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[pulseview.git] / pv / view / cursorheader.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 "cursorheader.hpp"
22
23 #include "ruler.hpp"
24 #include "view.hpp"
25
26 #include <QApplication>
27 #include <QFontMetrics>
28 #include <QMouseEvent>
29
30 #include <pv/widgets/popup.hpp>
31
32 using std::shared_ptr;
33 using std::vector;
34
35 namespace pv {
36 namespace view {
37
38 const int CursorHeader::Padding = 20;
39 const int CursorHeader::BaselineOffset = 5;
40
41 int CursorHeader::calculateTextHeight()
42 {
43         QFontMetrics fm(font());
44         return fm.boundingRect(0, 0, INT_MAX, INT_MAX,
45                 Qt::AlignLeft | Qt::AlignTop, "8").height();
46 }
47
48 CursorHeader::CursorHeader(View &parent) :
49         MarginWidget(parent),
50         textHeight_(calculateTextHeight())
51 {
52         setMouseTracking(true);
53 }
54
55 QSize CursorHeader::sizeHint() const
56 {
57         return QSize(0, textHeight_ + Padding + BaselineOffset);
58 }
59
60 void CursorHeader::clear_selection()
61 {
62         const vector< shared_ptr<TimeItem> > items(view_.time_items());
63         for (auto &i : items)
64                 i->select(false);
65         update();
66 }
67
68 void CursorHeader::paintEvent(QPaintEvent*)
69 {
70         QPainter p(this);
71         p.setRenderHint(QPainter::Antialiasing);
72
73         // The cursor labels are not drawn with the arrows exactly on the
74         // bottom line of the widget, because then the selection shadow
75         // would be clipped away.
76         const QRect r = rect().adjusted(0, 0, 0, -BaselineOffset);
77
78         // Draw the items
79         const vector< shared_ptr<TimeItem> > items(view_.time_items());
80         for (auto &m : items)
81                 m->paint_label(p, r);
82 }
83
84 void CursorHeader::mouseMoveEvent(QMouseEvent *e)
85 {
86         mouse_point_ = e->pos();
87
88         if (!(e->buttons() & Qt::LeftButton))
89                 return;
90
91         if ((e->pos() - mouse_down_point_).manhattanLength() <
92                 QApplication::startDragDistance())
93                 return;
94
95         // Do the drag
96         dragging_ = true;
97
98         const int delta = e->pos().x() - mouse_down_point_.x();
99         const vector< shared_ptr<TimeItem> > items(view_.time_items());
100         for (auto &i : items)
101                 if (i->dragging())
102                         i->set_time(view_.offset() +
103                                 (i->drag_point().x() + delta - 0.5) *
104                                 view_.scale());
105 }
106
107 void CursorHeader::mousePressEvent(QMouseEvent *e)
108 {
109         if (e->buttons() & Qt::LeftButton) {
110                 mouse_down_point_ = e->pos();
111
112                 mouse_down_item_.reset();
113
114                 clear_selection();
115
116                 const vector< shared_ptr<TimeItem> > items(view_.time_items());
117                 for (auto &i : items)
118                         if (i && i->label_rect(rect()).contains(e->pos())) {
119                                 mouse_down_item_ = i;
120                                 break;
121                         }
122
123                 if (mouse_down_item_) {
124                         mouse_down_item_->select();
125                         mouse_down_item_->drag();
126                 }
127
128                 selection_changed();
129         }
130 }
131
132 void CursorHeader::mouseReleaseEvent(QMouseEvent *)
133 {
134         using pv::widgets::Popup;
135
136         if (!dragging_ && mouse_down_item_) {
137                 Popup *const p = mouse_down_item_->create_popup(&view_);
138                 if (p) {
139                         const QPoint arrpos(mouse_down_item_->get_x(),
140                                 height() - BaselineOffset);
141                         p->set_position(mapToGlobal(arrpos), Popup::Bottom);
142                         p->show();
143                 }
144         }
145
146         dragging_ = false;
147         mouse_down_item_.reset();
148
149         const vector< shared_ptr<TimeItem> > items(view_.time_items());
150         for (auto &i : items)
151                 i->drag_release();
152 }
153
154 void CursorHeader::leaveEvent(QEvent*)
155 {
156         mouse_point_ = QPoint(-1, -1);
157         update();
158 }
159
160 void CursorHeader::mouseDoubleClickEvent(QMouseEvent *e)
161 {
162         view_.add_flag(view_.offset() + ((double)e->x() + 0.5) * view_.scale());
163 }
164
165 } // namespace view
166 } // namespace pv