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         const vector< shared_ptr<RowItem> > row_items(
 111                 view_.list_by_type<RowItem>());
 112         for (shared_ptr<RowItem> r : row_items)
 113                 if (r->dragging()) {
 114                         r->drag_by(delta);
 115
 116                         // Ensure the trace is selected
 117                         r->select();
 118
 119                         item_dragged = true;
 120                 }
 121
 122         // If an item is being dragged, update the stacking
 123         TraceTreeItemOwner *item_owner = nullptr;
 124         const vector< shared_ptr<TraceTreeItem> > trace_tree_items(
 125                 view_.list_by_type<TraceTreeItem>());
 126         for (shared_ptr<TraceTreeItem> i : trace_tree_items)
 127                 if (i->dragging())
 128                         item_owner = i->owner();
 129
 130         if (item_owner) {
 131                 item_owner->restack_items();
 132                 for (shared_ptr<TraceTreeItem> i : trace_tree_items)
 133                         i->animate_to_layout_v_offset();
 134         }
 135
 136         // Drag the time items
 137         const vector< shared_ptr<TimeItem> > items(view_.time_items());
 138         for (auto &i : items)
 139                 if (i->dragging()) {
 140                         i->drag_by(delta);
 141                         item_dragged = true;
 142                 }
 143
 144         // Do the background drag
 145         if (!item_dragged)
 146                 drag_by(delta);
 147 }
 148
 149 void ViewWidget::drag()
 150 {
 151 }
 152
 153 void ViewWidget::drag_by(const QPoint &delta)
 154 {
 155         (void)delta;
 156 }
 157
 158 void ViewWidget::drag_release()
 159 {
 160 }
 161
 162 void ViewWidget::mouse_left_press_event(QMouseEvent *event)
 163 {
 164         (void)event;
 165
 166         const bool ctrl_pressed =
 167                 QApplication::keyboardModifiers() & Qt::ControlModifier;
 168
 169         // Clear selection if control is not pressed and this item is unselected
 170         if ((!mouse_down_item_ || !mouse_down_item_->selected()) &&
 171                 !ctrl_pressed)
 172                 clear_selection();
 173
 174         // Set the signal selection state if the item has been clicked
 175         if (mouse_down_item_) {
 176                 if (ctrl_pressed)
 177                         mouse_down_item_->select(!mouse_down_item_->selected());
 178                 else
 179                         mouse_down_item_->select(true);
 180         }
 181
 182         // Save the offsets of any signals which will be dragged
 183         bool item_dragged = false;
 184         const auto items = this->items();
 185         for (auto &i : items)
 186                 if (i->selected()) {
 187                         item_dragged = true;
 188                         i->drag();
 189                 }
 190
 191         // Do the background drag
 192         if (!item_dragged)
 193                 drag();
 194
 195         selection_changed();
 196 }
 197
 198 void ViewWidget::mouse_left_release_event(QMouseEvent *event)
 199 {
 200         assert(event);
 201
 202         auto items = this->items();
 203         const bool ctrl_pressed =
 204                 QApplication::keyboardModifiers() & Qt::ControlModifier;
 205
 206         // Unselect everything if control is not pressed
 207         const shared_ptr<ViewItem> mouse_over =
 208                 get_mouse_over_item(event->pos());
 209
 210         for (auto &i : items)
 211                 i->drag_release();
 212
 213         if (item_dragging_)
 214                 view_.restack_all_trace_tree_items();
 215         else
 216         {
 217                 if (!ctrl_pressed) {
 218                         for (shared_ptr<ViewItem> i : items)
 219                                 if (mouse_down_item_ != i)
 220                                         i->select(false);
 221
 222                         if (mouse_down_item_)
 223                                 item_clicked(mouse_down_item_);
 224                 }
 225         }
 226
 227         item_dragging_ = false;
 228 }
 229
 230 bool ViewWidget::touch_event(QTouchEvent *e)
 231 {
 232         (void)e;
 233         return false;
 234 }
 235
 236 bool ViewWidget::event(QEvent *event)
 237 {
 238         switch (event->type()) {
 239         case QEvent::TouchBegin:
 240         case QEvent::TouchUpdate:
 241         case QEvent::TouchEnd:
 242                 if (touch_event(static_cast<QTouchEvent *>(event)))
 243                         return true;
 244                 break;
 245
 246         default:
 247                 break;
 248         }
 249
 250         return QWidget::event(event);
 251 }
 252
 253 void ViewWidget::mousePressEvent(QMouseEvent *event)
 254 {
 255         assert(event);
 256
 257         mouse_down_point_ = event->pos();
 258         mouse_down_item_ = get_mouse_over_item(event->pos());
 259
 260         if (event->button() & Qt::LeftButton)
 261                 mouse_left_press_event(event);
 262 }
 263
 264 void ViewWidget::mouseReleaseEvent(QMouseEvent *event)
 265 {
 266         assert(event);
 267         if (event->button() & Qt::LeftButton)
 268                 mouse_left_release_event(event);
 269
 270         mouse_down_point_ = QPoint(INT_MIN, INT_MIN);
 271         mouse_down_item_ = nullptr;
 272 }
 273
 274 void ViewWidget::mouseMoveEvent(QMouseEvent *e)
 275 {
 276         assert(e);
 277         mouse_point_ = e->pos();
 278
 279         if (!e->buttons())
 280                 item_hover(get_mouse_over_item(e->pos()));
 281         else if (e->buttons() & Qt::LeftButton)
 282         {
 283                 if (!item_dragging_)
 284                 {
 285                         if ((e->pos() - mouse_down_point_).manhattanLength() <
 286                                 QApplication::startDragDistance())
 287                                 return;
 288
 289                         if (!accept_drag())
 290                                 return;
 291
 292                         item_dragging_ = true;
 293                 }
 294
 295                 // Do the drag
 296                 drag_items(e->pos() - mouse_down_point_);
 297         }
 298 }
 299
 300 void ViewWidget::leaveEvent(QEvent*)
 301 {
 302         mouse_point_ = QPoint(-1, -1);
 303         update();
 304 }
 305
 306 } // namespace view
 307 } // namespace pv