
package jp.riken.brain.ni.samuraigraph.base;

import java.awt.Color;
import java.awt.Dimension;
import java.awt.event.ActionEvent;
import java.util.ArrayList;

import javax.swing.BorderFactory;
import javax.swing.JComboBox;


/**
 * A combo box to display the magnification.
 *
 */
public class SGZoomComboBox extends JComboBox
	implements SGIRootObjectConstants
{

	private static final String PERCENT = "%";


	/**
	 * The default constructor.
	 */
	public SGZoomComboBox()
	{
		super();
		this.init();
	}

	// initialize the combo box
	private void init()
	{

		// add items
		String[] array = MAGNIFICATION_STRING_ARRAY;
		for( int ii=0; ii<array.length; ii++ )
		{
			this.addItem( array[ii] + PERCENT );
		}
		this.addItem( AUTO_ZOOM_IN_COMBO_BOX );


		this.setEditable( true );
		this.setToolTipText( TIP_ZOOM );
		this.setFont( new java.awt.Font("Dialog", 1, 12) );

		Dimension dim;
		String laf = SGUtility.getLookAndFeelID();
		if( !LAF_AQUA.equals(laf) & !LAF_WINDOWS.equals(laf) )
		{
			dim = new Dimension(120,25);
			this.setBackground( Color.WHITE );
			this.setBorder( BorderFactory.createLoweredBevelBorder() );
		}
		else
		{
			dim = new Dimension(120,22);
		}
		this.setPreferredSize(dim);
		this.setMaximumSize( this.getPreferredSize() );
		this.setMinimumSize( this.getPreferredSize() );


		this.addActionListener(this);


		this.setText( new Integer( DEFAULT_ZOOM ) );
	}



	/**
	 * 
	 * @param e - action event
	 */
	public void actionPerformed( ActionEvent e )
	{
		super.actionPerformed(e);

		Object source = e.getSource();

		if( source.equals(this) )
		{
			if( !this.mExternalFlag )
			{
				String str = (String)this.getSelectedItem();
				final boolean auto = ( str.equals( AUTO_ZOOM_IN_COMBO_BOX ) );
				this.setAutoZoom( auto );
				if( !auto )
				{
					this.onZoomed();
				}
			}
		}

	}


	/**
	 * Current magnification value.
	 */
	private float mMagnification = DEFAULT_ZOOM;


	// set auto zoom flag to all zoomable objects
	private void setAutoZoom( final boolean b )
	{
		ArrayList list = this.mZoomableList;
		for( int ii=0; ii<list.size(); ii++ )
		{
			SGIZoomable l = (SGIZoomable)list.get(ii);
			l.setAutoZoom(b);
		}
	}



	/**
	 * Set the value to the combo box.
	 * @param num - the magnification
	 */
	public void setZoomValue( Number num )
	{
		if( num==null )
		{
			throw new IllegalArgumentException("num==null");
		}

		// set the flag true
		this.mExternalFlag = true;

		// set the text
		this.setText( num );

		// set the flag false
		this.mExternalFlag = false;
	}


	// a flag to controll the event handling
	private boolean mExternalFlag = false;



	/**
	 * Called in action event handler method.
	 */
	private void onZoomed()
	{
		
		// get the selected value
		String str = (String)this.getSelectedItem();

		// current magnification value
		Number present = new Integer( (int)(this.mMagnification*100.0f) );


		// parse the string
		Number num = SGUtilityText.getFloat(str);
		if( num==null )
		{
			num = this.parse(str);

			// when failed to parse, set the current value
			if( num==null )
			{
				num = present;
			}
		}


		// check the range
		float cl = num.floatValue();
		Number numNew;
		if( cl < 0.0 )
		{
			numNew = present;
		}
		else
		{
			if( cl < MIN_MAGNIFICATION_VALUE )
			{
				numNew = new Integer( MIN_MAGNIFICATION_VALUE );
			}
			else if( cl > MAX_MAGNIFICATION_VALUE )
			{
				numNew = new Integer( MAX_MAGNIFICATION_VALUE );
			}
			else
			{
				numNew = new Integer( (int)cl );
			}
		}


		// set the text
		this.setText( numNew );


		// set current value
		this.mMagnification = numNew.floatValue()/100.0f;


		// zoom all zoomable objects
		this.zoom( this.mMagnification );

	}



	// parse the text
	private Float parse( String text )
	{
		Float num = null;
		if( text.endsWith( PERCENT ) )
		{
			String str = text.substring(0,text.length()-1);
			ArrayList list = new ArrayList();
			// str is not read from data file
			if( SGUtilityText.tokenize( str, list, false ) == false )
			{
				return null;
			}
			
			if( list.size()!=1 )
			{
				return null;
			}

			String str0 = (String)list.get(0);
			num = SGUtilityText.getFloat(str0);
		}
		
		return num;
	}


	// set text to the combo box
	private void setText( final Number num )
	{
		String text = num.toString();
		text += PERCENT;
		this.setSelectedItem( text );
	}



	/**
	 * The list of zoomable objects.
	 */
	private final ArrayList mZoomableList = new ArrayList();


	/**
	 * Add a zoomable object.
	 * @param obj - a zoomable object
	 */
	public void addZoomable( SGIZoomable obj )
	{
		this.mZoomableList.add(obj);
	}
	
	
	/**
	 * Remove a zoomable object.
	 * @param obj - a zoomable object
	 */
	public void removeZoomable( SGIZoomable obj )
	{
		this.mZoomableList.remove(obj);
	}


	// zoom all zoomable objects.
	private void zoom( final float mag )
	{
		ArrayList list = this.mZoomableList;
		for( int ii=0; ii<list.size(); ii++ )
		{
			SGIZoomable l = (SGIZoomable)list.get(ii);
			l.zoom( mag );
		}
	}

}

