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39
40 #include "qinputdevicemanager_p.h"
41 #include "qinputdevicemanager_p_p.h"
42
43 QT_BEGIN_NAMESPACE
44
45 /*!
46 \class QInputDeviceManager
47 \internal
48
49 \brief QInputDeviceManager acts as a communication hub between QtGui and the input handlers.
50
51 On embedded platforms the input handling code is either compiled into the platform
52 plugin or is loaded dynamically as a generic plugin without any interface. The input
53 handler in use may also change between each run (e.g. evdevmouse/keyboard/touch
54 vs. libinput). QWindowSystemInterface is too limiting when Qt (the platform plugin) is
55 acting as a windowing system, and is one way only.
56
57 QInputDeviceManager solves this by providing a global object that is used to communicate
58 from the input handlers to the rest of Qt (e.g. the number of connected mice, which may
59 be important information for the cursor drawing code), and vice-versa (e.g. to indicate
60 to the input handler that a manual cursor position change was requested by the
61 application via QCursor::setPos and thus any internal state has to be updated accordingly).
62 */
63
QInputDeviceManager(QObject * parent)64 QInputDeviceManager::QInputDeviceManager(QObject *parent)
65 : QObject(*new QInputDeviceManagerPrivate, parent)
66 {
67 qRegisterMetaType<DeviceType>();
68 }
69
deviceCount(DeviceType type) const70 int QInputDeviceManager::deviceCount(DeviceType type) const
71 {
72 Q_D(const QInputDeviceManager);
73 return d->deviceCount(type);
74 }
75
deviceCount(QInputDeviceManager::DeviceType type) const76 int QInputDeviceManagerPrivate::deviceCount(QInputDeviceManager::DeviceType type) const
77 {
78 return m_deviceCount[type];
79 }
80
setDeviceCount(QInputDeviceManager::DeviceType type,int count)81 void QInputDeviceManagerPrivate::setDeviceCount(QInputDeviceManager::DeviceType type, int count)
82 {
83 Q_Q(QInputDeviceManager);
84 if (m_deviceCount[type] != count) {
85 m_deviceCount[type] = count;
86 emit q->deviceListChanged(type);
87 }
88 }
89
setCursorPos(const QPoint & pos)90 void QInputDeviceManager::setCursorPos(const QPoint &pos)
91 {
92 emit cursorPositionChangeRequested(pos);
93 }
94
95 /*!
96 \return the keyboard modifier state stored in the QInputDeviceManager object.
97
98 Keyboard input handlers are expected to keep this up-to-date via
99 setKeyboardModifiers().
100
101 Querying the state via this function (e.g. from a mouse handler that needs
102 to include the modifier state in mouse events) is the preferred alternative
103 over QGuiApplication::keyboardModifiers() since the latter may not report
104 the current state due to asynchronous QPA event processing.
105 */
keyboardModifiers() const106 Qt::KeyboardModifiers QInputDeviceManager::keyboardModifiers() const
107 {
108 Q_D(const QInputDeviceManager);
109 return d->keyboardModifiers;
110 }
111
setKeyboardModifiers(Qt::KeyboardModifiers mods)112 void QInputDeviceManager::setKeyboardModifiers(Qt::KeyboardModifiers mods)
113 {
114 Q_D(QInputDeviceManager);
115 d->keyboardModifiers = mods;
116 }
117
118 QT_END_NAMESPACE
119