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.hpp"
  22 #include "view.hpp"
  23
  24 #include "signal.hpp"
  25 #include "tracegroup.hpp"
  26
  27 #include <cassert>
  28 #include <algorithm>
  29
  30 #include <boost/iterator/filter_iterator.hpp>
  31
  32 #include <QApplication>
  33 #include <QMenu>
  34 #include <QMouseEvent>
  35 #include <QPainter>
  36 #include <QRect>
  37
  38 #include <pv/session.hpp>
  39 #include <pv/widgets/popup.hpp>
  40
  41 using boost::make_filter_iterator;
  42 using std::dynamic_pointer_cast;
  43 using std::max;
  44 using std::make_pair;
  45 using std::min;
  46 using std::pair;
  47 using std::shared_ptr;
  48 using std::stable_sort;
  49 using std::vector;
  50
  51 namespace pv {
  52 namespace view {
  53
  54 const int Header::Padding = 12;
  55 const int Header::BaselineOffset = 5;
  56
  57 static bool item_selected(shared_ptr<RowItem> r)
  58 {
  59         return r->selected();
  60 }
  61
  62 Header::Header(View &parent) :
  63         MarginWidget(parent)
  64 {
  65         connect(&view_, SIGNAL(signals_moved()),
  66                 this, SLOT(on_signals_moved()));
  67 }
  68
  69 QSize Header::sizeHint() const
  70 {
  71         QRectF max_rect(-Padding, 0, Padding, 0);
  72         for (auto &i : view_)
  73                 if (i->enabled())
  74                         max_rect = max_rect.united(i->label_rect(QRect()));
  75         return QSize(max_rect.width() + Padding + BaselineOffset, 0);
  76 }
  77
  78 QSize Header::extended_size_hint() const
  79 {
  80         return sizeHint() + QSize(ViewItem::HighlightRadius, 0);
  81 }
  82
  83 shared_ptr<RowItem> Header::get_mouse_over_item(const QPoint &pt)
  84 {
  85         const QRect r(0, 0, width() - BaselineOffset, height());
  86         for (auto &i : view_)
  87                 if (i->enabled() && i->label_rect(r).contains(pt))
  88                         return i;
  89         return shared_ptr<RowItem>();
  90 }
  91
  92 void Header::clear_selection()
  93 {
  94         for (auto &i : view_)
  95                 i->select(false);
  96         update();
  97 }
  98
  99 void Header::paintEvent(QPaintEvent*)
 100 {
 101         // The trace labels are not drawn with the arrows exactly on the
 102         // left edge of the widget, because then the selection shadow
 103         // would be clipped away.
 104         const QRect rect(0, 0, width() - BaselineOffset, height());
 105
 106         vector< shared_ptr<RowItem> > row_items(
 107                 view_.begin(), view_.end());
 108
 109         stable_sort(row_items.begin(), row_items.end(),
 110                 [](const shared_ptr<RowItem> &a, const shared_ptr<RowItem> &b) {
 111                         return a->visual_v_offset() < b->visual_v_offset(); });
 112
 113         QPainter painter(this);
 114         painter.setRenderHint(QPainter::Antialiasing);
 115
 116         for (const shared_ptr<RowItem> r : row_items)
 117         {
 118                 assert(r);
 119
 120                 const bool highlight = !dragging_ &&
 121                         r->label_rect(rect).contains(mouse_point_);
 122                 r->paint_label(painter, rect, highlight);
 123         }
 124
 125         painter.end();
 126 }
 127
 128 void Header::mouseLeftPressEvent(QMouseEvent *event)
 129 {
 130         (void)event;
 131
 132         const bool ctrl_pressed =
 133                 QApplication::keyboardModifiers() & Qt::ControlModifier;
 134
 135         // Clear selection if control is not pressed and this item is unselected
 136         if ((!mouse_down_item_ || !mouse_down_item_->selected()) &&
 137                 !ctrl_pressed)
 138                 for (shared_ptr<RowItem> r : view_)
 139                         r->select(false);
 140
 141         // Set the signal selection state if the item has been clicked
 142         if (mouse_down_item_) {
 143                 if (ctrl_pressed)
 144                         mouse_down_item_->select(!mouse_down_item_->selected());
 145                 else
 146                         mouse_down_item_->select(true);
 147         }
 148
 149         // Save the offsets of any signals which will be dragged
 150         for (const shared_ptr<RowItem> r : view_)
 151                 if (r->selected())
 152                         r->drag();
 153
 154         selection_changed();
 155         update();
 156 }
 157
 158 void Header::mousePressEvent(QMouseEvent *event)
 159 {
 160         assert(event);
 161
 162         mouse_down_point_ = event->pos();
 163         mouse_down_item_ = get_mouse_over_item(event->pos());
 164
 165         if (event->button() & Qt::LeftButton)
 166                 mouseLeftPressEvent(event);
 167 }
 168
 169 void Header::mouseLeftReleaseEvent(QMouseEvent *event)
 170 {
 171         assert(event);
 172
 173         const bool ctrl_pressed =
 174                 QApplication::keyboardModifiers() & Qt::ControlModifier;
 175
 176         // Unselect everything if control is not pressed
 177         const shared_ptr<RowItem> mouse_over =
 178                 get_mouse_over_item(event->pos());
 179
 180         for (auto &r : view_)
 181                 r->drag_release();
 182
 183         if (dragging_)
 184                 view_.restack_all_row_items();
 185         else
 186         {
 187                 if (!ctrl_pressed) {
 188                         for (shared_ptr<RowItem> r : view_)
 189                                 if (mouse_down_item_ != r)
 190                                         r->select(false);
 191
 192                         if (mouse_down_item_)
 193                                 show_popup(mouse_down_item_);
 194                 }
 195         }
 196
 197         dragging_ = false;
 198 }
 199
 200 void Header::mouseReleaseEvent(QMouseEvent *event)
 201 {
 202         assert(event);
 203         if (event->button() & Qt::LeftButton)
 204                 mouseLeftReleaseEvent(event);
 205
 206         mouse_down_item_ = nullptr;
 207 }
 208
 209 void Header::mouseMoveEvent(QMouseEvent *event)
 210 {
 211         assert(event);
 212         mouse_point_ = event->pos();
 213
 214         if (!(event->buttons() & Qt::LeftButton))
 215                 return;
 216
 217         if ((event->pos() - mouse_down_point_).manhattanLength() <
 218                 QApplication::startDragDistance())
 219                 return;
 220
 221         // Check all the drag items share a common owner
 222         RowItemOwner *item_owner = nullptr;
 223         for (shared_ptr<RowItem> r : view_)
 224                 if (r->dragging()) {
 225                         if (!item_owner)
 226                                 item_owner = r->owner();
 227                         else if(item_owner != r->owner())
 228                                 return;
 229                 }
 230
 231         if (!item_owner)
 232                 return;
 233
 234         // Do the drag
 235         dragging_ = true;
 236
 237         const QPoint delta = event->pos() - mouse_down_point_;
 238
 239         for (std::shared_ptr<RowItem> r : view_)
 240                 if (r->dragging()) {
 241                         r->drag_by(delta);
 242
 243                         // Ensure the trace is selected
 244                         r->select();
 245                 }
 246
 247         item_owner->restack_items();
 248         for (const auto &r : *item_owner)
 249                 r->animate_to_layout_v_offset();
 250         signals_moved();
 251
 252         update();
 253 }
 254
 255 void Header::contextMenuEvent(QContextMenuEvent *event)
 256 {
 257         const shared_ptr<RowItem> r = get_mouse_over_item(mouse_point_);
 258         if (!r)
 259                 return;
 260
 261         QMenu *menu = r->create_context_menu(this);
 262         if (!menu)
 263                 menu = new QMenu(this);
 264
 265         if (std::count_if(view_.begin(), view_.end(), item_selected) > 1)
 266         {
 267                 menu->addSeparator();
 268
 269                 QAction *const group = new QAction(tr("Group"), this);
 270                 QList<QKeySequence> shortcuts;
 271                 shortcuts.append(QKeySequence(Qt::ControlModifier | Qt::Key_G));
 272                 group->setShortcuts(shortcuts);
 273                 connect(group, SIGNAL(triggered()), this, SLOT(on_group()));
 274                 menu->addAction(group);
 275         }
 276
 277         menu->exec(event->globalPos());
 278 }
 279
 280 void Header::keyPressEvent(QKeyEvent *e)
 281 {
 282         assert(e);
 283
 284         if (e->key() == Qt::Key_Delete)
 285         {
 286                 for (const shared_ptr<RowItem> r : view_)
 287                         if (r->selected())
 288                                 r->delete_pressed();
 289         }
 290         else if (e->key() == Qt::Key_G && e->modifiers() == Qt::ControlModifier)
 291                 on_group();
 292         else if (e->key() == Qt::Key_U && e->modifiers() == Qt::ControlModifier)
 293                 on_ungroup();
 294 }
 295
 296 void Header::on_signals_moved()
 297 {
 298         update();
 299 }
 300
 301 void Header::on_group()
 302 {
 303         vector< shared_ptr<RowItem> > selected_items(
 304                 make_filter_iterator(item_selected, view_.begin(), view_.end()),
 305                 make_filter_iterator(item_selected, view_.end(), view_.end()));
 306         stable_sort(selected_items.begin(), selected_items.end(),
 307                 [](const shared_ptr<RowItem> &a, const shared_ptr<RowItem> &b) {
 308                         return a->visual_v_offset() < b->visual_v_offset(); });
 309
 310         shared_ptr<TraceGroup> group(new TraceGroup());
 311         shared_ptr<RowItem> mouse_down_item(
 312                 std::dynamic_pointer_cast<RowItem>(mouse_down_item_));
 313         shared_ptr<RowItem> focus_item(
 314                 mouse_down_item ? mouse_down_item : selected_items.front());
 315
 316         assert(focus_item);
 317         assert(focus_item->owner());
 318         focus_item->owner()->add_child_item(group);
 319
 320         // Set the group v_offset here before reparenting
 321         group->force_to_v_offset(focus_item->layout_v_offset() +
 322                 focus_item->v_extents().first);
 323
 324         for (size_t i = 0; i < selected_items.size(); i++) {
 325                 const shared_ptr<RowItem> &r = selected_items[i];
 326                 assert(r->owner());
 327                 r->owner()->remove_child_item(r);
 328                 group->add_child_item(r);
 329
 330                 // Put the items at 1-pixel offsets, so that restack will
 331                 // stack them in the right order
 332                 r->set_layout_v_offset(i);
 333         }
 334 }
 335
 336 void Header::on_ungroup()
 337 {
 338         bool restart;
 339         do {
 340                 restart = false;
 341                 for (const shared_ptr<RowItem> r : view_) {
 342                         const shared_ptr<TraceGroup> tg =
 343                                 dynamic_pointer_cast<TraceGroup>(r);
 344                         if (tg && tg->selected()) {
 345                                 tg->ungroup();
 346                                 restart = true;
 347                                 break;
 348                         }
 349                 }
 350         } while(restart);
 351 }
 352
 353 } // namespace view
 354 } // namespace pv