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