pv/view/ruler.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 <extdef.h>
  22
  23 #include <QApplication>
  24 #include <QFontMetrics>
  25 #include <QMouseEvent>
  26
  27 #include "ruler.hpp"
  28 #include "view.hpp"
  29
  30 #include <pv/util.hpp>
  31 #include <pv/widgets/popup.hpp>
  32
  33 using namespace Qt;
  34
  35 using std::shared_ptr;
  36 using std::vector;
  37
  38 namespace pv {
  39 namespace view {
  40
  41 const int Ruler::RulerHeight = 30;
  42 const int Ruler::MinorTickSubdivision = 4;
  43
  44 const int Ruler::HoverArrowSize = 5;
  45
  46 const int Ruler::Padding = 20;
  47 const int Ruler::BaselineOffset = 5;
  48
  49 Ruler::Ruler(View &parent) :
  50         MarginWidget(parent)
  51 {
  52         setMouseTracking(true);
  53
  54         connect(&view_, SIGNAL(hover_point_changed()),
  55                 this, SLOT(hover_point_changed()));
  56 }
  57
  58 void Ruler::clear_selection()
  59 {
  60         const vector< shared_ptr<TimeItem> > items(view_.time_items());
  61         for (auto &i : items)
  62                 i->select(false);
  63         update();
  64 }
  65
  66 QSize Ruler::sizeHint() const
  67 {
  68         return QSize(0, RulerHeight);
  69 }
  70
  71 QSize Ruler::extended_size_hint() const
  72 {
  73         const int text_height = calculate_text_height();
  74         return QSize(0, RulerHeight +
  75                 (text_height + Padding + BaselineOffset) / 2);
  76 }
  77
  78 void Ruler::paintEvent(QPaintEvent*)
  79 {
  80         const int ValueMargin = 3;
  81
  82         QPainter p(this);
  83         p.setRenderHint(QPainter::Antialiasing);
  84
  85         const double tick_period = view_.tick_period();
  86         const unsigned int prefix = view_.tick_prefix();
  87
  88         // Draw the tick marks
  89         p.setPen(palette().color(foregroundRole()));
  90
  91         const double minor_tick_period = tick_period / MinorTickSubdivision;
  92         const double first_major_division =
  93                 floor(view_.offset() / tick_period);
  94         const double first_minor_division =
  95                 ceil(view_.offset() / minor_tick_period);
  96         const double t0 = first_major_division * tick_period;
  97
  98         int division = (int)round(first_minor_division -
  99                 first_major_division * MinorTickSubdivision) - 1;
 100
 101         const int text_height = calculate_text_height();
 102         const int major_tick_y1 = text_height + ValueMargin * 2;
 103         const int tick_y2 = RulerHeight;
 104         const int minor_tick_y1 = (major_tick_y1 + tick_y2) / 2;
 105
 106         double x;
 107
 108         do {
 109                 const double t = t0 + division * minor_tick_period;
 110                 x = (t - view_.offset()) / view_.scale();
 111
 112                 if (division % MinorTickSubdivision == 0)
 113                 {
 114                         // Draw a major tick
 115                         p.drawText(x, ValueMargin, 0, text_height,
 116                                 AlignCenter | AlignTop | TextDontClip,
 117                                 pv::util::format_time(t, prefix));
 118                         p.drawLine(QPointF(x, major_tick_y1),
 119                                 QPointF(x, tick_y2));
 120                 }
 121                 else
 122                 {
 123                         // Draw a minor tick
 124                         p.drawLine(QPointF(x, minor_tick_y1),
 125                                 QPointF(x, tick_y2));
 126                 }
 127
 128                 division++;
 129
 130         } while (x < width());
 131
 132         // Draw the hover mark
 133         draw_hover_mark(p);
 134
 135         // The cursor labels are not drawn with the arrows exactly on the
 136         // bottom line of the widget, because then the selection shadow
 137         // would be clipped away.
 138         const QRect r = rect().adjusted(0, 0, 0, -BaselineOffset);
 139
 140         // Draw the items
 141         const vector< shared_ptr<TimeItem> > items(view_.time_items());
 142         for (auto &i : items) {
 143                 const bool highlight = !dragging_ &&
 144                         i->label_rect(r).contains(mouse_point_);
 145                 i->paint_label(p, r, highlight);
 146         }
 147 }
 148
 149 void Ruler::mouseMoveEvent(QMouseEvent *e)
 150 {
 151         mouse_point_ = e->pos();
 152
 153         if (!(e->buttons() & Qt::LeftButton))
 154                 return;
 155
 156         if ((e->pos() - mouse_down_point_).manhattanLength() <
 157                 QApplication::startDragDistance())
 158                 return;
 159
 160         // Do the drag
 161         dragging_ = true;
 162
 163         const int delta = e->pos().x() - mouse_down_point_.x();
 164         const vector< shared_ptr<TimeItem> > items(view_.time_items());
 165         for (auto &i : items)
 166                 if (i->dragging())
 167                         i->set_time(view_.offset() +
 168                                 (i->drag_point().x() + delta - 0.5) *
 169                                 view_.scale());
 170 }
 171
 172 void Ruler::mousePressEvent(QMouseEvent *e)
 173 {
 174         if (e->buttons() & Qt::LeftButton) {
 175                 mouse_down_point_ = e->pos();
 176
 177                 mouse_down_item_.reset();
 178
 179                 clear_selection();
 180
 181                 const vector< shared_ptr<TimeItem> > items(view_.time_items());
 182                 for (auto i = items.rbegin(); i != items.rend(); i++)
 183                         if ((*i)->label_rect(rect()).contains(e->pos())) {
 184                                 mouse_down_item_ = (*i);
 185                                 break;
 186                         }
 187
 188                 if (mouse_down_item_) {
 189                         mouse_down_item_->select();
 190                         mouse_down_item_->drag();
 191                 }
 192
 193                 selection_changed();
 194         }
 195 }
 196
 197 void Ruler::mouseReleaseEvent(QMouseEvent *)
 198 {
 199         using pv::widgets::Popup;
 200
 201         if (!dragging_ && mouse_down_item_) {
 202                 Popup *const p = mouse_down_item_->create_popup(&view_);
 203                 if (p) {
 204                         const QPoint arrpos(mouse_down_item_->get_x(),
 205                                 height() - BaselineOffset);
 206                         p->set_position(mapToGlobal(arrpos), Popup::Bottom);
 207                         p->show();
 208                 }
 209         }
 210
 211         dragging_ = false;
 212         mouse_down_item_.reset();
 213
 214         const vector< shared_ptr<TimeItem> > items(view_.time_items());
 215         for (auto &i : items)
 216                 i->drag_release();
 217 }
 218
 219 void Ruler::leaveEvent(QEvent*)
 220 {
 221         mouse_point_ = QPoint(-1, -1);
 222         update();
 223 }
 224
 225 void Ruler::mouseDoubleClickEvent(QMouseEvent *e)
 226 {
 227         view_.add_flag(view_.offset() + ((double)e->x() + 0.5) * view_.scale());
 228 }
 229
 230 void Ruler::keyPressEvent(QKeyEvent *e)
 231 {
 232         assert(e);
 233
 234         if (e->key() == Qt::Key_Delete)
 235         {
 236                 const vector< shared_ptr<TimeItem> > items(view_.time_items());
 237                 for (auto &i : items)
 238                         if (i->selected())
 239                                 i->delete_pressed();
 240         }
 241 }
 242
 243 void Ruler::draw_hover_mark(QPainter &p)
 244 {
 245         const int x = view_.hover_point().x();
 246
 247         if (x == -1)
 248                 return;
 249
 250         p.setPen(QPen(Qt::NoPen));
 251         p.setBrush(QBrush(palette().color(foregroundRole())));
 252
 253         const int b = RulerHeight;
 254         const QPointF points[] = {
 255                 QPointF(x, b),
 256                 QPointF(x - HoverArrowSize, b - HoverArrowSize),
 257                 QPointF(x + HoverArrowSize, b - HoverArrowSize)
 258         };
 259         p.drawPolygon(points, countof(points));
 260 }
 261
 262 int Ruler::calculate_text_height() const
 263 {
 264         return QFontMetrics(font()).ascent();
 265 }
 266
 267 void Ruler::hover_point_changed()
 268 {
 269         update();
 270 }
 271
 272 } // namespace view
 273 } // namespace pv