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         update();
  52 }
  53
  54 void ViewWidget::item_hover(const shared_ptr<ViewItem> &item)
  55 {
  56         (void)item;
  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
  68         const bool any_row_items_selected = any_of(view_.begin(), view_.end(),
  69                 [](const shared_ptr<TraceTreeItem> &r) { return r->selected(); });
  70
  71         const bool any_time_items_selected = any_of(items.begin(), items.end(),
  72                 [](const shared_ptr<TimeItem> &i) { return i->selected(); });
  73
  74         if (any_row_items_selected && !any_time_items_selected)
  75         {
  76                 // Check all the drag items share a common owner
  77                 TraceTreeItemOwner *item_owner = nullptr;
  78                 for (shared_ptr<TraceTreeItem> r : view_)
  79                         if (r->dragging()) {
  80                                 if (!item_owner)
  81                                         item_owner = r->owner();
  82                                 else if (item_owner != r->owner())
  83                                         return false;
  84                         }
  85
  86                 return true;
  87         }
  88         else if (any_time_items_selected && !any_row_items_selected)
  89         {
  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         TraceTreeItemOwner *item_owner = nullptr;
 109         for (std::shared_ptr<TraceTreeItem> r : view_)
 110                 if (r->dragging()) {
 111                         item_owner = r->owner();
 112                         r->drag_by(delta);
 113
 114                         // Ensure the trace is selected
 115                         r->select();
 116                 }
 117
 118         if (item_owner) {
 119                 item_dragged = true;
 120                 item_owner->restack_items();
 121                 for (const auto &r : *item_owner)
 122                         r->animate_to_layout_v_offset();
 123         }
 124
 125         // Drag the time items
 126         const vector< shared_ptr<TimeItem> > items(view_.time_items());
 127         for (auto &i : items)
 128                 if (i->dragging()) {
 129                         i->drag_by(delta);
 130                         item_dragged = true;
 131                 }
 132
 133         // Do the background drag
 134         if (!item_dragged)
 135                 drag_by(delta);
 136 }
 137
 138 void ViewWidget::drag()
 139 {
 140 }
 141
 142 void ViewWidget::drag_by(const QPoint &delta)
 143 {
 144         (void)delta;
 145 }
 146
 147 void ViewWidget::drag_release()
 148 {
 149 }
 150
 151 void ViewWidget::mouse_left_press_event(QMouseEvent *event)
 152 {
 153         (void)event;
 154
 155         const bool ctrl_pressed =
 156                 QApplication::keyboardModifiers() & Qt::ControlModifier;
 157
 158         // Clear selection if control is not pressed and this item is unselected
 159         if ((!mouse_down_item_ || !mouse_down_item_->selected()) &&
 160                 !ctrl_pressed)
 161                 clear_selection();
 162
 163         // Set the signal selection state if the item has been clicked
 164         if (mouse_down_item_) {
 165                 if (ctrl_pressed)
 166                         mouse_down_item_->select(!mouse_down_item_->selected());
 167                 else
 168                         mouse_down_item_->select(true);
 169         }
 170
 171         // Save the offsets of any signals which will be dragged
 172         bool item_dragged = false;
 173         const auto items = this->items();
 174         for (auto &i : items)
 175                 if (i->selected()) {
 176                         item_dragged = true;
 177                         i->drag();
 178                 }
 179
 180         // Do the background drag
 181         if (!item_dragged)
 182                 drag();
 183
 184         selection_changed();
 185         update();
 186 }
 187
 188 void ViewWidget::mouse_left_release_event(QMouseEvent *event)
 189 {
 190         assert(event);
 191
 192         auto items = this->items();
 193         const bool ctrl_pressed =
 194                 QApplication::keyboardModifiers() & Qt::ControlModifier;
 195
 196         // Unselect everything if control is not pressed
 197         const shared_ptr<ViewItem> mouse_over =
 198                 get_mouse_over_item(event->pos());
 199
 200         for (auto &i : items)
 201                 i->drag_release();
 202
 203         if (item_dragging_)
 204                 view_.restack_all_trace_tree_items();
 205         else
 206         {
 207                 if (!ctrl_pressed) {
 208                         for (shared_ptr<ViewItem> i : items)
 209                                 if (mouse_down_item_ != i)
 210                                         i->select(false);
 211
 212                         if (mouse_down_item_)
 213                                 item_clicked(mouse_down_item_);
 214                 }
 215         }
 216
 217         item_dragging_ = false;
 218 }
 219
 220 bool ViewWidget::touch_event(QTouchEvent *e)
 221 {
 222         (void)e;
 223         return false;
 224 }
 225
 226 bool ViewWidget::event(QEvent *event)
 227 {
 228         switch (event->type()) {
 229         case QEvent::TouchBegin:
 230         case QEvent::TouchUpdate:
 231         case QEvent::TouchEnd:
 232                 if (touch_event(static_cast<QTouchEvent *>(event)))
 233                         return true;
 234                 break;
 235
 236         default:
 237                 break;
 238         }
 239
 240         return QWidget::event(event);
 241 }
 242
 243 void ViewWidget::mousePressEvent(QMouseEvent *event)
 244 {
 245         assert(event);
 246
 247         mouse_down_point_ = event->pos();
 248         mouse_down_item_ = get_mouse_over_item(event->pos());
 249
 250         if (event->button() & Qt::LeftButton)
 251                 mouse_left_press_event(event);
 252 }
 253
 254 void ViewWidget::mouseReleaseEvent(QMouseEvent *event)
 255 {
 256         assert(event);
 257         if (event->button() & Qt::LeftButton)
 258                 mouse_left_release_event(event);
 259
 260         mouse_down_point_ = QPoint(INT_MIN, INT_MIN);
 261         mouse_down_item_ = nullptr;
 262 }
 263
 264 void ViewWidget::mouseMoveEvent(QMouseEvent *e)
 265 {
 266         assert(e);
 267         mouse_point_ = e->pos();
 268
 269         if (!e->buttons())
 270                 item_hover(get_mouse_over_item(e->pos()));
 271         else if (e->buttons() & Qt::LeftButton)
 272         {
 273                 if (!item_dragging_)
 274                 {
 275                         if ((e->pos() - mouse_down_point_).manhattanLength() <
 276                                 QApplication::startDragDistance())
 277                                 return;
 278
 279                         if (!accept_drag())
 280                                 return;
 281
 282                         item_dragging_ = true;
 283                 }
 284
 285                 // Do the drag
 286                 drag_items(e->pos() - mouse_down_point_);
 287
 288                 update();
 289         }
 290 }
 291
 292 void ViewWidget::leaveEvent(QEvent*)
 293 {
 294         mouse_point_ = QPoint(-1, -1);
 295         update();
 296 }
 297
 298 } // namespace view
 299 } // namespace pv