pulseview_cross.nsi.in: Use Python 3.4 (Windows XP support).
[pulseview.git] / pv / view / signalscalehandle.cpp
1 /*
2  * This file is part of the PulseView project.
3  *
4  * Copyright (C) 2015 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 <algorithm>
21
22 #include <QRadialGradient>
23
24 #include "signal.hpp"
25 #include "signalscalehandle.hpp"
26 #include "tracetreeitemowner.hpp"
27
28 using std::max;
29 using std::min;
30
31 namespace pv {
32 namespace views {
33 namespace TraceView {
34
35 SignalScaleHandle::SignalScaleHandle(Signal &owner) :
36         owner_(owner)
37 {
38 }
39
40 bool SignalScaleHandle::enabled() const
41 {
42         return selected() || owner_.selected();
43 }
44
45 void SignalScaleHandle::select(bool select)
46 {
47         ViewItem::select(select);
48         owner_.owner()->row_item_appearance_changed(true, true);
49 }
50
51 void SignalScaleHandle::drag_release()
52 {
53         RowItem::drag_release();
54         owner_.scale_handle_released();
55         owner_.owner()->row_item_appearance_changed(true, true);
56 }
57
58 void SignalScaleHandle::drag_by(const QPoint &delta)
59 {
60         owner_.scale_handle_dragged(
61                 drag_point_.y() + delta.y() - owner_.get_visual_y());
62         owner_.owner()->row_item_appearance_changed(true, true);
63 }
64
65 QPoint SignalScaleHandle::point(const QRect &rect) const
66 {
67         return owner_.point(rect) + QPoint(0, owner_.scale_handle_offset());
68 }
69
70 QRectF SignalScaleHandle::hit_box_rect(const ViewItemPaintParams &pp) const
71 {
72         const int text_height = ViewItemPaintParams::text_height();
73         const double x = -pp.pixels_offset() - text_height / 2;
74         const double min_x = pp.left() + text_height;
75         const double max_x = pp.right() - text_height * 2;
76         return QRectF(min(max(x, min_x), max_x),
77                 owner_.get_visual_y() + owner_.scale_handle_offset() -
78                         text_height / 2,
79                 text_height, text_height);
80 }
81
82 void SignalScaleHandle::paint_fore(QPainter &p, const ViewItemPaintParams &pp)
83 {
84         if (!enabled())
85                 return;
86
87         const QRectF r(hit_box_rect(pp));
88         const QPointF c = (r.topLeft() + 2 * r.center()) / 3;
89         QRadialGradient gradient(c, r.width(), c);
90
91         if (selected()) {
92                 gradient.setColorAt(0.0, QColor(255, 255, 255));
93                 gradient.setColorAt(0.75, QColor(192, 192, 192));
94                 gradient.setColorAt(1.0, QColor(128, 128, 128));
95         } else {
96                 gradient.setColorAt(0.0, QColor(192, 192, 192));
97                 gradient.setColorAt(0.75, QColor(128, 128, 128));
98                 gradient.setColorAt(1.0, QColor(128, 128, 128));
99         }
100
101         p.setBrush(QBrush(gradient));
102         p.setPen(QColor(128, 128, 128));
103         p.drawEllipse(r);
104 }
105
106 } // namespace TraceView
107 } // namespace views
108 } // namespace pv