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