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 vector< shared_ptr<ViewItem> > Ruler::items()
  80 {
  81         const vector< shared_ptr<TimeItem> > time_items(view_.time_items());
  82         return vector< shared_ptr<ViewItem> >(
  83                 time_items.begin(), time_items.end());
  84 }
  85
  86 shared_ptr<ViewItem> Ruler::get_mouse_over_item(const QPoint &pt)
  87 {
  88         const vector< shared_ptr<TimeItem> > items(view_.time_items());
  89         for (auto i = items.rbegin(); i != items.rend(); i++)
  90                 if ((*i)->enabled() && (*i)->label_rect(rect()).contains(pt))
  91                         return *i;
  92         return nullptr;
  93 }
  94
  95 void Ruler::paintEvent(QPaintEvent*)
  96 {
  97         const int ValueMargin = 3;
  98
  99         QPainter p(this);
 100         p.setRenderHint(QPainter::Antialiasing);
 101
 102         const double tick_period = view_.tick_period();
 103         const unsigned int prefix = view_.tick_prefix();
 104
 105         // Draw the tick marks
 106         p.setPen(palette().color(foregroundRole()));
 107
 108         const double minor_tick_period = tick_period / MinorTickSubdivision;
 109         const double first_major_division =
 110                 floor(view_.offset() / tick_period);
 111         const double first_minor_division =
 112                 ceil(view_.offset() / minor_tick_period);
 113         const double t0 = first_major_division * tick_period;
 114
 115         int division = (int)round(first_minor_division -
 116                 first_major_division * MinorTickSubdivision) - 1;
 117
 118         const int text_height = calculate_text_height();
 119         const int ruler_height = RulerHeight * text_height;
 120         const int major_tick_y1 = text_height + ValueMargin * 2;
 121         const int minor_tick_y1 = (major_tick_y1 + ruler_height) / 2;
 122
 123         double x;
 124
 125         do {
 126                 const double t = t0 + division * minor_tick_period;
 127                 x = (t - view_.offset()) / view_.scale();
 128
 129                 if (division % MinorTickSubdivision == 0)
 130                 {
 131                         // Draw a major tick
 132                         p.drawText(x, ValueMargin, 0, text_height,
 133                                 AlignCenter | AlignTop | TextDontClip,
 134                                 pv::util::format_time(t, prefix));
 135                         p.drawLine(QPointF(x, major_tick_y1),
 136                                 QPointF(x, ruler_height));
 137                 }
 138                 else
 139                 {
 140                         // Draw a minor tick
 141                         p.drawLine(QPointF(x, minor_tick_y1),
 142                                 QPointF(x, ruler_height));
 143                 }
 144
 145                 division++;
 146
 147         } while (x < width());
 148
 149         // Draw the hover mark
 150         draw_hover_mark(p, text_height);
 151
 152         // The cursor labels are not drawn with the arrows exactly on the
 153         // bottom line of the widget, because then the selection shadow
 154         // would be clipped away.
 155         const QRect r = rect().adjusted(0, 0, 0, -ViewItem::HighlightRadius);
 156
 157         // Draw the items
 158         const vector< shared_ptr<TimeItem> > items(view_.time_items());
 159         for (auto &i : items) {
 160                 const bool highlight = !dragging_ &&
 161                         i->label_rect(r).contains(mouse_point_);
 162                 i->paint_label(p, r, highlight);
 163         }
 164 }
 165
 166 void Ruler::mouseMoveEvent(QMouseEvent *e)
 167 {
 168         mouse_point_ = e->pos();
 169
 170         if (!(e->buttons() & Qt::LeftButton))
 171                 return;
 172
 173         if ((e->pos() - mouse_down_point_).manhattanLength() <
 174                 QApplication::startDragDistance())
 175                 return;
 176
 177         // Do the drag
 178         dragging_ = true;
 179
 180         const QPoint delta = e->pos() - mouse_down_point_;
 181         const vector< shared_ptr<TimeItem> > items(view_.time_items());
 182         for (auto &i : items)
 183                 if (i->dragging())
 184                         i->drag_by(delta);
 185 }
 186
 187 void Ruler::mousePressEvent(QMouseEvent *e)
 188 {
 189         if (e->buttons() & Qt::LeftButton) {
 190                 mouse_down_point_ = e->pos();
 191                 mouse_down_item_ = get_mouse_over_item(e->pos());
 192
 193                 clear_selection();
 194
 195                 if (mouse_down_item_) {
 196                         mouse_down_item_->select();
 197                         mouse_down_item_->drag();
 198                 }
 199
 200                 selection_changed();
 201         }
 202 }
 203
 204 void Ruler::mouseReleaseEvent(QMouseEvent *)
 205 {
 206         using pv::widgets::Popup;
 207
 208         if (!dragging_ && mouse_down_item_)
 209                 show_popup(mouse_down_item_);
 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::mouseDoubleClickEvent(QMouseEvent *e)
 220 {
 221         view_.add_flag(view_.offset() + ((double)e->x() + 0.5) * view_.scale());
 222 }
 223
 224 void Ruler::contextMenuEvent(QContextMenuEvent *event)
 225 {
 226         const shared_ptr<ViewItem> r = get_mouse_over_item(mouse_point_);
 227         if (!r)
 228                 return;
 229
 230         QMenu *menu = r->create_context_menu(this);
 231         if (menu)
 232                 menu->exec(event->globalPos());
 233 }
 234
 235 void Ruler::keyPressEvent(QKeyEvent *e)
 236 {
 237         assert(e);
 238
 239         if (e->key() == Qt::Key_Delete)
 240         {
 241                 const vector< shared_ptr<TimeItem> > items(view_.time_items());
 242                 for (auto &i : items)
 243                         if (i->selected())
 244                                 i->delete_pressed();
 245         }
 246 }
 247
 248 void Ruler::draw_hover_mark(QPainter &p, int text_height)
 249 {
 250         const int x = view_.hover_point().x();
 251
 252         if (x == -1)
 253                 return;
 254
 255         p.setPen(QPen(Qt::NoPen));
 256         p.setBrush(QBrush(palette().color(foregroundRole())));
 257
 258         const int b = RulerHeight * text_height;
 259         const float hover_arrow_size = HoverArrowSize * text_height;
 260         const QPointF points[] = {
 261                 QPointF(x, b),
 262                 QPointF(x - hover_arrow_size, b - hover_arrow_size),
 263                 QPointF(x + hover_arrow_size, b - hover_arrow_size)
 264         };
 265         p.drawPolygon(points, countof(points));
 266 }
 267
 268 int Ruler::calculate_text_height() const
 269 {
 270         return QFontMetrics(font()).ascent();
 271 }
 272
 273 void Ruler::hover_point_changed()
 274 {
 275         update();
 276 }
 277
 278 } // namespace view
 279 } // namespace pv