package greenfoot.gui.input.mouse;

import java.awt.event.MouseEvent;




| This class resolves the priorities of mouse events for the MousePollingManager.
|
|
| Priorities with highest priority first::
| <ul>
| <li> dragEnd </li>
| <li> click </li>
| <li> press </li>
| <li> drag </li>
| <li> move </li>
| </ul>
|
| If several of the same type of event happens, then the last one is used.
|
| If two buttons are pressed at the same time, the behaviour is
| undefined. Maybe we should define it so that button1 always have higher
| priority than button2 and button2 always higher than button3. But not
| necessarily documenting this to the user.
|
| @author Poul Henriksen
|
public class PriorityManager
{       



| Returns true if the new mouse event has higher or equal priority than the current.
| @param newEvent The AWT mouse event code
| @param currentData The existing mouse data to compare against
| @return True if the new event is higher priority
|
public static boolean isHigherPriority(int newEvent, MouseEventData currentData)
   {
      int currentPriority = getPriority(currentData);
      int newPriority = getPriority(newEvent);
       
      return newPriority <= currentPriority;     
      }
   
   


| Priority 0 is highest.
| @param event The AWT event code for the mouse event
| @return The mapped priority, to enable a comparison.
|
private static int getPriority(int event)
   {
      if (event == MouseEvent.MOUSE_RELEASED) {            
         return 0;         
         }

      else if (event == MouseEvent.MOUSE_CLICKED) {            
         return 1;         
         }

      else if (event == MouseEvent.MOUSE_PRESSED) {            
         return 2;         
         }

      else if (event == MouseEvent.MOUSE_DRAGGED) {            
         return 3;         
         }

      else if (event == MouseEvent.MOUSE_MOVED) {            
         return 4;         
         }
       

      else {
           
      return Integer.MAX_VALUE;         
      }     
   }

   
private static int getPriority(MouseEventData data)
   {
   if (data.isMouseDragEnded()) {            
      return 0;         
      }

   else if (data.isMouseClicked()) {            
      return 1;         
      }

   else if (data.isMousePressed()) {            
      return 2;         
      }

   else if (data.isMouseDragged()) {            
      return 3;         
      }

   else if (data.isMouseMoved()) {            
      return 4;         
      }
       

   else {
           
   return Integer.MAX_VALUE;         
   }     
} 
}