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