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Header: Keep a shared_ptr of the clicked item
[pulseview.git] / pv / view / header.cpp
1 /*
2  * This file is part of the PulseView project.
3  *
4  * Copyright (C) 2012 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 #include "header.h"
22 #include "view.h"
23
24 #include "signal.h"
25 #include "../sigsession.h"
26
27 #include <cassert>
28 #include <algorithm>
29
30 #include <QApplication>
31 #include <QMenu>
32 #include <QMouseEvent>
33 #include <QPainter>
34 #include <QRect>
35
36 #include <pv/widgets/popup.h>
37
38 using std::max;
39 using std::make_pair;
40 using std::pair;
41 using std::shared_ptr;
42 using std::stable_sort;
43 using std::vector;
44
45 namespace pv {
46 namespace view {
47
48 const int Header::Padding = 12;
49 const int Header::BaselineOffset = 5;
50
51 Header::Header(View &parent) :
52         MarginWidget(parent),
53         _dragging(false)
54 {
55         setFocusPolicy(Qt::ClickFocus);
56         setMouseTracking(true);
57
58         connect(&_view, SIGNAL(signals_moved()),
59                 this, SLOT(on_signals_moved()));
60 }
61
62 QSize Header::sizeHint() const
63 {
64         QRectF max_rect(-Padding, 0, Padding, 0);
65         for (auto &i : _view)
66                 if (i->enabled())
67                         max_rect = max_rect.united(i->label_rect(0));
68         return QSize(max_rect.width() + Padding + BaselineOffset, 0);
69 }
70
71 shared_ptr<RowItem> Header::get_mouse_over_row_item(const QPoint &pt)
72 {
73         const int w = width() - BaselineOffset;
74         for (auto &i : _view)
75                 if (i->enabled() && i->label_rect(w).contains(pt))
76                         return i;
77         return shared_ptr<RowItem>();
78 }
79
80 void Header::clear_selection()
81 {
82         for (auto &i : _view)
83                 i->select(false);
84         update();
85 }
86
87 void Header::signals_updated()
88 {
89         for (shared_ptr<RowItem> r : _view) {
90                 assert(r);
91                 connect(r.get(), SIGNAL(appearance_changed()),
92                         this, SLOT(on_trace_changed()));
93         }
94 }
95
96 void Header::show_popup(const shared_ptr<RowItem> &item)
97 {
98         using pv::widgets::Popup;
99
100         Popup *const p = item->create_popup(&_view);
101         if (!p)
102                 return;
103
104         const QPoint pt(width() - BaselineOffset, item->get_y());
105         p->set_position(mapToGlobal(pt), Popup::Right);
106         p->show();
107 }
108
109 void Header::paintEvent(QPaintEvent*)
110 {
111         // The trace labels are not drawn with the arrows exactly on the
112         // left edge of the widget, because then the selection shadow
113         // would be clipped away.
114         const int w = width() - BaselineOffset;
115
116         vector< shared_ptr<RowItem> > row_items(
117                 _view.begin(), _view.end());
118
119         stable_sort(row_items.begin(), row_items.end(),
120                 [](const shared_ptr<RowItem> &a, const shared_ptr<RowItem> &b) {
121                         return a->v_offset() < b->v_offset(); });
122
123         QPainter painter(this);
124         painter.setRenderHint(QPainter::Antialiasing);
125
126         for (const shared_ptr<RowItem> r : row_items)
127         {
128                 assert(r);
129
130                 const bool highlight = !_dragging &&
131                         r->label_rect(w).contains(_mouse_point);
132                 r->paint_label(painter, w, highlight);
133         }
134
135         painter.end();
136 }
137
138 void Header::mouseLeftPressEvent(QMouseEvent *event)
139 {
140         (void)event;
141
142         const bool ctrl_pressed =
143                 QApplication::keyboardModifiers() & Qt::ControlModifier;
144
145         // Clear selection if control is not pressed and this item is unselected
146         if ((!_mouse_down_item || !_mouse_down_item->selected()) &&
147                 !ctrl_pressed)
148                 for (shared_ptr<RowItem> r : _view)
149                         r->select(false);
150
151         // Set the signal selection state if the item has been clicked
152         if (_mouse_down_item) {
153                 if (ctrl_pressed)
154                         _mouse_down_item->select(!_mouse_down_item->selected());
155                 else
156                         _mouse_down_item->select(true);
157         }
158
159         // Save the offsets of any signals which will be dragged
160         for (const shared_ptr<RowItem> r : _view)
161                 if (r->selected())
162                         r->drag();
163
164         selection_changed();
165         update();
166 }
167
168 void Header::mousePressEvent(QMouseEvent *event)
169 {
170         assert(event);
171
172         _mouse_down_point = event->pos();
173         _mouse_down_item = get_mouse_over_row_item(event->pos());
174
175         if (event->button() & Qt::LeftButton)
176                 mouseLeftPressEvent(event);
177 }
178
179 void Header::mouseLeftReleaseEvent(QMouseEvent *event)
180 {
181         assert(event);
182
183         const bool ctrl_pressed =
184                 QApplication::keyboardModifiers() & Qt::ControlModifier;
185
186         // Unselect everything if control is not pressed
187         const shared_ptr<RowItem> mouse_over =
188                 get_mouse_over_row_item(event->pos());
189
190         for (auto &r : _view)
191                 r->drag_release();
192
193         if (_dragging)
194                 _view.normalize_layout();
195         else
196         {
197                 if (!ctrl_pressed) {
198                         for (shared_ptr<RowItem> r : _view)
199                                 if (_mouse_down_item != r)
200                                         r->select(false);
201
202                         if (_mouse_down_item)
203                                 show_popup(_mouse_down_item);
204                 }
205         }
206
207         _dragging = false;
208 }
209
210 void Header::mouseReleaseEvent(QMouseEvent *event)
211 {
212         assert(event);
213         if (event->button() & Qt::LeftButton)
214                 mouseLeftReleaseEvent(event);
215
216         _mouse_down_item = nullptr;
217 }
218
219 void Header::mouseMoveEvent(QMouseEvent *event)
220 {
221         assert(event);
222         _mouse_point = event->pos();
223
224         if (!(event->buttons() & Qt::LeftButton))
225                 return;
226
227         if ((event->pos() - _mouse_down_point).manhattanLength() <
228                 QApplication::startDragDistance())
229                 return;
230
231         // Check all the drag items share a common owner
232         RowItemOwner *item_owner = nullptr;
233         for (shared_ptr<RowItem> r : _view)
234                 if (r->dragging()) {
235                         if (!item_owner)
236                                 item_owner = r->owner();
237                         else if(item_owner != r->owner())
238                                 return;
239                 }
240
241         if (!item_owner)
242                 return;
243
244         // Do the drag
245         _dragging = true;
246
247         const int delta = event->pos().y() - _mouse_down_point.y();
248
249         for (std::shared_ptr<RowItem> r : _view)
250                 if (r->dragging()) {
251                         r->set_v_offset(r->drag_point().y() + delta);
252
253                         // Ensure the trace is selected
254                         r->select();
255                 }
256
257         signals_moved();
258
259         update();
260 }
261
262 void Header::leaveEvent(QEvent*)
263 {
264         _mouse_point = QPoint(-1, -1);
265         update();
266 }
267
268 void Header::contextMenuEvent(QContextMenuEvent *event)
269 {
270         const shared_ptr<RowItem> r = get_mouse_over_row_item(_mouse_point);
271         if (!r)
272                 return;
273
274         QMenu *const menu = r->create_context_menu(this);
275         if (!menu)
276                 return;
277
278         menu->exec(event->globalPos());
279 }
280
281 void Header::keyPressEvent(QKeyEvent *e)
282 {
283         assert(e);
284
285         switch (e->key())
286         {
287         case Qt::Key_Delete:
288         {
289                 for (const shared_ptr<RowItem> r : _view)
290                         if (r->selected())
291                                 r->delete_pressed();
292                 break;
293         }
294         }
295 }
296
297 void Header::on_signals_moved()
298 {
299         update();
300 }
301
302 void Header::on_trace_changed()
303 {
304         update();
305         geometry_updated();
306 }
307
308 } // namespace view
309 } // namespace pv