Lomiri
InputDispatcherFilter.h
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 #ifndef INPUTDISPATCHERFILTER_H
18 #define INPUTDISPATCHERFILTER_H
19 
20 #include <QObject>
21 #include <QPointF>
22 #include <QSet>
23 
24 class MousePointer;
25 class QScreen;
26 
27 class InputDispatcherFilter : public QObject
28 {
29  Q_OBJECT
30 public:
31  static InputDispatcherFilter *instance();
32 
33  void registerPointer(MousePointer* pointer);
34  void unregisterPointer(MousePointer* pointer);
35 
36 Q_SIGNALS:
37  void pushedLeftBoundary(QScreen* screen, qreal amount, Qt::MouseButtons buttons);
38  void pushedRightBoundary(QScreen* screen, qreal amount, Qt::MouseButtons buttons);
39  void pushedTopBoundary(QScreen* screen, qreal amount, Qt::MouseButtons buttons);
40  void pushedTopLeftCorner(QScreen* screen, qreal amount, Qt::MouseButtons buttons);
41  void pushedTopRightCorner(QScreen* screen, qreal amount, Qt::MouseButtons buttons);
42  void pushedBottomLeftCorner(QScreen* screen, qreal amount, Qt::MouseButtons buttons);
43  void pushedBottomRightCorner(QScreen* screen, qreal amount, Qt::MouseButtons buttons);
44  void pushStopped(QScreen* screen);
45 
46 protected:
47  InputDispatcherFilter(QObject* parent = nullptr);
48 
49  bool eventFilter(QObject *o, QEvent *e) override;
50 
51  QPointF adjustedPositionForMovement(const QPointF& pt, const QPointF& movement) const;
52  QScreen* screenAt(const QPointF& pt) const;
53 
54  MousePointer* currentPointer() const;
55 
56 private:
57  QObject* m_inputDispatcher;
58  QSet<MousePointer*> m_pointers;
59  bool m_pushing;
60 };
61 
62 #endif // INPUTDISPATCHERFILTER_H