Introduce DecodeSignal class
[pulseview.git] / pv / views / trace / 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, see <http://www.gnu.org/licenses/>.
18  */
19
20 #include <extdef.h>
21
22 #include <cassert>
23 #include <cmath>
24
25 #include <QApplication>
26 #include <QFormLayout>
27 #include <QKeyEvent>
28 #include <QLineEdit>
29
30 #include "trace.hpp"
31 #include "tracepalette.hpp"
32 #include "view.hpp"
33
34 #include "pv/globalsettings.hpp"
35 #include "pv/widgets/colourbutton.hpp"
36 #include "pv/widgets/popup.hpp"
37
38 using std::pair;
39 using std::shared_ptr;
40
41 namespace pv {
42 namespace views {
43 namespace trace {
44
45 const QPen Trace::AxisPen(QColor(0, 0, 0, 30 * 256 / 100));
46 const int Trace::LabelHitPadding = 2;
47
48 const QColor Trace::BrightGrayBGColour = QColor(0, 0, 0, 10 * 255 / 100);
49 const QColor Trace::DarkGrayBGColour = QColor(0, 0, 0, 15 * 255 / 100);
50
51 Trace::Trace(shared_ptr<data::SignalBase> channel) :
52         base_(channel),
53         popup_(nullptr),
54         popup_form_(nullptr)
55 {
56         connect(channel.get(), SIGNAL(name_changed(const QString&)),
57                 this, SLOT(on_name_changed(const QString&)));
58         connect(channel.get(), SIGNAL(colour_changed(const QColor&)),
59                 this, SLOT(on_colour_changed(const QColor&)));
60 }
61
62 shared_ptr<data::SignalBase> Trace::base() const
63 {
64         return base_;
65 }
66
67 void Trace::paint_label(QPainter &p, const QRect &rect, bool hover)
68 {
69         const int y = get_visual_y();
70
71         p.setBrush(base_->colour());
72
73         if (!enabled())
74                 return;
75
76         const QRectF r = label_rect(rect);
77
78         // When selected, move the arrow to the left so that the border can show
79         const QPointF offs = (selected()) ? QPointF(-2, 0) : QPointF(0, 0);
80
81         // Paint the label
82         const float label_arrow_length = r.height() / 2;
83         QPointF points[] = {
84                 offs + r.topLeft(),
85                 offs + QPointF(r.right() - label_arrow_length, r.top()),
86                 offs + QPointF(r.right(), y),
87                 offs + QPointF(r.right() - label_arrow_length, r.bottom()),
88                 offs + r.bottomLeft()
89         };
90         QPointF highlight_points[] = {
91                 offs + QPointF(r.left() + 1, r.top() + 1),
92                 offs + QPointF(r.right() - label_arrow_length, r.top() + 1),
93                 offs + QPointF(r.right() - 1, y),
94                 offs + QPointF(r.right() - label_arrow_length, r.bottom() - 1),
95                 offs + QPointF(r.left() + 1, r.bottom() - 1)
96         };
97
98         if (selected()) {
99                 p.setPen(highlight_pen());
100                 p.setBrush(Qt::transparent);
101                 p.drawPolygon(points, countof(points));
102         }
103
104         p.setPen(Qt::transparent);
105         p.setBrush(hover ? base_->colour().lighter() : base_->colour());
106         p.drawPolygon(points, countof(points));
107
108         p.setPen(base_->colour().lighter());
109         p.setBrush(Qt::transparent);
110         p.drawPolygon(highlight_points, countof(highlight_points));
111
112         p.setPen(base_->colour().darker());
113         p.setBrush(Qt::transparent);
114         p.drawPolygon(points, countof(points));
115
116         // Paint the text
117         p.setPen(select_text_colour(base_->colour()));
118         p.setFont(QApplication::font());
119         p.drawText(QRectF(r.x(), r.y(),
120                 r.width() - label_arrow_length, r.height()),
121                 Qt::AlignCenter | Qt::AlignVCenter, base_->name());
122 }
123
124 QMenu* Trace::create_context_menu(QWidget *parent)
125 {
126         QMenu *const menu = ViewItem::create_context_menu(parent);
127
128         return menu;
129 }
130
131 pv::widgets::Popup* Trace::create_popup(QWidget *parent)
132 {
133         using pv::widgets::Popup;
134
135         popup_ = new Popup(parent);
136         popup_->set_position(parent->mapToGlobal(
137                 point(parent->rect())), Popup::Right);
138
139         create_popup_form();
140
141         connect(popup_, SIGNAL(closed()), this, SLOT(on_popup_closed()));
142
143         return popup_;
144 }
145
146 QRectF Trace::label_rect(const QRectF &rect) const
147 {
148         QFontMetrics m(QApplication::font());
149         const QSize text_size(
150                 m.boundingRect(QRect(), 0, base_->name()).width(), m.height());
151         const QSizeF label_size(
152                 text_size.width() + LabelPadding.width() * 2,
153                 ceilf((text_size.height() + LabelPadding.height() * 2) / 2) * 2);
154         const float half_height = label_size.height() / 2;
155         return QRectF(
156                 rect.right() - half_height - label_size.width() - 0.5,
157                 get_visual_y() + 0.5f - half_height,
158                 label_size.width() + half_height,
159                 label_size.height());
160 }
161
162 void Trace::paint_back(QPainter &p, ViewItemPaintParams &pp)
163 {
164         const View *view = owner_->view();
165         assert(view);
166
167         if (view->coloured_bg())
168                 p.setBrush(base_->bgcolour());
169         else
170                 p.setBrush(pp.next_bg_colour_state() ? BrightGrayBGColour : DarkGrayBGColour);
171
172         p.setPen(QPen(Qt::NoPen));
173
174         const pair<int, int> extents = v_extents();
175         p.drawRect(pp.left(), get_visual_y() + extents.first,
176                 pp.width(), extents.second - extents.first);
177 }
178
179 void Trace::paint_axis(QPainter &p, ViewItemPaintParams &pp, int y)
180 {
181         p.setRenderHint(QPainter::Antialiasing, false);
182
183         p.setPen(AxisPen);
184         p.drawLine(QPointF(pp.left(), y), QPointF(pp.right(), y));
185
186         p.setRenderHint(QPainter::Antialiasing, true);
187 }
188
189 void Trace::add_colour_option(QWidget *parent, QFormLayout *form)
190 {
191         using pv::widgets::ColourButton;
192
193         ColourButton *const colour_button = new ColourButton(
194                 TracePalette::Rows, TracePalette::Cols, parent);
195         colour_button->set_palette(TracePalette::Colours);
196         colour_button->set_colour(base_->colour());
197         connect(colour_button, SIGNAL(selected(const QColor&)),
198                 this, SLOT(on_colouredit_changed(const QColor&)));
199
200         form->addRow(tr("Colour"), colour_button);
201 }
202
203 void Trace::create_popup_form()
204 {
205         // Clear the layout
206
207         // Transfer the layout and the child widgets to a temporary widget
208         // which we delete after the event was handled. This way, the layout
209         // and all widgets contained therein are deleted after the event was
210         // handled, leaving the parent popup_ time to handle the change.
211         if (popup_form_) {
212                 QWidget *suicidal = new QWidget();
213                 suicidal->setLayout(popup_form_);
214                 suicidal->deleteLater();
215         }
216
217         // Repopulate the popup
218         popup_form_ = new QFormLayout(popup_);
219         popup_->setLayout(popup_form_);
220         populate_popup_form(popup_, popup_form_);
221 }
222
223 void Trace::populate_popup_form(QWidget *parent, QFormLayout *form)
224 {
225         QLineEdit *const name_edit = new QLineEdit(parent);
226         name_edit->setText(base_->name());
227         connect(name_edit, SIGNAL(textChanged(const QString&)),
228                 this, SLOT(on_nameedit_changed(const QString&)));
229         form->addRow(tr("Name"), name_edit);
230
231         add_colour_option(parent, form);
232 }
233
234 void Trace::set_name(QString name)
235 {
236         base_->set_name(name);
237 }
238
239 void Trace::set_colour(QColor colour)
240 {
241         base_->set_colour(colour);
242 }
243
244 void Trace::on_name_changed(const QString &text)
245 {
246         /* This event handler is called by SignalBase when the name was changed there */
247         (void)text;
248
249         if (owner_) {
250                 owner_->extents_changed(true, false);
251                 owner_->row_item_appearance_changed(true, false);
252         }
253 }
254
255 void Trace::on_colour_changed(const QColor &colour)
256 {
257         /* This event handler is called by SignalBase when the colour was changed there */
258         (void)colour;
259
260         if (owner_)
261                 owner_->row_item_appearance_changed(true, true);
262 }
263
264 void Trace::on_popup_closed()
265 {
266         popup_ = nullptr;
267         popup_form_ = nullptr;
268 }
269
270 void Trace::on_nameedit_changed(const QString &name)
271 {
272         /* This event handler notifies SignalBase that the name changed */
273         set_name(name);
274 }
275
276 void Trace::on_colouredit_changed(const QColor &colour)
277 {
278         /* This event handler notifies SignalBase that the colour changed */
279         set_colour(colour);
280 }
281
282 } // namespace trace
283 } // namespace views
284 } // namespace pv