MainBar: Catch errors listing the config keys
[pulseview.git] / pv / view / ruler.cpp
1 /*
2  * This file is part of the PulseView project.
3  *
4  * Copyright (C) 2012 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 <QApplication>
24 #include <QFontMetrics>
25 #include <QMouseEvent>
26
27 #include "ruler.hpp"
28 #include "view.hpp"
29
30 #include <pv/util.hpp>
31
32 using namespace Qt;
33
34 using std::shared_ptr;
35 using std::vector;
36
37 namespace pv {
38 namespace view {
39
40 const float Ruler::RulerHeight = 2.5f;  // x Text Height
41 const int Ruler::MinorTickSubdivision = 4;
42
43 const float Ruler::HoverArrowSize = 0.5f;  // x Text Height
44
45 Ruler::Ruler(View &parent) :
46         MarginWidget(parent)
47 {
48         setMouseTracking(true);
49
50         connect(&view_, SIGNAL(hover_point_changed()),
51                 this, SLOT(hover_point_changed()));
52 }
53
54 QSize Ruler::sizeHint() const
55 {
56         const int text_height = calculate_text_height();
57         return QSize(0, RulerHeight * text_height);
58 }
59
60 QSize Ruler::extended_size_hint() const
61 {
62         QRectF max_rect;
63         std::vector< std::shared_ptr<TimeItem> > items(view_.time_items());
64         for (auto &i : items)
65                 max_rect = max_rect.united(i->label_rect(QRect()));
66         return QSize(0, sizeHint().height() - max_rect.top() / 2 +
67                 ViewItem::HighlightRadius);
68 }
69
70 vector< shared_ptr<ViewItem> > Ruler::items()
71 {
72         const vector< shared_ptr<TimeItem> > time_items(view_.time_items());
73         return vector< shared_ptr<ViewItem> >(
74                 time_items.begin(), time_items.end());
75 }
76
77 shared_ptr<ViewItem> Ruler::get_mouse_over_item(const QPoint &pt)
78 {
79         const vector< shared_ptr<TimeItem> > items(view_.time_items());
80         for (auto i = items.rbegin(); i != items.rend(); i++)
81                 if ((*i)->enabled() && (*i)->label_rect(rect()).contains(pt))
82                         return *i;
83         return nullptr;
84 }
85
86 void Ruler::paintEvent(QPaintEvent*)
87 {
88         const int ValueMargin = 3;
89
90         QPainter p(this);
91         p.setRenderHint(QPainter::Antialiasing);
92
93         const double tick_period = view_.tick_period();
94         const unsigned int prefix = view_.tick_prefix();
95
96         // Draw the tick marks
97         p.setPen(palette().color(foregroundRole()));
98
99         const double minor_tick_period = tick_period / MinorTickSubdivision;
100         const double first_major_division =
101                 floor(view_.offset() / tick_period);
102         const double first_minor_division =
103                 ceil(view_.offset() / minor_tick_period);
104         const double t0 = first_major_division * tick_period;
105
106         int division = (int)round(first_minor_division -
107                 first_major_division * MinorTickSubdivision) - 1;
108
109         const int text_height = calculate_text_height();
110         const int ruler_height = RulerHeight * text_height;
111         const int major_tick_y1 = text_height + ValueMargin * 2;
112         const int minor_tick_y1 = (major_tick_y1 + ruler_height) / 2;
113
114         double x;
115
116         do {
117                 const double t = t0 + division * minor_tick_period;
118                 x = (t - view_.offset()) / view_.scale();
119
120                 if (division % MinorTickSubdivision == 0)
121                 {
122                         // Draw a major tick
123                         p.drawText(x, ValueMargin, 0, text_height,
124                                 AlignCenter | AlignTop | TextDontClip,
125                                 pv::util::format_time(t, prefix));
126                         p.drawLine(QPointF(x, major_tick_y1),
127                                 QPointF(x, ruler_height));
128                 }
129                 else
130                 {
131                         // Draw a minor tick
132                         p.drawLine(QPointF(x, minor_tick_y1),
133                                 QPointF(x, ruler_height));
134                 }
135
136                 division++;
137
138         } while (x < width());
139
140         // Draw the hover mark
141         draw_hover_mark(p, text_height);
142
143         // The cursor labels are not drawn with the arrows exactly on the
144         // bottom line of the widget, because then the selection shadow
145         // would be clipped away.
146         const QRect r = rect().adjusted(0, 0, 0, -ViewItem::HighlightRadius);
147
148         // Draw the items
149         const vector< shared_ptr<TimeItem> > items(view_.time_items());
150         for (auto &i : items) {
151                 const bool highlight = !item_dragging_ &&
152                         i->label_rect(r).contains(mouse_point_);
153                 i->paint_label(p, r, highlight);
154         }
155 }
156
157 void Ruler::mouseDoubleClickEvent(QMouseEvent *e)
158 {
159         view_.add_flag(view_.offset() + ((double)e->x() + 0.5) * view_.scale());
160 }
161
162 void Ruler::draw_hover_mark(QPainter &p, int text_height)
163 {
164         const int x = view_.hover_point().x();
165
166         if (x == -1)
167                 return;
168
169         p.setPen(QPen(Qt::NoPen));
170         p.setBrush(QBrush(palette().color(foregroundRole())));
171
172         const int b = RulerHeight * text_height;
173         const float hover_arrow_size = HoverArrowSize * text_height;
174         const QPointF points[] = {
175                 QPointF(x, b),
176                 QPointF(x - hover_arrow_size, b - hover_arrow_size),
177                 QPointF(x + hover_arrow_size, b - hover_arrow_size)
178         };
179         p.drawPolygon(points, countof(points));
180 }
181
182 int Ruler::calculate_text_height() const
183 {
184         return QFontMetrics(font()).ascent();
185 }
186
187 void Ruler::hover_point_changed()
188 {
189         update();
190 }
191
192 } // namespace view
193 } // namespace pv