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         text_height_(calculate_text_height())
  52 {
  53         setMouseTracking(true);
  54
  55         connect(&view_, SIGNAL(hover_point_changed()),
  56                 this, SLOT(hover_point_changed()));
  57 }
  58
  59 void Ruler::clear_selection()
  60 {
  61         const vector< shared_ptr<TimeItem> > items(view_.time_items());
  62         for (auto &i : items)
  63                 i->select(false);
  64         update();
  65 }
  66
  67 QSize Ruler::sizeHint() const
  68 {
  69         return QSize(0, RulerHeight);
  70 }
  71
  72 QSize Ruler::extended_size_hint() const
  73 {
  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 major_tick_y1 = text_height_ + ValueMargin * 2;
 102         const int tick_y2 = RulerHeight;
 103         const int minor_tick_y1 = (major_tick_y1 + tick_y2) / 2;
 104
 105         double x;
 106
 107         do {
 108                 const double t = t0 + division * minor_tick_period;
 109                 x = (t - view_.offset()) / view_.scale();
 110
 111                 if (division % MinorTickSubdivision == 0)
 112                 {
 113                         // Draw a major tick
 114                         p.drawText(x, ValueMargin, 0, text_height_,
 115                                 AlignCenter | AlignTop | TextDontClip,
 116                                 pv::util::format_time(t, prefix));
 117                         p.drawLine(QPointF(x, major_tick_y1),
 118                                 QPointF(x, tick_y2));
 119                 }
 120                 else
 121                 {
 122                         // Draw a minor tick
 123                         p.drawLine(QPointF(x, minor_tick_y1),
 124                                 QPointF(x, tick_y2));
 125                 }
 126
 127                 division++;
 128
 129         } while (x < width());
 130
 131         // Draw the hover mark
 132         draw_hover_mark(p);
 133
 134         // The cursor labels are not drawn with the arrows exactly on the
 135         // bottom line of the widget, because then the selection shadow
 136         // would be clipped away.
 137         const QRect r = rect().adjusted(0, 0, 0, -BaselineOffset);
 138
 139         // Draw the items
 140         const vector< shared_ptr<TimeItem> > items(view_.time_items());
 141         for (auto &i : items) {
 142                 const bool highlight = !dragging_ &&
 143                         i->label_rect(r).contains(mouse_point_);
 144                 i->paint_label(p, r, highlight);
 145         }
 146 }
 147
 148 void Ruler::mouseMoveEvent(QMouseEvent *e)
 149 {
 150         mouse_point_ = e->pos();
 151
 152         if (!(e->buttons() & Qt::LeftButton))
 153                 return;
 154
 155         if ((e->pos() - mouse_down_point_).manhattanLength() <
 156                 QApplication::startDragDistance())
 157                 return;
 158
 159         // Do the drag
 160         dragging_ = true;
 161
 162         const int delta = e->pos().x() - mouse_down_point_.x();
 163         const vector< shared_ptr<TimeItem> > items(view_.time_items());
 164         for (auto &i : items)
 165                 if (i->dragging())
 166                         i->set_time(view_.offset() +
 167                                 (i->drag_point().x() + delta - 0.5) *
 168                                 view_.scale());
 169 }
 170
 171 void Ruler::mousePressEvent(QMouseEvent *e)
 172 {
 173         if (e->buttons() & Qt::LeftButton) {
 174                 mouse_down_point_ = e->pos();
 175
 176                 mouse_down_item_.reset();
 177
 178                 clear_selection();
 179
 180                 const vector< shared_ptr<TimeItem> > items(view_.time_items());
 181                 for (auto i = items.rbegin(); i != items.rend(); i++)
 182                         if ((*i)->label_rect(rect()).contains(e->pos())) {
 183                                 mouse_down_item_ = (*i);
 184                                 break;
 185                         }
 186
 187                 if (mouse_down_item_) {
 188                         mouse_down_item_->select();
 189                         mouse_down_item_->drag();
 190                 }
 191
 192                 selection_changed();
 193         }
 194 }
 195
 196 void Ruler::mouseReleaseEvent(QMouseEvent *)
 197 {
 198         using pv::widgets::Popup;
 199
 200         if (!dragging_ && mouse_down_item_) {
 201                 Popup *const p = mouse_down_item_->create_popup(&view_);
 202                 if (p) {
 203                         const QPoint arrpos(mouse_down_item_->get_x(),
 204                                 height() - BaselineOffset);
 205                         p->set_position(mapToGlobal(arrpos), Popup::Bottom);
 206                         p->show();
 207                 }
 208         }
 209
 210         dragging_ = false;
 211         mouse_down_item_.reset();
 212
 213         const vector< shared_ptr<TimeItem> > items(view_.time_items());
 214         for (auto &i : items)
 215                 i->drag_release();
 216 }
 217
 218 void Ruler::leaveEvent(QEvent*)
 219 {
 220         mouse_point_ = QPoint(-1, -1);
 221         update();
 222 }
 223
 224 void Ruler::mouseDoubleClickEvent(QMouseEvent *e)
 225 {
 226         view_.add_flag(view_.offset() + ((double)e->x() + 0.5) * view_.scale());
 227 }
 228
 229 void Ruler::keyPressEvent(QKeyEvent *e)
 230 {
 231         assert(e);
 232
 233         if (e->key() == Qt::Key_Delete)
 234         {
 235                 const vector< shared_ptr<TimeItem> > items(view_.time_items());
 236                 for (auto &i : items)
 237                         if (i->selected())
 238                                 i->delete_pressed();
 239         }
 240 }
 241
 242 void Ruler::draw_hover_mark(QPainter &p)
 243 {
 244         const int x = view_.hover_point().x();
 245
 246         if (x == -1)
 247                 return;
 248
 249         p.setPen(QPen(Qt::NoPen));
 250         p.setBrush(QBrush(palette().color(foregroundRole())));
 251
 252         const int b = RulerHeight;
 253         const QPointF points[] = {
 254                 QPointF(x, b),
 255                 QPointF(x - HoverArrowSize, b - HoverArrowSize),
 256                 QPointF(x + HoverArrowSize, b - HoverArrowSize)
 257         };
 258         p.drawPolygon(points, countof(points));
 259 }
 260
 261 int Ruler::calculate_text_height()
 262 {
 263         QFontMetrics fm(font());
 264         return fm.boundingRect(0, 0, INT_MAX, INT_MAX,
 265                 Qt::AlignLeft | Qt::AlignTop, "8").height();
 266 }
 267
 268 void Ruler::hover_point_changed()
 269 {
 270         update();
 271 }
 272
 273 } // namespace view
 274 } // namespace pv