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1 | /* | |
2 | * This file is part of the PulseView project. | |
3 | * | |
4 | * Copyright (C) 2013 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_VIEWWIDGET_HPP | |
22 | #define PULSEVIEW_PV_VIEWWIDGET_HPP | |
23 | ||
24 | #include <memory> | |
25 | ||
26 | #include <QWidget> | |
27 | ||
28 | class QTouchEvent; | |
29 | ||
30 | namespace pv { | |
31 | namespace view { | |
32 | ||
33 | class View; | |
34 | class ViewItem; | |
35 | ||
36 | class ViewWidget : public QWidget | |
37 | { | |
38 | Q_OBJECT | |
39 | ||
40 | protected: | |
41 | ViewWidget(View &parent); | |
42 | ||
43 | /** | |
44 | * Indicates when a view item is being hovered over. | |
45 | * @param item The item that is being hovered over, or @c nullptr | |
46 | * if no view item is being hovered over. | |
47 | * @remarks the default implementation does nothing. | |
48 | */ | |
49 | virtual void item_hover( | |
50 | const std::shared_ptr<pv::view::ViewItem> &item); | |
51 | ||
52 | /** | |
53 | * Indicates the event an a view item has been clicked. | |
54 | * @param item the view item that has been clicked. | |
55 | * @remarks the default implementation does nothing. | |
56 | */ | |
57 | virtual void item_clicked( | |
58 | const std::shared_ptr<pv::view::ViewItem> &item); | |
59 | ||
60 | /** | |
61 | * Returns true if the selection of row items allows dragging. | |
62 | * @return Returns true if the drag is acceptable. | |
63 | */ | |
64 | bool accept_drag() const; | |
65 | ||
66 | /** | |
67 | * Returns true if the mouse button is down. | |
68 | */ | |
69 | bool mouse_down() const; | |
70 | ||
71 | /** | |
72 | * Drag the dragging items by the delta offset. | |
73 | * @param delta the drag offset in pixels. | |
74 | */ | |
75 | void drag_items(const QPoint &delta); | |
76 | ||
77 | /** | |
78 | * Sets this item into the dragged state. | |
79 | */ | |
80 | virtual void drag(); | |
81 | ||
82 | /** | |
83 | * Drag the background by the delta offset. | |
84 | * @param delta the drag offset in pixels. | |
85 | * @remarks The default implementation does nothing. | |
86 | */ | |
87 | virtual void drag_by(const QPoint &delta); | |
88 | ||
89 | /** | |
90 | * Sets this item into the un-dragged state. | |
91 | */ | |
92 | virtual void drag_release(); | |
93 | ||
94 | /** | |
95 | * Gets the items in the view widget. | |
96 | */ | |
97 | virtual std::vector< std::shared_ptr<pv::view::ViewItem> > items() = 0; | |
98 | ||
99 | /** | |
100 | * Gets the first view item which has a hit-box that contains @c pt . | |
101 | * @param pt the point to search with. | |
102 | * @return the view item that has been found, or and empty | |
103 | * @c shared_ptr if no item was found. | |
104 | */ | |
105 | virtual std::shared_ptr<pv::view::ViewItem> get_mouse_over_item( | |
106 | const QPoint &pt) = 0; | |
107 | ||
108 | /** | |
109 | * Handles left mouse button press events. | |
110 | * @param event the mouse event that triggered this handler. | |
111 | */ | |
112 | void mouse_left_press_event(QMouseEvent *event); | |
113 | ||
114 | /** | |
115 | * Handles left mouse button release events. | |
116 | * @param event the mouse event that triggered this handler. | |
117 | */ | |
118 | void mouse_left_release_event(QMouseEvent *event); | |
119 | ||
120 | /** | |
121 | * Handles touch begin update and end events. | |
122 | * @param e the event that triggered this handler. | |
123 | */ | |
124 | virtual bool touch_event(QTouchEvent *e); | |
125 | ||
126 | protected: | |
127 | bool event(QEvent *event); | |
128 | ||
129 | void mousePressEvent(QMouseEvent * event); | |
130 | void mouseReleaseEvent(QMouseEvent *event); | |
131 | void mouseMoveEvent(QMouseEvent *event); | |
132 | ||
133 | void leaveEvent(QEvent *event); | |
134 | ||
135 | public Q_SLOTS: | |
136 | void clear_selection(); | |
137 | ||
138 | Q_SIGNALS: | |
139 | void selection_changed(); | |
140 | ||
141 | protected: | |
142 | pv::view::View &view_; | |
143 | QPoint mouse_point_; | |
144 | QPoint mouse_down_point_; | |
145 | std::shared_ptr<ViewItem> mouse_down_item_; | |
146 | bool item_dragging_; | |
147 | }; | |
148 | ||
149 | } // namespace view | |
150 | } // namespace pv | |
151 | ||
152 | #endif // PULSEVIEW_PV_VIEWWIDGET_HPP |