use state transitions for blur/unblur of the toolbar

1 files changed, 37 insertions, 12 deletions

diff --git a/graphicstoolbar.cpp b/graphicstoolbar.cpp
index 51860e4..6c6e6ab 100644
--- a/graphicstoolbar.cpp
+++ b/graphicstoolbar.cpp
@@ -5,6 +5,9 @@
 #include <QGraphicsTransform>
 #include <QPropertyAnimation>
 #include <QParallelAnimationGroup>
+#include <QState>
+#include <QEventTransition>
+#include <QGraphicsSceneHoverEvent>
 #include "graphicstoolbar.h"
 
 GraphicsToolBar::GraphicsToolBar(QGraphicsScene *scene, QGraphicsItem * parent, Qt::WindowFlags wFlags)
@@ -44,6 +47,38 @@ GraphicsToolBar::GraphicsToolBar(QGraphicsScene *scene, QGraphicsItem * parent,
     QList<QGraphicsTransform *> txs;
     txs << m_rotation;
     setTransformations(txs);
+
+    QState *blurredState = new QState;
+    QState *normalState = new QState;
+    m_stateMachine.addState(blurredState);
+    m_stateMachine.addState(normalState);
+    m_stateMachine.setInitialState(normalState);
+    QEventTransition *makeBlurred = new QEventTransition(this, QEvent::GraphicsSceneHoverLeave, normalState);
+    makeBlurred->setTargetState(blurredState);
+    QEventTransition *makeNormal = new QEventTransition(this, QEvent::GraphicsSceneHoverEnter, blurredState);
+    makeNormal->setTargetState(normalState);
+
+    QParallelAnimationGroup *makeBlurAnimation = new QParallelAnimationGroup(this);
+    QParallelAnimationGroup *makeNormalAnimation = new QParallelAnimationGroup(this);
+
+    QPropertyAnimation *blurAnimation = new QPropertyAnimation(m_blurEffect, "blurRadius", makeBlurAnimation);
+    blurAnimation->setEndValue(5);
+    QPropertyAnimation *transparentizeAnimation = new QPropertyAnimation(this, "opacity", makeBlurAnimation);
+    transparentizeAnimation->setEndValue(0.7);
+    makeBlurAnimation->addAnimation(blurAnimation);
+    makeBlurAnimation->addAnimation(transparentizeAnimation);
+
+    QPropertyAnimation *unblurAnimation = new QPropertyAnimation(m_blurEffect, "blurRadius", makeNormalAnimation);
+    unblurAnimation->setEndValue(0);
+    QPropertyAnimation *untransparentizeAnimation = new QPropertyAnimation(this, "opacity", makeBlurAnimation);
+    untransparentizeAnimation->setEndValue(1.0);
+    makeNormalAnimation->addAnimation(unblurAnimation);
+    makeNormalAnimation->addAnimation(untransparentizeAnimation);
+
+    makeBlurred->addAnimation(makeBlurAnimation);
+    makeNormal->addAnimation(makeNormalAnimation);
+
+    m_stateMachine.start();
 }
 
 void GraphicsToolBar::setGraphicsEffectsEnabled(bool enabled) {
@@ -100,18 +135,6 @@ void GraphicsToolBar::paint(QPainter *painter, const QStyleOptionGraphicsItem *o
     painter->restore();
 }
 
-void GraphicsToolBar::hoverEnterEvent(QGraphicsSceneHoverEvent* event) {
-    Q_UNUSED(event);
-    transitionBlurEnabledTo(false);
-    update();
-}
-
-void GraphicsToolBar::hoverLeaveEvent(QGraphicsSceneHoverEvent* event) {
-    Q_UNUSED(event);
-    transitionBlurEnabledTo(true);
-    update();
-}
-
 void GraphicsToolBar::transitionBlurEnabledTo(bool enabled) {
     if (! graphicsEffectsEnabled())
         return;
@@ -130,6 +153,8 @@ void GraphicsToolBar::transitionBlurEnabledTo(bool enabled) {
 
 void GraphicsToolBar::show() {
     QGraphicsWidget::show();
+    setOpacity(1.0);
+    m_blurEffect->setProperty("blurRadius", 0);
 }
 
 void GraphicsToolBar::hide() {