git.iko.soy/unity8
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unity8/plugins/Cursor/InputDispatcherFilter.cpp
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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 */
17#include "InputDispatcherFilter.h"
18#include "MousePointer.h"
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>
28InputDispatcherFilter *InputDispatcherFilter::instance()
30 static InputDispatcherFilter filter;
31 return &filter;
34InputDispatcherFilter::InputDispatcherFilter(QObject *parent)
35 : QObject(parent)
36 , m_pushing(false)
38 QPlatformNativeInterface *ni = QGuiApplication::platformNativeInterface();
39 m_inputDispatcher = static_cast<QObject*>(ni->nativeResourceForIntegration("InputDispatcher"));
40 if (m_inputDispatcher) {
41 m_inputDispatcher->installEventFilter(this);
42 }
45void InputDispatcherFilter::registerPointer(MousePointer *pointer)
47 // allow first registered pointer to be visible.
48 m_pointers.insert(pointer);
51void InputDispatcherFilter::unregisterPointer(MousePointer *pointer)
53 m_pointers.remove(pointer);
56bool InputDispatcherFilter::eventFilter(QObject *o, QEvent *e)
58 if (o != m_inputDispatcher) return false;
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) return true;
69 QMouseEvent* me = static_cast<QMouseEvent*>(e);
71 // Local position gives relative change of mouse pointer.
72 QPointF movement = me->localPos();
74 // Adjust the position
75 QPointF oldPos = pointer->window()->geometry().topLeft() + pointer->position();
76 QPointF newPos = adjustedPositionForMovement(oldPos, movement);
78 QScreen* currentScreen = screenAt(newPos);
79 if (currentScreen) {
80 QRect screenRect = currentScreen->geometry();
81 qreal newX = (oldPos + movement).x();
82 qreal newY = (oldPos + movement).y();
84 if (newX <= screenRect.left() && newY < screenRect.top() + pointer->topBoundaryOffset()) { // top left corner
85 const auto distance = qSqrt(qPow(newX, 2) + qPow(newY- screenRect.top() - pointer->topBoundaryOffset(), 2));
86 Q_EMIT pushedTopLeftCorner(currentScreen, qAbs(distance), me->buttons());
87 m_pushing = true;
88 } else if (newX >= screenRect.right()-1 && newY < screenRect.top() + pointer->topBoundaryOffset()) { // top right corner
89 const auto distance = qSqrt(qPow(newX-screenRect.right(), 2) + qPow(newY - screenRect.top() - pointer->topBoundaryOffset(), 2));
90 Q_EMIT pushedTopRightCorner(currentScreen, qAbs(distance), me->buttons());
91 m_pushing = true;
92 } else if (newX < 0 && newY >= screenRect.bottom()-1) { // bottom left corner
93 const auto distance = qSqrt(qPow(newX, 2) + qPow(newY-screenRect.bottom(), 2));
94 Q_EMIT pushedBottomLeftCorner(currentScreen, qAbs(distance), me->buttons());
95 m_pushing = true;
96 } else if (newX >= screenRect.right()-1 && newY >= screenRect.bottom()-1) { // bottom right corner
97 const auto distance = qSqrt(qPow(newX-screenRect.right(), 2) + qPow(newY-screenRect.bottom(), 2));
98 Q_EMIT pushedBottomRightCorner(currentScreen, qAbs(distance), me->buttons());
99 m_pushing = true;
100 } else if (newX < screenRect.left()) { // left edge
101 Q_EMIT pushedLeftBoundary(currentScreen, qAbs(newX), me->buttons());
102 m_pushing = true;
103 } else if (newX >= screenRect.right()) { // right edge
104 Q_EMIT pushedRightBoundary(currentScreen, newX - (screenRect.right() - 1), me->buttons());
105 m_pushing = true;
106 } else if (newY < screenRect.top() + pointer->topBoundaryOffset()) { // top edge
107 Q_EMIT pushedTopBoundary(currentScreen, qAbs(newY - screenRect.top() - pointer->topBoundaryOffset()), me->buttons());
108 m_pushing = true;
109 } else if (Q_LIKELY(newX > 0 && newX < screenRect.right()-1 && newY > 0 && newY < screenRect.bottom()-1)) { // normal pos, not pushing
110 if (m_pushing) {
111 Q_EMIT pushStopped(currentScreen);
112 m_pushing = false;
113 }
114 }
115 }
117 // Send the event
118 QMouseEvent eCopy(me->type(), me->localPos(), newPos, me->button(), me->buttons(), me->modifiers());
119 eCopy.setTimestamp(me->timestamp());
120 o->event(&eCopy);
121 return true;
122 }
123 default:
124 break;
125 }
126 return false;
129QPointF InputDispatcherFilter::adjustedPositionForMovement(const QPointF &pt, const QPointF &movement) const
131 QPointF adjusted = pt + movement;
133 auto screen = screenAt(adjusted); // first check if our move was to a screen with an enabled pointer.
134 if (screen) {
135 return adjusted;
136 } else if ((screen = screenAt(pt))) { // then check if our old position was valid
137 QRectF screenBounds = screen->geometry();
138 // bound the new position to the old screen geometry
139 adjusted.rx() = qMax(screenBounds.left(), qMin(adjusted.x(), screenBounds.right()-1));
140 adjusted.ry() = qMax(screenBounds.top(), qMin(adjusted.y(), screenBounds.bottom()-1));
141 } else {
142 auto screens = QGuiApplication::screens();
144 // center of first screen with a pointer.
145 Q_FOREACH(QScreen* screen, screens) {
146 Q_FOREACH(MousePointer* pointer, m_pointers) {
147 if (pointer->isEnabled() && pointer->screen() == screen) {
148 return screen->geometry().center();
149 }
150 }
151 }
152 }
153 return adjusted;
156QScreen *InputDispatcherFilter::screenAt(const QPointF &pt) const
158 Q_FOREACH(MousePointer* pointer, m_pointers) {
159 if (!pointer->isEnabled()) continue;
161 QScreen* screen = pointer->screen();
162 if (screen && screen->geometry().contains(pt.toPoint()))
163 return screen;
164 }
165 return nullptr;
168MousePointer *InputDispatcherFilter::currentPointer() const
170 Q_FOREACH(MousePointer* pointer, m_pointers) {
171 if (!pointer->isEnabled()) continue;
172 return pointer;
173 }
174 return nullptr;