Animate slider value changes

Author: ThePBone

V4L_Frontend.pro

@@ -55,6 +55,7 @@ SOURCES += \
     dialog/logdlg.cpp \
     dialog/palettedlg.cpp \
     dialog/presetdlg.cpp \
+    dialog/qanimatedslider.cpp \
     dialog/qmessageoverlay.cpp \
     dialog/settingsdlg.cpp \
     dialog/statusfragment.cpp \
@@ -101,6 +102,7 @@ HEADERS += \
     dialog/logdlg.h \
     dialog/palettedlg.h \
     dialog/presetdlg.h \
+    dialog/qanimatedslider.h \
     dialog/qmessageoverlay.h \
     dialog/settingsdlg.h \
     dialog/statusfragment.h \

dialog/liquidequalizerwidget.cpp

@@ -25,6 +25,9 @@ using namespace std;
 LiquidEqualizerWidget::LiquidEqualizerWidget(QWidget *parent)
     : QWidget(parent)
 {
+    for (int i = 0; i < BANDS_NUM;i++) {
+        anim[i] = new QVariantAnimation(this);
+    }
     connect(this,&LiquidEqualizerWidget::redrawRequired,[this](){
         repaint();
     });
@@ -243,19 +246,20 @@ void LiquidEqualizerWidget::setBand(int i, float value, bool animate, bool manua
     mSelectedBand = i;
     mManual = manual;
     if(animate){
-        QVariantAnimation* anim = new QVariantAnimation(this);
-        anim->setDuration(mAnimationDuration);
-        anim->setEasingCurve(QEasingCurve(QEasingCurve::Type::InOutCirc));
-        anim->setStartValue(value);
-        anim->setEndValue(mLevels[i]);
-        anim->setDirection(QVariantAnimation::Backward);
-
-        connect(anim,QOverload<const QVariant &>::of(&QVariantAnimation::valueChanged),[this,i](const QVariant& v){
+        anim[i]->stop();
+        anim[i] = new QVariantAnimation(this);
+        anim[i]->setDuration(500);
+        anim[i]->setEasingCurve(QEasingCurve(QEasingCurve::Type::InOutCirc));
+        anim[i]->setStartValue(mLevels[i]);
+        anim[i]->setEndValue(value);
+        anim[i]->setDirection(QVariantAnimation::Direction::Forward);
+
+        connect(anim[i],QOverload<const QVariant &>::of(&QVariantAnimation::valueChanged),[this,i](const QVariant& v){
             mLevels[i] = v.toFloat();
             repaint();
         });
 
-        anim->start();
+        anim[i]->start();
 
     }
     else{

dialog/liquidequalizerwidget.h

@@ -69,6 +69,8 @@ class LiquidEqualizerWidget : public QWidget
     void keyReleaseEvent(QKeyEvent *event) override;
     void mouseDoubleClickEvent(QMouseEvent *event) override;
 private:
+    QVariantAnimation* anim[BANDS_NUM];
+
     QPainter mGridLines;
     QPainter mControlBarText;
     QPainter mFrequencyResponseBg;

dialog/qanimatedslider.cpp

@@ -0,0 +1,80 @@
+#include "qanimatedslider.h"
+/*
+ *  MIT License
+
+    Copyright (c) 2020 Tim Schneeberger (ThePBone) <tim.schneeberger(at)outlook.de>
+
+    Permission is hereby granted, free of charge, to any person obtaining a copy
+    of this software and associated documentation files (the "Software"), to deal
+    in the Software without restriction, including without limitation the rights
+    to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+    copies of the Software, and to permit persons to whom the Software is
+    furnished to do so, subject to the following conditions:
+
+    The above copyright notice and this permission notice shall be included in all
+    copies or substantial portions of the Software.
+
+    THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+    IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+    FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+    AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+    LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+    OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+    SOFTWARE.
+ *
+ */
+
+QAnimatedSlider::QAnimatedSlider(QWidget *parent)
+    : QSlider(parent)
+{
+    anim = new QPropertyAnimation(this,"value");
+    connect(this,&QSlider::valueChanged,[this]{
+        cValue = value();
+    });
+}
+
+QAnimatedSlider::~QAnimatedSlider()
+{
+}
+
+void QAnimatedSlider::setValueA(int val, bool animate)
+{
+    cValue = val;
+    if(animate){
+        anim->stop();
+        anim->setDuration(mDuration);
+        anim->setEasingCurve(mEasingCurve);
+        anim->setStartValue(QSlider::value());
+        anim->setEndValue(val);
+        anim->start();
+    }
+    else
+        QSlider::setValue(val);
+}
+
+int QAnimatedSlider::valueA() const
+{
+    return cValue;
+}
+
+QEasingCurve QAnimatedSlider::easingCurve() const
+{
+    return mEasingCurve;
+}
+
+void QAnimatedSlider::setEasingCurve(const QEasingCurve &easingCurve)
+{
+    mEasingCurve = easingCurve;
+}
+
+int QAnimatedSlider::duration() const
+{
+    return mDuration;
+}
+
+void QAnimatedSlider::setDuration(int duration)
+{
+    mDuration = duration;
+}
+
+

dialog/qanimatedslider.h

@@ -0,0 +1,78 @@
+/*
+ *  MIT License
+
+    Copyright (c) 2020 Tim Schneeberger (ThePBone) <tim.schneeberger(at)outlook.de>
+
+    Permission is hereby granted, free of charge, to any person obtaining a copy
+    of this software and associated documentation files (the "Software"), to deal
+    in the Software without restriction, including without limitation the rights
+    to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+    copies of the Software, and to permit persons to whom the Software is
+    furnished to do so, subject to the following conditions:
+
+    The above copyright notice and this permission notice shall be included in all
+    copies or substantial portions of the Software.
+
+    THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+    IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+    FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+    AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+    LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+    OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+    SOFTWARE.
+ *
+ */
+#ifndef QANIMATEDSLIDER_H
+#define QANIMATEDSLIDER_H
+
+#include <QSlider>
+#include <QPropertyAnimation>
+
+/*!
+    \class QAnimatedSlider
+
+    \brief The QAnimatedSlider class provides an extended slider widget with animation capabilities.
+*/
+class QAnimatedSlider : public QSlider
+{
+    Q_OBJECT
+
+public:
+    QAnimatedSlider(QWidget *parent = nullptr);
+    ~QAnimatedSlider();
+    /*!
+        \brief Updates the current stored value and animates this change if \c animate is \c true.
+    */
+    void setValueA(int value, bool animate = true);
+    /*!
+        \brief Current value of the underlying slider widget
+    */
+    int valueA() const;
+
+    /*!
+        \brief Returns the currently set easing curve used for the animation
+    */
+    QEasingCurve easingCurve() const;
+    /*!
+        \brief Set a custom easing curve used for the animation.\n
+               By default, the \c QEasingCurve::InOutCirc curve is used.
+    */
+    void setEasingCurve(const QEasingCurve &easingCurve);
+
+    /*!
+        \brief Returns the currently set animation duration
+    */
+    int duration() const;
+    /*!
+        \brief Set a custom animation duration.\n
+               By default, this value is set to 300ms.
+    */
+    void setDuration(int duration);
+
+private:
+    QVariantAnimation* anim;
+    int cValue = 0;
+    int mDuration = 300;
+    QEasingCurve mEasingCurve = QEasingCurve(QEasingCurve::Type::InOutCirc);
+};
+#endif // QANIMATEDSLIDER_H