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WebLaf is a Java Swing Look and Feel and extended components library for cross-platform applications

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/*
 * This file is part of WebLookAndFeel library.
 *
 * WebLookAndFeel library is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * WebLookAndFeel library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with WebLookAndFeel library.  If not, see .
 */

package com.alee.extended.layout;

import java.awt.*;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

/**
 * @author Mikle Garin
 */

public class ComponentPanelLayout extends AbstractLayoutManager
{
    protected List components = new ArrayList ();
    protected Map yShift = new HashMap ();

    public List getComponents ()
    {
        return components;
    }

    public void setComponentShift ( final Component component, final Integer shift )
    {
        yShift.put ( component, shift );
    }

    public Integer getComponentShift ( final Component component )
    {
        return yShift.get ( component );
    }

    public int indexOf ( final Component component )
    {
        return components.indexOf ( component );
    }

    public Component getComponent ( final int index )
    {
        return components.get ( index );
    }

    @Override
    public void addComponent ( final Component component, final Object constraints )
    {
        components.add ( component );
    }

    @Override
    public void removeComponent ( final Component component )
    {
        components.remove ( component );
    }

    public void insertLayoutComponent ( final int index, final Component comp )
    {
        components.add ( index, comp );
    }

    @Override
    public Dimension preferredLayoutSize ( final Container parent )
    {
        final Insets insets = parent.getInsets ();
        int width = insets.left + insets.right;
        int height = insets.top + insets.bottom;
        for ( final Component component : components )
        {
            final Dimension ps = component.getPreferredSize ();
            width = Math.max ( width, insets.left + ps.width + insets.right );
            height += ps.height;
        }
        return new Dimension ( width, height );
    }

    @Override
    public void layoutContainer ( final Container parent )
    {
        final Insets insets = parent.getInsets ();
        int y = insets.top;
        for ( final Component component : components )
        {
            final Dimension ps = component.getPreferredSize ();

            final Integer shift = yShift.get ( component );
            component.setBounds ( insets.left, shift == null ? y : y + shift, parent.getWidth () - insets.left - insets.right, ps.height );

            y += ps.height;
        }
    }
}