ControlDelegate.java example

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/*
 * Copyright (c) 2010, grossmann
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 *   names of its contributors may be used to endorse or promote products
 *   derived from this software without specific prior written permission.
 * 
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 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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package org.jowidgets.impl.base.delegate;

import org.jowidgets.api.controller.IParentListener;
import org.jowidgets.api.controller.IParentObservable;
import org.jowidgets.api.widgets.IComponent;
import org.jowidgets.api.widgets.IContainer;
import org.jowidgets.api.widgets.IControl;
import org.jowidgets.api.widgets.IPopupMenu;
import org.jowidgets.spi.widgets.IControlSpi;
import org.jowidgets.tools.controller.ParentObservable;

public class ControlDelegate extends DisposableDelegate implements IParentObservable<IContainer> {

    private final IControl control;
    private final PopupMenuCreationDelegate popupMenuCreationDelegate;
    private final ParentObservable<IContainer> parentObservable;

    private IContainer parent;
    private boolean onRemoveByDispose;

    public ControlDelegate(final IControlSpi controlSpi, final IControl control) {
        super();
        this.control = control;
        this.popupMenuCreationDelegate = new PopupMenuCreationDelegate(controlSpi, control);
        this.parentObservable = new ParentObservable<IContainer>();
        this.onRemoveByDispose = false;
    }

    public IContainer getParent() {
        return parent;
    }

    public void setParent(final IComponent parent) {
        if (this.parent == null) {
            if (parent instanceof IContainer) {
                final IContainer parentContainer = (IContainer) parent;
                this.parent = parentContainer;
                parentObservable.fireParentChanged(null, parentContainer);
            }
            else {
                throw new IllegalArgumentException("Parent must be instance of '" + IContainer.class.getName() + "'");
            }
        }
        else if (!isReparentable()) {
            throw new IllegalStateException("Widget is not reparentable");
        }

    }

    public boolean isReparentable() {
        //TODO MG will be implemented later
        return false;
    }

    @Override
    public void dispose() {
        if (!isDisposed()) {
            if (parent != null && parent.getChildren().contains(control) && !onRemoveByDispose) {
                onRemoveByDispose = true;
                parent.remove(control); //this will invoke dispose by the parent container
                onRemoveByDispose = false;
            }
            else {
                popupMenuCreationDelegate.dispose();
                super.dispose();
            }
        }
    }

    public IPopupMenu createPopupMenu() {
        return popupMenuCreationDelegate.createPopupMenu();
    }

    @Override
    public void addParentListener(final IParentListener<IContainer> listener) {
        parentObservable.addParentListener(listener);
    }

    @Override
    public void removeParentListener(final IParentListener<IContainer> listener) {
        parentObservable.removeParentListener(listener);
    }
}