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 "rowitem.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         update();
  52 }
  53
  54 void ViewWidget::item_clicked(const shared_ptr<ViewItem> &item)
  55 {
  56         (void)item;
  57 }
  58
  59 bool ViewWidget::accept_drag() const
  60 {
  61         const vector< shared_ptr<TimeItem> > items(view_.time_items());
  62
  63         const bool any_row_items_selected = any_of(view_.begin(), view_.end(),
  64                 [](const shared_ptr<RowItem> &r) { return r->selected(); });
  65
  66         const bool any_time_items_selected = any_of(items.begin(), items.end(),
  67                 [](const shared_ptr<TimeItem> &i) { return i->selected(); });
  68
  69         if (any_row_items_selected && !any_time_items_selected)
  70         {
  71                 // Check all the drag items share a common owner
  72                 RowItemOwner *item_owner = nullptr;
  73                 for (shared_ptr<RowItem> r : view_)
  74                         if (r->dragging()) {
  75                                 if (!item_owner)
  76                                         item_owner = r->owner();
  77                                 else if(item_owner != r->owner())
  78                                         return false;
  79                         }
  80
  81                 return true;
  82         }
  83         else if (any_time_items_selected && !any_row_items_selected)
  84         {
  85                 return true;
  86         }
  87
  88         // A background drag is beginning
  89         return true;
  90 }
  91
  92 bool ViewWidget::mouse_down() const
  93 {
  94         return mouse_down_point_.x() != INT_MIN &&
  95                 mouse_down_point_.y() != INT_MIN;
  96 }
  97
  98 void ViewWidget::drag_items(const QPoint &delta)
  99 {
 100         bool item_dragged = false;
 101
 102         // Drag the row items
 103         RowItemOwner *item_owner = nullptr;
 104         for (std::shared_ptr<RowItem> r : view_)
 105                 if (r->dragging()) {
 106                         item_owner = r->owner();
 107                         r->drag_by(delta);
 108
 109                         // Ensure the trace is selected
 110                         r->select();
 111                 }
 112
 113         if (item_owner) {
 114                 item_dragged = true;
 115                 item_owner->restack_items();
 116                 for (const auto &r : *item_owner)
 117                         r->animate_to_layout_v_offset();
 118         }
 119
 120         // Drag the time items
 121         const vector< shared_ptr<TimeItem> > items(view_.time_items());
 122         for (auto &i : items)
 123                 if (i->dragging()) {
 124                         i->drag_by(delta);
 125                         item_dragged = true;
 126                 }
 127
 128         // Do the background drag
 129         if (!item_dragged)
 130                 drag_by(delta);
 131 }
 132
 133 void ViewWidget::drag()
 134 {
 135 }
 136
 137 void ViewWidget::drag_by(const QPoint &delta)
 138 {
 139         (void)delta;
 140 }
 141
 142 void ViewWidget::drag_release()
 143 {
 144 }
 145
 146 void ViewWidget::mouse_left_press_event(QMouseEvent *event)
 147 {
 148         (void)event;
 149
 150         const bool ctrl_pressed =
 151                 QApplication::keyboardModifiers() & Qt::ControlModifier;
 152
 153         // Clear selection if control is not pressed and this item is unselected
 154         if ((!mouse_down_item_ || !mouse_down_item_->selected()) &&
 155                 !ctrl_pressed)
 156                 clear_selection();
 157
 158         // Set the signal selection state if the item has been clicked
 159         if (mouse_down_item_) {
 160                 if (ctrl_pressed)
 161                         mouse_down_item_->select(!mouse_down_item_->selected());
 162                 else
 163                         mouse_down_item_->select(true);
 164         }
 165
 166         // Save the offsets of any signals which will be dragged
 167         bool item_dragged = false;
 168         const auto items = this->items();
 169         for (auto &i : items)
 170                 if (i->selected()) {
 171                         item_dragged = true;
 172                         i->drag();
 173                 }
 174
 175         // Do the background drag
 176         if (!item_dragged)
 177                 drag();
 178
 179         selection_changed();
 180         update();
 181 }
 182
 183 void ViewWidget::mouse_left_release_event(QMouseEvent *event)
 184 {
 185         assert(event);
 186
 187         auto items = this->items();
 188         const bool ctrl_pressed =
 189                 QApplication::keyboardModifiers() & Qt::ControlModifier;
 190
 191         // Unselect everything if control is not pressed
 192         const shared_ptr<ViewItem> mouse_over =
 193                 get_mouse_over_item(event->pos());
 194
 195         for (auto &i : items)
 196                 i->drag_release();
 197
 198         if (item_dragging_)
 199                 view_.restack_all_row_items();
 200         else
 201         {
 202                 if (!ctrl_pressed) {
 203                         for (shared_ptr<ViewItem> i : items)
 204                                 if (mouse_down_item_ != i)
 205                                         i->select(false);
 206
 207                         if (mouse_down_item_)
 208                                 item_clicked(mouse_down_item_);
 209                 }
 210         }
 211
 212         item_dragging_ = false;
 213 }
 214
 215 bool ViewWidget::touch_event(QTouchEvent *e)
 216 {
 217         (void)e;
 218         return false;
 219 }
 220
 221 bool ViewWidget::event(QEvent *event)
 222 {
 223         switch (event->type()) {
 224         case QEvent::TouchBegin:
 225         case QEvent::TouchUpdate:
 226         case QEvent::TouchEnd:
 227                 if (touch_event(static_cast<QTouchEvent *>(event)))
 228                         return true;
 229                 break;
 230
 231         default:
 232                 break;
 233         }
 234
 235         return QWidget::event(event);
 236 }
 237
 238 void ViewWidget::mousePressEvent(QMouseEvent *event)
 239 {
 240         assert(event);
 241
 242         mouse_down_point_ = event->pos();
 243         mouse_down_item_ = get_mouse_over_item(event->pos());
 244
 245         if (event->button() & Qt::LeftButton)
 246                 mouse_left_press_event(event);
 247 }
 248
 249 void ViewWidget::mouseReleaseEvent(QMouseEvent *event)
 250 {
 251         assert(event);
 252         if (event->button() & Qt::LeftButton)
 253                 mouse_left_release_event(event);
 254
 255         mouse_down_point_ = QPoint(INT_MIN, INT_MIN);
 256         mouse_down_item_ = nullptr;
 257 }
 258
 259 void ViewWidget::mouseMoveEvent(QMouseEvent *event)
 260 {
 261         assert(event);
 262         mouse_point_ = event->pos();
 263
 264         if (!(event->buttons() & Qt::LeftButton))
 265                 return;
 266
 267         if (!item_dragging_)
 268         {
 269                 if ((event->pos() - mouse_down_point_).manhattanLength() <
 270                         QApplication::startDragDistance())
 271                         return;
 272
 273                 if (!accept_drag())
 274                         return;
 275
 276                 item_dragging_ = true;
 277         }
 278
 279         // Do the drag
 280         drag_items(event->pos() - mouse_down_point_);
 281
 282         update();
 283 }
 284
 285 void ViewWidget::leaveEvent(QEvent*)
 286 {
 287         mouse_point_ = QPoint(-1, -1);
 288         update();
 289 }
 290
 291 } // namespace view
 292 } // namespace pv