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