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
ViewWidget(View & parent)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
clear_selection()46 void ViewWidget::clear_selection()
47 {
48 const auto items = this->items();
49 for (auto &i : items)
50 i->select(false);
51 }
52
item_hover(const shared_ptr<ViewItem> & item,QPoint pos)53 void ViewWidget::item_hover(const shared_ptr<ViewItem> &item, QPoint pos)
54 {
55 (void)item;
56 (void)pos;
57 }
58
item_clicked(const shared_ptr<ViewItem> & item)59 void ViewWidget::item_clicked(const shared_ptr<ViewItem> &item)
60 {
61 (void)item;
62 }
63
accept_drag() const64 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 (const 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
mouse_down() const97 bool ViewWidget::mouse_down() const
98 {
99 return mouse_down_point_.x() != INT_MIN &&
100 mouse_down_point_.y() != INT_MIN;
101 }
102
drag_items(const QPoint & delta)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<ViewItem> > row_items(
109 view_.list_by_type<ViewItem>());
110 for (const shared_ptr<ViewItem>& 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 (const 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
drag()147 void ViewWidget::drag()
148 {
149 }
150
drag_by(const QPoint & delta)151 void ViewWidget::drag_by(const QPoint &delta)
152 {
153 (void)delta;
154 }
155
drag_release()156 void ViewWidget::drag_release()
157 {
158 }
159
mouse_left_press_event(QMouseEvent * event)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
mouse_left_release_event(QMouseEvent * event)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
touch_event(QTouchEvent * event)227 bool ViewWidget::touch_event(QTouchEvent *event)
228 {
229 (void)event;
230
231 return false;
232 }
233
event(QEvent * event)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
mousePressEvent(QMouseEvent * event)251 void ViewWidget::mousePressEvent(QMouseEvent *event)
252 {
253 assert(event);
254
255 if (event->button() & Qt::LeftButton) {
256 if (event->modifiers() & Qt::ShiftModifier)
257 view_.show_cursors(false);
258
259 mouse_down_point_ = event->pos();
260 mouse_down_offset_ = view_.offset() + event->pos().x() * view_.scale();
261 mouse_down_item_ = get_mouse_over_item(event->pos());
262 mouse_left_press_event(event);
263 }
264
265 /* Don't forward right click events as they will open context menus when
266 * used on trace labels. Those menus prevent ViewWidget::mouseReleaseEvent()
267 * to be triggered upon button release, making mouse_down_item_
268 * hold the last reference to a view item that might have been deleted
269 * from the context menu, preventing it from being freed as intended.
270 * TODO Remove this once context menus are handled separately
271 */
272 if (event->button() & Qt::RightButton)
273 mouse_down_point_ = event->pos();
274 }
275
mouseReleaseEvent(QMouseEvent * event)276 void ViewWidget::mouseReleaseEvent(QMouseEvent *event)
277 {
278 assert(event);
279
280 if (event->button() & Qt::LeftButton)
281 mouse_left_release_event(event);
282
283 mouse_down_point_ = QPoint(INT_MIN, INT_MIN);
284 mouse_down_item_ = nullptr;
285 }
286
keyReleaseEvent(QKeyEvent * event)287 void ViewWidget::keyReleaseEvent(QKeyEvent *event)
288 {
289 // Update mouse_modifiers_ also if modifiers change, but pointer doesn't move
290 if ((mouse_point_.x() >= 0) && (mouse_point_.y() >= 0)) // mouse is inside
291 mouse_modifiers_ = event->modifiers();
292 update();
293 }
294
keyPressEvent(QKeyEvent * event)295 void ViewWidget::keyPressEvent(QKeyEvent *event)
296 {
297 // Update mouse_modifiers_ also if modifiers change, but pointer doesn't move
298 if ((mouse_point_.x() >= 0) && (mouse_point_.y() >= 0)) // mouse is inside
299 mouse_modifiers_ = event->modifiers();
300 update();
301 }
302
mouseMoveEvent(QMouseEvent * event)303 void ViewWidget::mouseMoveEvent(QMouseEvent *event)
304 {
305 assert(event);
306 mouse_point_ = event->pos();
307 mouse_modifiers_ = event->modifiers();
308
309 if (!event->buttons())
310 item_hover(get_mouse_over_item(event->pos()), event->pos());
311
312 if (event->buttons() & Qt::LeftButton) {
313 if (event->modifiers() & Qt::ShiftModifier) {
314 // Cursor drag
315 pv::util::Timestamp current_offset = view_.offset() + event->pos().x() * view_.scale();
316
317 const int drag_distance = qAbs(current_offset.convert_to<double>() -
318 mouse_down_offset_.convert_to<double>()) / view_.scale();
319
320 if (drag_distance > QApplication::startDragDistance()) {
321 view_.show_cursors(true);
322 view_.set_cursors(mouse_down_offset_, current_offset);
323 } else
324 view_.show_cursors(false);
325
326 } else {
327 if (!item_dragging_) {
328 if ((event->pos() - mouse_down_point_).manhattanLength() <
329 QApplication::startDragDistance())
330 return;
331
332 if (!accept_drag())
333 return;
334
335 item_dragging_ = true;
336 }
337
338 // Do the drag
339 drag_items(event->pos() - mouse_down_point_);
340 }
341 }
342
343 // Force a repaint of the widget to update highlighted parts
344 update();
345 }
346
leaveEvent(QEvent *)347 void ViewWidget::leaveEvent(QEvent*)
348 {
349 bool cursor_above_widget = rect().contains(mapFromGlobal(QCursor::pos()));
350
351 // We receive leaveEvent also when the widget loses focus even when
352 // the mouse cursor hasn't moved at all - e.g. when the popup shows.
353 // However, we don't want to reset mouse_position_ when the mouse is
354 // still above this widget as doing so would break the context menu
355 if (!cursor_above_widget)
356 mouse_point_ = QPoint(INT_MIN, INT_MIN);
357
358 mouse_modifiers_ = Qt::NoModifier;
359 item_hover(nullptr, QPoint());
360
361 update();
362 }
363
364 } // namespace trace
365 } // namespace views
366 } // namespace pv
367