/*

File: JavaColorWell.java

Abstract:  CocoaComponent extension allowing NSColorWell

    to be embedded in Java containers.  Maintains a set 

    of listeners to communicate color changes: note the

    use of invokeLater to ensure listener notification occurs

    on the AWT Event Queue.

Version: 1.0

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*/ 

package apple.dts.samplecode.cwcocoacomponent;

import java.awt.*;

import java.util.ArrayList;

import java.util.Iterator;

import apple.dts.samplecode.cwcocoacomponent.event.*;

public class JavaColorWell extends com.apple.eawt.CocoaComponent {

    static {

        System.loadLibrary("JavaColorWell");

        // initialize any JNI callbacks at classload; jmethodIDs remain valid

        initMethodIDs();

    }

    // Constants for CocoaComponent sendMessage calls 

    // Matched to the enum in JavaColorWell.m

    final static int CLOSE_PANEL    = 0;

    final static int DEACTIVATE     = 1;

    final static int REMOVE_NOTIFY  = 2;

    // Constants for max/min/preferred size

    private static Dimension DEFAULT_SIZE   = new Dimension(52, 24);    // Default NSColorWell size in Interface Builder

    private static Dimension MAX_SIZE       = new Dimension(104, 48);

    // ColorSelectionListener storage

    private ArrayList listeners = new ArrayList();

    public JavaColorWell() { }

    public JavaColorWell(ColorSelectionListener csl) {

        addColorSelectionListener(csl);

    }

    // This is a callback function for the underlying NSColorWell extension

    // Calling this method from Java will NOT sync the colorwell

    private void cocoaColorChange(final float r, final float g, final float b, final float a) {

        Iterator i = listeners.iterator();

        final Color color = new Color(r, g, b, a);

        while (i.hasNext()) {

            final ColorSelectionEvent cse = new ColorSelectionEvent (color, this);

            final ColorSelectionListener csl = (ColorSelectionListener)i.next();

            EventQueue.invokeLater(new Runnable() {

                public void run() {

                    csl.colorSelectionChange(cse);

                }

            });

        }

    }

    // Tell the peer we've been removed from the hierarchy in case cleanup is needed

    // CocoaComponent implementation will release the peer itself

    public void removeNotify() {

        sendMessage(REMOVE_NOTIFY, null);

        super.removeNotify();

    }

    /*

     * Straightforward listener support

     */

    public void addColorSelectionListener(ColorSelectionListener csl) {

        if (listeners.contains(csl)) return;

        listeners.add(csl);

    }

    public void removeColorSelectionListener(ColorSelectionListener csl) {

        listeners.remove(csl);

    }

    /*

     * CocoaComponent implements

     */

    public Dimension getPreferredSize() {

        return DEFAULT_SIZE;

    }

    public Dimension getMinimumSize() {

        return DEFAULT_SIZE;

    }

    public Dimension getMaximumSize() {

        return MAX_SIZE;

    }

    /*

     * Native methods

     */

    public static native void initMethodIDs();

    // createNSViewLong is strongly recommended in CocoaComponent extensions;

    // as of Mac OS X Tiger the 32-bit (int) createNSView is deprecated

    public native long createNSViewLong();

    public int createNSView() {

        return (int) createNSViewLong();

    }

}