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)
  54 {
  55         (void)item;
  56 }
  57
  58 void ViewWidget::item_clicked(const shared_ptr<ViewItem> &item)
  59 {
  60         (void)item;
  61 }
  62
  63 bool ViewWidget::accept_drag() const
  64 {
  65         const vector< shared_ptr<TimeItem> > items(view_.time_items());
  66         const vector< shared_ptr<TraceTreeItem> > trace_tree_items(
  67                 view_.list_by_type<TraceTreeItem>());
  68
  69         const bool any_row_items_selected = any_of(
  70                 trace_tree_items.begin(), trace_tree_items.end(),
  71                 [](const shared_ptr<TraceTreeItem> &r) { return r->selected(); });
  72
  73         const bool any_time_items_selected = any_of(items.begin(), items.end(),
  74                 [](const shared_ptr<TimeItem> &i) { return i->selected(); });
  75
  76         if (any_row_items_selected && !any_time_items_selected) {
  77                 // Check all the drag items share a common owner
  78                 TraceTreeItemOwner *item_owner = nullptr;
  79                 for (shared_ptr<TraceTreeItem> r : trace_tree_items)
  80                         if (r->dragging()) {
  81                                 if (!item_owner)
  82                                         item_owner = r->owner();
  83                                 else if (item_owner != r->owner())
  84                                         return false;
  85                         }
  86
  87                 return true;
  88         } else if (any_time_items_selected && !any_row_items_selected) {
  89                 return true;
  90         }
  91
  92         // A background drag is beginning
  93         return true;
  94 }
  95
  96 bool ViewWidget::mouse_down() const
  97 {
  98         return mouse_down_point_.x() != INT_MIN &&
  99                 mouse_down_point_.y() != INT_MIN;
 100 }
 101
 102 void ViewWidget::drag_items(const QPoint &delta)
 103 {
 104         bool item_dragged = false;
 105
 106         // Drag the row items
 107         const vector< shared_ptr<RowItem> > row_items(
 108                 view_.list_by_type<RowItem>());
 109         for (shared_ptr<RowItem> r : row_items)
 110                 if (r->dragging()) {
 111                         r->drag_by(delta);
 112
 113                         // Ensure the trace is selected
 114                         r->select();
 115
 116                         item_dragged = true;
 117                 }
 118
 119         // If an item is being dragged, update the stacking
 120         TraceTreeItemOwner *item_owner = nullptr;
 121         const vector< shared_ptr<TraceTreeItem> > trace_tree_items(
 122                 view_.list_by_type<TraceTreeItem>());
 123         for (shared_ptr<TraceTreeItem> i : trace_tree_items)
 124                 if (i->dragging())
 125                         item_owner = i->owner();
 126
 127         if (item_owner) {
 128                 item_owner->restack_items();
 129                 for (shared_ptr<TraceTreeItem> i : trace_tree_items)
 130                         i->animate_to_layout_v_offset();
 131         }
 132
 133         // Drag the time items
 134         const vector< shared_ptr<TimeItem> > items(view_.time_items());
 135         for (auto &i : items)
 136                 if (i->dragging()) {
 137                         i->drag_by(delta);
 138                         item_dragged = true;
 139                 }
 140
 141         // Do the background drag
 142         if (!item_dragged)
 143                 drag_by(delta);
 144 }
 145
 146 void ViewWidget::drag()
 147 {
 148 }
 149
 150 void ViewWidget::drag_by(const QPoint &delta)
 151 {
 152         (void)delta;
 153 }
 154
 155 void ViewWidget::drag_release()
 156 {
 157 }
 158
 159 void ViewWidget::mouse_left_press_event(QMouseEvent *event)
 160 {
 161         (void)event;
 162
 163         const bool ctrl_pressed =
 164                 QApplication::keyboardModifiers() & Qt::ControlModifier;
 165
 166         // Clear selection if control is not pressed and this item is unselected
 167         if ((!mouse_down_item_ || !mouse_down_item_->selected()) &&
 168                 !ctrl_pressed)
 169                 clear_selection();
 170
 171         // Set the signal selection state if the item has been clicked
 172         if (mouse_down_item_) {
 173                 if (ctrl_pressed)
 174                         mouse_down_item_->select(!mouse_down_item_->selected());
 175                 else
 176                         mouse_down_item_->select(true);
 177         }
 178
 179         // Save the offsets of any signals which will be dragged
 180         bool item_dragged = false;
 181         const auto items = this->items();
 182         for (auto &i : items)
 183                 if (i->selected()) {
 184                         item_dragged = true;
 185                         i->drag();
 186                 }
 187
 188         // Do the background drag
 189         if (!item_dragged)
 190                 drag();
 191
 192         selection_changed();
 193 }
 194
 195 void ViewWidget::mouse_left_release_event(QMouseEvent *event)
 196 {
 197         assert(event);
 198
 199         auto items = this->items();
 200         const bool ctrl_pressed =
 201                 QApplication::keyboardModifiers() & Qt::ControlModifier;
 202
 203         // Unselect everything if control is not pressed
 204         const shared_ptr<ViewItem> mouse_over =
 205                 get_mouse_over_item(event->pos());
 206
 207         for (auto &i : items)
 208                 i->drag_release();
 209
 210         if (item_dragging_)
 211                 view_.restack_all_trace_tree_items();
 212         else {
 213                 if (!ctrl_pressed) {
 214                         for (shared_ptr<ViewItem> i : items)
 215                                 if (mouse_down_item_ != i)
 216                                         i->select(false);
 217
 218                         if (mouse_down_item_)
 219                                 item_clicked(mouse_down_item_);
 220                 }
 221         }
 222
 223         item_dragging_ = false;
 224 }
 225
 226 bool ViewWidget::touch_event(QTouchEvent *event)
 227 {
 228         (void)event;
 229
 230         return false;
 231 }
 232
 233 bool ViewWidget::event(QEvent *event)
 234 {
 235         switch (event->type()) {
 236         case QEvent::TouchBegin:
 237         case QEvent::TouchUpdate:
 238         case QEvent::TouchEnd:
 239                 if (touch_event(static_cast<QTouchEvent *>(event)))
 240                         return true;
 241                 break;
 242
 243         default:
 244                 break;
 245         }
 246
 247         return QWidget::event(event);
 248 }
 249
 250 void ViewWidget::mousePressEvent(QMouseEvent *event)
 251 {
 252         assert(event);
 253
 254         /* Ignore right click events as they will open context menus when
 255          * used on trace labels. Those menus prevent ViewWidget::mouseReleaseEvent()
 256          * to be triggered upon button release, making mouse_down_item_
 257          * hold the last reference to a view item that might have been deleted
 258          * from the context menu, preventing it from being freed as intended.
 259          */
 260         if (event->button() & Qt::LeftButton) {
 261                 mouse_down_point_ = event->pos();
 262                 mouse_down_item_ = get_mouse_over_item(event->pos());
 263                 mouse_left_press_event(event);
 264         }
 265 }
 266
 267 void ViewWidget::mouseReleaseEvent(QMouseEvent *event)
 268 {
 269         assert(event);
 270
 271         if (event->button() & Qt::LeftButton)
 272                 mouse_left_release_event(event);
 273
 274         mouse_down_point_ = QPoint(INT_MIN, INT_MIN);
 275         mouse_down_item_ = nullptr;
 276 }
 277
 278 void ViewWidget::mouseMoveEvent(QMouseEvent *event)
 279 {
 280         assert(event);
 281         mouse_point_ = event->pos();
 282
 283         if (!event->buttons())
 284                 item_hover(get_mouse_over_item(event->pos()));
 285         else if (event->buttons() & Qt::LeftButton) {
 286                 if (!item_dragging_) {
 287                         if ((event->pos() - mouse_down_point_).manhattanLength() <
 288                                 QApplication::startDragDistance())
 289                                 return;
 290
 291                         if (!accept_drag())
 292                                 return;
 293
 294                         item_dragging_ = true;
 295                 }
 296
 297                 // Do the drag
 298                 drag_items(event->pos() - mouse_down_point_);
 299         }
 300 }
 301
 302 void ViewWidget::leaveEvent(QEvent*)
 303 {
 304         mouse_point_ = QPoint(-1, -1);
 305         update();
 306 }
 307
 308 } // namespace trace
 309 } // namespace views
 310 } // namespace pv