/* File JavaExamples/Caviness/CheckboxTest.java
 *
 * This software adapted from Horstmann & Cornell, "Core Java Volume 1-
 * Fundamentals," pp.384-386.
 *
 * 28 October 1997 (Caviness); 23 Nov 1998 (Erich Kaltofen EK)
 */

/**
 * This example application demonstrates the use of the JDK component 
 * Checkbox.  It displays a message and two check boxes that can be used
 * to toggle the font used in the message between bold and non-bold and
 * italic and non-italic.  Both, one, or none can turned on.
 */

import java.awt.*;

public class CheckboxTest extends Frame{
    // EK: Hierarchy Component-->Container-->Window-->Frame-->CheckboxTest
    //     contains 2 Panel's: font and radio
    //                         font contains two Checkbox's labeled Bold and Italic
    //                         radio contains a CheckboxGroup of four Checkboxes

    private FoxCanvas fox;
    private Checkbox bold;
    private Checkbox italic;

    final int small      = 8;	// Font sizes
    final int medium     = 12;
    final int large      = 14;
    final int extraLarge = 18;

    public CheckboxTest( String title ){
        super( title );			// Set frame title; EK: Frame(String)

        Panel font = new Panel();	      // A panel to hold the check boxes
        font.add( new Label( "Font Style" ) );// for font styles; EK: Container.add
        bold = addCheckbox( font,"Bold" );    // EK: CheckboxTest.addCheckbox
        italic = addCheckbox( font, "Italic" );

        Panel radio = new Panel();		// Panel for radio buttons 
        radio.add( new Label( "Font Size" ) );  // for font size
        CheckboxGroup fontSizeGrp = new CheckboxGroup();
        Checkbox smallRB = addRadiobox( radio,"Small",fontSizeGrp,false );
                           // EK: CheckboxTest.addRadiobox(...)
        Checkbox medRB = addRadiobox( radio,"Medium",fontSizeGrp,true );
        Checkbox largeRB = addRadiobox( radio,"Large",fontSizeGrp,false );
        Checkbox exlargeRB = addRadiobox(radio,"ExtraLarge",fontSizeGrp,false);

        setLayout( new BorderLayout() ); // Layout frame; EK: Container.setLayout
        add( font,"North" );  // EK: Container.add(...)
        add( radio, "South" );
        fox = new FoxCanvas();
        add( fox,"Center" );
        pack(); // EK: Frame.pack()
    } // end CheckboxTest(String)

    /*
     * Auxillary functions used by the constructor.
     */
    public Checkbox addRadiobox( Panel p, String name, 
                                 CheckboxGroup g, boolean on ){
        Checkbox c = new Checkbox( name,g,on );
        p.add( c );  // EK: Container.add(...)
        return c;
    }
    public Checkbox addCheckbox( Panel p, String name ){
        Checkbox c = new Checkbox( name );
        p.add( c );
        return c;
    }

    public static void main( String arg[] ){
        CheckboxTest f = new CheckboxTest( "Checkbox Test" );
        f.show(); // Window.show()
    }

    /*
     *  EK: handleEvent overrides Component.handleEvent(Event)
     */
    public boolean handleEvent(Event evt){
    if ( evt.target == this ) // catch Toolkit actions on Frame
       { System.out.println( "CheckboxTest.handleEvent() w evt = " + evt );
         if ( evt.id == Event.WINDOW_DESTROY )
            { this.dispose(); System.exit(0); }
       }
    return super.handleEvent(evt); // Component.handleEvent
    } // end handleEvent

    /*
     *  action overrides Component.action(...).  action is deprecated in 
     *  JDK 1.1 by the new event handling paradigm.
     */
    public boolean action( Event e, Object obj ){
        System.out.println( "CheckboxTest.action() w e = " + e + 
                            ", obj = " + obj );
        if ( e.target instanceof Checkbox ){
            Checkbox box = (Checkbox)e.target;
            String label = box.getLabel();
            if ( label.equals("Bold") || label.equals("Italic") ){
                int style = ( bold.getState() ? Font.BOLD : 0 ) +
                            ( italic.getState() ? Font.ITALIC : 0 );
                fox.setFontStyle( style );               
                return true;
            }
            if ( label.equals( "Small" ) ){
                fox.setFontSize( small );
                return true;
            }
            if ( label.equals( "Medium" ) ){
                fox.setFontSize( medium );
                return true;
            }
            if ( label.equals( "Large" ) ){
                fox.setFontSize( large );
                return true;
            }
            if ( label.equals( "ExtraLarge" ) ){
                fox.setFontSize( extraLarge );
                return true;
            }
        }
        return false;
    } // end CheckboxTest.action(...)
} // end class CheckboxTest

class FoxCanvas extends Canvas{
   // EK: hierarchy Component-->Canvas-->FoxCanvas

    private int style;
    private int pointSize;

    public FoxCanvas(){
        style = Font.PLAIN; // EK: FoxCanvas.style
        pointSize = 12;     // EK: FoxCanvas.pointSize
        setFont();          // EK: FoxCanvas.setFont()
        setSize( 200, 50 ); // EK: Component.setSize(...)
    }
   
    public void setFont(){
        setFont( new Font( "SansSerif",style,pointSize ) );
               // EK: Component.setFont(Font)
        repaint(); // EK: Component.repaint()
    }

    public void setFontStyle( int style ){
        this.style = style;
        setFont();
    }

    public void setFontSize( int pointSize ){
        this.pointSize = pointSize;
        setFont();
    }

    public void paint( Graphics g ){
    // overrides Component.paint(); executed by Component.update()
    //                              which is invoked by Component.repaint()
        g.drawString( "The quick brown fox jumps over the lazy dog.", 10, 25);
    }
} // end class FoxCanvas