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 #include <pv/widgets/popup.hpp>
  33
  34 using namespace Qt;
  35
  36 using std::shared_ptr;
  37 using std::vector;
  38
  39 namespace pv {
  40 namespace view {
  41
  42 const float Ruler::RulerHeight = 2.5f;  // x Text Height
  43 const int Ruler::MinorTickSubdivision = 4;
  44
  45 const float Ruler::HoverArrowSize = 0.5f;  // x Text Height
  46
  47 Ruler::Ruler(View &parent) :
  48         MarginWidget(parent)
  49 {
  50         setMouseTracking(true);
  51
  52         connect(&view_, SIGNAL(hover_point_changed()),
  53                 this, SLOT(hover_point_changed()));
  54 }
  55
  56 void Ruler::clear_selection()
  57 {
  58         const vector< shared_ptr<TimeItem> > items(view_.time_items());
  59         for (auto &i : items)
  60                 i->select(false);
  61         update();
  62 }
  63
  64 QSize Ruler::sizeHint() const
  65 {
  66         const int text_height = calculate_text_height();
  67         return QSize(0, RulerHeight * text_height);
  68 }
  69
  70 QSize Ruler::extended_size_hint() const
  71 {
  72         QRectF max_rect;
  73         std::vector< std::shared_ptr<TimeItem> > items(view_.time_items());
  74         for (auto &i : items)
  75                 max_rect = max_rect.united(i->label_rect(QRect()));
  76         return QSize(0, sizeHint().height() - max_rect.top() / 2 +
  77                 ViewItem::HighlightRadius);
  78 }
  79
  80 shared_ptr<TimeItem> Ruler::get_mouse_over_item(const QPoint &pt)
  81 {
  82         const vector< shared_ptr<TimeItem> > items(view_.time_items());
  83         for (auto i = items.rbegin(); i != items.rend(); i++)
  84                 if ((*i)->enabled() && (*i)->label_rect(rect()).contains(pt))
  85                         return *i;
  86         return nullptr;
  87 }
  88
  89 void Ruler::paintEvent(QPaintEvent*)
  90 {
  91         const int ValueMargin = 3;
  92
  93         QPainter p(this);
  94         p.setRenderHint(QPainter::Antialiasing);
  95
  96         const double tick_period = view_.tick_period();
  97         const unsigned int prefix = view_.tick_prefix();
  98
  99         // Draw the tick marks
 100         p.setPen(palette().color(foregroundRole()));
 101
 102         const double minor_tick_period = tick_period / MinorTickSubdivision;
 103         const double first_major_division =
 104                 floor(view_.offset() / tick_period);
 105         const double first_minor_division =
 106                 ceil(view_.offset() / minor_tick_period);
 107         const double t0 = first_major_division * tick_period;
 108
 109         int division = (int)round(first_minor_division -
 110                 first_major_division * MinorTickSubdivision) - 1;
 111
 112         const int text_height = calculate_text_height();
 113         const int ruler_height = RulerHeight * text_height;
 114         const int major_tick_y1 = text_height + ValueMargin * 2;
 115         const int minor_tick_y1 = (major_tick_y1 + ruler_height) / 2;
 116
 117         double x;
 118
 119         do {
 120                 const double t = t0 + division * minor_tick_period;
 121                 x = (t - view_.offset()) / view_.scale();
 122
 123                 if (division % MinorTickSubdivision == 0)
 124                 {
 125                         // Draw a major tick
 126                         p.drawText(x, ValueMargin, 0, text_height,
 127                                 AlignCenter | AlignTop | TextDontClip,
 128                                 pv::util::format_time(t, prefix));
 129                         p.drawLine(QPointF(x, major_tick_y1),
 130                                 QPointF(x, ruler_height));
 131                 }
 132                 else
 133                 {
 134                         // Draw a minor tick
 135                         p.drawLine(QPointF(x, minor_tick_y1),
 136                                 QPointF(x, ruler_height));
 137                 }
 138
 139                 division++;
 140
 141         } while (x < width());
 142
 143         // Draw the hover mark
 144         draw_hover_mark(p, text_height);
 145
 146         // The cursor labels are not drawn with the arrows exactly on the
 147         // bottom line of the widget, because then the selection shadow
 148         // would be clipped away.
 149         const QRect r = rect().adjusted(0, 0, 0, -ViewItem::HighlightRadius);
 150
 151         // Draw the items
 152         const vector< shared_ptr<TimeItem> > items(view_.time_items());
 153         for (auto &i : items) {
 154                 const bool highlight = !dragging_ &&
 155                         i->label_rect(r).contains(mouse_point_);
 156                 i->paint_label(p, r, highlight);
 157         }
 158 }
 159
 160 void Ruler::mouseMoveEvent(QMouseEvent *e)
 161 {
 162         mouse_point_ = e->pos();
 163
 164         if (!(e->buttons() & Qt::LeftButton))
 165                 return;
 166
 167         if ((e->pos() - mouse_down_point_).manhattanLength() <
 168                 QApplication::startDragDistance())
 169                 return;
 170
 171         // Do the drag
 172         dragging_ = true;
 173
 174         const QPoint delta = e->pos() - mouse_down_point_;
 175         const vector< shared_ptr<TimeItem> > items(view_.time_items());
 176         for (auto &i : items)
 177                 if (i->dragging())
 178                         i->drag_by(delta);
 179 }
 180
 181 void Ruler::mousePressEvent(QMouseEvent *e)
 182 {
 183         if (e->buttons() & Qt::LeftButton) {
 184                 mouse_down_point_ = e->pos();
 185                 mouse_down_item_ = get_mouse_over_item(e->pos());
 186
 187                 clear_selection();
 188
 189                 if (mouse_down_item_) {
 190                         mouse_down_item_->select();
 191                         mouse_down_item_->drag();
 192                 }
 193
 194                 selection_changed();
 195         }
 196 }
 197
 198 void Ruler::mouseReleaseEvent(QMouseEvent *)
 199 {
 200         using pv::widgets::Popup;
 201
 202         if (!dragging_ && mouse_down_item_) {
 203                 Popup *const p = mouse_down_item_->create_popup(&view_);
 204                 if (p) {
 205                         const QPoint arrpos(mouse_down_item_->get_x(),
 206                                 height() - ViewItem::HighlightRadius);
 207                         p->set_position(mapToGlobal(arrpos), Popup::Bottom);
 208                         p->show();
 209                 }
 210         }
 211
 212         dragging_ = false;
 213         mouse_down_item_.reset();
 214
 215         const vector< shared_ptr<TimeItem> > items(view_.time_items());
 216         for (auto &i : items)
 217                 i->drag_release();
 218 }
 219
 220 void Ruler::leaveEvent(QEvent*)
 221 {
 222         mouse_point_ = QPoint(-1, -1);
 223         update();
 224 }
 225
 226 void Ruler::mouseDoubleClickEvent(QMouseEvent *e)
 227 {
 228         view_.add_flag(view_.offset() + ((double)e->x() + 0.5) * view_.scale());
 229 }
 230
 231 void Ruler::contextMenuEvent(QContextMenuEvent *event)
 232 {
 233         const shared_ptr<TimeItem> r = get_mouse_over_item(mouse_point_);
 234         if (!r)
 235                 return;
 236
 237         QMenu *menu = r->create_context_menu(this);
 238         if (menu)
 239                 menu->exec(event->globalPos());
 240 }
 241
 242 void Ruler::keyPressEvent(QKeyEvent *e)
 243 {
 244         assert(e);
 245
 246         if (e->key() == Qt::Key_Delete)
 247         {
 248                 const vector< shared_ptr<TimeItem> > items(view_.time_items());
 249                 for (auto &i : items)
 250                         if (i->selected())
 251                                 i->delete_pressed();
 252         }
 253 }
 254
 255 void Ruler::draw_hover_mark(QPainter &p, int text_height)
 256 {
 257         const int x = view_.hover_point().x();
 258
 259         if (x == -1)
 260                 return;
 261
 262         p.setPen(QPen(Qt::NoPen));
 263         p.setBrush(QBrush(palette().color(foregroundRole())));
 264
 265         const int b = RulerHeight * text_height;
 266         const float hover_arrow_size = HoverArrowSize * text_height;
 267         const QPointF points[] = {
 268                 QPointF(x, b),
 269                 QPointF(x - hover_arrow_size, b - hover_arrow_size),
 270                 QPointF(x + hover_arrow_size, b - hover_arrow_size)
 271         };
 272         p.drawPolygon(points, countof(points));
 273 }
 274
 275 int Ruler::calculate_text_height() const
 276 {
 277         return QFontMetrics(font()).ascent();
 278 }
 279
 280 void Ruler::hover_point_changed()
 281 {
 282         update();
 283 }
 284
 285 } // namespace view
 286 } // namespace pv