Unity 8
MousePointer.cpp
1 /*
2  * Copyright (C) 2015 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 "MousePointer.h"
18 #include "CursorImageProvider.h"
19 
20 // Unity API
21 #include <unity/shell/application/MirPlatformCursor.h>
22 
23 #include <QQuickWindow>
24 #include <QGuiApplication>
25 
26 #include <qpa/qwindowsysteminterface.h>
27 
28 MousePointer::MousePointer(QQuickItem *parent)
29  : MirMousePointerInterface(parent)
30  , m_cursorName(QStringLiteral("left_ptr"))
31  , m_themeName(QStringLiteral("default"))
32  , m_hotspotX(0)
33  , m_hotspotY(0)
34 {
35  updateHotspot();
36 }
37 
38 void MousePointer::handleMouseEvent(ulong timestamp, QPointF movement, Qt::MouseButtons buttons,
39  Qt::KeyboardModifiers modifiers)
40 {
41  if (!parentItem()) {
42  return;
43  }
44 
45  if (!movement.isNull()) {
46  Q_EMIT mouseMoved();
47  }
48 
49  qreal newX = x() + movement.x();
50  if (newX < 0) {
51  Q_EMIT pushedLeftBoundary(qAbs(newX), buttons);
52  newX = 0;
53  } else if (newX > parentItem()->width()) {
54  Q_EMIT pushedRightBoundary(newX - parentItem()->width(), buttons);
55  newX = parentItem()->width();
56  }
57  setX(newX);
58 
59  qreal newY = y() + movement.y();
60  if (newY < 0) {
61  newY = 0;
62  } else if (newY > parentItem()->height()) {
63  newY = parentItem()->height();
64  }
65  setY(newY);
66 
67  QPointF scenePosition = mapToItem(nullptr, QPointF(0, 0));
68  QWindowSystemInterface::handleMouseEvent(window(), timestamp, scenePosition /*local*/, scenePosition /*global*/,
69  buttons, modifiers);
70 }
71 
72 void MousePointer::handleWheelEvent(ulong timestamp, QPoint angleDelta, Qt::KeyboardModifiers modifiers)
73 {
74  if (!parentItem()) {
75  return;
76  }
77 
78  QPointF scenePosition = mapToItem(nullptr, QPointF(0, 0));
79  QWindowSystemInterface::handleWheelEvent(window(), timestamp, scenePosition /* local */, scenePosition /* global */,
80  QPoint() /* pixelDelta */, angleDelta, modifiers, Qt::ScrollUpdate);
81 }
82 
83 void MousePointer::itemChange(ItemChange change, const ItemChangeData &value)
84 {
85  if (change == ItemSceneChange) {
86  registerWindow(value.window);
87  }
88 }
89 
90 void MousePointer::registerWindow(QWindow *window)
91 {
92  if (m_registeredWindow && window != m_registeredWindow) {
93  auto previousCursor = dynamic_cast<MirPlatformCursor*>(m_registeredWindow->screen()->handle()->cursor());
94  if (previousCursor) {
95  previousCursor->setMousePointer(nullptr);
96  } else {
97  qCritical("QPlatformCursor is not a MirPlatformCursor! Cursor module only works in a Mir server.");
98  }
99  }
100 
101  m_registeredWindow = window;
102 
103  if (m_registeredWindow) {
104  auto cursor = dynamic_cast<MirPlatformCursor*>(window->screen()->handle()->cursor());
105  if (cursor) {
106  cursor->setMousePointer(this);
107  } else {
108  qCritical("QPlaformCursor is not a MirPlatformCursor! Cursor module only works in Mir.");
109  }
110  }
111 }
112 
113 void MousePointer::setCursorName(const QString &cursorName)
114 {
115  if (cursorName != m_cursorName) {
116  m_cursorName = cursorName;
117  Q_EMIT cursorNameChanged(m_cursorName);
118  updateHotspot();
119  }
120 }
121 
122 void MousePointer::updateHotspot()
123 {
124  QPoint newHotspot = CursorImageProvider::instance()->hotspot(m_themeName, m_cursorName);
125 
126  if (m_hotspotX != newHotspot.x()) {
127  m_hotspotX = newHotspot.x();
128  Q_EMIT hotspotXChanged(m_hotspotX);
129  }
130 
131  if (m_hotspotY != newHotspot.y()) {
132  m_hotspotY = newHotspot.y();
133  Q_EMIT hotspotYChanged(m_hotspotY);
134  }
135 }
136 
137 void MousePointer::setThemeName(const QString &themeName)
138 {
139  if (m_themeName != themeName) {
140  m_themeName = themeName;
141  Q_EMIT themeNameChanged(m_themeName);
142  }
143 }
144 
145 void MousePointer::setCustomCursor(const QCursor &customCursor)
146 {
147  CursorImageProvider::instance()->setCustomCursor(customCursor);
148 }