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98 lines
2.7 KiB
Java
98 lines
2.7 KiB
Java
Demonstrating a programmer-defined layout manager
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import java.applet.Applet;
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import java.awt.*;
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public class UserLayout extends Applet {
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private Choice cb1, cb2;
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private Button b1, b2, b3;
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public void init()
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{
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// use the v layout manager
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setLayout( new VLayout() );
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cb1 = new Choice();
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cb1.addItem( "Item 1" );
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cb1.addItem( "Item 2" );
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cb2 = new Choice();
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cb2.addItem( "Choice 1" );
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cb2.addItem( "Choice 2" );
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b1 = new Button( "Button 1" );
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b2 = new Button( "Button 2" );
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b3 = new Button( "Button 3" );
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// order is important
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add( cb1 );
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add( b1 );
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add( b2 );
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add( b3 );
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add( cb2 );
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}
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}
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// create class for user defined layout
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class VLayout implements LayoutManager {
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public void layoutContainer( Container c )
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{
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int numberOfComponents = c.countComponents();
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if ( numberOfComponents > 5 )
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numberOfComponents = 5;
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Insets i = c.insets();
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int w = c.size().width - i.left - i.right;
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int h = c.size().height - i.bottom - i.top;
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int x = 0, y = 0;
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// calculate x and y values for each component
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for ( int j = 0; j < numberOfComponents; j++ ) {
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Component comp = c.getComponent( j );
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Dimension d = comp.preferredSize();
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switch ( j ) {
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case 0: // first component
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x = ( int ) ( 0.2 * w );
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y = ( int ) ( 0.25 * h );
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break;
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case 1: // second component
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x = ( int ) ( 0.3 * w );
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y = ( int ) ( 0.5 * h );
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break;
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case 2: // third component
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x = ( int ) ( 0.4 * w );
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y = ( int ) ( 0.75 * h );
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break;
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case 3: // fourth component
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x = ( int ) ( 0.5 * w );
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y = ( int ) ( 0.5 * h );
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break;
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case 4: // fifth component
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x = ( int ) ( 0.6 * w );
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y = ( int ) ( 0.25 * h );
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break;
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}
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// size the component
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comp.reshape( x, y, d.width, d.height );
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}
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}
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// These last four methods must be overridden
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// However our layout manager does not use them
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public void addLayoutComponent( String s, Component c )
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{ } // empty
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public void removeLayoutComponent( Component c )
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{ } // empty
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public Dimension preferredLayoutSize( Container c )
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{ return minimumLayoutSize( c ); }
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public Dimension minimumLayoutSize( Container c )
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{ return new Dimension( 0, 0 ); }
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}
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