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