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 <QMenu>
  26 #include <QMouseEvent>
  27
  28 #include "ruler.hpp"
  29 #include "view.hpp"
  30
  31 #include <pv/util.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 float Ruler::RulerHeight = 2.5f;  // x Text Height
  42 const int Ruler::MinorTickSubdivision = 4;
  43
  44 const float Ruler::HoverArrowSize = 0.5f;  // x Text Height
  45
  46 Ruler::Ruler(View &parent) :
  47         MarginWidget(parent)
  48 {
  49         setMouseTracking(true);
  50
  51         connect(&view_, SIGNAL(hover_point_changed()),
  52                 this, SLOT(hover_point_changed()));
  53 }
  54
  55 void Ruler::clear_selection()
  56 {
  57         const vector< shared_ptr<TimeItem> > items(view_.time_items());
  58         for (auto &i : items)
  59                 i->select(false);
  60         update();
  61 }
  62
  63 QSize Ruler::sizeHint() const
  64 {
  65         const int text_height = calculate_text_height();
  66         return QSize(0, RulerHeight * text_height);
  67 }
  68
  69 QSize Ruler::extended_size_hint() const
  70 {
  71         QRectF max_rect;
  72         std::vector< std::shared_ptr<TimeItem> > items(view_.time_items());
  73         for (auto &i : items)
  74                 max_rect = max_rect.united(i->label_rect(QRect()));
  75         return QSize(0, sizeHint().height() - max_rect.top() / 2 +
  76                 ViewItem::HighlightRadius);
  77 }
  78
  79 shared_ptr<TimeItem> Ruler::get_mouse_over_item(const QPoint &pt)
  80 {
  81         const vector< shared_ptr<TimeItem> > items(view_.time_items());
  82         for (auto i = items.rbegin(); i != items.rend(); i++)
  83                 if ((*i)->enabled() && (*i)->label_rect(rect()).contains(pt))
  84                         return *i;
  85         return nullptr;
  86 }
  87
  88 void Ruler::paintEvent(QPaintEvent*)
  89 {
  90         const int ValueMargin = 3;
  91
  92         QPainter p(this);
  93         p.setRenderHint(QPainter::Antialiasing);
  94
  95         const double tick_period = view_.tick_period();
  96         const unsigned int prefix = view_.tick_prefix();
  97
  98         // Draw the tick marks
  99         p.setPen(palette().color(foregroundRole()));
 100
 101         const double minor_tick_period = tick_period / MinorTickSubdivision;
 102         const double first_major_division =
 103                 floor(view_.offset() / tick_period);
 104         const double first_minor_division =
 105                 ceil(view_.offset() / minor_tick_period);
 106         const double t0 = first_major_division * tick_period;
 107
 108         int division = (int)round(first_minor_division -
 109                 first_major_division * MinorTickSubdivision) - 1;
 110
 111         const int text_height = calculate_text_height();
 112         const int ruler_height = RulerHeight * text_height;
 113         const int major_tick_y1 = text_height + ValueMargin * 2;
 114         const int minor_tick_y1 = (major_tick_y1 + ruler_height) / 2;
 115
 116         double x;
 117
 118         do {
 119                 const double t = t0 + division * minor_tick_period;
 120                 x = (t - view_.offset()) / view_.scale();
 121
 122                 if (division % MinorTickSubdivision == 0)
 123                 {
 124                         // Draw a major tick
 125                         p.drawText(x, ValueMargin, 0, text_height,
 126                                 AlignCenter | AlignTop | TextDontClip,
 127                                 pv::util::format_time(t, prefix));
 128                         p.drawLine(QPointF(x, major_tick_y1),
 129                                 QPointF(x, ruler_height));
 130                 }
 131                 else
 132                 {
 133                         // Draw a minor tick
 134                         p.drawLine(QPointF(x, minor_tick_y1),
 135                                 QPointF(x, ruler_height));
 136                 }
 137
 138                 division++;
 139
 140         } while (x < width());
 141
 142         // Draw the hover mark
 143         draw_hover_mark(p, text_height);
 144
 145         // The cursor labels are not drawn with the arrows exactly on the
 146         // bottom line of the widget, because then the selection shadow
 147         // would be clipped away.
 148         const QRect r = rect().adjusted(0, 0, 0, -ViewItem::HighlightRadius);
 149
 150         // Draw the items
 151         const vector< shared_ptr<TimeItem> > items(view_.time_items());
 152         for (auto &i : items) {
 153                 const bool highlight = !dragging_ &&
 154                         i->label_rect(r).contains(mouse_point_);
 155                 i->paint_label(p, r, highlight);
 156         }
 157 }
 158
 159 void Ruler::mouseMoveEvent(QMouseEvent *e)
 160 {
 161         mouse_point_ = e->pos();
 162
 163         if (!(e->buttons() & Qt::LeftButton))
 164                 return;
 165
 166         if ((e->pos() - mouse_down_point_).manhattanLength() <
 167                 QApplication::startDragDistance())
 168                 return;
 169
 170         // Do the drag
 171         dragging_ = true;
 172
 173         const QPoint delta = e->pos() - mouse_down_point_;
 174         const vector< shared_ptr<TimeItem> > items(view_.time_items());
 175         for (auto &i : items)
 176                 if (i->dragging())
 177                         i->drag_by(delta);
 178 }
 179
 180 void Ruler::mousePressEvent(QMouseEvent *e)
 181 {
 182         if (e->buttons() & Qt::LeftButton) {
 183                 mouse_down_point_ = e->pos();
 184                 mouse_down_item_ = get_mouse_over_item(e->pos());
 185
 186                 clear_selection();
 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                 show_popup(mouse_down_item_);
 203
 204         dragging_ = false;
 205         mouse_down_item_.reset();
 206
 207         const vector< shared_ptr<TimeItem> > items(view_.time_items());
 208         for (auto &i : items)
 209                 i->drag_release();
 210 }
 211
 212 void Ruler::leaveEvent(QEvent*)
 213 {
 214         mouse_point_ = QPoint(-1, -1);
 215         update();
 216 }
 217
 218 void Ruler::mouseDoubleClickEvent(QMouseEvent *e)
 219 {
 220         view_.add_flag(view_.offset() + ((double)e->x() + 0.5) * view_.scale());
 221 }
 222
 223 void Ruler::contextMenuEvent(QContextMenuEvent *event)
 224 {
 225         const shared_ptr<TimeItem> r = get_mouse_over_item(mouse_point_);
 226         if (!r)
 227                 return;
 228
 229         QMenu *menu = r->create_context_menu(this);
 230         if (menu)
 231                 menu->exec(event->globalPos());
 232 }
 233
 234 void Ruler::keyPressEvent(QKeyEvent *e)
 235 {
 236         assert(e);
 237
 238         if (e->key() == Qt::Key_Delete)
 239         {
 240                 const vector< shared_ptr<TimeItem> > items(view_.time_items());
 241                 for (auto &i : items)
 242                         if (i->selected())
 243                                 i->delete_pressed();
 244         }
 245 }
 246
 247 void Ruler::draw_hover_mark(QPainter &p, int text_height)
 248 {
 249         const int x = view_.hover_point().x();
 250
 251         if (x == -1)
 252                 return;
 253
 254         p.setPen(QPen(Qt::NoPen));
 255         p.setBrush(QBrush(palette().color(foregroundRole())));
 256
 257         const int b = RulerHeight * text_height;
 258         const float hover_arrow_size = HoverArrowSize * text_height;
 259         const QPointF points[] = {
 260                 QPointF(x, b),
 261                 QPointF(x - hover_arrow_size, b - hover_arrow_size),
 262                 QPointF(x + hover_arrow_size, b - hover_arrow_size)
 263         };
 264         p.drawPolygon(points, countof(points));
 265 }
 266
 267 int Ruler::calculate_text_height() const
 268 {
 269         return QFontMetrics(font()).ascent();
 270 }
 271
 272 void Ruler::hover_point_changed()
 273 {
 274         update();
 275 }
 276
 277 } // namespace view
 278 } // namespace pv