pv/views/trace/viewwidget.cpp

   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
  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
  46 void ViewWidget::clear_selection()
  47 {
  48         const auto items = this->items();
  49         for (auto &i : items)
  50                 i->select(false);
  51 }
  52
  53 void ViewWidget::item_hover(const shared_ptr<ViewItem> &item, QPoint pos)
  54 {
  55         (void)item;
  56         (void)pos;
  57 }
  58
  59 void ViewWidget::item_clicked(const shared_ptr<ViewItem> &item)
  60 {
  61         (void)item;
  62 }
  63
  64 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
  97 bool ViewWidget::mouse_down() const
  98 {
  99         return mouse_down_point_.x() != INT_MIN &&
 100                 mouse_down_point_.y() != INT_MIN;
 101 }
 102
 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
 147 void ViewWidget::drag()
 148 {
 149 }
 150
 151 void ViewWidget::drag_by(const QPoint &delta)
 152 {
 153         (void)delta;
 154 }
 155
 156 void ViewWidget::drag_release()
 157 {
 158 }
 159
 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
 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
 227 bool ViewWidget::touch_event(QTouchEvent *event)
 228 {
 229         (void)event;
 230
 231         return false;
 232 }
 233
 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
 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                 mouse_down_point_ = event->pos();
 259                 mouse_down_offset_ =  view_.offset() + event->pos().x() * view_.scale();
 260                 mouse_down_item_ = get_mouse_over_item(event->pos());
 261                 mouse_left_press_event(event);
 262         }
 263
 264         /* Don't forward right click events as they will open context menus when
 265          * used on trace labels. Those menus prevent ViewWidget::mouseReleaseEvent()
 266          * to be triggered upon button release, making mouse_down_item_
 267          * hold the last reference to a view item that might have been deleted
 268          * from the context menu, preventing it from being freed as intended.
 269          * TODO Remove this once context menus are handled separately
 270          */
 271         if (event->button() & Qt::RightButton)
 272                 mouse_down_point_ = event->pos();
 273 }
 274
 275 void ViewWidget::mouseReleaseEvent(QMouseEvent *event)
 276 {
 277         assert(event);
 278
 279         if (event->button() & Qt::LeftButton)
 280                 mouse_left_release_event(event);
 281
 282         mouse_down_point_ = QPoint(INT_MIN, INT_MIN);
 283         mouse_down_item_ = nullptr;
 284 }
 285
 286 void ViewWidget::mouseMoveEvent(QMouseEvent *event)
 287 {
 288         assert(event);
 289         mouse_point_ = event->pos();
 290
 291         if (!event->buttons()) {
 292                 item_hover(get_mouse_over_item(event->pos()), event->pos());
 293
 294     } else if (event->buttons() & Qt::LeftButton) {
 295
 296         if (event->modifiers() & Qt::ShiftModifier) { // Cursor drag
 297             pv::util::Timestamp current_offset =  view_.offset() + event->pos().x() * view_.scale();
 298
 299             // TODO: Is startDragDistance the right constant here?
 300             if (qAbs(current_offset - mouse_down_offset_)/view_.scale() > QApplication::startDragDistance()) {
 301                 view_.show_cursors(true);
 302                 view_.set_cursors(mouse_down_offset_, current_offset);
 303
 304             } else {
 305                 view_.show_cursors(false);
 306             }
 307
 308         } else {
 309             if (!item_dragging_) {
 310                 if ((event->pos() - mouse_down_point_).manhattanLength() <
 311                     QApplication::startDragDistance())
 312                     return;
 313
 314                 if (!accept_drag())
 315                     return;
 316
 317                 item_dragging_ = true;
 318             }
 319
 320             // Do the drag
 321             drag_items(event->pos() - mouse_down_point_);
 322         }
 323         }
 324 }
 325
 326 void ViewWidget::leaveEvent(QEvent*)
 327 {
 328         mouse_point_ = QPoint(-1, -1);
 329         update();
 330 }
 331
 332 } // namespace trace
 333 } // namespace views
 334 } // namespace pv