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Serenity Operating System
1/*
2 * Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
3 * Copyright (c) 2019-2020, William McPherson <willmcpherson2@gmail.com>
4 * All rights reserved.
5 *
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions are met:
8 *
9 * 1. Redistributions of source code must retain the above copyright notice, this
10 * list of conditions and the following disclaimer.
11 *
12 * 2. Redistributions in binary form must reproduce the above copyright notice,
13 * this list of conditions and the following disclaimer in the documentation
14 * and/or other materials provided with the distribution.
15 *
16 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
17 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
19 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
22 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
23 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
24 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
25 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
26 */
27
28#include "MainWidget.h"
29#include "AudioEngine.h"
30#include "KeysWidget.h"
31#include "KnobsWidget.h"
32#include "RollWidget.h"
33#include "SamplerWidget.h"
34#include "WaveWidget.h"
35#include <LibGUI/BoxLayout.h>
36#include <LibGUI/TabWidget.h>
37
38MainWidget::MainWidget(AudioEngine& audio_engine)
39 : m_audio_engine(audio_engine)
40{
41 set_layout<GUI::VerticalBoxLayout>();
42 layout()->set_spacing(2);
43 layout()->set_margins({ 2, 2, 2, 2 });
44 set_fill_with_background_color(true);
45
46 m_wave_widget = add<WaveWidget>(audio_engine);
47 m_wave_widget->set_size_policy(GUI::SizePolicy::Fill, GUI::SizePolicy::Fixed);
48 m_wave_widget->set_preferred_size(0, 100);
49
50 m_tab_widget = add<GUI::TabWidget>();
51 m_roll_widget = m_tab_widget->add_tab<RollWidget>("Piano Roll", audio_engine);
52
53 m_roll_widget->set_size_policy(GUI::SizePolicy::Fill, GUI::SizePolicy::Fill);
54 m_roll_widget->set_preferred_size(0, 300);
55
56 m_tab_widget->add_tab<SamplerWidget>("Sampler", audio_engine);
57
58 m_keys_and_knobs_container = add<GUI::Widget>();
59 m_keys_and_knobs_container->set_layout<GUI::HorizontalBoxLayout>();
60 m_keys_and_knobs_container->layout()->set_spacing(2);
61 m_keys_and_knobs_container->set_size_policy(GUI::SizePolicy::Fill, GUI::SizePolicy::Fixed);
62 m_keys_and_knobs_container->set_preferred_size(0, 100);
63 m_keys_and_knobs_container->set_fill_with_background_color(true);
64
65 m_keys_widget = m_keys_and_knobs_container->add<KeysWidget>(audio_engine);
66
67 m_knobs_widget = m_keys_and_knobs_container->add<KnobsWidget>(audio_engine, *this);
68 m_knobs_widget->set_size_policy(GUI::SizePolicy::Fixed, GUI::SizePolicy::Fill);
69 m_knobs_widget->set_preferred_size(350, 0);
70}
71
72MainWidget::~MainWidget()
73{
74}
75
76// FIXME: There are some unnecessary calls to update() throughout this program,
77// which are an easy target for optimization.
78
79void MainWidget::custom_event(Core::CustomEvent&)
80{
81 m_wave_widget->update();
82 m_roll_widget->update();
83}
84
85void MainWidget::keydown_event(GUI::KeyEvent& event)
86{
87 // This is to stop held-down keys from creating multiple events.
88 if (m_keys_pressed[event.key()])
89 return;
90 else
91 m_keys_pressed[event.key()] = true;
92
93 note_key_action(event.key(), On);
94 special_key_action(event.key());
95 m_keys_widget->update();
96}
97
98void MainWidget::keyup_event(GUI::KeyEvent& event)
99{
100 m_keys_pressed[event.key()] = false;
101
102 note_key_action(event.key(), Off);
103 m_keys_widget->update();
104}
105
106void MainWidget::note_key_action(int key_code, Switch switch_note)
107{
108 int key = m_keys_widget->key_code_to_key(key_code);
109 m_keys_widget->set_key(key, switch_note);
110}
111
112void MainWidget::special_key_action(int key_code)
113{
114 switch (key_code) {
115 case Key_Z:
116 set_octave_and_ensure_note_change(Down);
117 break;
118 case Key_X:
119 set_octave_and_ensure_note_change(Up);
120 break;
121 case Key_C:
122 m_audio_engine.set_wave(Up);
123 m_knobs_widget->update_knobs();
124 break;
125 }
126}
127
128void MainWidget::set_octave_and_ensure_note_change(Direction direction)
129{
130 m_keys_widget->set_key(m_keys_widget->mouse_note(), Off);
131 for (int i = 0; i < key_code_count; ++i) {
132 if (m_keys_pressed[i])
133 note_key_action(i, Off);
134 }
135
136 m_audio_engine.set_octave(direction);
137
138 m_keys_widget->set_key(m_keys_widget->mouse_note(), On);
139 for (int i = 0; i < key_code_count; ++i) {
140 if (m_keys_pressed[i])
141 note_key_action(i, On);
142 }
143
144 m_knobs_widget->update_knobs();
145 m_keys_widget->update();
146}