package bluej.utility.javafx;

import java.util.ArrayList;
import java.util.IdentityHashMap;
import java.util.List;
import javafx.beans.property.ReadOnlyObjectProperty;
import javafx.beans.property.SimpleObjectProperty;
import javafx.geometry.Pos;
import javafx.scene.Node;
import javafx.scene.control.ButtonBase;
import javafx.scene.control.RadioButton;
import javafx.scene.control.ToggleButton;
import javafx.scene.control.ToggleGroup;
import javafx.scene.layout.HBox;

import bluej.extensions.SourceType;




| A set of controls which look like toggleable push buttons, of which
| only one can be selected.  They are actually implemented as radio buttons,
| to get the right interface interactions, hence the name of the class.
|
| Useful if you small (2--5) fixed set of choices but want to display them
| in one row, rather than down a column.
|
| Note: the styling for this is currently in dialogs.css, so it won't work
| outside a dialog unless you rearrange the CSS files.
|
public class HorizontalRadio<T>{    
   

| The HBox containing the buttons
|
private final HBox hBox;
   
   

| A map from value to buttons.
|
private final IdentityHashMap<T, ButtonBase> buttonsByValue = new IdentityHashMap<>();
   
   

| The currently selected item.
|
private final SimpleObjectProperty<T> selected = new SimpleObjectProperty<T>();

   
   


| Creates a set of buttons for the given list of choices.
|
| Often this is an enum.  The text on each button is determined by calling toString on the item.
|
public HorizontalRadio(List<T> choices)
   {        
      List<Node> buttons = new ArrayList<>();
       
      ToggleGroup toggleGroup = new ToggleGroup();
       
      for (int i = 0; i < choices.size(); i++)
       {
         T value = choices.get(i);
           
         ToggleButton button = new RadioButton(value.toString());
         buttonsByValue.put(value, button);
         JavaFXUtil.addChangeListener(button.selectedProperty(), sel -> {
         if (sel.booleanValue())
         selected.set(value);             
         });
      button.setToggleGroup(toggleGroup);
      JavaFXUtil.addStyleClass(button, "radio-check-border");
      button.maxWidthProperty().bind(button.prefWidthProperty());
      button.getStyleClass().addAll("toggle-button", i == 0 ? "left-pill" : (i == choices.size() - 1 ? "right-pill" : "center-pill"));
      buttons.add(button);         
      }
       
   hBox = new HBox(buttons.toArray(new Node[0]));
   hBox.setAlignment(Pos.BASELINE_LEFT);     
   }

   



| Gets the actual GUI node containing all the buttons.
|
public HBox getButtons()
   {        
   return hBox;     
   }

   



| Allows you to observe the current selection.
|
public ReadOnlyObjectProperty selectedProperty()
   {        
   return selected;     
   }

   



| Selects the given item.  This must be the same reference as one
| of the items in the list passed to the constructor.
|
public void select(T item)
   {
   buttonsByValue.get(item).fire();     
   }

   
public void setDisable(boolean disabled)
   {        
   for (ButtonBase button : buttonsByValue.values())
       {
      button.setDisable(disabled);         
      }     
   } 
}