/*
* This file is part of lanterna (http://code.google.com/p/lanterna/).
*
* lanterna is free software: you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with this program. If not, see .
*
* Copyright (C) 2010-2015 Martin
*/
package com.googlecode.lanterna.gui2;
import com.googlecode.lanterna.TerminalPosition;
import com.googlecode.lanterna.input.KeyStroke;
import java.util.Collection;
import java.util.Collections;
/**
* This abstract implementation contains common code for the different {@code Composite} implementations. A
* {@code Composite} component is one that encapsulates a single component, like borders. Because of this, a
* {@code Composite} can be seen as a special case of a {@code Container} and indeed this abstract class does in fact
* implement the {@code Container} interface as well, to make the composites easier to work with internally.
* @author martin
* @param Should always be itself, see {@code AbstractComponent}
*/
public abstract class AbstractComposite extends AbstractComponent implements Composite, Container {
private Component component;
/**
* Default constructor
*/
public AbstractComposite() {
component = null;
}
@Override
public void setComponent(Component component) {
Component oldComponent = this.component;
if(oldComponent == component) {
return;
}
if(oldComponent != null) {
removeComponent(oldComponent);
}
if(component != null) {
this.component = component;
component.onAdded(this);
component.setPosition(TerminalPosition.TOP_LEFT_CORNER);
invalidate();
}
}
@Override
public Component getComponent() {
return component;
}
@Override
public int getChildCount() {
return component != null ? 1 : 0;
}
@Override
public Collection getChildren() {
if(component != null) {
return Collections.singletonList(component);
}
else {
return Collections.emptyList();
}
}
@Override
public boolean containsComponent(Component component) {
return component != null && component.hasParent(this);
}
@Override
public boolean removeComponent(Component component) {
if(this.component == component) {
this.component = null;
component.onRemoved(this);
invalidate();
return true;
}
return false;
}
@Override
public boolean isInvalid() {
return component != null && component.isInvalid();
}
@Override
public void invalidate() {
super.invalidate();
//Propagate
if(component != null) {
component.invalidate();
}
}
@Override
public Interactable nextFocus(Interactable fromThis) {
if(fromThis == null && getComponent() instanceof Interactable) {
return (Interactable)getComponent();
}
else if(getComponent() instanceof Container) {
return ((Container)getComponent()).nextFocus(fromThis);
}
return null;
}
@Override
public Interactable previousFocus(Interactable fromThis) {
if(fromThis == null && getComponent() instanceof Interactable) {
return (Interactable)getComponent();
}
else if(getComponent() instanceof Container) {
return ((Container)getComponent()).previousFocus(fromThis);
}
return null;
}
@Override
public boolean handleInput(KeyStroke key) {
return false;
}
@Override
public void updateLookupMap(InteractableLookupMap interactableLookupMap) {
if(getComponent() instanceof Container) {
((Container)getComponent()).updateLookupMap(interactableLookupMap);
}
else if(getComponent() instanceof Interactable) {
interactableLookupMap.add((Interactable)getComponent());
}
}
}