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+#ifndef QPROGRESSINDICATOR_H_
+#define QPROGRESSINDICATOR_H_
+
+#include <QWidget>
+#include <QColor>
+
+/*!
+    \class QProgressIndicator
+    \brief The QProgressIndicator class lets an application display a progress
+   indicator to show that a lengthy task is under way.
+
+    Progress indicators are indeterminate and do nothing more than spin to show
+   that the application is busy.
+    \sa QProgressBar
+ */
+class QProgressIndicator : public QWidget {
+  Q_OBJECT
+  Q_PROPERTY(int delay READ animationDelay WRITE setAnimationDelay)
+  Q_PROPERTY(bool displayedWhenStopped READ isDisplayedWhenStopped WRITE
+                 setDisplayedWhenStopped)
+  Q_PROPERTY(QColor color READ color WRITE setColor)
+
+ public:
+  QProgressIndicator(QWidget *parent = 0);
+
+  /*! Returns the delay between animation steps.
+      \return The number of milliseconds between animation steps. By default,
+     the animation delay is set to 40 milliseconds.
+      \sa setAnimationDelay
+   */
+  int animationDelay() const { return m_delay; }
+
+  /*! Returns a Boolean value indicating whether the component is currently
+     animated.
+      \return Animation state.
+      \sa startAnimation stopAnimation
+   */
+  bool isAnimated() const;
+
+  /*! Returns a Boolean value indicating whether the receiver shows itself even
+     when it is not animating.
+      \return Return true if the progress indicator shows itself even when it is
+     not animating. By default, it returns false.
+      \sa setDisplayedWhenStopped
+   */
+  bool isDisplayedWhenStopped() const;
+
+  /*! Returns the color of the component.
+      \sa setColor
+   */
+  const QColor &color() const { return m_color; }
+
+  virtual QSize sizeHint() const;
+  int heightForWidth(int w) const;
+
+ public slots:
+  /*! Starts the spin animation.
+      \sa stopAnimation isAnimated
+   */
+  void startAnimation();
+
+  /*! Stops the spin animation.
+      \sa startAnimation isAnimated
+   */
+  void stopAnimation();
+
+  /*! Sets the delay between animation steps.
+      Setting the \a delay to a value larger than 40 slows the animation, while
+     setting the \a delay to a smaller value speeds it up.
+      \param delay The delay, in milliseconds.
+      \sa animationDelay
+   */
+  void setAnimationDelay(int delay);
+
+  /*! Sets whether the component hides itself when it is not animating.
+     \param state The animation state. Set false to hide the progress indicator
+     when it is not animating; otherwise true.
+     \sa isDisplayedWhenStopped
+   */
+  void setDisplayedWhenStopped(bool state);
+
+  /*! Sets the color of the components to the given color.
+      \sa color
+   */
+  void setColor(const QColor &color);
+
+ protected:
+  virtual void timerEvent(QTimerEvent *event);
+  virtual void paintEvent(QPaintEvent *event);
+
+ private:
+  int m_angle;
+  int m_timerId;
+  int m_delay;
+  bool m_displayedWhenStopped;
+  QColor m_color;
+};
+
+#endif  // QPROGRESSINDICATOR_H_