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
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
|
////////////////////////////////////////////////////////////
//
// SFML - Simple and Fast Multimedia Library
// Copyright (C) 2007-2016 Laurent Gomila (laurent@sfml-dev.org)
//
// This software is provided 'as-is', without any express or implied warranty.
// In no event will the authors be held liable for any damages arising from the use of this software.
//
// Permission is granted to anyone to use this software for any purpose,
// including commercial applications, and to alter it and redistribute it freely,
// subject to the following restrictions:
//
// 1. The origin of this software must not be misrepresented;
// you must not claim that you wrote the original software.
// If you use this software in a product, an acknowledgment
// in the product documentation would be appreciated but is not required.
//
// 2. Altered source versions must be plainly marked as such,
// and must not be misrepresented as being the original software.
//
// 3. This notice may not be removed or altered from any source distribution.
//
////////////////////////////////////////////////////////////
#ifndef SFML_TOUCH_HPP
#define SFML_TOUCH_HPP
////////////////////////////////////////////////////////////
// Headers
////////////////////////////////////////////////////////////
#include <SFML/Window/Export.hpp>
#include <SFML/System/Vector2.hpp>
namespace sf
{
class Window;
////////////////////////////////////////////////////////////
/// \brief Give access to the real-time state of the touches
///
////////////////////////////////////////////////////////////
class SFML_WINDOW_API Touch
{
public:
////////////////////////////////////////////////////////////
/// \brief Check if a touch event is currently down
///
/// \param finger Finger index
///
/// \return True if \a finger is currently touching the screen, false otherwise
///
////////////////////////////////////////////////////////////
static bool isDown(unsigned int finger);
////////////////////////////////////////////////////////////
/// \brief Get the current position of a touch in desktop coordinates
///
/// This function returns the current touch position
/// in global (desktop) coordinates.
///
/// \param finger Finger index
///
/// \return Current position of \a finger, or undefined if it's not down
///
////////////////////////////////////////////////////////////
static Vector2i getPosition(unsigned int finger);
////////////////////////////////////////////////////////////
/// \brief Get the current position of a touch in window coordinates
///
/// This function returns the current touch position
/// relative to the given window.
///
/// \param finger Finger index
/// \param relativeTo Reference window
///
/// \return Current position of \a finger, or undefined if it's not down
///
////////////////////////////////////////////////////////////
static Vector2i getPosition(unsigned int finger, const Window& relativeTo);
};
} // namespace sf
#endif // SFML_TOUCH_HPP
////////////////////////////////////////////////////////////
/// \class sf::Touch
/// \ingroup window
///
/// sf::Touch provides an interface to the state of the
/// touches. It only contains static functions, so it's not
/// meant to be instantiated.
///
/// This class allows users to query the touches state at any
/// time and directly, without having to deal with a window and
/// its events. Compared to the TouchBegan, TouchMoved
/// and TouchEnded events, sf::Touch can retrieve the
/// state of the touches at any time (you don't need to store and
/// update a boolean on your side in order to know if a touch is down),
/// and you always get the real state of the touches, even if they
/// happen when your window is out of focus and no event is triggered.
///
/// The getPosition function can be used to retrieve the current
/// position of a touch. There are two versions: one that operates
/// in global coordinates (relative to the desktop) and one that
/// operates in window coordinates (relative to a specific window).
///
/// Touches are identified by an index (the "finger"), so that in
/// multi-touch events, individual touches can be tracked correctly.
/// As long as a finger touches the screen, it will keep the same index
/// even if other fingers start or stop touching the screen in the
/// meantime. As a consequence, active touch indices may not always be
/// sequential (i.e. touch number 0 may be released while touch number 1
/// is still down).
///
/// Usage example:
/// \code
/// if (sf::Touch::isDown(0))
/// {
/// // touch 0 is down
/// }
///
/// // get global position of touch 1
/// sf::Vector2i globalPos = sf::Touch::getPosition(1);
///
/// // get position of touch 1 relative to a window
/// sf::Vector2i relativePos = sf::Touch::getPosition(1, window);
/// \endcode
///
/// \see sf::Joystick, sf::Keyboard, sf::Mouse
///
////////////////////////////////////////////////////////////
|
