CompositionWidget example: use QBasicTimer instead of raw timer IDs

Change-Id: I011645d915193c9ab1e3f001898c88fdd48e64a0
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>

examples/widgets/painting/composition/composition.cpp

@@ -10,7 +10,9 @@
 #include <QMouseEvent>
 #include <qmath.h>
 
-const int animationInterval = 15; // update every 16 ms = ~60FPS
+using namespace std::chrono_literals;
+
+const auto animationInterval = 15ms; // update every 16 ms = ~60FPS
 
 CompositionWidget::CompositionWidget(QWidget *parent)
     : QWidget(parent)
@@ -189,7 +191,7 @@ CompositionRenderer::CompositionRenderer(QWidget *parent)
     : ArthurFrame(parent)
 {
     m_animation_enabled = true;
-    m_animationTimer = startTimer(animationInterval);
+    m_animationTimer.start(animationInterval, this);
     m_image = QImage(":res/composition/flower.jpg");
     m_image.setAlphaChannel(QImage(":res/composition/flower_alpha.jpg"));
     m_circle_alpha = 127;
@@ -219,11 +221,10 @@ void CompositionRenderer::setAnimationEnabled(bool enabled)
         return;
     m_animation_enabled = enabled;
     if (enabled) {
-        Q_ASSERT(!m_animationTimer);
-        m_animationTimer = startTimer(animationInterval);
+        Q_ASSERT(!m_animationTimer.isActive());
+        m_animationTimer.start(animationInterval, this);
     } else {
-        killTimer(m_animationTimer);
-        m_animationTimer = 0;
+        m_animationTimer.stop();
     }
 }
 
@@ -326,8 +327,7 @@ void CompositionRenderer::mousePressEvent(QMouseEvent *e)
         m_current_object = NoObject;
     }
     if (m_animation_enabled) {
-        killTimer(m_animationTimer);
-        m_animationTimer = 0;
+        m_animationTimer.stop();
     }
 }
 
@@ -342,14 +342,14 @@ void CompositionRenderer::mouseReleaseEvent(QMouseEvent *)
     m_current_object = NoObject;
 
     if (m_animation_enabled) {
-        Q_ASSERT(!m_animationTimer);
-        m_animationTimer = startTimer(animationInterval);
+        Q_ASSERT(!m_animationTimer.isActive());
+        m_animationTimer.start(animationInterval, this);
     }
 }
 
 void CompositionRenderer::timerEvent(QTimerEvent *event)
 {
-    if (event->timerId() == m_animationTimer)
+    if (event->matches(m_animationTimer))
         updateCirclePos();
 }
 

examples/widgets/painting/composition/composition.h

@@ -6,6 +6,7 @@
 
 #include "arthurwidgets.h"
 
+#include <QBasicTimer>
 #include <QPainter>
 #include <QEvent>
 
@@ -137,7 +138,7 @@ public slots:
 
     ObjectType m_current_object;
     bool m_animation_enabled;
-    int m_animationTimer;
+    QBasicTimer m_animationTimer;
 };
 
 #endif // COMPOSITION_H