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unity8/src/MouseTouchAdaptor.cpp
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1/*
2 * Copyright (C) 2013,2015 Canonical, Ltd.
3 *
4 * This program is free software; you can redistribute it and/or modify
5 * it under the terms of the GNU General Public License as published by
6 * the Free Software Foundation; version 3.
7 *
8 * This program is distributed in the hope that it will be useful,
9 * but WITHOUT ANY WARRANTY; without even the implied warranty of
10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
11 * GNU General Public License for more details.
12 *
13 * You should have received a copy of the GNU General Public License
14 * along with this program. If not, see <http://www.gnu.org/licenses/>.
15 *
16 * Authored by: Daniel d'Andrada <daniel.dandrada@canonical.com>
17 */
20/* Some parts of the code were copied from the XCB platform plugin of the Qt Toolkit,
21 * which is under the following license:
22 */
24/****************************************************************************
25**
26** Copyright (C) 2015 The Qt Company Ltd.
27** Contact: http://www.qt.io/licensing/
28**
29** This file is part of the .
30**
31** $QT_BEGIN_LICENSE:LGPL21$
32** Commercial License Usage
33** Licensees holding valid commercial Qt licenses may use this file in
34** accordance with the commercial license agreement provided with the
35** Software or, alternatively, in accordance with the terms contained in
36** a written agreement between you and The Qt Company. For licensing terms
37** and conditions see http://www.qt.io/terms-conditions. For further
38** information use the contact form at http://www.qt.io/contact-us.
39**
40** GNU Lesser General Public License Usage
41** Alternatively, this file may be used under the terms of the GNU Lesser
42** General Public License version 2.1 or version 3 as published by the Free
43** Software Foundation and appearing in the file LICENSE.LGPLv21 and
44** LICENSE.LGPLv3 included in the packaging of this file. Please review the
45** following information to ensure the GNU Lesser General Public License
46** requirements will be met: https://www.gnu.org/licenses/lgpl.html and
47** http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
48**
49** As a special exception, The Qt Company gives you certain additional
50** rights. These rights are described in The Qt Company LGPL Exception
51** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
52**
53** $QT_END_LICENSE$
54**
55****************************************************************************/
57#include "MouseTouchAdaptor.h"
59#include <qpa/qplatformnativeinterface.h>
60#include <qpa/qwindowsysteminterface.h>
62#include <QCoreApplication>
63#include <QMouseEvent>
64#include <QTest>
66#include <X11/extensions/XInput2.h>
67#include <X11/extensions/XI2proto.h>
69using QTest::QTouchEventSequence;
71namespace {
72MouseTouchAdaptor *g_instance = nullptr;
74Qt::MouseButton translateMouseButton(xcb_button_t detail)
76 switch (detail) {
77 case 1: return Qt::LeftButton;
78 case 2: return Qt::MidButton;
79 case 3: return Qt::RightButton;
80 // Button values 4-7 are Wheel events
81 default: return Qt::NoButton;
82 }
84} // end of anonymous namespace
86MouseTouchAdaptor::MouseTouchAdaptor()
87 : QObject(nullptr), m_leftButtonIsPressed(false), m_enabled(true)
89 QCoreApplication::instance()->installNativeEventFilter(this);
91 m_touchDevice = new QTouchDevice;
92 m_touchDevice->setType(QTouchDevice::TouchScreen);
93 QWindowSystemInterface::registerTouchDevice(m_touchDevice);
95 fetchXInput2Info();
98MouseTouchAdaptor::~MouseTouchAdaptor()
100 g_instance = nullptr;
103MouseTouchAdaptor* MouseTouchAdaptor::instance()
105 if (!g_instance) {
106 g_instance = new MouseTouchAdaptor;
107 }
109 return g_instance;
112void MouseTouchAdaptor::fetchXInput2Info()
114 QPlatformNativeInterface *nativeInterface = qGuiApp->platformNativeInterface();
115 Display *xDisplay = static_cast<Display*>(nativeInterface->nativeResourceForIntegration("Display"));
116 if (xDisplay && XQueryExtension(xDisplay, "XInputExtension", &m_xiOpCode, &m_xiEventBase, &m_xiErrorBase)) {
117 int xiMajor = 2;
118 m_xi2Minor = 2; // try 2.2 first, needed for TouchBegin/Update/End
119 if (XIQueryVersion(xDisplay, &xiMajor, &m_xi2Minor) == BadRequest) {
120 m_xi2Minor = 1; // for smooth scrolling 2.1 is enough
121 if (XIQueryVersion(xDisplay, &xiMajor, &m_xi2Minor) == BadRequest) {
122 m_xi2Minor = 0; // for tablet support 2.0 is enough
123 m_xi2Enabled = XIQueryVersion(xDisplay, &xiMajor, &m_xi2Minor) != BadRequest;
124 } else
125 m_xi2Enabled = true;
126 } else {
127 m_xi2Enabled = true;
128 }
129 }
132// Starting from the xcb version 1.9.3 struct xcb_ge_event_t has changed:
133// - "pad0" became "extension"
134// - "pad1" and "pad" became "pad0"
135// New and old version of this struct share the following fields:
136// NOTE: API might change again in the next release of xcb in which case this comment will
137// need to be updated to reflect the reality.
138typedef struct qt_xcb_ge_event_t {
139 uint8_t response_type;
140 uint8_t extension;
141 uint16_t sequence;
142 uint32_t length;
143 uint16_t event_type;
144} qt_xcb_ge_event_t;
146bool xi2PrepareXIGenericDeviceEvent(xcb_ge_event_t *ev, int opCode)
148 qt_xcb_ge_event_t *event = (qt_xcb_ge_event_t *)ev;
149 // xGenericEvent has "extension" on the second byte, the same is true for xcb_ge_event_t starting from
150 // the xcb version 1.9.3, prior to that it was called "pad0".
151 if (event->extension == opCode) {
152 // xcb event structs contain stuff that wasn't on the wire, the full_sequence field
153 // adds an extra 4 bytes and generic events cookie data is on the wire right after the standard 32 bytes.
154 // Move this data back to have the same layout in memory as it was on the wire
155 // and allow casting, overwriting the full_sequence field.
156 memmove((char*) event + 32, (char*) event + 36, event->length * 4);
157 return true;
158 }
159 return false;
162static inline qreal fixed1616ToReal(FP1616 val)
164 return qreal(val) / 0x10000;
167bool MouseTouchAdaptor::xi2HandleEvent(xcb_ge_event_t *event)
169 if (!xi2PrepareXIGenericDeviceEvent(event, m_xiOpCode)) {
170 return false;
171 }
173 xXIGenericDeviceEvent *xiEvent = reinterpret_cast<xXIGenericDeviceEvent *>(event);
174 xXIDeviceEvent *xiDeviceEvent = 0;
176 switch (xiEvent->evtype) {
177 case XI_ButtonPress:
178 case XI_ButtonRelease:
179 case XI_Motion:
180 xiDeviceEvent = reinterpret_cast<xXIDeviceEvent *>(event);
181 break;
182 default:
183 break;
184 }
186 if (!xiDeviceEvent) {
187 return false;
188 }
190 switch (xiDeviceEvent->evtype) {
191 case XI_ButtonPress:
192 return handleButtonPress(
193 static_cast<WId>(xiDeviceEvent->event),
194 xiDeviceEvent->detail,
195 fixed1616ToReal(xiDeviceEvent->event_x),
196 fixed1616ToReal(xiDeviceEvent->event_y));
197 case XI_ButtonRelease:
198 return handleButtonRelease(
199 static_cast<WId>(xiDeviceEvent->event),
200 xiDeviceEvent->detail,
201 fixed1616ToReal(xiDeviceEvent->event_x),
202 fixed1616ToReal(xiDeviceEvent->event_y));
203 case XI_Motion:
204 return handleMotionNotify(
205 static_cast<WId>(xiDeviceEvent->event),
206 fixed1616ToReal(xiDeviceEvent->event_x),
207 fixed1616ToReal(xiDeviceEvent->event_y));
208 return true;
209 default:
210 return false;
211 }
215bool MouseTouchAdaptor::nativeEventFilter(const QByteArray & eventType,
216 void * message, long * /*result*/)
218 static int eventCount = 0;
219 eventCount++;
220 if (!m_enabled) {
221 return false;
222 }
224 if (eventType != "xcb_generic_event_t") {
225 // wrong backend.
226 qWarning("MouseTouchAdaptor: XCB backend not in use. Adaptor inoperative!");
227 return false;
228 }
230 xcb_generic_event_t *xcbEvent = static_cast<xcb_generic_event_t *>(message);
232 switch (xcbEvent->response_type & ~0x80) {
233 case XCB_BUTTON_PRESS: {
234 auto pressEvent = reinterpret_cast<xcb_button_press_event_t *>(xcbEvent);
235 return handleButtonPress(static_cast<WId>(pressEvent->event), pressEvent->detail,
236 pressEvent->event_x, pressEvent->event_y);
237 }
238 case XCB_BUTTON_RELEASE: {
239 auto releaseEvent = reinterpret_cast<xcb_button_release_event_t *>(xcbEvent);
240 return handleButtonRelease(static_cast<WId>(releaseEvent->event), releaseEvent->detail,
241 releaseEvent->event_x, releaseEvent->event_y);
242 }
243 case XCB_MOTION_NOTIFY: {
244 auto motionEvent = reinterpret_cast<xcb_motion_notify_event_t *>(xcbEvent);
245 return handleMotionNotify(static_cast<WId>(motionEvent->event), motionEvent->event_x, motionEvent->event_y);
246 }
247 case XCB_GE_GENERIC:
248 if (m_xi2Enabled) {
249 return xi2HandleEvent(reinterpret_cast<xcb_ge_event_t *>(xcbEvent));
250 } else {
251 return false;
252 }
253 default:
254 return false;
255 };
258bool MouseTouchAdaptor::handleButtonPress(WId windowId, uint32_t detail, int x, int y)
260 Qt::MouseButton button = translateMouseButton(detail);
262 // Just eat the event if it wasn't a left mouse press
263 if (button != Qt::LeftButton)
264 return true;
266 QWindow *targetWindow = findQWindowWithXWindowID(windowId);
268 QPoint windowPos(x / targetWindow->devicePixelRatio(), y / targetWindow->devicePixelRatio());
270 QTouchEventSequence touchEvent = QTest::touchEvent(targetWindow, m_touchDevice,
271 false /* autoCommit */);
272 touchEvent.press(0 /* touchId */, windowPos);
273 touchEvent.commit(false /* processEvents */);
275 m_leftButtonIsPressed = true;
276 return true;
279bool MouseTouchAdaptor::handleButtonRelease(WId windowId, uint32_t detail, int x, int y)
281 Qt::MouseButton button = translateMouseButton(detail);
283 // Just eat the event if it wasn't a left mouse release
284 if (button != Qt::LeftButton)
285 return true;
287 QWindow *targetWindow = findQWindowWithXWindowID(windowId);
289 QPoint windowPos(x / targetWindow->devicePixelRatio(), y / targetWindow->devicePixelRatio());
291 QTouchEventSequence touchEvent = QTest::touchEvent(targetWindow, m_touchDevice,
292 false /* autoCommit */);
293 touchEvent.release(0 /* touchId */, windowPos);
294 touchEvent.commit(false /* processEvents */);
296 m_leftButtonIsPressed = false;
297 return true;
300bool MouseTouchAdaptor::handleMotionNotify(WId windowId, int x, int y)
302 if (!m_leftButtonIsPressed) {
303 return true;
304 }
306 QWindow *targetWindow = findQWindowWithXWindowID(windowId);
308 QPoint windowPos(x / targetWindow->devicePixelRatio(), y / targetWindow->devicePixelRatio());
310 QTouchEventSequence touchEvent = QTest::touchEvent(targetWindow, m_touchDevice,
311 false /* autoCommit */);
312 touchEvent.move(0 /* touchId */, windowPos);
313 touchEvent.commit(false /* processEvents */);
315 return true;
318QWindow *MouseTouchAdaptor::findQWindowWithXWindowID(WId windowId)
320 QWindowList windowList = QGuiApplication::topLevelWindows();
321 QWindow *foundWindow = nullptr;
323 int i = 0;
324 while (!foundWindow && i < windowList.count()) {
325 QWindow *window = windowList[i];
326 if (window->winId() == windowId) {
327 foundWindow = window;
328 } else {
329 ++i;
330 }
331 }
333 Q_ASSERT(foundWindow);
334 return foundWindow;
337bool MouseTouchAdaptor::enabled() const
339 return m_enabled;
342void MouseTouchAdaptor::setEnabled(bool value)
344 if (value != m_enabled) {
345 m_enabled = value;
346 Q_EMIT enabledChanged(value);
347 }