// SlideIntegerAttributeEditor.java
// $Id: SlideIntegerAttributeEditor.java,v 1.5 2000/10/31 15:08:45 ylafon Exp $
// (c) COPYRIGHT MIT and INRIA, 1997.
// Please first read the full copyright statement in file COPYRIGHT.html

package org.w3c.jigadmin.attributes;

import java.awt.Component;

import java.util.Properties;

import org.w3c.tools.resources.Attribute;

import org.w3c.jigadmin.widgets.EditableSlider;

import org.w3c.jigsaw.admin.RemoteAccessException;
import org.w3c.jigsaw.admin.RemoteResource;

import org.w3c.jigadm.RemoteResourceWrapper;
import org.w3c.jigadm.editors.AttributeEditor;

/**
 * SlideIntegerAttributeEditor :
 * @author Benoit Mahe <bmahe@sophia.inria.fr>
 */

public class SlideIntegerAttributeEditor extends AttributeEditor {

    /**
     * The slider's max bound property.
     */
    public static final String MAX_P = "slider.max";

    /**
     * The slider's min bound property.
     */
    public static final String MIN_P = "slider.min";

    /**
     * The slider's step property.
     */
    public static final String STEP_P = "slider.step";

    /**
     * The slider border property
     */
    public static final String BORDER_P = "slider.border";

    private int origs;
    EditableSlider widget;

    /**
     * Tells if the edited value has changed
     * @return true if the value changed.
     */
    public boolean hasChanged(){
	return (origs != widget.getValue());
    }

    /**
     * set the current value to be the original value, ie: changed
     * must return <strong>false</strong> after a reset.
     */
    public void clearChanged(){
	origs = widget.getValue();
    }

    /**
     * reset the changes (if any)
     */
    public void resetChanges(){
	widget.setValue(origs);
    }

    /**
     * Get the current value of the edited value
     * @return an object or <strong>null</strong> if the object was not
     * initialized
     */
    public Object getValue(){
	return new Integer(widget.getValue());
    }

    /**
     * Set the value of the edited value
     * @param o the new value.
     */
    public void setValue(Object o){
	widget.setValue(((Integer)o).intValue());
    }

    /**
     * get the Component created by the editor.
     * @return a Component
     */
    public Component getComponent() {
	return widget;
    }

    public EditableSlider getSlider(int min, int max, int step, int value) {
	//negative value not accepted
	min   = (min < 0 ? 0 : min);
	max   = (max < 0 ? 0 : max);
	step  = (step < 0 ? 0 : step);
	value = (value < 0 ? 0 : value);
	if (min > max) {
	    min = max;
	}
	if (value <= min ) {
	    min = Math.max(0, value - (max - min) / 5 );
	}
	if (value >= max ) {
	    max = value + (max - min) / 5;
	}
	EditableSlider slider = new EditableSlider(min, max, step, value);
	return slider;
    }

    /**
     * Initialize the editor
     * @param w the ResourceWrapper father of the attribute
     * @param a the Attribute we are editing
     * @param o the value of the above attribute
     * @param p some Properties, used to fine-tune the editor
     * @exception RemoteAccessException if a remote access error occurs.
     */  
    public void initialize(RemoteResourceWrapper w, Attribute a, Object o,
			   Properties p)
	throws RemoteAccessException
    {
	int min = -1; int max = -1; int step = -1;
	if (p != null) {

	    try { min = Integer.parseInt(p.getProperty(MIN_P,"0")); } 
	    catch (NumberFormatException ex) { min = 0; }

	    try { max = Integer.parseInt(p.getProperty(MAX_P,"100")); } 
	    catch (NumberFormatException ex) { max = 100; }

	    try { step = Integer.parseInt(p.getProperty(STEP_P,"5")); }
            catch (NumberFormatException ex) { step = 5; }

	} else {
	    min = 0; max = 100; step = 5;
	}
	RemoteResource r = w.getResource();
	if(o == null) {
	    Integer v = (Integer) r.getValue(a.getName());
	    if(v == null)
		if(a.getDefault() != null)
		    v = (Integer)a.getDefault();
	    if ( v != null ) {
		origs = v.intValue();
	    } 
	} else {
	    origs = ((Integer)o).intValue();
	}
	widget = getSlider(min, max, step, origs);
    }

    public SlideIntegerAttributeEditor () {
    }

}
