Lomiri
Loading...
Searching...
No Matches
InputDispatcherFilter.cpp
1/*
2 * Copyright (C) 2016 Canonical Ltd.
3 *
4 * This program is free software: you can redistribute it and/or modify it under
5 * the terms of the GNU Lesser General Public License version 3, as published by
6 * the Free Software Foundation.
7 *
8 * This program is distributed in the hope that it will be useful, but WITHOUT
9 * ANY WARRANTY; without even the implied warranties of MERCHANTABILITY,
10 * SATISFACTORY QUALITY, or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
11 * Lesser General Public License for more details.
12 *
13 * You should have received a copy of the GNU Lesser General Public License
14 * along with this program. If not, see <http://www.gnu.org/licenses/>.
15 */
16
17#include "InputDispatcherFilter.h"
18#include "MousePointer.h"
19
20#include <QEvent>
21#include <QGuiApplication>
22#include <QQuickWindow>
23#include <QScreen>
24#include <QtMath>
25#include <qpa/qplatformnativeinterface.h>
26#include <qpa/qplatformscreen.h>
27
28InputDispatcherFilter *InputDispatcherFilter::instance()
29{
30 static InputDispatcherFilter filter;
31 return &filter;
32}
33
34InputDispatcherFilter::InputDispatcherFilter(QObject *parent)
35 : QObject(parent)
36 , m_pushing(false)
37{
38 QPlatformNativeInterface *ni = QGuiApplication::platformNativeInterface();
39 m_inputDispatcher = static_cast<QObject*>(ni->nativeResourceForIntegration("InputDispatcher"));
40 if (m_inputDispatcher) {
41 m_inputDispatcher->installEventFilter(this);
42 }
43}
44
45void InputDispatcherFilter::registerPointer(MousePointer *pointer)
46{
47 // allow first registered pointer to be visible.
48 m_pointers.insert(pointer);
49}
50
51void InputDispatcherFilter::unregisterPointer(MousePointer *pointer)
52{
53 m_pointers.remove(pointer);
54}
55
56bool InputDispatcherFilter::eventFilter(QObject *o, QEvent *e)
57{
58 if (o != m_inputDispatcher) return false;
59
60 switch (e->type()) {
61 case QEvent::MouseMove:
62 case QEvent::MouseButtonPress:
63 case QEvent::MouseButtonRelease:
64 {
65 // if we don't have any pointers, filter all mouse events.
66 auto pointer = currentPointer();
67 if (!pointer || !pointer->window()) return true;
68
69 QMouseEvent* me = static_cast<QMouseEvent*>(e);
70
71 // Local position gives relative change of mouse pointer.
72 QPointF movement = me->localPos();
73
74 QPointF oldPos;
75 // Adjust the position
76 if (qEnvironmentVariableIsSet("LOMIRI_RUNNING_IN_VM")) {
77 // Get the position directly from Mir
78 oldPos = me->screenPos();
79 }
80 else {
81 oldPos = pointer->window()->geometry().topLeft() + pointer->position();
82 }
83 QPointF newPos = adjustedPositionForMovement(oldPos, movement);
84 QScreen* currentScreen = screenAt(newPos);
85 if (currentScreen) {
86 QRect screenRect = currentScreen->geometry();
87 qreal newX = (oldPos + movement).x();
88 qreal newY = (oldPos + movement).y();
89
90 if (newX <= screenRect.left() && newY < screenRect.top() + pointer->topBoundaryOffset()) { // top left corner
91 const auto distance = qSqrt(qPow(newX, 2) + qPow(newY- screenRect.top() - pointer->topBoundaryOffset(), 2));
92 Q_EMIT pushedTopLeftCorner(currentScreen, qAbs(distance), me->buttons());
93 m_pushing = true;
94 } else if (newX >= screenRect.right()-1 && newY < screenRect.top() + pointer->topBoundaryOffset()) { // top right corner
95 const auto distance = qSqrt(qPow(newX-screenRect.right(), 2) + qPow(newY - screenRect.top() - pointer->topBoundaryOffset(), 2));
96 Q_EMIT pushedTopRightCorner(currentScreen, qAbs(distance), me->buttons());
97 m_pushing = true;
98 } else if (newX < 0 && newY >= screenRect.bottom()-1) { // bottom left corner
99 const auto distance = qSqrt(qPow(newX, 2) + qPow(newY-screenRect.bottom(), 2));
100 Q_EMIT pushedBottomLeftCorner(currentScreen, qAbs(distance), me->buttons());
101 m_pushing = true;
102 } else if (newX >= screenRect.right()-1 && newY >= screenRect.bottom()-1) { // bottom right corner
103 const auto distance = qSqrt(qPow(newX-screenRect.right(), 2) + qPow(newY-screenRect.bottom(), 2));
104 Q_EMIT pushedBottomRightCorner(currentScreen, qAbs(distance), me->buttons());
105 m_pushing = true;
106 } else if (newX < screenRect.left()) { // left edge
107 Q_EMIT pushedLeftBoundary(currentScreen, qAbs(newX), me->buttons());
108 m_pushing = true;
109 } else if (newX >= screenRect.right()) { // right edge
110 Q_EMIT pushedRightBoundary(currentScreen, newX - (screenRect.right() - 1), me->buttons());
111 m_pushing = true;
112 } else if (newY < screenRect.top() + pointer->topBoundaryOffset()) { // top edge
113 Q_EMIT pushedTopBoundary(currentScreen, qAbs(newY - screenRect.top() - pointer->topBoundaryOffset()), me->buttons());
114 m_pushing = true;
115 } else if (Q_LIKELY(newX > 0 && newX < screenRect.right()-1 && newY > 0 && newY < screenRect.bottom()-1)) { // normal pos, not pushing
116 if (m_pushing) {
117 Q_EMIT pushStopped(currentScreen);
118 m_pushing = false;
119 }
120 }
121 }
122
123 // Send the event
124 QMouseEvent eCopy(me->type(), me->localPos(), newPos, me->button(), me->buttons(), me->modifiers());
125 eCopy.setTimestamp(me->timestamp());
126 o->event(&eCopy);
127 return true;
128 }
129 // Adjust position for Wheel event the same way as mouse events
130 case QEvent::Wheel:
131 {
132 // if we don't have any pointers, filter all mouse events.
133 auto pointer = currentPointer();
134 if (!pointer || !pointer->window()) return true;
135
136 QWheelEvent* we = static_cast<QWheelEvent*>(e);
137
138 // Local position gives relative change of mouse pointer.
139 QPointF movement = we->position();
140
141 // Adjust the position
142 QPointF oldPos = pointer->window()->geometry().topLeft() + pointer->position();
143 QPointF newPos = adjustedPositionForMovement(oldPos, movement);
144
145 // Send the event
146 QWheelEvent eCopy(we->position(), newPos, we->pixelDelta(), we->angleDelta(), we->buttons(), we->modifiers(), we->phase(), we->inverted());
147 eCopy.setTimestamp(we->timestamp());
148 o->event(&eCopy);
149 return true;
150 }
151 default:
152 break;
153 }
154 return false;
155}
156
157QPointF InputDispatcherFilter::adjustedPositionForMovement(const QPointF &pt, const QPointF &movement) const
158{
159 QPointF adjusted = pt + movement;
160
161 auto screen = screenAt(adjusted); // first check if our move was to a screen with an enabled pointer.
162 if (screen) {
163 return adjusted;
164 } else if ((screen = screenAt(pt))) { // then check if our old position was valid
165 QRectF screenBounds = screen->geometry();
166 // bound the new position to the old screen geometry
167 adjusted.rx() = qMax(screenBounds.left(), qMin(adjusted.x(), screenBounds.right()-1));
168 adjusted.ry() = qMax(screenBounds.top(), qMin(adjusted.y(), screenBounds.bottom()-1));
169 } else {
170 auto screens = QGuiApplication::screens();
171
172 // center of first screen with a pointer.
173 Q_FOREACH(QScreen* screen, screens) {
174 Q_FOREACH(MousePointer* pointer, m_pointers) {
175 if (pointer->isEnabled() && pointer->screen() == screen) {
176 return screen->geometry().center();
177 }
178 }
179 }
180 }
181 return adjusted;
182}
183
184QScreen *InputDispatcherFilter::screenAt(const QPointF &pt) const
185{
186 Q_FOREACH(MousePointer* pointer, m_pointers) {
187 if (!pointer->isEnabled()) continue;
188
189 QScreen* screen = pointer->screen();
190 if (screen && screen->geometry().contains(pt.toPoint()))
191 return screen;
192 }
193 return nullptr;
194}
195
196MousePointer *InputDispatcherFilter::currentPointer() const
197{
198 Q_FOREACH(MousePointer* pointer, m_pointers) {
199 if (!pointer->isEnabled()) continue;
200 return pointer;
201 }
202 return nullptr;
203}