Initial commit.

src/equalizer/equalizer.cpp

@@ -0,0 +1,349 @@
+/*
+ * Strawberry Music Player
+ * This file was part of Clementine.
+ * Copyright 2010, David Sansome <me@davidsansome.com>
+ *
+ * Strawberry is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * Strawberry 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 General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with Strawberry.  If not, see <http://www.gnu.org/licenses/>.
+ * 
+ */
+
+#include "config.h"
+
+#include "equalizer.h"
+#include "ui_equalizer.h"
+
+#include <QInputDialog>
+#include <QMessageBox>
+#include <QSettings>
+#include <QShortcut>
+#include <QtDebug>
+
+#include "core/iconloader.h"
+#include "core/logging.h"
+#include "equalizerslider.h"
+
+const char *Equalizer::kGainText[] = { "60", "170", "310", "600", "1k", "3k", "6k", "12k", "14k", "16k" };
+
+const char *Equalizer::kSettingsGroup = "Equalizer";
+
+Equalizer::Equalizer(QWidget *parent)
+    : QDialog(parent), ui_(new Ui_Equalizer), loading_(false) {
+
+  //qLog(Debug) << __PRETTY_FUNCTION__;
+
+  ui_->setupUi(this);
+
+  // Icons
+  ui_->preset_del->setIcon(IconLoader::Load("list-remove"));
+  ui_->preset_save->setIcon(IconLoader::Load("document-save"));
+
+  preamp_ = AddSlider(tr("Pre-amp"));
+
+  QFrame* line = new QFrame(ui_->slider_container);
+  line->setFrameShape(QFrame::VLine);
+  line->setFrameShadow(QFrame::Sunken);
+  ui_->slider_container->layout()->addWidget(line);
+
+  for (int i = 0; i < kBands; ++i) gain_[i] = AddSlider(kGainText[i]);
+
+  // Must be done before the signals are connected
+  ReloadSettings();
+
+  connect(ui_->enable, SIGNAL(toggled(bool)), SIGNAL(EnabledChanged(bool)));
+  connect(ui_->enable, SIGNAL(toggled(bool)), ui_->slider_container, SLOT(setEnabled(bool)));
+  connect(ui_->enable, SIGNAL(toggled(bool)), SLOT(Save()));
+  connect(ui_->preset, SIGNAL(currentIndexChanged(int)), SLOT(PresetChanged(int)));
+  connect(ui_->preset_save, SIGNAL(clicked()), SLOT(SavePreset()));
+  connect(ui_->preset_del, SIGNAL(clicked()), SLOT(DelPreset()));
+  connect(ui_->balance_slider, SIGNAL(valueChanged(int)), SLOT(StereoSliderChanged(int)));
+
+  QShortcut* close = new QShortcut(QKeySequence::Close, this);
+  connect(close, SIGNAL(activated()), SLOT(close()));
+
+}
+
+Equalizer::~Equalizer() {
+  delete ui_;
+}
+
+void Equalizer::ReloadSettings() {
+    
+  //qLog(Debug) << __PRETTY_FUNCTION__;
+
+  QSettings s;
+  s.beginGroup(kSettingsGroup);
+
+  presets_.clear();
+  ui_->preset->clear();
+
+  // Load presets
+  int count = s.beginReadArray("presets");
+  for (int i = 0; i < count; ++i) {
+    s.setArrayIndex(i);
+    AddPreset(s.value("name").toString(), s.value("params").value<Equalizer::Params>());
+  }
+  s.endArray();
+
+  if (count == 0) LoadDefaultPresets();
+
+  // Selected preset
+  QString selected_preset = s.value("selected_preset", "Custom").toString();
+  QString selected_preset_display_name = QString(tr(qPrintable(selected_preset)));
+  int selected_index = ui_->preset->findText(selected_preset_display_name);
+  if (selected_index != -1) ui_->preset->setCurrentIndex(selected_index);
+
+  // Enabled?
+  ui_->enable->setChecked(s.value("enabled", false).toBool());
+  ui_->slider_container->setEnabled(ui_->enable->isChecked());
+
+  int stereo_balance = s.value("stereo_balance", 0).toInt();
+  ui_->balance_slider->setValue(stereo_balance);
+  StereoSliderChanged(stereo_balance);
+
+  PresetChanged(selected_preset);
+
+}
+
+void Equalizer::LoadDefaultPresets() {
+    
+  //qLog(Debug) << __PRETTY_FUNCTION__;
+
+  AddPreset(QT_TRANSLATE_NOOP("Equalizer", "Custom"),             Params(0, 0, 0, 0, 0, 0, 0, 0, 0, 0));
+  AddPreset(QT_TRANSLATE_NOOP("Equalizer", "Classical"),          Params(0, 0, 0, 0, 0, 0, -40, -40, -40, -50));
+  AddPreset(QT_TRANSLATE_NOOP("Equalizer", "Club"),               Params(0, 0, 20, 30, 30, 30, 20, 0, 0, 0));
+  AddPreset(QT_TRANSLATE_NOOP("Equalizer", "Dance"),              Params(50, 35, 10, 0, 0, -30, -40, -40, 0, 0));
+  AddPreset(QT_TRANSLATE_NOOP("Equalizer", "Full Bass"),          Params(70, 70, 70, 40, 20, -45, -50, -55, -55, -55));
+  AddPreset(QT_TRANSLATE_NOOP("Equalizer", "Full Treble"),        Params(-50, -50, -50, -25, 15, 55, 80, 80, 80, 85));
+  AddPreset(QT_TRANSLATE_NOOP("Equalizer", "Full Bass + Treble"), Params(35, 30, 0, -40, -25, 10, 45, 55, 60, 60));
+  AddPreset(QT_TRANSLATE_NOOP("Equalizer", "Laptop/Headphones"),  Params(25, 50, 25, -20, 0, -30, -40, -40, 0, 0));
+  AddPreset(QT_TRANSLATE_NOOP("Equalizer", "Large Hall"),         Params(50, 50, 30, 30, 0, -25, -25, -25, 0, 0));
+  AddPreset(QT_TRANSLATE_NOOP("Equalizer", "Live"),               Params(-25, 0, 20, 25, 30, 30, 20, 15, 15, 10));
+  AddPreset(QT_TRANSLATE_NOOP("Equalizer", "Party"),              Params(35, 35, 0, 0, 0, 0, 0, 0, 35, 35));
+  AddPreset(QT_TRANSLATE_NOOP("Equalizer", "Pop"),                Params(-10, 25, 35, 40, 25, -5, -15, -15, -10, -10));
+  AddPreset(QT_TRANSLATE_NOOP("Equalizer", "Reggae"),             Params(0, 0, -5, -30, 0, -35, -35, 0, 0, 0));
+  AddPreset(QT_TRANSLATE_NOOP("Equalizer", "Rock"),               Params(40, 25, -30, -40, -20, 20, 45, 55, 55, 55));
+  AddPreset(QT_TRANSLATE_NOOP("Equalizer", "Soft"),               Params(25, 10, -5, -15, -5, 20, 45, 50, 55, 60));
+  AddPreset(QT_TRANSLATE_NOOP("Equalizer", "Ska"),                Params(-15, -25, -25, -5, 20, 30, 45, 50, 55, 50));
+  AddPreset(QT_TRANSLATE_NOOP("Equalizer", "Soft Rock"),          Params(20, 20, 10, -5, -25, -30, -20, -5, 15, 45));
+  AddPreset(QT_TRANSLATE_NOOP("Equalizer", "Techno"),             Params(40, 30, 0, -30, -25, 0, 40, 50, 50, 45));
+  AddPreset(QT_TRANSLATE_NOOP("Equalizer", "Zero"),               Params(0, 0, 0, 0, 0, 0, 0, 0, 0, 0));
+
+}
+
+void Equalizer::AddPreset(const QString& name, const Params& params) {
+
+  QString name_displayed = tr(qPrintable(name));
+  presets_[name] = params;
+
+  if (ui_->preset->findText(name_displayed) == -1) {
+    ui_->preset->addItem(name_displayed,  // name to display (translated)
+    QVariant(name)   // original name
+                         );
+  }
+}
+
+void Equalizer::PresetChanged(int index) {
+
+  PresetChanged(ui_->preset->itemData(index).toString());
+}
+
+void Equalizer::PresetChanged(const QString& name) {
+
+  if (presets_.contains(last_preset_)) {
+    if (presets_[last_preset_] != current_params()) {
+      SaveCurrentPreset();
+    }
+  }
+  last_preset_ = name;
+
+  Params& p = presets_[name];
+
+  loading_ = true;
+  preamp_->set_value(p.preamp);
+  for (int i = 0; i < kBands; ++i) gain_[i]->set_value(p.gain[i]);
+  loading_ = false;
+
+  ParametersChanged();
+  Save();
+
+}
+
+void Equalizer::SavePreset() {
+
+  QString name = SaveCurrentPreset();
+  if (!name.isEmpty()) {
+    last_preset_ = name;
+    ui_->preset->setCurrentIndex(ui_->preset->findText(tr(qPrintable(name))));
+  }
+
+}
+
+QString Equalizer::SaveCurrentPreset() {
+
+  QString name = QInputDialog::getText(this, tr("Save preset"), tr("Name"), QLineEdit::Normal, tr(qPrintable(last_preset_)));;
+  if (name.isEmpty())
+    return QString();
+
+  AddPreset(name, current_params());
+  Save();
+  return name;
+
+}
+
+void Equalizer::DelPreset() {
+
+  QString name = ui_->preset->itemData(ui_->preset->currentIndex()).toString();
+  QString name_displayed = ui_->preset->currentText();
+  if (!presets_.contains(name) || name.isEmpty()) return;
+
+  int ret = QMessageBox::question(
+      this, tr("Delete preset"),
+      tr("Are you sure you want to delete the \"%1\" preset?").arg(name_displayed),
+      QMessageBox::Yes, QMessageBox::No);
+
+  if (ret == QMessageBox::No) return;
+
+  presets_.remove(name);
+  ui_->preset->removeItem(ui_->preset->currentIndex());
+  Save();
+
+}
+
+EqualizerSlider* Equalizer::AddSlider(const QString &label) {
+
+  EqualizerSlider* ret = new EqualizerSlider(label, ui_->slider_container);
+  ui_->slider_container->layout()->addWidget(ret);
+  connect(ret, SIGNAL(ValueChanged(int)), SLOT(ParametersChanged()));
+
+  return ret;
+
+}
+
+bool Equalizer::is_enabled() const {
+  return ui_->enable->isChecked();
+}
+
+int Equalizer::preamp_value() const {
+  return preamp_->value();
+}
+
+QList<int> Equalizer::gain_values() const {
+  QList<int> ret;
+  for (int i = 0; i < kBands; ++i) {
+    ret << gain_[i]->value();
+  }
+  return ret;
+}
+
+Equalizer::Params Equalizer::current_params() const {
+
+  QList<int> gains = gain_values();
+
+  Params ret;
+  ret.preamp = preamp_value();
+  std::copy(gains.begin(), gains.end(), ret.gain);
+  return ret;
+
+}
+
+float Equalizer::stereo_balance() const {
+  return qBound(-1.0f, ui_->balance_slider->value() / 100.0f, 1.0f);
+}
+
+void Equalizer::ParametersChanged() {
+  if (loading_) return;
+
+  emit ParametersChanged(preamp_value(), gain_values());
+}
+
+void Equalizer::Save() {
+
+  QSettings s;
+  s.beginGroup(kSettingsGroup);
+
+  // Presets
+  s.beginWriteArray("presets", presets_.count());
+  int i = 0;
+  for (const QString& name : presets_.keys()) {
+    s.setArrayIndex(i++);
+    s.setValue("name", name);
+    s.setValue("params", QVariant::fromValue(presets_[name]));
+  }
+  s.endArray();
+
+  // Selected preset
+  s.setValue("selected_preset", ui_->preset->itemData(ui_->preset->currentIndex()).toString());
+
+  // Enabled?
+  s.setValue("enabled", ui_->enable->isChecked());
+
+  s.setValue("stereo_balance", ui_->balance_slider->value());
+
+}
+
+void Equalizer::closeEvent(QCloseEvent* e) {
+  QString name = ui_->preset->currentText();
+  if (!presets_.contains(name)) return;
+
+  if (presets_[name] == current_params()) return;
+
+  SavePreset();
+}
+
+Equalizer::Params::Params() : preamp(0) {
+  for (int i = 0; i < Equalizer::kBands; ++i) gain[i] = 0;
+}
+
+Equalizer::Params::Params(int g0, int g1, int g2, int g3, int g4, int g5, int g6, int g7, int g8, int g9, int pre)
+    : preamp(pre) {
+  gain[0] = g0;
+  gain[1] = g1;
+  gain[2] = g2;
+  gain[3] = g3;
+  gain[4] = g4;
+  gain[5] = g5;
+  gain[6] = g6;
+  gain[7] = g7;
+  gain[8] = g8;
+  gain[9] = g9;
+}
+
+bool Equalizer::Params::operator ==(const Equalizer::Params& other) const {
+  if (preamp != other.preamp) return false;
+  for (int i = 0; i < Equalizer::kBands; ++i) {
+    if (gain[i] != other.gain[i]) return false;
+  }
+  return true;
+}
+
+bool Equalizer::Params::operator !=(const Equalizer::Params& other) const {
+  return ! (*this == other);
+}
+
+void Equalizer::StereoSliderChanged(int value) {
+  emit StereoBalanceChanged(stereo_balance());
+  Save();
+}
+
+QDataStream &operator<<(QDataStream& s, const Equalizer::Params& p) {
+  s << p.preamp;
+  for (int i = 0; i < Equalizer::kBands; ++i) s << p.gain[i];
+  return s;
+}
+
+QDataStream &operator>>(QDataStream& s, Equalizer::Params& p) {
+  s >> p.preamp;
+  for (int i = 0; i < Equalizer::kBands; ++i) s >> p.gain[i];
+  return s;
+}

src/equalizer/equalizer.h

@@ -0,0 +1,101 @@
+/*
+ * Strawberry Music Player
+ * This file was part of Clementine.
+ * Copyright 2010, David Sansome <me@davidsansome.com>
+ *
+ * Strawberry is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * Strawberry 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 General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with Strawberry.  If not, see <http://www.gnu.org/licenses/>.
+ * 
+ */
+
+#ifndef EQUALIZER_H
+#define EQUALIZER_H
+
+#include "config.h"
+
+#include <QDialog>
+#include <QMetaType>
+#include <QMap>
+
+class EqualizerSlider;
+class Ui_Equalizer;
+
+class Equalizer : public QDialog {
+  Q_OBJECT
+
+ public:
+  Equalizer(QWidget* parent = nullptr);
+  ~Equalizer();
+
+  static const int kBands = 10;
+  static const char *kGainText[kBands];
+  static const char *kSettingsGroup;
+
+  struct Params {
+    Params();
+    Params(int g0, int g1, int g2, int g3, int g4, int g5, int g6, int g7, int g8, int g9, int pre = 0);
+
+    bool operator ==(const Params &other) const;
+    bool operator !=(const Params &other) const;
+
+    int preamp;
+    int gain[kBands];
+  };
+
+  bool is_enabled() const;
+  int preamp_value() const;
+  QList<int> gain_values() const;
+  Params current_params() const;
+  float stereo_balance() const;
+
+ signals:
+  void EnabledChanged(bool enabled);
+  void ParametersChanged(int preamp, const QList<int> &band_gains);
+  void StereoBalanceChanged(float balance);
+
+ protected:
+  void closeEvent(QCloseEvent *);
+
+ private slots:
+  void ParametersChanged();
+  void PresetChanged(const QString &name);
+  void PresetChanged(int index);
+  void SavePreset();
+  void DelPreset();
+  void Save();
+  void StereoSliderChanged(int value);
+
+ private:
+  EqualizerSlider *AddSlider(const QString &label);
+  void LoadDefaultPresets();
+  void AddPreset(const QString &name, const Params &params);
+  void ReloadSettings();
+  QString SaveCurrentPreset();
+
+ private:
+  Ui_Equalizer *ui_;
+  bool loading_;
+
+  QString last_preset_;
+
+  EqualizerSlider *preamp_;
+  EqualizerSlider *gain_[kBands];
+
+  QMap<QString, Params> presets_;
+};
+Q_DECLARE_METATYPE(Equalizer::Params);
+
+QDataStream &operator<<(QDataStream &s, const Equalizer::Params &p);
+QDataStream &operator>>(QDataStream &s, Equalizer::Params &p);
+
+#endif  // EQUALIZER_H

src/equalizer/equalizer.ui

@@ -0,0 +1,163 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<ui version="4.0">
+ <class>Equalizer</class>
+ <widget class="QDialog" name="Equalizer">
+  <property name="geometry">
+   <rect>
+    <x>0</x>
+    <y>0</y>
+    <width>435</width>
+    <height>265</height>
+   </rect>
+  </property>
+  <property name="windowTitle">
+   <string>Equalizer</string>
+  </property>
+  <property name="windowIcon">
+   <iconset resource="../../data/data.qrc">
+    <normaloff>:/icons/64x64/strawberry.png</normaloff>:/icons/64x64/strawberry.png</iconset>
+  </property>
+  <layout class="QVBoxLayout" name="verticalLayout">
+   <item>
+    <layout class="QHBoxLayout" name="horizontalLayout">
+     <item>
+      <widget class="QLabel" name="label">
+       <property name="text">
+        <string>Preset:</string>
+       </property>
+      </widget>
+     </item>
+     <item>
+      <widget class="QComboBox" name="preset">
+       <property name="sizePolicy">
+        <sizepolicy hsizetype="Expanding" vsizetype="Fixed">
+         <horstretch>0</horstretch>
+         <verstretch>0</verstretch>
+        </sizepolicy>
+       </property>
+      </widget>
+     </item>
+     <item>
+      <widget class="QToolButton" name="preset_save">
+       <property name="toolTip">
+        <string>Save preset</string>
+       </property>
+      </widget>
+     </item>
+     <item>
+      <widget class="QToolButton" name="preset_del">
+       <property name="toolTip">
+        <string>Delete preset</string>
+       </property>
+      </widget>
+     </item>
+    </layout>
+   </item>
+   <item>
+    <widget class="Line" name="line">
+     <property name="orientation">
+      <enum>Qt::Horizontal</enum>
+     </property>
+    </widget>
+   </item>
+   <item>
+    <widget class="QCheckBox" name="enable">
+     <property name="text">
+      <string>Enable equalizer</string>
+     </property>
+    </widget>
+   </item>
+   <item>
+    <widget class="QWidget" name="slider_container" native="true">
+     <property name="enabled">
+      <bool>false</bool>
+     </property>
+     <property name="sizePolicy">
+      <sizepolicy hsizetype="Preferred" vsizetype="Expanding">
+       <horstretch>0</horstretch>
+       <verstretch>0</verstretch>
+      </sizepolicy>
+     </property>
+     <layout class="QHBoxLayout" name="horizontalLayout_2"/>
+    </widget>
+   </item>
+   <item>
+    <layout class="QHBoxLayout" name="slider_label_layout">
+     <item>
+      <widget class="QLabel">
+       <property name="text">
+        <string>Left</string>
+       </property>
+       <property name="alignment">
+        <enum>Qt::AlignLeft | Qt::AlignBottom</enum>
+       </property>
+       <property name="font">
+        <font>
+         <pointsize>11</pointsize>
+        </font>
+       </property>
+      </widget>
+     </item>
+     <item>
+      <widget class="QLabel">
+       <property name="text">
+        <string>Balance</string>
+       </property>
+       <property name="alignment">
+        <enum>Qt::AlignCenter</enum>
+       </property>
+      </widget>
+     </item>
+     <item>
+      <widget class="QLabel">
+       <property name="text">
+        <string>Right</string>
+       </property>
+       <property name="alignment">
+        <enum>Qt::AlignRight | Qt::AlignBottom</enum>
+       </property>
+       <property name="font">
+        <font>
+         <pointsize>11</pointsize>
+        </font>
+       </property>
+      </widget>
+     </item>
+    </layout>
+   </item>
+   <item>
+    <widget class="QSlider" name="balance_slider">
+     <property name="maximum">
+      <number>100</number>
+     </property>
+     <property name="minimum">
+      <number>-100</number>
+     </property>
+     <property name="orientation">
+      <enum>Qt::Horizontal</enum>
+     </property>
+     <property name="tickPosition">
+      <enum>QSlider::TicksBelow</enum>
+     </property>
+     <property name="tickInterval">
+      <number>10</number>
+     </property>
+     <property name="singleStep">
+      <number>10</number>
+     </property>
+     <property name="pageStep">
+      <number>100</number>
+     </property>
+    </widget>
+   </item>
+  </layout>
+ </widget>
+ <tabstops>
+  <tabstop>preset</tabstop>
+  <tabstop>preset_save</tabstop>
+ </tabstops>
+ <resources>
+  <include location="../../data/data.qrc"/>
+ </resources>
+ <connections/>
+</ui>

src/equalizer/equalizerslider.cpp

@@ -0,0 +1,47 @@
+/*
+ * Strawberry Music Player
+ * This file was part of Clementine.
+ * Copyright 2010, David Sansome <me@davidsansome.com>
+ *
+ * Strawberry is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * Strawberry 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 General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with Strawberry.  If not, see <http://www.gnu.org/licenses/>.
+ * 
+ */
+
+#include "config.h"
+
+#include "equalizerslider.h"
+#include "ui_equalizerslider.h"
+
+EqualizerSlider::EqualizerSlider(const QString &label, QWidget *parent)
+  : QWidget(parent),
+    ui_(new Ui_EqualizerSlider)
+{
+  ui_->setupUi(this);
+  ui_->label->setText(label);
+
+  connect(ui_->slider, SIGNAL(valueChanged(int)), SIGNAL(ValueChanged(int)));
+}
+
+EqualizerSlider::~EqualizerSlider() {
+  delete ui_;
+}
+
+int EqualizerSlider::value() const {
+  return ui_->slider->value();
+}
+
+void EqualizerSlider::set_value(int value) {
+  ui_->slider->setValue(value);
+}
+

src/equalizer/equalizerslider.h

@@ -0,0 +1,50 @@
+/*
+ * Strawberry Music Player
+ * This file was part of Clementine.
+ * Copyright 2010, David Sansome <me@davidsansome.com>
+ *
+ * Strawberry is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * Strawberry 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 General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with Strawberry.  If not, see <http://www.gnu.org/licenses/>.
+ * 
+ */
+
+#ifndef EQUALISERSLIDER_H
+#define EQUALISERSLIDER_H
+
+#include "config.h"
+
+#include <QWidget>
+
+class Ui_EqualizerSlider;
+
+// Contains the slider and the label
+class EqualizerSlider : public QWidget {
+
+  Q_OBJECT
+
+ public:
+  EqualizerSlider(const QString &label, QWidget *parent = nullptr);
+  ~EqualizerSlider();
+
+  int value() const;
+  void set_value(int value);
+
+ signals:
+  void ValueChanged(int value);
+
+ private:
+  Ui_EqualizerSlider *ui_;
+
+};
+
+#endif  // EQUALISERSLIDER_H

src/equalizer/equalizerslider.ui

@@ -0,0 +1,93 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<ui version="4.0">
+ <class>EqualizerSlider</class>
+ <widget class="QWidget" name="EqualizerSlider">
+  <property name="geometry">
+   <rect>
+    <x>0</x>
+    <y>0</y>
+    <width>33</width>
+    <height>224</height>
+   </rect>
+  </property>
+  <property name="minimumSize">
+   <size>
+    <width>0</width>
+    <height>100</height>
+   </size>
+  </property>
+  <property name="windowTitle">
+   <string>Form</string>
+  </property>
+  <layout class="QVBoxLayout" name="verticalLayout">
+   <property name="margin">
+    <number>0</number>
+   </property>
+   <item>
+    <layout class="QHBoxLayout" name="horizontalLayout">
+     <item>
+      <spacer name="horizontalSpacer">
+       <property name="orientation">
+        <enum>Qt::Horizontal</enum>
+       </property>
+       <property name="sizeHint" stdset="0">
+        <size>
+         <width>0</width>
+         <height>0</height>
+        </size>
+       </property>
+      </spacer>
+     </item>
+     <item>
+      <widget class="StickySlider" name="slider">
+       <property name="minimum">
+        <number>-100</number>
+       </property>
+       <property name="maximum">
+        <number>100</number>
+       </property>
+       <property name="orientation">
+        <enum>Qt::Vertical</enum>
+       </property>
+       <property name="sticky_center" stdset="0">
+        <number>0</number>
+       </property>
+       <property name="sticky_threshold" stdset="0">
+        <number>10</number>
+       </property>
+      </widget>
+     </item>
+     <item>
+      <spacer name="horizontalSpacer_2">
+       <property name="orientation">
+        <enum>Qt::Horizontal</enum>
+       </property>
+       <property name="sizeHint" stdset="0">
+        <size>
+         <width>0</width>
+         <height>0</height>
+        </size>
+       </property>
+      </spacer>
+     </item>
+    </layout>
+   </item>
+   <item>
+    <widget class="QLabel" name="label">
+     <property name="alignment">
+      <set>Qt::AlignCenter</set>
+     </property>
+    </widget>
+   </item>
+  </layout>
+ </widget>
+ <customwidgets>
+  <customwidget>
+   <class>StickySlider</class>
+   <extends>QSlider</extends>
+   <header>widgets/stickyslider.h</header>
+  </customwidget>
+ </customwidgets>
+ <resources/>
+ <connections/>
+</ui>