summaryrefslogtreecommitdiff
path: root/dggui/slider.cc
blob: 15a82b38bcb8199f46d9fdfb9e6e4101ec0739ff (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/***************************************************************************
 *            slider.cc
 *
 *  Sat Nov 26 18:10:22 CET 2011
 *  Copyright 2011 Bent Bisballe Nyeng
 *  deva@aasimon.org
 ****************************************************************************/

/*
 *  This file is part of DrumGizmo.
 *
 *  DrumGizmo is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU Lesser General Public License as published by
 *  the Free Software Foundation; either version 3 of the License, or
 *  (at your option) any later version.
 *
 *  DrumGizmo is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU Lesser General Public License for more details.
 *
 *  You should have received a copy of the GNU Lesser General Public License
 *  along with DrumGizmo; if not, write to the Free Software
 *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA.
 */
#include "slider.h"

#include "painter.h"

#include <hugin.hpp>
#include <stdio.h>

namespace GUI
{

Slider::Slider(Widget* parent) : Widget(parent)
{
	state = State::up;

	current_value = 0.0;
	maximum = 1.0;
	minimum = 0.0;
}

void Slider::setValue(float new_value)
{
	current_value = new_value;
	if (current_value < 0.)
	{
		current_value = 0.;
	}
	else if (current_value > 1.0) {
		current_value = 1.0;
	}

	redraw();
	clickNotifier();
	valueChangedNotifier(current_value);
}

float Slider::value() const
{
	return current_value;
}

void Slider::setColour(Colour colour)
{
	switch (colour) {
	case Colour::Green:
		active_inner_bar = &inner_bar_green;
		break;
	case Colour::Red:
		active_inner_bar = &inner_bar_red;
		break;
	case Colour::Blue:
		active_inner_bar = &inner_bar_blue;
		break;
	case Colour::Yellow:
		active_inner_bar = &inner_bar_yellow;
		break;
	case Colour::Purple:
		active_inner_bar = &inner_bar_purple;
		break;
	case Colour::Grey:
		active_inner_bar = &inner_bar_grey;
		break;
	}

	if (enabled) { inner_bar = active_inner_bar; }
}

void Slider::setEnabled(bool enabled)
{
	this->enabled = enabled;

	if (enabled) {
		inner_bar = active_inner_bar;
	}
	else {
		active_inner_bar = inner_bar;
		inner_bar = &inner_bar_light_grey;
	}

	redraw();
}

void Slider::repaintEvent(RepaintEvent* repaintEvent)
{
	Painter p(*this);

	auto inner_offset = (current_value / maximum) * getControlWidth();
	auto button_x = button_offset + inner_offset - (button.width() / 2);
	auto button_y = (height() - button.height()) / 2;

	// draw bar
	bar.setSize(width(), height());
	p.drawImage(0, 0, bar);

	// draw inner bar
	inner_bar->setSize(button_x - bar_boundary, height() - 2 * bar_boundary);
	p.drawImage(bar_boundary, bar_boundary, *inner_bar);

	// draw button
	p.drawImage(button_x, button_y, button);
}

void Slider::buttonEvent(ButtonEvent* buttonEvent)
{
	// Ignore everything except left clicks.
	if(!enabled || buttonEvent->button != MouseButton::left)
	{
		return;
	}

	if(buttonEvent->direction == Direction::down)
	{
		state = State::down;
		recomputeCurrentValue(buttonEvent->x);

		redraw();
		clickNotifier();
		valueChangedNotifier(current_value);
	}

	if(buttonEvent->direction == Direction::up)
	{
		state = State::up;
		recomputeCurrentValue(buttonEvent->x);

		redraw();
		clickNotifier();
		valueChangedNotifier(current_value);
	}
}

void Slider::mouseMoveEvent(MouseMoveEvent* mouseMoveEvent)
{
	if(state == State::down)
	{
		recomputeCurrentValue(mouseMoveEvent->x);

		redraw();
		clickNotifier();
		valueChangedNotifier(current_value);
	}
}

void Slider::scrollEvent(ScrollEvent* scrollEvent)
{
	if (!enabled) { return; }

	current_value -= scrollEvent->delta/(float)getControlWidth();
	if (current_value < 0.)
	{
		current_value = 0.;
	}
	else if (current_value > 1.0) {
		current_value = 1.0;
	}

	redraw();
	clickNotifier();
	valueChangedNotifier(current_value);
}

std::size_t Slider::getControlWidth() const
{
	if(width() < 2 * button_offset)
	{
		return 0;
	}

	return width() - 2 * button_offset;
}

void Slider::recomputeCurrentValue(float x)
{
	if(x < button_offset)
	{
		current_value = 0;
	}
	else
	{
		current_value = (x - button_offset) / getControlWidth();
	}

	if (current_value < 0.)
	{
		current_value = 0.;
	}
	else if (current_value > 1.0) {
		current_value = 1.0;
	}
}

} // GUI::