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

import org.litesoft.GWT.client.*;
import org.litesoft.core.delayed.*;

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

public class ContentSizeableSimplePanel extends ClippingSimplePanel {
    public ContentSizeableSimplePanel() {
        this( null, null );
    }

    public ContentSizeableSimplePanel( Widget pWidget ) {
        this( null, pWidget );
    }

    /**
     * @param pNoSizeAffectingCSS_StyleClassname a style name or null
     * @param pWidget                            a widget or null. Call {@link #setWidget(Widget)} if this is null.
     */
    public ContentSizeableSimplePanel( String pNoSizeAffectingCSS_StyleClassname, Widget pWidget ) {
        super( pNoSizeAffectingCSS_StyleClassname );
        if ( pWidget != null ) {
            setWidget( pWidget );
        }
    }

    @Override
    public void setWidget( Widget pWidget ) {
        super.setWidget( pWidget );
        updateChildSize();
    }

    @Override
    protected void onAttach() {
        super.onAttach();
        updateChildSize();
    }

    @Override
    public void setVisible( boolean visible ) {
        super.setVisible( visible );
        updateChildSize();
    }

    protected void updateChildSize() {
        if ( !LLupdateChildSize() ) {
            LLupdateChildSizeLater();
        }
    }

    private boolean LLupdateChildSize() {
        Widget zWidget = getWidget();
        if ( isVisible() && isAttached() && (zWidget != null) ) {
            int zWidth = getOffsetWidth();
            int zHeight = getOffsetHeight();
            if ( (10 > zWidth) || (10 > zHeight) ) {
                return false;
            }
            LLupdateChildWidth( zWidget, zWidth );
            LLupdateChildHeight( zWidget, zHeight );
        }
        return true;
    }

    protected void LLupdateChildHeight( Widget pWidget, int pHeight ) {
        pWidget.setHeight( "" + pHeight );
    }

    protected void LLupdateChildWidth( Widget pWidget, int pWidth ) {
        pWidget.setWidth( "" + pWidth );
    }

    private void LLupdateChildSizeLater() {
        if ( !mUpdateChildSizeDeffered ) {
            mUpdateChildSizeDeffered = true;
            TimedRunnableManager.INSTANCE.runIn( mLaterUpdateChildSize, 50 );
        }
    }

    private boolean mUpdateChildSizeDeffered = false;
    private TimedRunnable mLaterUpdateChildSize = new TimedRunnable() {
        @Override
        public Again runOnce() {
            try {
                if ( !LLupdateChildSize() ) {
                    return new RunAgainIn( 100 );
                }
            }
            catch ( RuntimeException e ) {
                e.printStackTrace();
            }
            mUpdateChildSizeDeffered = false;
            return null;
        }
    };
}