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.session(), SIGNAL(signals_changed()),
  59                 this, SLOT(on_signals_changed()));
  60
  61         connect(&_view, SIGNAL(signals_moved()),
  62                 this, SLOT(on_signals_moved()));
  63
  64         // Trigger the initial event manually. The default device has signals
  65         // which were created before this object came into being
  66         on_signals_changed();
  67 }
  68
  69 QSize Header::sizeHint() const
  70 {
  71         int max_width = 0;
  72
  73         for (auto &i : _view)
  74                 if (i->enabled())
  75                         max_width = max(max_width, (int)i->label_rect(0).width());
  76
  77         return QSize(max_width + Padding + BaselineOffset, 0);
  78 }
  79
  80 shared_ptr<RowItem> Header::get_mouse_over_row_item(const QPoint &pt)
  81 {
  82         const int w = width() - BaselineOffset;
  83         for (auto &i : _view)
  84                 if (i->enabled() && i->label_rect(w).contains(pt))
  85                         return i;
  86         return shared_ptr<RowItem>();
  87 }
  88
  89 void Header::clear_selection()
  90 {
  91         for (auto &i : _view)
  92                 i->select(false);
  93         update();
  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         const bool dragging = !_drag_row_items.empty();
 127         for (const shared_ptr<RowItem> r : row_items)
 128         {
 129                 assert(r);
 130
 131                 const bool highlight = !dragging &&
 132                         r->label_rect(w).contains(_mouse_point);
 133                 r->paint_label(painter, w, highlight);
 134         }
 135
 136         painter.end();
 137 }
 138
 139 void Header::mousePressEvent(QMouseEvent *event)
 140 {
 141         assert(event);
 142
 143         if (event->button() & Qt::LeftButton) {
 144                 _mouse_down_point = event->pos();
 145
 146                 // Save the offsets of any signals which will be dragged
 147                 for (const shared_ptr<RowItem> r : _view)
 148                         if (r->selected())
 149                                 _drag_row_items.push_back(
 150                                         make_pair(r, r->v_offset()));
 151         }
 152
 153         // Select the signal if it has been clicked
 154         const shared_ptr<RowItem> mouse_over_row_item =
 155                 get_mouse_over_row_item(event->pos());
 156         if (mouse_over_row_item) {
 157                 if (mouse_over_row_item->selected())
 158                         mouse_over_row_item->select(false);
 159                 else {
 160                         mouse_over_row_item->select(true);
 161
 162                         if (~QApplication::keyboardModifiers() &
 163                                 Qt::ControlModifier)
 164                                 _drag_row_items.clear();
 165
 166                         // Add the signal to the drag list
 167                         if (event->button() & Qt::LeftButton)
 168                                 _drag_row_items.push_back(
 169                                         make_pair(mouse_over_row_item,
 170                                         mouse_over_row_item->v_offset()));
 171                 }
 172         }
 173
 174         if (~QApplication::keyboardModifiers() & Qt::ControlModifier) {
 175                 // Unselect all other signals because the Ctrl is not
 176                 // pressed
 177                 for (const shared_ptr<RowItem> r : _view)
 178                         if (r != mouse_over_row_item)
 179                                 r->select(false);
 180         }
 181
 182         selection_changed();
 183         update();
 184 }
 185
 186 void Header::mouseReleaseEvent(QMouseEvent *event)
 187 {
 188         assert(event);
 189         if (event->button() == Qt::LeftButton) {
 190                 if (_dragging)
 191                         _view.normalize_layout();
 192                 else
 193                 {
 194                         const shared_ptr<RowItem> mouse_over_row_item =
 195                                 get_mouse_over_row_item(event->pos());
 196                         if (mouse_over_row_item)
 197                                 show_popup(mouse_over_row_item);
 198                 }
 199
 200                 _dragging = false;
 201                 _drag_row_items.clear();
 202         }
 203 }
 204
 205 void Header::mouseMoveEvent(QMouseEvent *event)
 206 {
 207         assert(event);
 208         _mouse_point = event->pos();
 209
 210         if (!(event->buttons() & Qt::LeftButton))
 211                 return;
 212
 213         if ((event->pos() - _mouse_down_point).manhattanLength() <
 214                 QApplication::startDragDistance())
 215                 return;
 216
 217         // Move the signals if we are dragging
 218         if (!_drag_row_items.empty())
 219         {
 220                 _dragging = true;
 221
 222                 const int delta = event->pos().y() - _mouse_down_point.y();
 223
 224                 for (auto i = _drag_row_items.begin();
 225                         i != _drag_row_items.end(); i++) {
 226                         const std::shared_ptr<RowItem> row_item((*i).first);
 227                         if (row_item) {
 228                                 const int y = (*i).second + delta;
 229                                 const int y_snap =
 230                                         ((y + View::SignalSnapGridSize / 2) /
 231                                                 View::SignalSnapGridSize) *
 232                                                 View::SignalSnapGridSize;
 233                                 row_item->set_v_offset(y_snap);
 234
 235                                 // Ensure the trace is selected
 236                                 row_item->select();
 237                         }
 238
 239                 }
 240
 241                 signals_moved();
 242         }
 243
 244         update();
 245 }
 246
 247 void Header::leaveEvent(QEvent*)
 248 {
 249         _mouse_point = QPoint(-1, -1);
 250         update();
 251 }
 252
 253 void Header::contextMenuEvent(QContextMenuEvent *event)
 254 {
 255         const shared_ptr<RowItem> r = get_mouse_over_row_item(_mouse_point);
 256         if (!r)
 257                 return;
 258
 259         QMenu *const menu = r->create_context_menu(this);
 260         if (!menu)
 261                 return;
 262
 263         menu->exec(event->globalPos());
 264 }
 265
 266 void Header::keyPressEvent(QKeyEvent *e)
 267 {
 268         assert(e);
 269
 270         switch (e->key())
 271         {
 272         case Qt::Key_Delete:
 273         {
 274                 for (const shared_ptr<RowItem> r : _view)
 275                         if (r->selected())
 276                                 r->delete_pressed();
 277                 break;
 278         }
 279         }
 280 }
 281
 282 void Header::on_signals_changed()
 283 {
 284         for (shared_ptr<RowItem> r : _view) {
 285                 assert(r);
 286                 connect(r.get(), SIGNAL(visibility_changed()),
 287                         this, SLOT(on_trace_changed()));
 288                 connect(r.get(), SIGNAL(text_changed()),
 289                         this, SLOT(on_trace_changed()));
 290                 connect(r.get(), SIGNAL(colour_changed()),
 291                         this, SLOT(update()));
 292         }
 293 }
 294
 295 void Header::on_signals_moved()
 296 {
 297         update();
 298 }
 299
 300 void Header::on_trace_changed()
 301 {
 302         update();
 303         geometry_updated();
 304 }
 305
 306 } // namespace view
 307 } // namespace pv