From 18fdf9c03cb86180b00ed0308b1038b79cd011ee Mon Sep 17 00:00:00 2001
From: FarmRadio Hangar <johannes@isomorphic.co>
Date: Wed, 18 May 2016 15:08:11 +0300
Subject: [PATCH] animate Raised Button

---
 components/raisedbutton.cpp | 65 +++++++++++++++++++++++++++++++++----
 components/raisedbutton.h   |  3 ++
 2 files changed, 62 insertions(+), 6 deletions(-)

diff --git a/components/raisedbutton.cpp b/components/raisedbutton.cpp
index 6c40768..7fd3dce 100644
--- a/components/raisedbutton.cpp
+++ b/components/raisedbutton.cpp
@@ -1,6 +1,10 @@
 #include "raisedbutton.h"
 #include <QGraphicsDropShadowEffect>
 #include <QEventTransition>
+#include <QPropertyAnimation>
+#include <QPainter>
+#include <QStylePainter>
+#include <QStyleOption>
 #include "raisedbutton_p.h"
 
 void RaisedButtonPrivate::init()
@@ -9,37 +13,59 @@ void RaisedButtonPrivate::init()
 
     QGraphicsDropShadowEffect *effect = new QGraphicsDropShadowEffect;
     effect->setBlurRadius(7);
-    effect->setOffset(QPoint(0, 0));
+    effect->setOffset(QPointF(0, 0));
     effect->setColor(QColor(0, 0, 0, 100));
     q->setGraphicsEffect(effect);
 
-    q->setAutoFillBackground(true);
-
     QState *normalState = new QState;
     QState *pressedState = new QState;
 
     machine.addState(normalState);
     machine.addState(pressedState);
 
-    normalState->assignProperty(effect, "offset", QPoint(0, 0));
+    normalState->assignProperty(effect, "offset", QPointF(0, 0));
     normalState->assignProperty(effect, "blurRadius", 7);
 
-    pressedState->assignProperty(effect, "offset", QPoint(0, 6));
+    pressedState->assignProperty(effect, "offset", QPointF(0, 6));
     pressedState->assignProperty(effect, "blurRadius", 20);
 
     QAbstractTransition *transition;
+    QPropertyAnimation *animation;
+
+    //
 
     transition = new QEventTransition(q, QEvent::MouseButtonPress);
     transition->setTargetState(pressedState);
+
+    animation = new QPropertyAnimation(effect, "offset");
+    animation->setDuration(100);
+    transition->addAnimation(animation);
+    animation = new QPropertyAnimation(effect, "blurRadius");
+    animation->setDuration(100);
+    transition->addAnimation(animation);
+
     normalState->addTransition(transition);
 
+    //
+
     transition = new QEventTransition(q, QEvent::MouseButtonRelease);
     transition->setTargetState(normalState);
+
+    animation = new QPropertyAnimation(effect, "offset");
+    transition->addAnimation(animation);
+    animation->setDuration(100);
+    animation = new QPropertyAnimation(effect, "blurRadius");
+    animation->setDuration(100);
+    transition->addAnimation(animation);
+
     pressedState->addTransition(transition);
 
+    //
+
     machine.setInitialState(normalState);
 
-    // add animation.. duration: 100 !!!
+    QObject::connect(effect, SIGNAL(blurRadiusChanged(qreal)), q, SLOT(update()));
+    QObject::connect(effect, SIGNAL(offsetChanged(QPointF)), q, SLOT(update()));
 
     machine.start();
 }
@@ -55,3 +81,30 @@ RaisedButton::RaisedButton(QWidget *parent)
 RaisedButton::~RaisedButton()
 {
 }
+
+void RaisedButton::paintEvent(QPaintEvent *event)
+{
+    Q_UNUSED(event)
+
+    QPainter painter(this);
+
+    painter.setRenderHint(QPainter::Antialiasing);
+
+    QBrush brush;
+    brush.setStyle(Qt::SolidPattern);
+    brush.setColor(Qt::white);
+    painter.setBrush(brush);
+    painter.setPen(Qt::NoPen);
+
+    painter.drawRoundedRect(rect(), 3, 3);
+
+    QStylePainter style(this);
+
+    QStyleOptionButton option;
+    initStyleOption(&option);
+    option.features |= QStyleOptionButton::Flat;
+
+    style.drawControl(QStyle::CE_PushButtonLabel, option);
+
+    //FlatButton::paintEvent(event);
+}
diff --git a/components/raisedbutton.h b/components/raisedbutton.h
index d5d827e..3cd94b4 100644
--- a/components/raisedbutton.h
+++ b/components/raisedbutton.h
@@ -13,6 +13,9 @@ public:
     explicit RaisedButton(QWidget *parent = 0);
     ~RaisedButton();
 
+protected:
+    void paintEvent(QPaintEvent *event) Q_DECL_OVERRIDE;
+
 private:
     Q_DISABLE_COPY(RaisedButton)
     Q_DECLARE_PRIVATE(RaisedButton)