View: Update ruler after restoring session
[pulseview.git] / pv / views / trace / viewport.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, see <http://www.gnu.org/licenses/>.
18  */
19
20 #include <algorithm>
21 #include <cassert>
22 #include <cmath>
23 #include <limits>
24
25 #include "signal.hpp"
26 #include "view.hpp"
27 #include "viewitempaintparams.hpp"
28 #include "viewport.hpp"
29
30 #include <pv/session.hpp>
31
32 #include <QMouseEvent>
33
34 #include <QDebug>
35
36 using std::abs;
37 using std::back_inserter;
38 using std::copy;
39 using std::dynamic_pointer_cast;
40 using std::none_of; // NOLINT. Used in assert()s.
41 using std::shared_ptr;
42 using std::stable_sort;
43 using std::vector;
44
45 namespace pv {
46 namespace views {
47 namespace trace {
48
49 Viewport::Viewport(View &parent) :
50         ViewWidget(parent),
51         pinch_zoom_active_(false)
52 {
53         setAutoFillBackground(true);
54         setBackgroundRole(QPalette::Base);
55 }
56
57 shared_ptr<ViewItem> Viewport::get_mouse_over_item(const QPoint &pt)
58 {
59         const ViewItemPaintParams pp(rect(), view_.scale(), view_.offset());
60         const vector< shared_ptr<ViewItem> > items(this->items());
61         for (auto i = items.rbegin(); i != items.rend(); i++)
62                 if ((*i)->enabled() && (*i)->hit_box_rect(pp).contains(pt))
63                         return *i;
64         return nullptr;
65 }
66
67 void Viewport::item_hover(const shared_ptr<ViewItem> &item)
68 {
69         if (item && item->is_draggable())
70                 setCursor(dynamic_pointer_cast<RowItem>(item) ?
71                         Qt::SizeVerCursor : Qt::SizeHorCursor);
72         else
73                 unsetCursor();
74 }
75
76 void Viewport::drag()
77 {
78         drag_offset_ = view_.offset();
79         drag_v_offset_ = view_.owner_visual_v_offset();
80 }
81
82 void Viewport::drag_by(const QPoint &delta)
83 {
84         if (drag_offset_ == boost::none)
85                 return;
86
87         view_.set_scale_offset(view_.scale(),
88                 (*drag_offset_ - delta.x() * view_.scale()));
89
90         view_.set_v_offset(-drag_v_offset_ - delta.y());
91 }
92
93 void Viewport::drag_release()
94 {
95         drag_offset_ = boost::none;
96 }
97
98 vector< shared_ptr<ViewItem> > Viewport::items()
99 {
100         vector< shared_ptr<ViewItem> > items;
101         const vector< shared_ptr<ViewItem> > view_items(
102                 view_.list_by_type<ViewItem>());
103         copy(view_items.begin(), view_items.end(), back_inserter(items));
104         const vector< shared_ptr<TimeItem> > time_items(view_.time_items());
105         copy(time_items.begin(), time_items.end(), back_inserter(items));
106         return items;
107 }
108
109 bool Viewport::touch_event(QTouchEvent *event)
110 {
111         QList<QTouchEvent::TouchPoint> touchPoints = event->touchPoints();
112
113         if (touchPoints.count() != 2) {
114                 pinch_zoom_active_ = false;
115                 return false;
116         }
117
118         const QTouchEvent::TouchPoint &touchPoint0 = touchPoints.first();
119         const QTouchEvent::TouchPoint &touchPoint1 = touchPoints.last();
120
121         if (!pinch_zoom_active_ ||
122             (event->touchPointStates() & Qt::TouchPointPressed)) {
123                 pinch_offset0_ = (view_.offset() + view_.scale() * touchPoint0.pos().x()).convert_to<double>();
124                 pinch_offset1_ = (view_.offset() + view_.scale() * touchPoint1.pos().x()).convert_to<double>();
125                 pinch_zoom_active_ = true;
126         }
127
128         double w = touchPoint1.pos().x() - touchPoint0.pos().x();
129         if (abs(w) >= 1.0) {
130                 const double scale =
131                         fabs((pinch_offset1_ - pinch_offset0_) / w);
132                 double offset = pinch_offset0_ - touchPoint0.pos().x() * scale;
133                 if (scale > 0)
134                         view_.set_scale_offset(scale, offset);
135         }
136
137         if (event->touchPointStates() & Qt::TouchPointReleased) {
138                 pinch_zoom_active_ = false;
139
140                 if (touchPoint0.state() & Qt::TouchPointReleased) {
141                         // Primary touch released
142                         drag_release();
143                 } else {
144                         // Update the mouse down fields so that continued
145                         // dragging with the primary touch will work correctly
146                         mouse_down_point_ = touchPoint0.pos().toPoint();
147                         drag();
148                 }
149         }
150
151         return true;
152 }
153
154 void Viewport::paintEvent(QPaintEvent*)
155 {
156         typedef void (ViewItem::*LayerPaintFunc)(
157                 QPainter &p, ViewItemPaintParams &pp);
158         LayerPaintFunc layer_paint_funcs[] = {
159                 &ViewItem::paint_back, &ViewItem::paint_mid,
160                 &ViewItem::paint_fore, nullptr};
161
162         vector< shared_ptr<RowItem> > row_items(view_.list_by_type<RowItem>());
163         assert(none_of(row_items.begin(), row_items.end(),
164                 [](const shared_ptr<RowItem> &r) { return !r; }));
165
166         stable_sort(row_items.begin(), row_items.end(),
167                 [](const shared_ptr<RowItem> &a, const shared_ptr<RowItem> &b) {
168                         return a->drag_point(QRect()).y() < b->drag_point(QRect()).y(); });
169
170         const vector< shared_ptr<TimeItem> > time_items(view_.time_items());
171         assert(none_of(time_items.begin(), time_items.end(),
172                 [](const shared_ptr<TimeItem> &t) { return !t; }));
173
174         QPainter p(this);
175         p.setRenderHint(QPainter::Antialiasing);
176
177         for (LayerPaintFunc *paint_func = layer_paint_funcs;
178                         *paint_func; paint_func++) {
179                 ViewItemPaintParams time_pp(rect(), view_.scale(), view_.offset());
180                 for (const shared_ptr<TimeItem> t : time_items)
181                         (t.get()->*(*paint_func))(p, time_pp);
182
183                 ViewItemPaintParams row_pp(rect(), view_.scale(), view_.offset());
184                 for (const shared_ptr<RowItem> r : row_items)
185                         (r.get()->*(*paint_func))(p, row_pp);
186         }
187
188         p.end();
189 }
190
191 void Viewport::mouseDoubleClickEvent(QMouseEvent *event)
192 {
193         assert(event);
194
195         if (event->buttons() & Qt::LeftButton)
196                 view_.zoom(2.0, event->x());
197         else if (event->buttons() & Qt::RightButton)
198                 view_.zoom(-2.0, event->x());
199 }
200
201 void Viewport::wheelEvent(QWheelEvent *event)
202 {
203         assert(event);
204
205         if (event->orientation() == Qt::Vertical) {
206                 if (event->modifiers() & Qt::ControlModifier) {
207                         // Vertical scrolling with the control key pressed
208                         // is intrepretted as vertical scrolling
209                         view_.set_v_offset(-view_.owner_visual_v_offset() -
210                                 (event->delta() * height()) / (8 * 120));
211                 } else {
212                         // Vertical scrolling is interpreted as zooming in/out
213                         view_.zoom(event->delta() / 120.0, event->x());
214                 }
215         } else if (event->orientation() == Qt::Horizontal) {
216                 // Horizontal scrolling is interpreted as moving left/right
217                 view_.set_scale_offset(view_.scale(),
218                         event->delta() * view_.scale() + view_.offset());
219         }
220 }
221
222 } // namespace trace
223 } // namespace views
224 } // namespace pv