package org.apidesign.extensibleicon;

import java.awt.Component;

import java.awt.Graphics;

import java.io.IOException;

import org.openide.util.Lookup;

import org.openide.util.lookup.AbstractLookup;

import org.openide.util.lookup.InstanceContent;

// BEGIN: ext.modifiable.icon

public final class ModifiableIcon implements ExtIcon {

    // AbstractLookup is helper implementation

    // so that people do not need to write its own

    // lookup from scratch

    private AbstractLookup lookup;

    // InstanceContent is interface that gives

    // "creator of the lookup" more rights, like

    // ability to modify the content

    private InstanceContent ic;

    ModifiableIcon() {

        ic = new InstanceContent();

        lookup = new AbstractLookup(ic);

    }

    public Lookup getLookup() {

        return lookup;

    }

    public void markModified() {

        if (lookup.lookup(ModifiedImpl.class) == null) {

            ic.add(new ModifiedImpl());

        }

    }

    private final class ModifiedImpl implements Modified {

        public void save() throws IOException {

            // save somehow

        }

        public void discard() throws IOException {

            // discard changes

        }

    }

// FINISH: ext.modifiable.icon

    public void paintIcon(Component c, Graphics g, int x, int y) {

        g.fillRect(x, y, 16, 16);

    }

    public int getIconWidth() {

        return 16;

    }

    public int getIconHeight() {

        return 16;

    }

}