package greenfoot.guifx.classes;

import bluej.utility.javafx.FXPlatformConsumer;

import java.util.ArrayList;
import java.util.HashSet;
import java.util.List;
import java.util.Set;




| A class for handling a single-selection across a set of ClassDisplay items.
|
public class ClassDisplaySelectionManager
{       
private final Set<ClassDisplay> classDisplayList = new HashSet<>();
   
   private final List<FXPlatformConsumer<ClassDisplay>> selectionListeners = new ArrayList<>();
   
   private ClassDisplay selected = null;

   
   public ClassDisplaySelectionManager()
   {     
   }

   



| Add a ClassDisplay to the set of possibly-selected classes
|
public void addClassDisplay(ClassDisplay classDisplay)
   {
   classDisplayList.add(classDisplay);     
   }
    
   



| Remove a ClassDisplay from the set of possibly-selected classes
|
public void removeClassDisplay(ClassDisplay classDisplay)
   {
   classDisplayList.remove(classDisplay);     
   }

   



| Select the given item.  The setSelected method of all classes will
| be called with the relevant true/false state.
|
public void select(ClassDisplay target)
   {
   target.setSelected(true);
       
   selected = target;
       
   for (ClassDisplay display : classDisplayList)
       {
      if (!display.equals(target))
           {
         display.setSelected(false);             
         }         
      }
       
   for (FXPlatformConsumer<ClassDisplay> selectionListener : selectionListeners)
       {
      selectionListener.accept(target);         
      }     
   }

   



| Gets the currently selected ClassDisplay.  May be null.
|
public ClassDisplay getSelected()
   {        
   return selected;     
   }

   



| Adds a selection listener to be called back when the selection changes.
| Note: it is possible that null may be passed as the current selection.
|
public void addSelectionListener(FXPlatformConsumer<ClassDisplay> listener)
   {
   selectionListeners.add(listener);     
   } 
}