| 1 | // Copyright (C) 2016 The Qt Company Ltd. |
|---|---|
| 2 | // SPDX-License-Identifier: LicenseRef-Qt-Commercial OR LGPL-3.0-only OR GPL-2.0-only OR GPL-3.0-only |
| 3 | |
| 4 | #include "qinputdevicemanager_p.h" |
| 5 | #include "qinputdevicemanager_p_p.h" |
| 6 | |
| 7 | QT_BEGIN_NAMESPACE |
| 8 | |
| 9 | QT_IMPL_METATYPE_EXTERN_TAGGED(QInputDeviceManager::DeviceType, QInputDeviceManager__DeviceType) |
| 10 | |
| 11 | /*! |
| 12 | \class QInputDeviceManager |
| 13 | \internal |
| 14 | |
| 15 | \brief QInputDeviceManager acts as a communication hub between QtGui and the input handlers. |
| 16 | |
| 17 | On embedded platforms the input handling code is either compiled into the platform |
| 18 | plugin or is loaded dynamically as a generic plugin without any interface. The input |
| 19 | handler in use may also change between each run (e.g. evdevmouse/keyboard/touch |
| 20 | vs. libinput). QWindowSystemInterface is too limiting when Qt (the platform plugin) is |
| 21 | acting as a windowing system, and is one way only. |
| 22 | |
| 23 | QInputDeviceManager solves this by providing a global object that is used to communicate |
| 24 | from the input handlers to the rest of Qt (e.g. the number of connected mice, which may |
| 25 | be important information for the cursor drawing code), and vice-versa (e.g. to indicate |
| 26 | to the input handler that a manual cursor position change was requested by the |
| 27 | application via QCursor::setPos and thus any internal state has to be updated accordingly). |
| 28 | */ |
| 29 | |
| 30 | QInputDeviceManager::QInputDeviceManager(QObject *parent) |
| 31 | : QObject(*new QInputDeviceManagerPrivate, parent) |
| 32 | { |
| 33 | qRegisterMetaType<DeviceType>(); |
| 34 | } |
| 35 | |
| 36 | QInputDeviceManager::~QInputDeviceManager() = default; |
| 37 | |
| 38 | int QInputDeviceManager::deviceCount(DeviceType type) const |
| 39 | { |
| 40 | Q_D(const QInputDeviceManager); |
| 41 | return d->deviceCount(type); |
| 42 | } |
| 43 | |
| 44 | int QInputDeviceManagerPrivate::deviceCount(QInputDeviceManager::DeviceType type) const |
| 45 | { |
| 46 | return m_deviceCount[type]; |
| 47 | } |
| 48 | |
| 49 | void QInputDeviceManagerPrivate::setDeviceCount(QInputDeviceManager::DeviceType type, int count) |
| 50 | { |
| 51 | Q_Q(QInputDeviceManager); |
| 52 | if (m_deviceCount[type] != count) { |
| 53 | m_deviceCount[type] = count; |
| 54 | emit q->deviceListChanged(type); |
| 55 | } |
| 56 | } |
| 57 | |
| 58 | void QInputDeviceManager::setCursorPos(const QPoint &pos) |
| 59 | { |
| 60 | emit cursorPositionChangeRequested(pos); |
| 61 | } |
| 62 | |
| 63 | /*! |
| 64 | \return the keyboard modifier state stored in the QInputDeviceManager object. |
| 65 | |
| 66 | Keyboard input handlers are expected to keep this up-to-date via |
| 67 | setKeyboardModifiers(). |
| 68 | |
| 69 | Querying the state via this function (e.g. from a mouse handler that needs |
| 70 | to include the modifier state in mouse events) is the preferred alternative |
| 71 | over QGuiApplication::keyboardModifiers() since the latter may not report |
| 72 | the current state due to asynchronous QPA event processing. |
| 73 | */ |
| 74 | Qt::KeyboardModifiers QInputDeviceManager::keyboardModifiers() const |
| 75 | { |
| 76 | Q_D(const QInputDeviceManager); |
| 77 | return d->keyboardModifiers; |
| 78 | } |
| 79 | |
| 80 | void QInputDeviceManager::setKeyboardModifiers(Qt::KeyboardModifiers mods) |
| 81 | { |
| 82 | Q_D(QInputDeviceManager); |
| 83 | d->keyboardModifiers = mods; |
| 84 | } |
| 85 | |
| 86 | QT_END_NAMESPACE |
| 87 | |
| 88 | #include "moc_qinputdevicemanager_p.cpp" |
| 89 |