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  qreal newX = x() + movement.x();
46  if (newX < 0) {
47  Q_EMIT pushedLeftBoundary(qAbs(newX), buttons);
48  newX = 0;
49  } else if (newX > parentItem()->width()) {
50  Q_EMIT pushedRightBoundary(newX - parentItem()->width(), buttons);
51  newX = parentItem()->width();
52  }
53  setX(newX);
54 
55  qreal newY = y() + movement.y();
56  if (newY < 0) {
57  newY = 0;
58  } else if (newY > parentItem()->height()) {
59  newY = parentItem()->height();
60  }
61  setY(newY);
62 
63  QPointF scenePosition = mapToItem(nullptr, QPointF(0, 0));
64  QWindowSystemInterface::handleMouseEvent(window(), timestamp, scenePosition /*local*/, scenePosition /*global*/,
65  buttons, modifiers);
66 }
67 
68 void MousePointer::handleWheelEvent(ulong timestamp, QPoint angleDelta, Qt::KeyboardModifiers modifiers)
69 {
70  if (!parentItem()) {
71  return;
72  }
73 
74  QPointF scenePosition = mapToItem(nullptr, QPointF(0, 0));
75  QWindowSystemInterface::handleWheelEvent(window(), timestamp, scenePosition /* local */, scenePosition /* global */,
76  QPoint() /* pixelDelta */, angleDelta, modifiers, Qt::ScrollUpdate);
77 }
78 
79 void MousePointer::itemChange(ItemChange change, const ItemChangeData &value)
80 {
81  if (change == ItemSceneChange) {
82  registerWindow(value.window);
83  }
84 }
85 
86 void MousePointer::registerWindow(QWindow *window)
87 {
88  if (m_registeredWindow && window != m_registeredWindow) {
89  auto previousCursor = dynamic_cast<MirPlatformCursor*>(m_registeredWindow->screen()->handle()->cursor());
90  if (previousCursor) {
91  previousCursor->setMousePointer(nullptr);
92  } else {
93  qCritical("QPlatformCursor is not a MirPlatformCursor! Cursor module only works in a Mir server.");
94  }
95  }
96 
97  m_registeredWindow = window;
98 
99  if (m_registeredWindow) {
100  auto cursor = dynamic_cast<MirPlatformCursor*>(window->screen()->handle()->cursor());
101  if (cursor) {
102  cursor->setMousePointer(this);
103  } else {
104  qCritical("QPlaformCursor is not a MirPlatformCursor! Cursor module only works in Mir.");
105  }
106  }
107 }
108 
109 void MousePointer::setCursorName(const QString &cursorName)
110 {
111  if (cursorName != m_cursorName) {
112  m_cursorName = cursorName;
113  Q_EMIT cursorNameChanged(m_cursorName);
114  updateHotspot();
115  }
116 }
117 
118 void MousePointer::updateHotspot()
119 {
120  QPoint newHotspot = CursorImageProvider::instance()->hotspot(m_themeName, m_cursorName);
121 
122  if (m_hotspotX != newHotspot.x()) {
123  m_hotspotX = newHotspot.x();
124  Q_EMIT hotspotXChanged(m_hotspotX);
125  }
126 
127  if (m_hotspotY != newHotspot.y()) {
128  m_hotspotY = newHotspot.y();
129  Q_EMIT hotspotYChanged(m_hotspotY);
130  }
131 }
132 
133 void MousePointer::setThemeName(const QString &themeName)
134 {
135  if (m_themeName != themeName) {
136  m_themeName = themeName;
137  Q_EMIT themeNameChanged(m_themeName);
138  }
139 }
140 
141 void MousePointer::setCustomCursor(const QCursor &customCursor)
142 {
143  CursorImageProvider::instance()->setCustomCursor(customCursor);
144 }