pv/view/header.cpp

   1 /*
   2  * This file is part of the PulseView project.
   3  *
   4  * Copyright (C) 2012 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 "header.hpp"
  22 #include "view.hpp"
  23
  24 #include "signal.hpp"
  25 #include "tracegroup.hpp"
  26
  27 #include <cassert>
  28 #include <algorithm>
  29
  30 #include <boost/iterator/filter_iterator.hpp>
  31
  32 #include <QApplication>
  33 #include <QMenu>
  34 #include <QMouseEvent>
  35 #include <QPainter>
  36 #include <QRect>
  37
  38 #include <pv/session.hpp>
  39 #include <pv/widgets/popup.hpp>
  40
  41 using boost::make_filter_iterator;
  42 using std::dynamic_pointer_cast;
  43 using std::max;
  44 using std::make_pair;
  45 using std::min;
  46 using std::pair;
  47 using std::shared_ptr;
  48 using std::stable_sort;
  49 using std::vector;
  50
  51 namespace pv {
  52 namespace view {
  53
  54 const int Header::Padding = 12;
  55 const int Header::BaselineOffset = 5;
  56
  57 static bool item_selected(shared_ptr<RowItem> r)
  58 {
  59         return r->selected();
  60 }
  61
  62 Header::Header(View &parent) :
  63         MarginWidget(parent)
  64 {
  65         connect(&view_, SIGNAL(signals_moved()),
  66                 this, SLOT(on_signals_moved()));
  67 }
  68
  69 QSize Header::sizeHint() const
  70 {
  71         QRectF max_rect(-Padding, 0, Padding, 0);
  72         for (auto &i : view_)
  73                 if (i->enabled())
  74                         max_rect = max_rect.united(i->label_rect(QRect()));
  75         return QSize(max_rect.width() + Padding + BaselineOffset, 0);
  76 }
  77
  78 QSize Header::extended_size_hint() const
  79 {
  80         return sizeHint() + QSize(ViewItem::HighlightRadius, 0);
  81 }
  82
  83 vector< shared_ptr<ViewItem> > Header::items()
  84 {
  85         return vector< shared_ptr<ViewItem> >(view_.begin(), view_.end());
  86 }
  87
  88 shared_ptr<ViewItem> Header::get_mouse_over_item(const QPoint &pt)
  89 {
  90         const QRect r(0, 0, width() - BaselineOffset, height());
  91         for (auto &i : view_)
  92                 if (i->enabled() && i->label_rect(r).contains(pt))
  93                         return i;
  94         return shared_ptr<RowItem>();
  95 }
  96
  97 void Header::paintEvent(QPaintEvent*)
  98 {
  99         // The trace labels are not drawn with the arrows exactly on the
 100         // left edge of the widget, because then the selection shadow
 101         // would be clipped away.
 102         const QRect rect(0, 0, width() - BaselineOffset, height());
 103
 104         vector< shared_ptr<RowItem> > row_items(
 105                 view_.begin(), view_.end());
 106
 107         stable_sort(row_items.begin(), row_items.end(),
 108                 [](const shared_ptr<RowItem> &a, const shared_ptr<RowItem> &b) {
 109                         return a->visual_v_offset() < b->visual_v_offset(); });
 110
 111         QPainter painter(this);
 112         painter.setRenderHint(QPainter::Antialiasing);
 113
 114         for (const shared_ptr<RowItem> r : row_items)
 115         {
 116                 assert(r);
 117
 118                 const bool highlight = !dragging_ &&
 119                         r->label_rect(rect).contains(mouse_point_);
 120                 r->paint_label(painter, rect, highlight);
 121         }
 122
 123         painter.end();
 124 }
 125
 126 void Header::mouseLeftReleaseEvent(QMouseEvent *event)
 127 {
 128         assert(event);
 129
 130         const bool ctrl_pressed =
 131                 QApplication::keyboardModifiers() & Qt::ControlModifier;
 132
 133         // Unselect everything if control is not pressed
 134         const shared_ptr<ViewItem> mouse_over =
 135                 get_mouse_over_item(event->pos());
 136
 137         for (auto &r : view_)
 138                 r->drag_release();
 139
 140         if (dragging_)
 141                 view_.restack_all_row_items();
 142         else
 143         {
 144                 if (!ctrl_pressed) {
 145                         for (shared_ptr<RowItem> r : view_)
 146                                 if (mouse_down_item_ != r)
 147                                         r->select(false);
 148
 149                         if (mouse_down_item_)
 150                                 show_popup(mouse_down_item_);
 151                 }
 152         }
 153
 154         dragging_ = false;
 155 }
 156
 157 void Header::mouseReleaseEvent(QMouseEvent *event)
 158 {
 159         assert(event);
 160         if (event->button() & Qt::LeftButton)
 161                 mouseLeftReleaseEvent(event);
 162
 163         mouse_down_item_ = nullptr;
 164 }
 165
 166 void Header::mouseMoveEvent(QMouseEvent *event)
 167 {
 168         assert(event);
 169         mouse_point_ = event->pos();
 170
 171         if (!(event->buttons() & Qt::LeftButton))
 172                 return;
 173
 174         if ((event->pos() - mouse_down_point_).manhattanLength() <
 175                 QApplication::startDragDistance())
 176                 return;
 177
 178         // Check all the drag items share a common owner
 179         RowItemOwner *item_owner = nullptr;
 180         for (shared_ptr<RowItem> r : view_)
 181                 if (r->dragging()) {
 182                         if (!item_owner)
 183                                 item_owner = r->owner();
 184                         else if(item_owner != r->owner())
 185                                 return;
 186                 }
 187
 188         if (!item_owner)
 189                 return;
 190
 191         // Do the drag
 192         dragging_ = true;
 193
 194         const QPoint delta = event->pos() - mouse_down_point_;
 195
 196         for (std::shared_ptr<RowItem> r : view_)
 197                 if (r->dragging()) {
 198                         r->drag_by(delta);
 199
 200                         // Ensure the trace is selected
 201                         r->select();
 202                 }
 203
 204         item_owner->restack_items();
 205         for (const auto &r : *item_owner)
 206                 r->animate_to_layout_v_offset();
 207         signals_moved();
 208
 209         update();
 210 }
 211
 212 void Header::contextMenuEvent(QContextMenuEvent *event)
 213 {
 214         const shared_ptr<ViewItem> r = get_mouse_over_item(mouse_point_);
 215         if (!r)
 216                 return;
 217
 218         QMenu *menu = r->create_context_menu(this);
 219         if (!menu)
 220                 menu = new QMenu(this);
 221
 222         if (std::count_if(view_.begin(), view_.end(), item_selected) > 1)
 223         {
 224                 menu->addSeparator();
 225
 226                 QAction *const group = new QAction(tr("Group"), this);
 227                 QList<QKeySequence> shortcuts;
 228                 shortcuts.append(QKeySequence(Qt::ControlModifier | Qt::Key_G));
 229                 group->setShortcuts(shortcuts);
 230                 connect(group, SIGNAL(triggered()), this, SLOT(on_group()));
 231                 menu->addAction(group);
 232         }
 233
 234         menu->exec(event->globalPos());
 235 }
 236
 237 void Header::keyPressEvent(QKeyEvent *e)
 238 {
 239         assert(e);
 240
 241         if (e->key() == Qt::Key_Delete)
 242         {
 243                 for (const shared_ptr<RowItem> r : view_)
 244                         if (r->selected())
 245                                 r->delete_pressed();
 246         }
 247         else if (e->key() == Qt::Key_G && e->modifiers() == Qt::ControlModifier)
 248                 on_group();
 249         else if (e->key() == Qt::Key_U && e->modifiers() == Qt::ControlModifier)
 250                 on_ungroup();
 251 }
 252
 253 void Header::on_signals_moved()
 254 {
 255         update();
 256 }
 257
 258 void Header::on_group()
 259 {
 260         vector< shared_ptr<RowItem> > selected_items(
 261                 make_filter_iterator(item_selected, view_.begin(), view_.end()),
 262                 make_filter_iterator(item_selected, view_.end(), view_.end()));
 263         stable_sort(selected_items.begin(), selected_items.end(),
 264                 [](const shared_ptr<RowItem> &a, const shared_ptr<RowItem> &b) {
 265                         return a->visual_v_offset() < b->visual_v_offset(); });
 266
 267         shared_ptr<TraceGroup> group(new TraceGroup());
 268         shared_ptr<RowItem> mouse_down_item(
 269                 std::dynamic_pointer_cast<RowItem>(mouse_down_item_));
 270         shared_ptr<RowItem> focus_item(
 271                 mouse_down_item ? mouse_down_item : selected_items.front());
 272
 273         assert(focus_item);
 274         assert(focus_item->owner());
 275         focus_item->owner()->add_child_item(group);
 276
 277         // Set the group v_offset here before reparenting
 278         group->force_to_v_offset(focus_item->layout_v_offset() +
 279                 focus_item->v_extents().first);
 280
 281         for (size_t i = 0; i < selected_items.size(); i++) {
 282                 const shared_ptr<RowItem> &r = selected_items[i];
 283                 assert(r->owner());
 284                 r->owner()->remove_child_item(r);
 285                 group->add_child_item(r);
 286
 287                 // Put the items at 1-pixel offsets, so that restack will
 288                 // stack them in the right order
 289                 r->set_layout_v_offset(i);
 290         }
 291 }
 292
 293 void Header::on_ungroup()
 294 {
 295         bool restart;
 296         do {
 297                 restart = false;
 298                 for (const shared_ptr<RowItem> r : view_) {
 299                         const shared_ptr<TraceGroup> tg =
 300                                 dynamic_pointer_cast<TraceGroup>(r);
 301                         if (tg && tg->selected()) {
 302                                 tg->ungroup();
 303                                 restart = true;
 304                                 break;
 305                         }
 306                 }
 307         } while(restart);
 308 }
 309
 310 } // namespace view
 311 } // namespace pv