Application: gvSIG desktop

package org.gvsig.gui.beans.simplecombobox;

import javax.swing.JComboBox;

/**

 * <p>Simple ComboBox component to add items with an associated code.

 * Typical usage would be adding Strings items and associated action

 * codes. Example</p>

 * <pre>SimpleComboBox combo = new SimpleComboBox();

 * combo.addItem("Left", TextComponent.ALIGN_LEFT);

 * combo.addItem("Right", TextComponent.ALIGN_RIGHT;

 * combo.addItem("Center", TextComponent.ALIGN_CENTER);

 * combo.addItem("Justify", TextComponent.ALIGN_JUSTIFY);

 * . . .

 * int textAlign = combo.getSelectedCode();

 * textComponent.align(textAlign);

 * </pre>

 * <p>This component provides a basic selection autocompletion when the user

 * presses a key (while the combo has the focus).</p>

 * 

 * @author Cesar Martinez Izquierdo <cesar.martinez@iver.es>

 *

 */

public class SimpleComboBox extends JComboBox {

	private static final long serialVersionUID = 5805274299238455334L;

	public SimpleComboBox() {

        super();

    }

	/**

	 * <p>Invalid method, do not use it. Use

	 * {@link #addItem(Object, int)} instead.</p>

	 */

	public void addItem(Object anObject) {

		throw new RuntimeException("Invalid method: use addItem(Object anObject, int code) instead or regular Swing JComboBox");

	}

    public void addItem(Object anObject, int code) {

    	ComboItem item = new ComboItem(anObject, code);

    	super.addItem(item);

    }

    public Object getItemAt(int index) {

    	ComboItem item = (ComboItem) super.getItemAt(index);

    	if (item!=null) {

    		return item.getObject();

    	}

    	return null;

    }

    public Object getSelectedItem() {

    	ComboItem item = (ComboItem) super.getSelectedItem();

    	if (item!=null) {

    		return item.getObject();

    	}

    	return null;

    }

    public void setSelectedIndex(int anIndex) {

        int size = dataModel.getSize();

        if ( anIndex == -1 ) {

            setSelectedItem( null );

        } else if ( anIndex < -1 || anIndex >= size ) {

            throw new IllegalArgumentException("setSelectedIndex: " + anIndex + " out of bounds");

        } else {

        	Object item = dataModel.getElementAt(anIndex);

            super.setSelectedItem(item);

        }

    }

    public void setSelectedItem(Object anObject) {

    	ComboItem item;

    	for (int i=0; i<getItemCount(); i++) {

    		item = (ComboItem) super.getItemAt(i);

    		if (item.getObject().equals(anObject)) {

    			super.setSelectedItem(item);    			

    		}

    	}

    }

    public void setSelectedCode(int code) {

    	ComboItem item;

    	for (int i=0; i<getItemCount(); i++) {

    		item = (ComboItem) super.getItemAt(i);

    		if (item.getCode()==code) {

    			super.setSelectedItem(item);    			

    		}

    	}

    }

    public Object[] getSelectedObjects() {

    	Object obj = getSelectedItem();

    	if (obj!=null) {

    		return new Object[]{obj};

    	}

    	else {

    		return new Object[0];

    	}

    }

    /**

     * Gets the code associated to the selected item

     * @return

     */

    public int getSelectedCode() {

    	ComboItem item = (ComboItem) super.getSelectedItem();

    	if (item!=null) {

    		return item.getCode();

    	}

    	return -1;

    }

    private class ComboItem {

    	private Object theObject;

    	private int code;

    	public ComboItem(Object object, int code) {

    		this.theObject = object;

    		this.code = code;

    	}

		public void setObject(Object theObject) {

			this.theObject = theObject;

		}

		public Object getObject() {

			return theObject;

		}

		public void setCode(int code) {

			this.code = code;

		}

		public int getCode() {

			return code;

		}

		public String toString() {

			return theObject.toString();

		}

    }

}