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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, see <http://www.gnu.org/licenses/>. | |
18 | */ | |
19 | ||
20 | #ifndef PULSEVIEW_PV_VIEWWIDGET_HPP | |
21 | #define PULSEVIEW_PV_VIEWWIDGET_HPP | |
22 | ||
23 | #include <memory> | |
24 | ||
25 | #include <QPoint> | |
26 | #include <QWidget> | |
27 | ||
28 | using std::shared_ptr; | |
29 | using std::vector; | |
30 | ||
31 | class QTouchEvent; | |
32 | ||
33 | namespace pv { | |
34 | namespace views { | |
35 | namespace trace { | |
36 | ||
37 | class View; | |
38 | class ViewItem; | |
39 | ||
40 | class ViewWidget : public QWidget | |
41 | { | |
42 | Q_OBJECT | |
43 | ||
44 | protected: | |
45 | ViewWidget(View &parent); | |
46 | ||
47 | /** | |
48 | * Indicates when a view item is being hovered over. | |
49 | * @param item The item that is being hovered over, or @c nullptr | |
50 | * if no view item is being hovered over. | |
51 | * @remarks the default implementation does nothing. | |
52 | */ | |
53 | virtual void item_hover(const shared_ptr<ViewItem> &item, QPoint pos); | |
54 | ||
55 | /** | |
56 | * Indicates the event an a view item has been clicked. | |
57 | * @param item the view item that has been clicked. | |
58 | * @remarks the default implementation does nothing. | |
59 | */ | |
60 | virtual void item_clicked(const shared_ptr<ViewItem> &item); | |
61 | ||
62 | /** | |
63 | * Returns true if the selection of row items allows dragging. | |
64 | * @return Returns true if the drag is acceptable. | |
65 | */ | |
66 | bool accept_drag() const; | |
67 | ||
68 | /** | |
69 | * Returns true if the mouse button is down. | |
70 | */ | |
71 | bool mouse_down() const; | |
72 | ||
73 | /** | |
74 | * Drag the dragging items by the delta offset. | |
75 | * @param delta the drag offset in pixels. | |
76 | */ | |
77 | void drag_items(const QPoint &delta); | |
78 | ||
79 | /** | |
80 | * Sets this item into the dragged state. | |
81 | */ | |
82 | virtual void drag(); | |
83 | ||
84 | /** | |
85 | * Drag the background by the delta offset. | |
86 | * @param delta the drag offset in pixels. | |
87 | * @remarks The default implementation does nothing. | |
88 | */ | |
89 | virtual void drag_by(const QPoint &delta); | |
90 | ||
91 | /** | |
92 | * Sets this item into the un-dragged state. | |
93 | */ | |
94 | virtual void drag_release(); | |
95 | ||
96 | /** | |
97 | * Gets the items in the view widget. | |
98 | */ | |
99 | virtual vector< shared_ptr<ViewItem> > items() = 0; | |
100 | ||
101 | /** | |
102 | * Gets the first view item which has a hit-box that contains @c pt . | |
103 | * @param pt the point to search with. | |
104 | * @return the view item that has been found, or and empty | |
105 | * @c shared_ptr if no item was found. | |
106 | */ | |
107 | virtual shared_ptr<ViewItem> get_mouse_over_item(const QPoint &pt) = 0; | |
108 | ||
109 | /** | |
110 | * Handles left mouse button press events. | |
111 | * @param event the mouse event that triggered this handler. | |
112 | */ | |
113 | void mouse_left_press_event(QMouseEvent *event); | |
114 | ||
115 | /** | |
116 | * Handles left mouse button release events. | |
117 | * @param event the mouse event that triggered this handler. | |
118 | */ | |
119 | void mouse_left_release_event(QMouseEvent *event); | |
120 | ||
121 | /** | |
122 | * Handles touch begin update and end events. | |
123 | * @param e the event that triggered this handler. | |
124 | */ | |
125 | virtual bool touch_event(QTouchEvent *event); | |
126 | ||
127 | protected: | |
128 | bool event(QEvent *event); | |
129 | ||
130 | void mousePressEvent(QMouseEvent *event); | |
131 | void mouseReleaseEvent(QMouseEvent *event); | |
132 | void mouseMoveEvent(QMouseEvent *event); | |
133 | ||
134 | void leaveEvent(QEvent *event); | |
135 | ||
136 | public Q_SLOTS: | |
137 | void clear_selection(); | |
138 | ||
139 | Q_SIGNALS: | |
140 | void selection_changed(); | |
141 | ||
142 | protected: | |
143 | pv::views::trace::View &view_; | |
144 | QPoint mouse_point_; | |
145 | QPoint mouse_down_point_; | |
146 | shared_ptr<ViewItem> mouse_down_item_; | |
147 | bool item_dragging_; | |
148 | }; | |
149 | ||
150 | } // namespace trace | |
151 | } // namespace views | |
152 | } // namespace pv | |
153 | ||
154 | #endif // PULSEVIEW_PV_VIEWWIDGET_HPP |