pv/view/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, write to the Free Software
  18  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301 USA
  19  */
  20
  21 #include <QApplication>
  22 #include <QMouseEvent>
  23 #include <QTouchEvent>
  24
  25 #include "tracetreeitem.hpp"
  26 #include "view.hpp"
  27 #include "viewwidget.hpp"
  28
  29 using std::any_of;
  30 using std::shared_ptr;
  31 using std::vector;
  32
  33 namespace pv {
  34 namespace view {
  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         {
  78                 // Check all the drag items share a common owner
  79                 TraceTreeItemOwner *item_owner = nullptr;
  80                 for (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         }
  90         else if (any_time_items_selected && !any_row_items_selected)
  91         {
  92                 return true;
  93         }
  94
  95         // A background drag is beginning
  96         return true;
  97 }
  98
  99 bool ViewWidget::mouse_down() const
 100 {
 101         return mouse_down_point_.x() != INT_MIN &&
 102                 mouse_down_point_.y() != INT_MIN;
 103 }
 104
 105 void ViewWidget::drag_items(const QPoint &delta)
 106 {
 107         bool item_dragged = false;
 108
 109         // Drag the row items
 110         TraceTreeItemOwner *item_owner = nullptr;
 111         const vector< shared_ptr<TraceTreeItem> > trace_tree_items(
 112                 view_.list_by_type<TraceTreeItem>());
 113         for (shared_ptr<TraceTreeItem> r : trace_tree_items)
 114                 if (r->dragging()) {
 115                         item_owner = r->owner();
 116                         r->drag_by(delta);
 117
 118                         // Ensure the trace is selected
 119                         r->select();
 120                 }
 121
 122         if (item_owner) {
 123                 item_dragged = true;
 124                 item_owner->restack_items();
 125                 for (shared_ptr<TraceTreeItem> r : trace_tree_items)
 126                         r->animate_to_layout_v_offset();
 127         }
 128
 129         // Drag the time items
 130         const vector< shared_ptr<TimeItem> > items(view_.time_items());
 131         for (auto &i : items)
 132                 if (i->dragging()) {
 133                         i->drag_by(delta);
 134                         item_dragged = true;
 135                 }
 136
 137         // Do the background drag
 138         if (!item_dragged)
 139                 drag_by(delta);
 140 }
 141
 142 void ViewWidget::drag()
 143 {
 144 }
 145
 146 void ViewWidget::drag_by(const QPoint &delta)
 147 {
 148         (void)delta;
 149 }
 150
 151 void ViewWidget::drag_release()
 152 {
 153 }
 154
 155 void ViewWidget::mouse_left_press_event(QMouseEvent *event)
 156 {
 157         (void)event;
 158
 159         const bool ctrl_pressed =
 160                 QApplication::keyboardModifiers() & Qt::ControlModifier;
 161
 162         // Clear selection if control is not pressed and this item is unselected
 163         if ((!mouse_down_item_ || !mouse_down_item_->selected()) &&
 164                 !ctrl_pressed)
 165                 clear_selection();
 166
 167         // Set the signal selection state if the item has been clicked
 168         if (mouse_down_item_) {
 169                 if (ctrl_pressed)
 170                         mouse_down_item_->select(!mouse_down_item_->selected());
 171                 else
 172                         mouse_down_item_->select(true);
 173         }
 174
 175         // Save the offsets of any signals which will be dragged
 176         bool item_dragged = false;
 177         const auto items = this->items();
 178         for (auto &i : items)
 179                 if (i->selected()) {
 180                         item_dragged = true;
 181                         i->drag();
 182                 }
 183
 184         // Do the background drag
 185         if (!item_dragged)
 186                 drag();
 187
 188         selection_changed();
 189 }
 190
 191 void ViewWidget::mouse_left_release_event(QMouseEvent *event)
 192 {
 193         assert(event);
 194
 195         auto items = this->items();
 196         const bool ctrl_pressed =
 197                 QApplication::keyboardModifiers() & Qt::ControlModifier;
 198
 199         // Unselect everything if control is not pressed
 200         const shared_ptr<ViewItem> mouse_over =
 201                 get_mouse_over_item(event->pos());
 202
 203         for (auto &i : items)
 204                 i->drag_release();
 205
 206         if (item_dragging_)
 207                 view_.restack_all_trace_tree_items();
 208         else
 209         {
 210                 if (!ctrl_pressed) {
 211                         for (shared_ptr<ViewItem> i : items)
 212                                 if (mouse_down_item_ != i)
 213                                         i->select(false);
 214
 215                         if (mouse_down_item_)
 216                                 item_clicked(mouse_down_item_);
 217                 }
 218         }
 219
 220         item_dragging_ = false;
 221 }
 222
 223 bool ViewWidget::touch_event(QTouchEvent *e)
 224 {
 225         (void)e;
 226         return false;
 227 }
 228
 229 bool ViewWidget::event(QEvent *event)
 230 {
 231         switch (event->type()) {
 232         case QEvent::TouchBegin:
 233         case QEvent::TouchUpdate:
 234         case QEvent::TouchEnd:
 235                 if (touch_event(static_cast<QTouchEvent *>(event)))
 236                         return true;
 237                 break;
 238
 239         default:
 240                 break;
 241         }
 242
 243         return QWidget::event(event);
 244 }
 245
 246 void ViewWidget::mousePressEvent(QMouseEvent *event)
 247 {
 248         assert(event);
 249
 250         mouse_down_point_ = event->pos();
 251         mouse_down_item_ = get_mouse_over_item(event->pos());
 252
 253         if (event->button() & Qt::LeftButton)
 254                 mouse_left_press_event(event);
 255 }
 256
 257 void ViewWidget::mouseReleaseEvent(QMouseEvent *event)
 258 {
 259         assert(event);
 260         if (event->button() & Qt::LeftButton)
 261                 mouse_left_release_event(event);
 262
 263         mouse_down_point_ = QPoint(INT_MIN, INT_MIN);
 264         mouse_down_item_ = nullptr;
 265 }
 266
 267 void ViewWidget::mouseMoveEvent(QMouseEvent *e)
 268 {
 269         assert(e);
 270         mouse_point_ = e->pos();
 271
 272         if (!e->buttons())
 273                 item_hover(get_mouse_over_item(e->pos()));
 274         else if (e->buttons() & Qt::LeftButton)
 275         {
 276                 if (!item_dragging_)
 277                 {
 278                         if ((e->pos() - mouse_down_point_).manhattanLength() <
 279                                 QApplication::startDragDistance())
 280                                 return;
 281
 282                         if (!accept_drag())
 283                                 return;
 284
 285                         item_dragging_ = true;
 286                 }
 287
 288                 // Do the drag
 289                 drag_items(e->pos() - mouse_down_point_);
 290
 291                 update();
 292         }
 293 }
 294
 295 void ViewWidget::leaveEvent(QEvent*)
 296 {
 297         mouse_point_ = QPoint(-1, -1);
 298         update();
 299 }
 300
 301 } // namespace view
 302 } // namespace pv