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package com.livio.sdl.menu;
import java.util.ArrayList;
import java.util.Collections;
import java.util.List;
/**
* Represents a submenu button that can be clicked on the SDL-connected head-unit. A submenu
* contains all the fields contained in the MenuItem parent class, as well as maintaining a list
* of children commands.
*
* @author Mike Burke
*
*/
public class SubmenuButton extends MenuItem {
private List<MenuItem> children;
public SubmenuButton(SubmenuButton copy){
super(copy.getName(), copy.getId(), true);
copyChildren(copy.getChildren());
}
public SubmenuButton(String name, int id) {
super(name, id, true);
}
/**
* Creates a copy of the children to ensure there are no leaked references to the
* children of the object we're copying.
*
* @param children
*/
private void copyChildren(List<MenuItem> children){
if(children == null || children.size() <= 0){
return;
}
if(this.children == null){
this.children = new ArrayList<MenuItem>(children.size());
}
for(MenuItem child : children){
if(child.isMenu()){
this.children.add(new SubmenuButton((SubmenuButton) child));
}
else{
this.children.add(new CommandButton((CommandButton) child));
}
}
}
/**
* Returns a copy of the list of all children associated with this menu item. If there
* are no children associated with this menu item, this method will return an empty list.
*
* @return A copy of the list of children
*/
public List<MenuItem> getChildren(){
if(children == null || children.size() <= 0){
return Collections.emptyList();
}
return new ArrayList<MenuItem>(children);
}
/**
* Adds a child to this submenu object.
*
* @param item The item to add
*/
public void addChild(MenuItem item){
if(children == null){
children = new ArrayList<MenuItem>();
}
children.add(item);
}
/**
* Removes a child from this submenu object.
*
* @param childId The id of the child to remove
*/
public void removeChild(int childId){
if(children == null || children.size() <= 0){
return;
}
for(MenuItem child : children){
if(childId == child.getId()){
children.remove(child);
return;
}
}
}
/**
* Removes all children from this submenu object.
*/
public void removeAllChildren(){
if(children == null || children.size() <= 0){
return;
}
children.clear();
}
}
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