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         return false;
  89 }
  90
  91 bool ViewWidget::mouse_down() const
  92 {
  93         return mouse_down_point_.x() != INT_MIN &&
  94                 mouse_down_point_.y() != INT_MIN;
  95 }
  96
  97 void ViewWidget::drag_items(const QPoint &delta)
  98 {
  99         // Drag the row items
 100         RowItemOwner *item_owner = nullptr;
 101         for (std::shared_ptr<RowItem> r : view_)
 102                 if (r->dragging()) {
 103                         item_owner = r->owner();
 104                         r->drag_by(delta);
 105
 106                         // Ensure the trace is selected
 107                         r->select();
 108                 }
 109
 110         if (item_owner) {
 111                 item_owner->restack_items();
 112                 for (const auto &r : *item_owner)
 113                         r->animate_to_layout_v_offset();
 114         }
 115
 116         // Drag the time items
 117         const vector< shared_ptr<TimeItem> > items(view_.time_items());
 118         for (auto &i : items)
 119                 if (i->dragging())
 120                         i->drag_by(delta);
 121 }
 122
 123 void ViewWidget::mouse_left_press_event(QMouseEvent *event)
 124 {
 125         (void)event;
 126
 127         const bool ctrl_pressed =
 128                 QApplication::keyboardModifiers() & Qt::ControlModifier;
 129
 130         // Clear selection if control is not pressed and this item is unselected
 131         if ((!mouse_down_item_ || !mouse_down_item_->selected()) &&
 132                 !ctrl_pressed)
 133                 clear_selection();
 134
 135         // Set the signal selection state if the item has been clicked
 136         if (mouse_down_item_) {
 137                 if (ctrl_pressed)
 138                         mouse_down_item_->select(!mouse_down_item_->selected());
 139                 else
 140                         mouse_down_item_->select(true);
 141         }
 142
 143         // Save the offsets of any signals which will be dragged
 144         const auto items = this->items();
 145         for (auto &i : items)
 146                 if (i->selected())
 147                         i->drag();
 148
 149         selection_changed();
 150         update();
 151 }
 152
 153 void ViewWidget::mouse_left_release_event(QMouseEvent *event)
 154 {
 155         assert(event);
 156
 157         auto items = this->items();
 158         const bool ctrl_pressed =
 159                 QApplication::keyboardModifiers() & Qt::ControlModifier;
 160
 161         // Unselect everything if control is not pressed
 162         const shared_ptr<ViewItem> mouse_over =
 163                 get_mouse_over_item(event->pos());
 164
 165         for (auto &i : items)
 166                 i->drag_release();
 167
 168         if (item_dragging_)
 169                 view_.restack_all_row_items();
 170         else
 171         {
 172                 if (!ctrl_pressed) {
 173                         for (shared_ptr<ViewItem> i : items)
 174                                 if (mouse_down_item_ != i)
 175                                         i->select(false);
 176
 177                         if (mouse_down_item_)
 178                                 item_clicked(mouse_down_item_);
 179                 }
 180         }
 181
 182         item_dragging_ = false;
 183 }
 184
 185 bool ViewWidget::touch_event(QTouchEvent *e)
 186 {
 187         (void)e;
 188         return false;
 189 }
 190
 191 bool ViewWidget::event(QEvent *event)
 192 {
 193         switch (event->type()) {
 194         case QEvent::TouchBegin:
 195         case QEvent::TouchUpdate:
 196         case QEvent::TouchEnd:
 197                 if (touch_event(static_cast<QTouchEvent *>(event)))
 198                         return true;
 199                 break;
 200
 201         default:
 202                 break;
 203         }
 204
 205         return QWidget::event(event);
 206 }
 207
 208 void ViewWidget::mousePressEvent(QMouseEvent *event)
 209 {
 210         assert(event);
 211
 212         mouse_down_point_ = event->pos();
 213         mouse_down_item_ = get_mouse_over_item(event->pos());
 214
 215         if (event->button() & Qt::LeftButton)
 216                 mouse_left_press_event(event);
 217 }
 218
 219 void ViewWidget::mouseReleaseEvent(QMouseEvent *event)
 220 {
 221         assert(event);
 222         if (event->button() & Qt::LeftButton)
 223                 mouse_left_release_event(event);
 224
 225         mouse_down_point_ = QPoint(INT_MIN, INT_MIN);
 226         mouse_down_item_ = nullptr;
 227 }
 228
 229 void ViewWidget::mouseMoveEvent(QMouseEvent *event)
 230 {
 231         assert(event);
 232         mouse_point_ = event->pos();
 233
 234         if (!(event->buttons() & Qt::LeftButton))
 235                 return;
 236
 237         if ((event->pos() - mouse_down_point_).manhattanLength() <
 238                 QApplication::startDragDistance())
 239                 return;
 240
 241         if (!accept_drag())
 242                 return;
 243
 244         // Do the drag
 245         item_dragging_ = true;
 246         drag_items(event->pos() - mouse_down_point_);
 247
 248         update();
 249 }
 250
 251 void ViewWidget::leaveEvent(QEvent*)
 252 {
 253         mouse_point_ = QPoint(-1, -1);
 254         update();
 255 }
 256
 257 } // namespace view
 258 } // namespace pv