pv/view/trace.cpp

   1 /*
   2  * This file is part of the PulseView project.
   3  *
   4  * Copyright (C) 2013 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 <assert.h>
  24 #include <math.h>
  25
  26 #include <QApplication>
  27 #include <QFormLayout>
  28 #include <QKeyEvent>
  29 #include <QLineEdit>
  30
  31 #include "trace.h"
  32 #include "tracepalette.h"
  33 #include "view.h"
  34
  35 #include <pv/widgets/colourbutton.h>
  36 #include <pv/widgets/popup.h>
  37
  38 namespace pv {
  39 namespace view {
  40
  41 const QPen Trace::AxisPen(QColor(128, 128, 128, 64));
  42 const int Trace::LabelHitPadding = 2;
  43
  44 Trace::Trace(QString name) :
  45         _name(name),
  46         _popup(NULL),
  47         _popup_form(NULL)
  48 {
  49 }
  50
  51 QString Trace::name() const
  52 {
  53         return _name;
  54 }
  55
  56 void Trace::set_name(QString name)
  57 {
  58         _name = name;
  59 }
  60
  61 QColor Trace::colour() const
  62 {
  63         return _colour;
  64 }
  65
  66 void Trace::set_colour(QColor colour)
  67 {
  68         _colour = colour;
  69 }
  70
  71 void Trace::paint_label(QPainter &p, int right, bool hover)
  72 {
  73         const int y = get_y();
  74
  75         p.setBrush(_colour);
  76
  77         if (!enabled())
  78                 return;
  79
  80         const QRectF r = label_rect(right);
  81
  82         // Paint the label
  83         const float label_arrow_length = r.height() / 2;
  84         const QPointF points[] = {
  85                 r.topLeft(),
  86                 QPointF(r.right() - label_arrow_length, r.top()),
  87                 QPointF(r.right(), y),
  88                 QPointF(r.right() - label_arrow_length, r.bottom()),
  89                 r.bottomLeft()
  90         };
  91         const QPointF highlight_points[] = {
  92                 QPointF(r.left() + 1, r.top() + 1),
  93                 QPointF(r.right() - label_arrow_length, r.top() + 1),
  94                 QPointF(r.right() - 1, y),
  95                 QPointF(r.right() - label_arrow_length, r.bottom() - 1),
  96                 QPointF(r.left() + 1, r.bottom() - 1)
  97         };
  98
  99         if (selected()) {
 100                 p.setPen(highlight_pen());
 101                 p.setBrush(Qt::transparent);
 102                 p.drawPolygon(points, countof(points));
 103         }
 104
 105         p.setPen(Qt::transparent);
 106         p.setBrush(hover ? _colour.lighter() : _colour);
 107         p.drawPolygon(points, countof(points));
 108
 109         p.setPen(_colour.lighter());
 110         p.setBrush(Qt::transparent);
 111         p.drawPolygon(highlight_points, countof(highlight_points));
 112
 113         p.setPen(_colour.darker());
 114         p.setBrush(Qt::transparent);
 115         p.drawPolygon(points, countof(points));
 116
 117         // Paint the text
 118         p.setPen(get_text_colour());
 119         p.setFont(QApplication::font());
 120         p.drawText(QRectF(r.x(), r.y(),
 121                 r.width() - label_arrow_length, r.height()),
 122                 Qt::AlignCenter | Qt::AlignVCenter, _name);
 123 }
 124
 125 QMenu* Trace::create_context_menu(QWidget *parent)
 126 {
 127         QMenu *const menu = SelectableItem::create_context_menu(parent);
 128
 129         return menu;
 130 }
 131
 132 pv::widgets::Popup* Trace::create_popup(QWidget *parent)
 133 {
 134         using pv::widgets::Popup;
 135
 136         _popup = new Popup(parent);
 137
 138         create_popup_form();
 139
 140         connect(_popup, SIGNAL(closed()),
 141                 this, SLOT(on_popup_closed()));
 142
 143         return _popup;
 144 }
 145
 146 QRectF Trace::label_rect(int right) const
 147 {
 148         using pv::view::View;
 149
 150         QFontMetrics m(QApplication::font());
 151         const QSize text_size(
 152                 m.boundingRect(QRect(), 0, _name).width(),
 153                 m.boundingRect(QRect(), 0, "Tg").height());
 154         const QSizeF label_size(
 155                 text_size.width() + View::LabelPadding.width() * 2,
 156                 ceilf((text_size.height() + View::LabelPadding.height() * 2) / 2) * 2);
 157         const float half_height = label_size.height() / 2;
 158         return QRectF(
 159                 right - half_height - label_size.width() - 0.5,
 160                 get_y() + 0.5f - half_height,
 161                 label_size.width() + half_height,
 162                 label_size.height());
 163 }
 164
 165 QColor Trace::get_text_colour() const
 166 {
 167         return (_colour.lightness() > 64) ? Qt::black : Qt::white;
 168 }
 169
 170 void Trace::paint_axis(QPainter &p, int y, int left, int right)
 171 {
 172         p.setPen(AxisPen);
 173         p.drawLine(QPointF(left, y + 0.5f), QPointF(right, y + 0.5f));
 174 }
 175
 176 void Trace::add_colour_option(QWidget *parent, QFormLayout *form)
 177 {
 178         using pv::widgets::ColourButton;
 179
 180         ColourButton *const colour_button = new ColourButton(
 181                 TracePalette::Rows, TracePalette::Cols, parent);
 182         colour_button->set_palette(TracePalette::Colours);
 183         colour_button->set_colour(_colour);
 184         connect(colour_button, SIGNAL(selected(const QColor&)),
 185                 this, SLOT(on_colour_changed(const QColor&)));
 186
 187         form->addRow(tr("Colour"), colour_button);
 188 }
 189
 190 void Trace::create_popup_form()
 191 {
 192         // Clear the layout
 193
 194         // Transfer the layout and the child widgets to a temporary widget
 195         // which then goes out of scope destroying the layout and all the child
 196         // widgets.
 197         if (_popup_form)
 198                 QWidget().setLayout(_popup_form);
 199
 200         // Repopulate the popup
 201         _popup_form = new QFormLayout(_popup);
 202         _popup->setLayout(_popup_form);
 203         populate_popup_form(_popup, _popup_form);
 204 }
 205
 206 void Trace::populate_popup_form(QWidget *parent, QFormLayout *form)
 207 {
 208         QLineEdit *const name_edit = new QLineEdit(parent);
 209         name_edit->setText(_name);
 210         connect(name_edit, SIGNAL(textChanged(const QString&)),
 211                 this, SLOT(on_text_changed(const QString&)));
 212         form->addRow(tr("Name"), name_edit);
 213
 214         add_colour_option(parent, form);
 215 }
 216
 217 void Trace::on_popup_closed()
 218 {
 219         _popup = NULL;
 220         _popup_form = NULL;
 221 }
 222
 223 void Trace::on_text_changed(const QString &text)
 224 {
 225         set_name(text);
 226         text_changed();
 227 }
 228
 229 void Trace::on_colour_changed(const QColor &colour)
 230 {
 231         set_colour(colour);
 232         colour_changed();
 233 }
 234
 235 } // namespace view
 236 } // namespace pv