Move cancel button back into progressbar

I made it hide the cancel button this time and
added a nice animation when hovered.

src/plugins/coreplugin/progressmanager/progressbar.h

@@ -38,6 +38,9 @@
 class ProgressBar : public QWidget
 {
     Q_OBJECT
+
+    Q_PROPERTY(float fader READ fader WRITE setFader)
+
 public:
     ProgressBar(QWidget *parent = 0);
     ~ProgressBar();
@@ -50,13 +53,16 @@ public:
     QSize sizeHint() const;
     void paintEvent(QPaintEvent *);
     void mouseMoveEvent(QMouseEvent *);
-
     int minimum() const { return m_minimum; }
     int maximum() const { return m_maximum; }
     int value() const { return m_value; }
     void reset();
     void setRange(int minimum, int maximum);
     void setValue(int value);
+    float fader() { return m_fader; }
+    void setFader(float value) { m_fader = value; update(); }
+    bool event(QEvent *);
+
 signals:
     void clicked();
 
@@ -69,10 +75,11 @@ private:
     QString m_title;
     bool m_error;
     int m_progressHeight;
-
     int m_minimum;
     int m_maximum;
     int m_value;
+    float m_fader;
+
 };
 
 #endif // PROGRESSPIE_H