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1 | /* | |
2 | * This file is part of the PulseView project. | |
3 | * | |
4 | * Copyright (C) 2014 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 | #include <QApplication> | |
21 | #include <QMouseEvent> | |
22 | #include <QTouchEvent> | |
23 | ||
24 | #include "tracetreeitem.hpp" | |
25 | #include "view.hpp" | |
26 | #include "viewwidget.hpp" | |
27 | ||
28 | using std::any_of; | |
29 | using std::shared_ptr; | |
30 | using std::vector; | |
31 | ||
32 | namespace pv { | |
33 | namespace views { | |
34 | namespace TraceView { | |
35 | ||
36 | ViewWidget::ViewWidget(View &parent) : | |
37 | QWidget(&parent), | |
38 | view_(parent), | |
39 | item_dragging_(false) | |
40 | { | |
41 | setFocusPolicy(Qt::ClickFocus); | |
42 | setAttribute(Qt::WA_AcceptTouchEvents, true); | |
43 | setMouseTracking(true); | |
44 | } | |
45 | ||
46 | void ViewWidget::clear_selection() | |
47 | { | |
48 | const auto items = this->items(); | |
49 | for (auto &i : items) | |
50 | i->select(false); | |
51 | } | |
52 | ||
53 | void ViewWidget::item_hover(const shared_ptr<ViewItem> &item) | |
54 | { | |
55 | (void)item; | |
56 | } | |
57 | ||
58 | void ViewWidget::item_clicked(const shared_ptr<ViewItem> &item) | |
59 | { | |
60 | (void)item; | |
61 | } | |
62 | ||
63 | bool ViewWidget::accept_drag() const | |
64 | { | |
65 | const vector< shared_ptr<TimeItem> > items(view_.time_items()); | |
66 | const vector< shared_ptr<TraceTreeItem> > trace_tree_items( | |
67 | view_.list_by_type<TraceTreeItem>()); | |
68 | ||
69 | const bool any_row_items_selected = any_of( | |
70 | trace_tree_items.begin(), trace_tree_items.end(), | |
71 | [](const shared_ptr<TraceTreeItem> &r) { return r->selected(); }); | |
72 | ||
73 | const bool any_time_items_selected = any_of(items.begin(), items.end(), | |
74 | [](const shared_ptr<TimeItem> &i) { return i->selected(); }); | |
75 | ||
76 | if (any_row_items_selected && !any_time_items_selected) { | |
77 | // Check all the drag items share a common owner | |
78 | TraceTreeItemOwner *item_owner = nullptr; | |
79 | for (shared_ptr<TraceTreeItem> r : trace_tree_items) | |
80 | if (r->dragging()) { | |
81 | if (!item_owner) | |
82 | item_owner = r->owner(); | |
83 | else if (item_owner != r->owner()) | |
84 | return false; | |
85 | } | |
86 | ||
87 | return true; | |
88 | } else if (any_time_items_selected && !any_row_items_selected) { | |
89 | return true; | |
90 | } | |
91 | ||
92 | // A background drag is beginning | |
93 | return true; | |
94 | } | |
95 | ||
96 | bool ViewWidget::mouse_down() const | |
97 | { | |
98 | return mouse_down_point_.x() != INT_MIN && | |
99 | mouse_down_point_.y() != INT_MIN; | |
100 | } | |
101 | ||
102 | void ViewWidget::drag_items(const QPoint &delta) | |
103 | { | |
104 | bool item_dragged = false; | |
105 | ||
106 | // Drag the row items | |
107 | const vector< shared_ptr<RowItem> > row_items( | |
108 | view_.list_by_type<RowItem>()); | |
109 | for (shared_ptr<RowItem> r : row_items) | |
110 | if (r->dragging()) { | |
111 | r->drag_by(delta); | |
112 | ||
113 | // Ensure the trace is selected | |
114 | r->select(); | |
115 | ||
116 | item_dragged = true; | |
117 | } | |
118 | ||
119 | // If an item is being dragged, update the stacking | |
120 | TraceTreeItemOwner *item_owner = nullptr; | |
121 | const vector< shared_ptr<TraceTreeItem> > trace_tree_items( | |
122 | view_.list_by_type<TraceTreeItem>()); | |
123 | for (shared_ptr<TraceTreeItem> i : trace_tree_items) | |
124 | if (i->dragging()) | |
125 | item_owner = i->owner(); | |
126 | ||
127 | if (item_owner) { | |
128 | item_owner->restack_items(); | |
129 | for (shared_ptr<TraceTreeItem> i : trace_tree_items) | |
130 | i->animate_to_layout_v_offset(); | |
131 | } | |
132 | ||
133 | // Drag the time items | |
134 | const vector< shared_ptr<TimeItem> > items(view_.time_items()); | |
135 | for (auto &i : items) | |
136 | if (i->dragging()) { | |
137 | i->drag_by(delta); | |
138 | item_dragged = true; | |
139 | } | |
140 | ||
141 | // Do the background drag | |
142 | if (!item_dragged) | |
143 | drag_by(delta); | |
144 | } | |
145 | ||
146 | void ViewWidget::drag() | |
147 | { | |
148 | } | |
149 | ||
150 | void ViewWidget::drag_by(const QPoint &delta) | |
151 | { | |
152 | (void)delta; | |
153 | } | |
154 | ||
155 | void ViewWidget::drag_release() | |
156 | { | |
157 | } | |
158 | ||
159 | void ViewWidget::mouse_left_press_event(QMouseEvent *event) | |
160 | { | |
161 | (void)event; | |
162 | ||
163 | const bool ctrl_pressed = | |
164 | QApplication::keyboardModifiers() & Qt::ControlModifier; | |
165 | ||
166 | // Clear selection if control is not pressed and this item is unselected | |
167 | if ((!mouse_down_item_ || !mouse_down_item_->selected()) && | |
168 | !ctrl_pressed) | |
169 | clear_selection(); | |
170 | ||
171 | // Set the signal selection state if the item has been clicked | |
172 | if (mouse_down_item_) { | |
173 | if (ctrl_pressed) | |
174 | mouse_down_item_->select(!mouse_down_item_->selected()); | |
175 | else | |
176 | mouse_down_item_->select(true); | |
177 | } | |
178 | ||
179 | // Save the offsets of any signals which will be dragged | |
180 | bool item_dragged = false; | |
181 | const auto items = this->items(); | |
182 | for (auto &i : items) | |
183 | if (i->selected()) { | |
184 | item_dragged = true; | |
185 | i->drag(); | |
186 | } | |
187 | ||
188 | // Do the background drag | |
189 | if (!item_dragged) | |
190 | drag(); | |
191 | ||
192 | selection_changed(); | |
193 | } | |
194 | ||
195 | void ViewWidget::mouse_left_release_event(QMouseEvent *event) | |
196 | { | |
197 | assert(event); | |
198 | ||
199 | auto items = this->items(); | |
200 | const bool ctrl_pressed = | |
201 | QApplication::keyboardModifiers() & Qt::ControlModifier; | |
202 | ||
203 | // Unselect everything if control is not pressed | |
204 | const shared_ptr<ViewItem> mouse_over = | |
205 | get_mouse_over_item(event->pos()); | |
206 | ||
207 | for (auto &i : items) | |
208 | i->drag_release(); | |
209 | ||
210 | if (item_dragging_) | |
211 | view_.restack_all_trace_tree_items(); | |
212 | else { | |
213 | if (!ctrl_pressed) { | |
214 | for (shared_ptr<ViewItem> i : items) | |
215 | if (mouse_down_item_ != i) | |
216 | i->select(false); | |
217 | ||
218 | if (mouse_down_item_) | |
219 | item_clicked(mouse_down_item_); | |
220 | } | |
221 | } | |
222 | ||
223 | item_dragging_ = false; | |
224 | } | |
225 | ||
226 | bool ViewWidget::touch_event(QTouchEvent *event) | |
227 | { | |
228 | (void)event; | |
229 | ||
230 | return false; | |
231 | } | |
232 | ||
233 | bool ViewWidget::event(QEvent *event) | |
234 | { | |
235 | switch (event->type()) { | |
236 | case QEvent::TouchBegin: | |
237 | case QEvent::TouchUpdate: | |
238 | case QEvent::TouchEnd: | |
239 | if (touch_event(static_cast<QTouchEvent *>(event))) | |
240 | return true; | |
241 | break; | |
242 | ||
243 | default: | |
244 | break; | |
245 | } | |
246 | ||
247 | return QWidget::event(event); | |
248 | } | |
249 | ||
250 | void ViewWidget::mousePressEvent(QMouseEvent *event) | |
251 | { | |
252 | assert(event); | |
253 | ||
254 | /* Ignore right click events as they will open context menus when | |
255 | * used on trace labels. Those menus prevent ViewWidget::mouseReleaseEvent() | |
256 | * to be triggered upon button release, making mouse_down_item_ | |
257 | * hold the last reference to a view item that might have been deleted | |
258 | * from the context menu, preventing it from being freed as intended. | |
259 | */ | |
260 | if (event->button() & Qt::LeftButton) { | |
261 | mouse_down_point_ = event->pos(); | |
262 | mouse_down_item_ = get_mouse_over_item(event->pos()); | |
263 | mouse_left_press_event(event); | |
264 | } | |
265 | } | |
266 | ||
267 | void ViewWidget::mouseReleaseEvent(QMouseEvent *event) | |
268 | { | |
269 | assert(event); | |
270 | ||
271 | if (event->button() & Qt::LeftButton) | |
272 | mouse_left_release_event(event); | |
273 | ||
274 | mouse_down_point_ = QPoint(INT_MIN, INT_MIN); | |
275 | mouse_down_item_ = nullptr; | |
276 | } | |
277 | ||
278 | void ViewWidget::mouseMoveEvent(QMouseEvent *event) | |
279 | { | |
280 | assert(event); | |
281 | mouse_point_ = event->pos(); | |
282 | ||
283 | if (!event->buttons()) | |
284 | item_hover(get_mouse_over_item(event->pos())); | |
285 | else if (event->buttons() & Qt::LeftButton) { | |
286 | if (!item_dragging_) { | |
287 | if ((event->pos() - mouse_down_point_).manhattanLength() < | |
288 | QApplication::startDragDistance()) | |
289 | return; | |
290 | ||
291 | if (!accept_drag()) | |
292 | return; | |
293 | ||
294 | item_dragging_ = true; | |
295 | } | |
296 | ||
297 | // Do the drag | |
298 | drag_items(event->pos() - mouse_down_point_); | |
299 | } | |
300 | } | |
301 | ||
302 | void ViewWidget::leaveEvent(QEvent*) | |
303 | { | |
304 | mouse_point_ = QPoint(-1, -1); | |
305 | update(); | |
306 | } | |
307 | ||
308 | } // namespace TraceView | |
309 | } // namespace views | |
310 | } // namespace pv |