From f6c8b74ddd41542a741569a83c20ad9054ad23ef Mon Sep 17 00:00:00 2001
From: laserpants <johannes@isomorphic.co>
Date: Sat, 30 Apr 2016 13:44:45 +0300
Subject: [PATCH] mess around with slider thumb style

---
 components/slider.cpp | 19 ++++++++++++++++++-
 components/slider.h   | 19 ++++++++++++++-----
 2 files changed, 32 insertions(+), 6 deletions(-)

diff --git a/components/slider.cpp b/components/slider.cpp
index 9f4c094..87ace7d 100644
--- a/components/slider.cpp
+++ b/components/slider.cpp
@@ -1,12 +1,20 @@
 #include <QPainter>
 #include <QDebug>
 #include <QMouseEvent>
+#include <QPropertyAnimation>
 #include "slider.h"
 
 Handle::Handle(Slider *slider)
     : QWidget(slider),
-      _slider(slider)
+      _slider(slider),
+      _animation(new QPropertyAnimation(this)),
+      _scaleFactor(1)
 {
+    _animation->setPropertyName("scaleFactor");
+    _animation->setTargetObject(this);
+    _animation->setStartValue(1);
+    _animation->setEndValue(2);
+    _animation->setDuration(200);
 }
 
 Handle::~Handle()
@@ -51,6 +59,15 @@ void Handle::paintEvent(QPaintEvent *event)
 void Handle::mousePressEvent(QMouseEvent *event)
 {
     _offset = pos() - event->globalPos();
+
+    _animation->setDirection(QAbstractAnimation::Forward);
+    _animation->start();
+}
+
+void Handle::mouseReleaseEvent(QMouseEvent *event)
+{
+    _animation->setDirection(QAbstractAnimation::Backward);
+    _animation->start();
 }
 
 void Handle::mouseMoveEvent(QMouseEvent *event)
diff --git a/components/slider.h b/components/slider.h
index fcf48c5..7963167 100644
--- a/components/slider.h
+++ b/components/slider.h
@@ -4,17 +4,20 @@
 #include <QAbstractSlider>
 #include <QPoint>
 
+class QPropertyAnimation;
 class Slider;
 
 class Handle : public QWidget
 {
     Q_OBJECT
 
+    Q_PROPERTY(qreal scaleFactor WRITE setScaleFactor READ scaleFactor)
+
 public:
     explicit Handle(Slider *slider);
     ~Handle();
 
-    inline QSize sizeHint() const Q_DECL_OVERRIDE { return QSize(12, 12); }
+    inline QSize sizeHint() const Q_DECL_OVERRIDE { return QSize(12, 12)*_scaleFactor; }
 
     inline void setRelativePosition(const QPoint &pos) { setPosition(_offset + pos); }
 
@@ -24,18 +27,24 @@ public:
     inline void setOffset(const QPoint &offset) { _offset = offset; update(); }
     inline const QPoint &offset() const { return _offset; }
 
+    inline void setScaleFactor (qreal factor ) { _scaleFactor = factor; refreshGeometry(); }
+    inline qreal scaleFactor() const { return _scaleFactor; }
+
     void refreshGeometry();
 
 protected:
     void paintEvent(QPaintEvent *event) Q_DECL_OVERRIDE;
     void mousePressEvent(QMouseEvent *event) Q_DECL_OVERRIDE;
+    void mouseReleaseEvent(QMouseEvent *event) Q_DECL_OVERRIDE;
     void mouseMoveEvent(QMouseEvent *event) Q_DECL_OVERRIDE;
 
 private:
-    Slider *const _slider;
-    QPoint        _position;
-    QPoint        _eventPos;
-    QPoint        _offset;
+    Slider             *const _slider;
+    QPropertyAnimation *const _animation;
+    QPoint                    _position;
+    QPoint                    _eventPos;
+    QPoint                    _offset;
+    qreal                     _scaleFactor;
 };
 
 class Slider : public QAbstractSlider