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 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 int delta = e->pos().x() - mouse_down_point_.x();
 174         const vector< shared_ptr<TimeItem> > items(view_.time_items());
 175         for (auto &i : items)
 176                 if (i->dragging())
 177                         i->set_time(view_.offset() +
 178                                 (i->drag_point().x() + delta - 0.5) *
 179                                 view_.scale());
 180 }
 181
 182 void Ruler::mousePressEvent(QMouseEvent *e)
 183 {
 184         if (e->buttons() & Qt::LeftButton) {
 185                 mouse_down_point_ = e->pos();
 186                 mouse_down_item_ = get_mouse_over_item(e->pos());
 187
 188                 clear_selection();
 189
 190                 if (mouse_down_item_) {
 191                         mouse_down_item_->select();
 192                         mouse_down_item_->drag();
 193                 }
 194
 195                 selection_changed();
 196         }
 197 }
 198
 199 void Ruler::mouseReleaseEvent(QMouseEvent *)
 200 {
 201         using pv::widgets::Popup;
 202
 203         if (!dragging_ && mouse_down_item_) {
 204                 Popup *const p = mouse_down_item_->create_popup(&view_);
 205                 if (p) {
 206                         const QPoint arrpos(mouse_down_item_->get_x(),
 207                                 height() - ViewItem::HighlightRadius);
 208                         p->set_position(mapToGlobal(arrpos), Popup::Bottom);
 209                         p->show();
 210                 }
 211         }
 212
 213         dragging_ = false;
 214         mouse_down_item_.reset();
 215
 216         const vector< shared_ptr<TimeItem> > items(view_.time_items());
 217         for (auto &i : items)
 218                 i->drag_release();
 219 }
 220
 221 void Ruler::leaveEvent(QEvent*)
 222 {
 223         mouse_point_ = QPoint(-1, -1);
 224         update();
 225 }
 226
 227 void Ruler::mouseDoubleClickEvent(QMouseEvent *e)
 228 {
 229         view_.add_flag(view_.offset() + ((double)e->x() + 0.5) * view_.scale());
 230 }
 231
 232 void Ruler::keyPressEvent(QKeyEvent *e)
 233 {
 234         assert(e);
 235
 236         if (e->key() == Qt::Key_Delete)
 237         {
 238                 const vector< shared_ptr<TimeItem> > items(view_.time_items());
 239                 for (auto &i : items)
 240                         if (i->selected())
 241                                 i->delete_pressed();
 242         }
 243 }
 244
 245 void Ruler::draw_hover_mark(QPainter &p, int text_height)
 246 {
 247         const int x = view_.hover_point().x();
 248
 249         if (x == -1)
 250                 return;
 251
 252         p.setPen(QPen(Qt::NoPen));
 253         p.setBrush(QBrush(palette().color(foregroundRole())));
 254
 255         const int b = RulerHeight * text_height;
 256         const float hover_arrow_size = HoverArrowSize * text_height;
 257         const QPointF points[] = {
 258                 QPointF(x, b),
 259                 QPointF(x - hover_arrow_size, b - hover_arrow_size),
 260                 QPointF(x + hover_arrow_size, b - hover_arrow_size)
 261         };
 262         p.drawPolygon(points, countof(points));
 263 }
 264
 265 int Ruler::calculate_text_height() const
 266 {
 267         return QFontMetrics(font()).ascent();
 268 }
 269
 270 void Ruler::hover_point_changed()
 271 {
 272         update();
 273 }
 274
 275 } // namespace view
 276 } // namespace pv