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
  24 #include "rowitem.hpp"
  25 #include "view.hpp"
  26 #include "viewwidget.hpp"
  27
  28 using std::any_of;
  29 using std::shared_ptr;
  30 using std::vector;
  31
  32 namespace pv {
  33 namespace view {
  34
  35 ViewWidget::ViewWidget(View &parent) :
  36         QWidget(&parent),
  37         view_(parent),
  38         item_dragging_(false)
  39 {
  40         setFocusPolicy(Qt::ClickFocus);
  41         setMouseTracking(true);
  42 }
  43
  44 void ViewWidget::clear_selection()
  45 {
  46         const auto items = this->items();
  47         for (auto &i : items)
  48                 i->select(false);
  49         update();
  50 }
  51
  52 void ViewWidget::item_clicked(const shared_ptr<ViewItem> &item)
  53 {
  54         (void)item;
  55 }
  56
  57 bool ViewWidget::accept_drag() const
  58 {
  59         const vector< shared_ptr<TimeItem> > items(view_.time_items());
  60
  61         const bool any_row_items_selected = any_of(view_.begin(), view_.end(),
  62                 [](const shared_ptr<RowItem> &r) { return r->selected(); });
  63
  64         const bool any_time_items_selected = any_of(items.begin(), items.end(),
  65                 [](const shared_ptr<TimeItem> &i) { return i->selected(); });
  66
  67         if (any_row_items_selected && !any_time_items_selected)
  68         {
  69                 // Check all the drag items share a common owner
  70                 RowItemOwner *item_owner = nullptr;
  71                 for (shared_ptr<RowItem> r : view_)
  72                         if (r->dragging()) {
  73                                 if (!item_owner)
  74                                         item_owner = r->owner();
  75                                 else if(item_owner != r->owner())
  76                                         return false;
  77                         }
  78
  79                 return true;
  80         }
  81         else if (any_time_items_selected && !any_row_items_selected)
  82         {
  83                 return true;
  84         }
  85
  86         return false;
  87 }
  88
  89 bool ViewWidget::mouse_down() const
  90 {
  91         return mouse_down_point_.x() != INT_MIN &&
  92                 mouse_down_point_.y() != INT_MIN;
  93 }
  94
  95 void ViewWidget::drag_items(const QPoint &delta)
  96 {
  97         // Drag the row items
  98         RowItemOwner *item_owner = nullptr;
  99         for (std::shared_ptr<RowItem> r : view_)
 100                 if (r->dragging()) {
 101                         item_owner = r->owner();
 102                         r->drag_by(delta);
 103
 104                         // Ensure the trace is selected
 105                         r->select();
 106                 }
 107
 108         if (item_owner) {
 109                 item_owner->restack_items();
 110                 for (const auto &r : *item_owner)
 111                         r->animate_to_layout_v_offset();
 112         }
 113
 114         // Drag the time items
 115         const vector< shared_ptr<TimeItem> > items(view_.time_items());
 116         for (auto &i : items)
 117                 if (i->dragging())
 118                         i->drag_by(delta);
 119 }
 120
 121 void ViewWidget::mouse_left_press_event(QMouseEvent *event)
 122 {
 123         (void)event;
 124
 125         const bool ctrl_pressed =
 126                 QApplication::keyboardModifiers() & Qt::ControlModifier;
 127
 128         // Clear selection if control is not pressed and this item is unselected
 129         if ((!mouse_down_item_ || !mouse_down_item_->selected()) &&
 130                 !ctrl_pressed)
 131                 clear_selection();
 132
 133         // Set the signal selection state if the item has been clicked
 134         if (mouse_down_item_) {
 135                 if (ctrl_pressed)
 136                         mouse_down_item_->select(!mouse_down_item_->selected());
 137                 else
 138                         mouse_down_item_->select(true);
 139         }
 140
 141         // Save the offsets of any signals which will be dragged
 142         const auto items = this->items();
 143         for (auto &i : items)
 144                 if (i->selected())
 145                         i->drag();
 146
 147         selection_changed();
 148         update();
 149 }
 150
 151 void ViewWidget::mouse_left_release_event(QMouseEvent *event)
 152 {
 153         assert(event);
 154
 155         auto items = this->items();
 156         const bool ctrl_pressed =
 157                 QApplication::keyboardModifiers() & Qt::ControlModifier;
 158
 159         // Unselect everything if control is not pressed
 160         const shared_ptr<ViewItem> mouse_over =
 161                 get_mouse_over_item(event->pos());
 162
 163         for (auto &i : items)
 164                 i->drag_release();
 165
 166         if (item_dragging_)
 167                 view_.restack_all_row_items();
 168         else
 169         {
 170                 if (!ctrl_pressed) {
 171                         for (shared_ptr<ViewItem> i : items)
 172                                 if (mouse_down_item_ != i)
 173                                         i->select(false);
 174
 175                         if (mouse_down_item_)
 176                                 item_clicked(mouse_down_item_);
 177                 }
 178         }
 179
 180         item_dragging_ = false;
 181 }
 182
 183 void ViewWidget::mousePressEvent(QMouseEvent *event)
 184 {
 185         assert(event);
 186
 187         mouse_down_point_ = event->pos();
 188         mouse_down_item_ = get_mouse_over_item(event->pos());
 189
 190         if (event->button() & Qt::LeftButton)
 191                 mouse_left_press_event(event);
 192 }
 193
 194 void ViewWidget::mouseReleaseEvent(QMouseEvent *event)
 195 {
 196         assert(event);
 197         if (event->button() & Qt::LeftButton)
 198                 mouse_left_release_event(event);
 199
 200         mouse_down_point_ = QPoint(INT_MIN, INT_MIN);
 201         mouse_down_item_ = nullptr;
 202 }
 203
 204 void ViewWidget::mouseMoveEvent(QMouseEvent *event)
 205 {
 206         assert(event);
 207         mouse_point_ = event->pos();
 208
 209         if (!(event->buttons() & Qt::LeftButton))
 210                 return;
 211
 212         if ((event->pos() - mouse_down_point_).manhattanLength() <
 213                 QApplication::startDragDistance())
 214                 return;
 215
 216         if (!accept_drag())
 217                 return;
 218
 219         // Do the drag
 220         item_dragging_ = true;
 221         drag_items(event->pos() - mouse_down_point_);
 222
 223         update();
 224 }
 225
 226 void ViewWidget::leaveEvent(QEvent*)
 227 {
 228         mouse_point_ = QPoint(-1, -1);
 229         update();
 230 }
 231
 232 } // namespace view
 233 } // namespace pv