TimeMarker: Simplified label_rect
[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 #include <pv/widgets/popup.hpp>
32
33 using namespace Qt;
34
35 using std::shared_ptr;
36 using std::vector;
37
38 namespace pv {
39 namespace view {
40
41 const float Ruler::RulerHeight = 2.5f;  // x Text Height
42 const int Ruler::MinorTickSubdivision = 4;
43
44 const float Ruler::HoverArrowSize = 0.5f;  // x Text Height
45
46 const int Ruler::Padding = 20;
47
48 Ruler::Ruler(View &parent) :
49         MarginWidget(parent)
50 {
51         setMouseTracking(true);
52
53         connect(&view_, SIGNAL(hover_point_changed()),
54                 this, SLOT(hover_point_changed()));
55 }
56
57 void Ruler::clear_selection()
58 {
59         const vector< shared_ptr<TimeItem> > items(view_.time_items());
60         for (auto &i : items)
61                 i->select(false);
62         update();
63 }
64
65 QSize Ruler::sizeHint() const
66 {
67         const int text_height = calculate_text_height();
68         return QSize(0, RulerHeight * text_height);
69 }
70
71 QSize Ruler::extended_size_hint() const
72 {
73         const int text_height = calculate_text_height();
74         return QSize(0, RulerHeight * text_height +
75                 (text_height + Padding + ViewItem::HighlightRadius) / 2);
76 }
77
78 void Ruler::paintEvent(QPaintEvent*)
79 {
80         const int ValueMargin = 3;
81
82         QPainter p(this);
83         p.setRenderHint(QPainter::Antialiasing);
84
85         const double tick_period = view_.tick_period();
86         const unsigned int prefix = view_.tick_prefix();
87
88         // Draw the tick marks
89         p.setPen(palette().color(foregroundRole()));
90
91         const double minor_tick_period = tick_period / MinorTickSubdivision;
92         const double first_major_division =
93                 floor(view_.offset() / tick_period);
94         const double first_minor_division =
95                 ceil(view_.offset() / minor_tick_period);
96         const double t0 = first_major_division * tick_period;
97
98         int division = (int)round(first_minor_division -
99                 first_major_division * MinorTickSubdivision) - 1;
100
101         const int text_height = calculate_text_height();
102         const int ruler_height = RulerHeight * text_height;
103         const int major_tick_y1 = text_height + ValueMargin * 2;
104         const int minor_tick_y1 = (major_tick_y1 + ruler_height) / 2;
105
106         double x;
107
108         do {
109                 const double t = t0 + division * minor_tick_period;
110                 x = (t - view_.offset()) / view_.scale();
111
112                 if (division % MinorTickSubdivision == 0)
113                 {
114                         // Draw a major tick
115                         p.drawText(x, ValueMargin, 0, text_height,
116                                 AlignCenter | AlignTop | TextDontClip,
117                                 pv::util::format_time(t, prefix));
118                         p.drawLine(QPointF(x, major_tick_y1),
119                                 QPointF(x, ruler_height));
120                 }
121                 else
122                 {
123                         // Draw a minor tick
124                         p.drawLine(QPointF(x, minor_tick_y1),
125                                 QPointF(x, ruler_height));
126                 }
127
128                 division++;
129
130         } while (x < width());
131
132         // Draw the hover mark
133         draw_hover_mark(p, text_height);
134
135         // The cursor labels are not drawn with the arrows exactly on the
136         // bottom line of the widget, because then the selection shadow
137         // would be clipped away.
138         const QRect r = rect().adjusted(0, 0, 0, -ViewItem::HighlightRadius);
139
140         // Draw the items
141         const vector< shared_ptr<TimeItem> > items(view_.time_items());
142         for (auto &i : items) {
143                 const bool highlight = !dragging_ &&
144                         i->label_rect(r).contains(mouse_point_);
145                 i->paint_label(p, r, highlight);
146         }
147 }
148
149 void Ruler::mouseMoveEvent(QMouseEvent *e)
150 {
151         mouse_point_ = e->pos();
152
153         if (!(e->buttons() & Qt::LeftButton))
154                 return;
155
156         if ((e->pos() - mouse_down_point_).manhattanLength() <
157                 QApplication::startDragDistance())
158                 return;
159
160         // Do the drag
161         dragging_ = true;
162
163         const int delta = e->pos().x() - mouse_down_point_.x();
164         const vector< shared_ptr<TimeItem> > items(view_.time_items());
165         for (auto &i : items)
166                 if (i->dragging())
167                         i->set_time(view_.offset() +
168                                 (i->drag_point().x() + delta - 0.5) *
169                                 view_.scale());
170 }
171
172 void Ruler::mousePressEvent(QMouseEvent *e)
173 {
174         if (e->buttons() & Qt::LeftButton) {
175                 mouse_down_point_ = e->pos();
176
177                 mouse_down_item_.reset();
178
179                 clear_selection();
180
181                 const vector< shared_ptr<TimeItem> > items(view_.time_items());
182                 for (auto i = items.rbegin(); i != items.rend(); i++)
183                         if ((*i)->label_rect(rect()).contains(e->pos())) {
184                                 mouse_down_item_ = (*i);
185                                 break;
186                         }
187
188                 if (mouse_down_item_) {
189                         mouse_down_item_->select();
190                         mouse_down_item_->drag();
191                 }
192
193                 selection_changed();
194         }
195 }
196
197 void Ruler::mouseReleaseEvent(QMouseEvent *)
198 {
199         using pv::widgets::Popup;
200
201         if (!dragging_ && mouse_down_item_) {
202                 Popup *const p = mouse_down_item_->create_popup(&view_);
203                 if (p) {
204                         const QPoint arrpos(mouse_down_item_->get_x(),
205                                 height() - ViewItem::HighlightRadius);
206                         p->set_position(mapToGlobal(arrpos), Popup::Bottom);
207                         p->show();
208                 }
209         }
210
211         dragging_ = false;
212         mouse_down_item_.reset();
213
214         const vector< shared_ptr<TimeItem> > items(view_.time_items());
215         for (auto &i : items)
216                 i->drag_release();
217 }
218
219 void Ruler::leaveEvent(QEvent*)
220 {
221         mouse_point_ = QPoint(-1, -1);
222         update();
223 }
224
225 void Ruler::mouseDoubleClickEvent(QMouseEvent *e)
226 {
227         view_.add_flag(view_.offset() + ((double)e->x() + 0.5) * view_.scale());
228 }
229
230 void Ruler::keyPressEvent(QKeyEvent *e)
231 {
232         assert(e);
233
234         if (e->key() == Qt::Key_Delete)
235         {
236                 const vector< shared_ptr<TimeItem> > items(view_.time_items());
237                 for (auto &i : items)
238                         if (i->selected())
239                                 i->delete_pressed();
240         }
241 }
242
243 void Ruler::draw_hover_mark(QPainter &p, int text_height)
244 {
245         const int x = view_.hover_point().x();
246
247         if (x == -1)
248                 return;
249
250         p.setPen(QPen(Qt::NoPen));
251         p.setBrush(QBrush(palette().color(foregroundRole())));
252
253         const int b = RulerHeight * text_height;
254         const float hover_arrow_size = HoverArrowSize * text_height;
255         const QPointF points[] = {
256                 QPointF(x, b),
257                 QPointF(x - hover_arrow_size, b - hover_arrow_size),
258                 QPointF(x + hover_arrow_size, b - hover_arrow_size)
259         };
260         p.drawPolygon(points, countof(points));
261 }
262
263 int Ruler::calculate_text_height() const
264 {
265         return QFontMetrics(font()).ascent();
266 }
267
268 void Ruler::hover_point_changed()
269 {
270         update();
271 }
272
273 } // namespace view
274 } // namespace pv