FileDocCategorySizeDatePackage
ColourChooser.javaAPI DocExample6241Thu Feb 03 08:18:02 GMT 2000None

ColourChooser

public class ColourChooser extends Dialog implements ActionListener, AdjustmentListener

Fields Summary
private Frame
parent
private Color
oldBkg
private Canvas
disp
private Label
redL
private Label
greenL
private Label
blueL
private Scrollbar
redSB
private Scrollbar
greenSB
private Scrollbar
blueSB
private int
red
private int
green
private int
blue
Constructors Summary
public ColourChooser(Frame f, boolean m)

  super( f, "Colour Chooser", m );  // pass to parent.

      // save reference to parent

      parent = f;

      // and current background colour

      oldBkg = f.getBackground();

      

      // Controls and labels to add to West of Dialog

      Panel p = new Panel();

      p.setLayout( new BorderLayout() );

      

      // Labels

      Panel ppN = new Panel();

      ppN.setLayout( new GridLayout( 1, 3 ) );

      ppN.add( redL );

      ppN.add( greenL );

      ppN.add( blueL );

      p.add( "North", ppN );

      

      // Scrollbars

      Panel ppC = new Panel();

      ppC.setLayout( new GridLayout( 1, 3 ) );

      redSB.setValues( 127, 1, 0, 256 );

      redSB.setBlockIncrement( 8 );

      redSB.addAdjustmentListener( this );

      ppC.add( redSB );



      greenSB.setValues( 127, 1, 0, 256 );

      greenSB.setBlockIncrement( 8 );

      greenSB.addAdjustmentListener( this );

      ppC.add( greenSB );



      blueSB.setValues( 127, 1, 0, 256 );

      blueSB.setBlockIncrement( 8 );

      blueSB.addAdjustmentListener( this );

      ppC.add( blueSB );

      

      p.add( "Center", ppC );



      Panel ppS = new Panel();

      ppS.setLayout( new GridLayout( 1, 3 ) );

      ppS.add( new Label( "R", Label.CENTER ) );

      ppS.add( new Label( "G", Label.CENTER ) );

      ppS.add( new Label( "B", Label.CENTER ) );

      p.add( "South", ppS );

      

      add( "West", p );

      

      // Canvas that is used to show current colour

      disp.setSize( 50, 150 );

      add( "Center", disp );



      // buttons to control interaction with parent

      Panel buttons = new Panel();

      Button dismiss = new Button( "Close" );

      dismiss.addActionListener( this );

      buttons.add( dismiss );

      Button apply = new Button( "Apply" );

      apply.addActionListener( this );

      buttons.add( apply );

      Button cancel = new Button( "Cancel" );

      cancel.addActionListener( this );

      buttons.add( cancel );

      

      add( "South", buttons );

      

      // ensure that disp has corrent colour

      setColour();



      pack();

      setVisible( true );
Methods Summary
public voidactionPerformed(java.awt.event.ActionEvent e)

  String label = e.getActionCommand();

      if( label.equals( "Close" ) )

      {  setVisible( false ); // disappear and cease

         dispose();   // release resources

      }

      if( label.equals( "Apply" ) )

      {  parent.setBackground( new Color( red, green, blue ) );

         parent.repaint(); // update parent

      }

      if( label.equals( "Cancel" ) )

      {  parent.setBackground( oldBkg ); // restore 

         parent.repaint(); // original parent colour

         setVisible( false );

         dispose();

      }
public voidadjustmentValueChanged(java.awt.event.AdjustmentEvent e)

  if( e.getAdjustable() instanceof Scrollbar )

      // get the actual Scrollbar responsible for this change

      {  Scrollbar s = (Scrollbar)(e.getAdjustable() );

         int value = 255-e.getValue(); // 0 at top!

         if( s == redSB )

         {  red = value;

            redL.setText( "" + value );

         }

         if( s == greenSB )

         {  green = value;

            greenL.setText( "" + value );

         }

         if( s == blueSB )

         {  blue = value;

            blueL.setText( "" + value );

         }

         setColour(); // update disp

      }
private voidsetColour()

  Color c = new Color( red, green, blue );

      disp.setBackground( c );

      disp.repaint();