// 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.*;

public abstract class AbstractSizeableHasAlignmentPanel extends AbstractSizeablePanel implements HasAlignment {
    private HorizontalAlignmentConstant mHorzAlign = ALIGN_LEFT;
    private VerticalAlignmentConstant mVertAlign = ALIGN_TOP;

    // vvvvvvvvvvv HasAlignment

    @Override
    public HorizontalAlignmentConstant getHorizontalAlignment() {
        return mHorzAlign;
    }

    @Override
    public VerticalAlignmentConstant getVerticalAlignment() {
        return mVertAlign;
    }

    /**
     * Sets the default horizontal alignment to be used for widgets added to this
     * panel. It only applies to widgets added after this property is set.
     *
     * @see HasHorizontalAlignment#setHorizontalAlignment(HorizontalAlignmentConstant)
     */
    @Override
    public void setHorizontalAlignment( HorizontalAlignmentConstant pAlign ) {
        if ( pAlign != null ) {
            mHorzAlign = pAlign;
        }
    }

    /**
     * Sets the default vertical alignment to be used for widgets added to this
     * panel. It only applies to widgets added after this property is set.
     *
     * @see HasVerticalAlignment#setVerticalAlignment(VerticalAlignmentConstant)
     */
    @Override
    public void setVerticalAlignment( VerticalAlignmentConstant pAlign ) {
        if ( pAlign != null ) {
            mVertAlign = pAlign;
        }
    }

    // ^^^^^^^^^^^ HasAlignment

    /**
     * Sets the horizontal alignment of the given widget within its cell.
     *
     * @param pWidget the widget whose horizontal alignment is to be set
     * @param pAlign  the widget's horizontal alignment, as defined in
     *                {@link HasHorizontalAlignment}.
     */
    public void setCellHorizontalAlignment( Widget pWidget, HorizontalAlignmentConstant pAlign ) {
        if ( pAlign != null ) {
            Element td = getOurWidgetTd( pWidget );
            if ( td != null ) {
                setAlignment( td, pAlign );
            }
        }
    }

    /**
     * Sets the vertical alignment of the given widget within its cell.
     *
     * @param pWidget the widget whose vertical alignment is to be set
     * @param pAlign  the widget's vertical alignment, as defined in
     *                {@link HasVerticalAlignment}.
     */
    public void setCellVerticalAlignment( Widget pWidget, VerticalAlignmentConstant pAlign ) {
        if ( pAlign != null ) {
            Element td = getOurWidgetTd( pWidget );
            if ( td != null ) {
                setAlignment( td, pAlign );
            }
        }
    }

    @Override
    protected Element adopt( Widget w, Element container ) {
        Element rv = super.adopt( w, container );
        setAlignment( getWidgetTd( w ) );
        return rv;
    }

    private void setAlignment( Element pTD ) {
        setAlignment( pTD, mHorzAlign );
        setAlignment( pTD, mVertAlign );
    }

    private void setAlignment( Element pTD, HorizontalAlignmentConstant pAlign ) {
        CommonElementHelper.setTDalign( pTD, pAlign );
    }

    private void setAlignment( Element pTD, VerticalAlignmentConstant pAlign ) {
        CommonElementHelper.setTDvAlign( pTD, pAlign );
    }

    protected Element getOurWidgetTd( Widget pWidget ) {
        return isOur( pWidget ) ? getWidgetTd( pWidget ) : null;
    }

    protected Element getWidgetTd( Widget pWidget ) {
        return DOM.getParent( pWidget.getElement() );
    }
}