[prmr#508] Added notification spawning and rearranging methods

src/org/jetuml/gui/NotificationHandler.java

@@ -10,6 +10,10 @@
 public final class NotificationHandler
 {
 
+    private static final int NOTIFICATION_STACK_SPACING = 8;
+    private static final int NOTIFICATION_STACK_X_MARGIN = 18;
+    private static final int NOTIFICATION_STACK_Y_MARGIN = 18;
+
     /**
      * A callback for Notification objects called when they reached the end of their lifetime.
      * It removes them from the handler notification list.
@@ -22,6 +26,7 @@ private CleanUpCallback()
 
         /**
          * Removes the specified notification object from the handler notification list.
+         *
          * @param pNotification The notification object that calls this function
          */
         public void execute(Notification pNotification)
@@ -50,11 +55,55 @@ public static NotificationHandler instance()
 
     /**
      * Sets the parent stage of all the notification stages.
+     *
      * @param pStage The target parent stage of the notification objects
      */
     public void setMainStage(Stage pStage)
     {
         this.aMainStage = pStage;
     }
 
+    /**
+     * Rearranges the notifications so that they are stacked properly and do not overlap.
+     */
+    public void updatePosition()
+    {
+
+        double yBuf = this.aMainStage.getY() + this.aMainStage.getHeight() - NOTIFICATION_STACK_Y_MARGIN;
+        double x = this.aMainStage.getX() + NOTIFICATION_STACK_X_MARGIN;
+
+        for (int i = aNotificationList.size() - 1; i >= 0; i--)
+        {
+            Notification notification = aNotificationList.get(i);
+            notification.setX(x);
+            notification.setY(yBuf);
+            yBuf = yBuf - notification.getHeight() - NOTIFICATION_STACK_SPACING;
+        }
+    }
+
+    /**
+     * Spawns a new toast notification.
+     *
+     * @param pText The text to show on the toast
+     */
+    public void spawn(String pText)
+    {
+
+        if (this.aMainStage == null)
+        {
+            return;
+        }
+
+        double x = this.aMainStage.getX() + NOTIFICATION_STACK_X_MARGIN;
+        double y = this.aMainStage.getY() + this.aMainStage.getHeight() - NOTIFICATION_STACK_Y_MARGIN;
+
+        ToastNotification toast = new ToastNotification(pText, this.aMainStage);
+
+        aNotificationList.add(toast);
+
+        toast.show(x, y, new CleanUpCallback());
+        this.updatePosition();
+
+    }
+
 }