// This Source Code is in the Public Domain per: http://unlicense.org
package org.litesoft.GWT.client.widgets.nonpublic;

import com.google.gwt.user.client.*;
import com.google.gwt.user.client.ui.*;

import java.util.*;

public class ConstrainingSizeableOuterLayers extends AbstractSizeablePanel {
    private Widget mInnerWidget;

    public ConstrainingSizeableOuterLayers( Widget pInnerWidget, String pStyle ) {
        this( pInnerWidget, pStyle, true );
    }

    public ConstrainingSizeableOuterLayers( Widget pInnerWidget, String pStyle, boolean pHidden ) {
        this( pInnerWidget, pStyle, pHidden, pInnerWidget.getElement() );
    }

    public ConstrainingSizeableOuterLayers( Widget pInnerWidget, String pStyle, boolean pHidden, Element pInnerElement ) {
        //noinspection GWTStyleCheck
        pInnerWidget.setStyleName( "" );
        initializeElements( getHelper().create_OeTable_SeDiv( pHidden ), pStyle );
        setWidget( pInnerWidget );
        getHelper().setInnerElement( pInnerElement );
    }

    /**
     * Adds a widget to this panel.
     *
     * @param w the child widget to be added
     */
    @Override
    public void add( Widget w ) {
        // Can't add() more than one widget to a SimplePanel.
        if ( getWidget() != null ) {
            throw new IllegalStateException( "Use setWidget since only one child widget supported" );
        }
        setWidget( w );
    }

    /**
     * Gets the panel's child widget.
     *
     * @return the child widget, or <code>null</code> if none is present
     */
    public Widget getWidget() {
        return mInnerWidget;
    }

    @Override
    public boolean anyChildren() {
        return (mInnerWidget != null);
    }

    @Override
    public Iterator<Widget> iterator() {
        return new SingleWidgetIterator( mInnerWidget ) {
            @Override
            public void remove() {
                ConstrainingSizeableOuterLayers.this.remove( mInnerWidget );
            }
        };
    }

    @Override
    public boolean remove( Widget w ) {
        if ( mInnerWidget == w ) {
            disown( w );
            mInnerWidget = null;
            return true;
        }
        return false;
    }

    /**
     * Sets this panel's widget. Any existing child widget will be removed.
     *
     * @param w the panel's new widget (<code>null</code> will clear the panel)
     */
    public void setWidget( Widget w ) {
        // If there is already a widget attached, remove it.
        if ( mInnerWidget != null ) {
            disown( mInnerWidget );
        }

        if ( w != null ) {
            // Adopt the child.
            adopt( w, getContainerElement() );
        }

        mInnerWidget = w;
    }

    @Override
    public void setWidth( String width ) {
        super.setWidth( width ); // for stacktrace Debugging
    }

    @Override
    public void setHeight( String height ) {
        super.setHeight( height ); // for stacktrace Debugging
    }

    @Override
    protected void distributeToChildrenChangedWidth() {
        getHelper().forceAdjustDimensionOnChild( mInnerWidget, getWidthHelper() );
    }

    @Override
    protected void distributeToChildrenChangedHeight() {
        getHelper().forceAdjustDimensionOnChild( mInnerWidget, getHeightHelper() );
    }
}