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         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         // Check the list of dragging items is not empty
 218         if (_drag_row_items.empty())
 219                 return;
 220
 221         // Check all the drag items share a common owner
 222         const shared_ptr<RowItem> first_row_item(
 223                 _drag_row_items.front().first);
 224         for (const auto &r : _drag_row_items) {
 225                 const shared_ptr<RowItem> row_item(r.first);
 226                 assert(row_item);
 227
 228                 if (row_item->owner() != first_row_item->owner())
 229                         return;
 230         }
 231
 232         // Do the drag
 233         _dragging = true;
 234
 235         const int delta = event->pos().y() - _mouse_down_point.y();
 236
 237         for (auto i = _drag_row_items.begin();
 238                 i != _drag_row_items.end(); i++) {
 239                 const std::shared_ptr<RowItem> row_item((*i).first);
 240                 if (row_item) {
 241                         const int y = (*i).second + delta;
 242                         row_item->set_v_offset(y);
 243
 244                         // Ensure the trace is selected
 245                         row_item->select();
 246                 }
 247         }
 248
 249         signals_moved();
 250
 251         update();
 252 }
 253
 254 void Header::leaveEvent(QEvent*)
 255 {
 256         _mouse_point = QPoint(-1, -1);
 257         update();
 258 }
 259
 260 void Header::contextMenuEvent(QContextMenuEvent *event)
 261 {
 262         const shared_ptr<RowItem> r = get_mouse_over_row_item(_mouse_point);
 263         if (!r)
 264                 return;
 265
 266         QMenu *const menu = r->create_context_menu(this);
 267         if (!menu)
 268                 return;
 269
 270         menu->exec(event->globalPos());
 271 }
 272
 273 void Header::keyPressEvent(QKeyEvent *e)
 274 {
 275         assert(e);
 276
 277         switch (e->key())
 278         {
 279         case Qt::Key_Delete:
 280         {
 281                 for (const shared_ptr<RowItem> r : _view)
 282                         if (r->selected())
 283                                 r->delete_pressed();
 284                 break;
 285         }
 286         }
 287 }
 288
 289 void Header::on_signals_moved()
 290 {
 291         update();
 292 }
 293
 294 void Header::on_trace_changed()
 295 {
 296         update();
 297         geometry_updated();
 298 }
 299
 300 } // namespace view
 301 } // namespace pv