// This Source Code is in the Public Domain per: http://unlicense.org
package org.litesoft.ui.def.nonpublic.support;

import org.litesoft.ui.def.*;

public abstract class AbstractUiChildrenHelperTwoDimensional extends AbstractUiChildrenHelper
{
    public AbstractUiChildrenHelperTwoDimensional( UiLayoutTwoDimensionalDef pOwner )
    {
        super( pOwner, 3 );
    }

    public boolean acceptableChild( UiDef pChild )
    {
        return (pChild instanceof UiGridLayoutableDef);
    }

    public Object getAcceptableChildClass()
    {
        return UiGridLayoutableDef.class;
    }

    public void customValidateChildren()
    {
        int columns = getColumns();

        customValidateMinimumChildren( columns + 1 );

        ComponentGrid grid = getComponentGrid(); // Validates on construction
        if ( grid.getColumns() != columns )
        {
            childrenChanged();
            getComponentGrid(); // Validates on construction
        }
    }

    private int getColumns()
    {
        return ((UiLayoutTwoDimensionalDef) mOwner).getColumns();
    }

    protected void childrenChanged()
    {
        super.childrenChanged();
        mCachedGrid = null;
    }

    private transient ComponentGrid mCachedGrid = null;

    public ComponentGrid getComponentGrid()
    {
        if ( mCachedGrid == null )
        {
            mCachedGrid = new ComponentGrid( getColumns(), getChildren() );
        }
        return mCachedGrid;
    }
}