package greenfoot.guifx.images;

import bluej.utility.javafx.JavaFXUtil;
import javafx.collections.FXCollections;
import javafx.geometry.Orientation;
import javafx.scene.control.ListCell;
import javafx.scene.control.ListView;
import javafx.scene.control.SelectionMode;
import javafx.scene.image.Image;
import javafx.scene.image.ImageView;
import threadchecker.OnThread;
import threadchecker.Tag;

import java.io.File;
import java.util.Arrays;




| A list which allows selecting image categories. The categories
| available are determined by scanning a directory for subdirectories.
| Selecting a category will make a corresponding ImageLibList show
| the contents of that category.
|
| @author davmac
|
@OnThread(Tag.FXPlatform)
public class ImageCategorySelector extends ListView<File>{    
   private ImageLibList imageLibList;
    
   
   


| Construct an ImageCategorySelector to show categories from the
| given directory.
|
| @param categoriesRoot  The directory containing the categories
|                     (subdirectories)
|
public ImageCategorySelector(File categoriesRoot)
   {
      setOrientation(Orientation.VERTICAL);
      getSelectionModel().setSelectionMode(SelectionMode.SINGLE);
       
      setCellFactory(param -> new ImageCell());

       
      
      File[] categoriesFolders = categoriesRoot.listFiles(File::isDirectory);
      if (categoriesFolders == null)
       {            
         return;         
         }
        
      Arrays.sort(categoriesFolders);
      setItems(FXCollections.observableArrayList(categoriesFolders));

      JavaFXUtil.addChangeListenerPlatform(getSelectionModel().selectedItemProperty(), selected -> {
      if (imageLibList != null && selected != null)
           {
         imageLibList.setDirectory(selected);             
         }         
      });
   }

   



| Set the ImageLibList to be associated with this category selector.
| When a category is selected, the associated ImageLibList will be
| made to show images from the category.
|
| @param imageLibList  The ImageLibList to associate with this category
|                      selector
|
public void setImageLibList(ImageLibList imageLibList)
   {        
   this.imageLibList = imageLibList;     
   }
    
@OnThread(Tag.FXPlatform)
   
private static class ImageCell extends ListCell<File>
   {        
   private static final String iconFile = "openRight.png";
       
   private static final Image openRightIcon = new Image(ImageCategorySelector.class.getClassLoader().getResource(iconFile).toString());

       
   @Override
   @OnThread(value = Tag.FXPlatform, ignoreParent = true)
       
   public void updateItem(File file, boolean empty)
       {
      super.updateItem(file, empty);
      if (empty || file == null)
           {
         setText(null);
         setGraphic(null);             
         }
           

      else
           {
         setText(file.getName());
               
         setGraphic(new ImageView(openRightIcon));             
         }         
      }     
   } 
}