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Viewport: Implemented on-canvas drag
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1/*
2 * This file is part of the PulseView project.
3 *
4 * Copyright (C) 2012 Joel Holdsworth <joel@airwebreathe.org.uk>
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; either version 2 of the License, or
9 * (at your option) any later version.
10 *
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
15 *
16 * You should have received a copy of the GNU General Public License
17 * along with this program; if not, write to the Free Software
18 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
19 */
20
21#ifndef PULSEVIEW_PV_VIEW_VIEWPORT_H
22#define PULSEVIEW_PV_VIEW_VIEWPORT_H
23
24#include <QTimer>
25#include <QTouchEvent>
26
27#include "viewwidget.hpp"
28
29class QPainter;
30class QPaintEvent;
31class Session;
32
33namespace pv {
34namespace view {
35
36class View;
37
38class Viewport : public ViewWidget
39{
40 Q_OBJECT
41
42public:
43 explicit Viewport(View &parent);
44
45private:
46 /**
47 * Gets the first view item which has a hit-box that contains @c pt .
48 * @param pt the point to search with.
49 * @return the view item that has been found, or and empty
50 * @c shared_ptr if no item was found.
51 */
52 std::shared_ptr<pv::view::ViewItem> get_mouse_over_item(
53 const QPoint &pt);
54
55 /**
56 * Sets this item into the dragged state.
57 */
58 void drag();
59
60 /**
61 * Drag the background by the delta offset.
62 * @param delta the drag offset in pixels.
63 */
64 void drag_by(const QPoint &delta);
65
66 /**
67 * Sets this item into the un-dragged state.
68 */
69 void drag_release();
70
71 /**
72 * Gets the items in the view widget.
73 */
74 std::vector< std::shared_ptr<pv::view::ViewItem> > items();
75
76 /**
77 * Handles touch begin update and end events.
78 * @param e the event that triggered this handler.
79 */
80 bool touch_event(QTouchEvent *e);
81
82private:
83 void paintEvent(QPaintEvent *event);
84
85 void mouseDoubleClickEvent(QMouseEvent * event);
86 void wheelEvent(QWheelEvent *event);
87
88private:
89 double drag_offset_;
90
91 double pinch_offset0_;
92 double pinch_offset1_;
93 bool pinch_zoom_active_;
94};
95
96} // namespace view
97} // namespace pv
98
99#endif // PULSEVIEW_PV_VIEW_VIEWPORT_H