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