not we should automatically size the viewport to the device's
// width. This is true if the document has been optimized for mobile, and
// the width property of a specified <meta name="viewport"> tag is either
// not specified, or is set to the special value 'device-width'.
bool mAutoSize;
// Whether or not the user can zoom in and out on the page. Default is true.
bool mAllowZoom;
// Whether or not the user can double-tap to zoom in. When this is disabled
// we can dispatch click events faster on a single tap because we don't have
// to wait to detect the double-tap
bool mAllowDoubleTapZoom;
};
#endif
|
