Last active
December 7, 2025 14:55
-
-
Save rherrmann/b1a2a633cd4c9b607fe7 to your computer and use it in GitHub Desktop.
SWT ScrolledComposite Examples to accompany this article: http://www.codeaffine.com/2016/03/01/swt-scrolledcomposite/
This file contains hidden or bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
| package com.codeaffine.scrolledcomposite; | |
| import org.eclipse.swt.SWT; | |
| import org.eclipse.swt.custom.CLabel; | |
| import org.eclipse.swt.custom.ScrolledComposite; | |
| import org.eclipse.swt.layout.FillLayout; | |
| import org.eclipse.swt.widgets.Display; | |
| import org.eclipse.swt.widgets.Shell; | |
| /** | |
| * Brings face to face a ScrolledComposite with fixed content and, on the right side, a ScrolledComposite with expanding content. | |
| */ | |
| public class FixedVersusExpandingContent { | |
| private static final int STYLE = SWT.BORDER | SWT.H_SCROLL | SWT.V_SCROLL; | |
| public static void main( String[] args ) { | |
| Display display = new Display(); | |
| Shell shell = new Shell( display ); | |
| shell.setText( "ScrolledComposite in 'scroll' and 'browser' mode" ); | |
| shell.setLayout( new FillLayout() ); | |
| ScrolledComposite leftSC = new ScrolledComposite( shell, STYLE ); | |
| CLabel leftLabel = new CLabel( leftSC, SWT.NONE ); | |
| leftLabel.setBackground( display.getSystemColor( SWT.COLOR_DARK_GREEN ) ); | |
| leftLabel.setForeground( display.getSystemColor( SWT.COLOR_WHITE ) ); | |
| String leftText | |
| = "Fixed size content.\n\n" | |
| + "Scrollbars appear if the\n" | |
| + "ScrolledComposite\nis resized to be too small\n" | |
| + "to show the entire content."; | |
| leftLabel.setText( leftText ); | |
| leftLabel.setAlignment( SWT.CENTER ); | |
| leftLabel.setSize( 250, 250 ); | |
| leftSC.setContent( leftLabel ); | |
| ScrolledComposite rightSC = new ScrolledComposite( shell, STYLE ); | |
| CLabel rightLabel = new CLabel( rightSC, SWT.NONE ); | |
| String rightText | |
| = "Expanding content.\n\n" | |
| + "The content has a minimum size.\n" | |
| + "If the ScrolledComposite is\n" | |
| + "resized bigger than the minimum size,\n" | |
| + "the content will grow in size.\n" | |
| + "If the ScrolledComposite is made too small\n" | |
| + "to show the minimum size, scrollbars will appear."; | |
| rightLabel.setText( rightText ); | |
| rightLabel.setBackground( display.getSystemColor( SWT.COLOR_DARK_GRAY ) ); | |
| rightLabel.setForeground( display.getSystemColor( SWT.COLOR_WHITE ) ); | |
| rightLabel.setAlignment( SWT.CENTER ); | |
| rightSC.setContent( rightLabel ); | |
| rightSC.setExpandHorizontal( true ); | |
| rightSC.setExpandVertical( true ); | |
| rightSC.setMinSize( 250, 250 ); | |
| shell.setSize( 600, 300 ); | |
| shell.open(); | |
| while( !shell.isDisposed() ) { | |
| if( !display.readAndDispatch() ) | |
| display.sleep(); | |
| } | |
| display.dispose(); | |
| } | |
| } |
This file contains hidden or bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
| package com.codeaffine.scrolledcomposite; | |
| import org.eclipse.swt.SWT; | |
| import org.eclipse.swt.custom.ScrolledComposite; | |
| import org.eclipse.swt.graphics.Point; | |
| import org.eclipse.swt.layout.GridData; | |
| import org.eclipse.swt.layout.GridLayout; | |
| import org.eclipse.swt.widgets.Composite; | |
| import org.eclipse.swt.widgets.Display; | |
| import org.eclipse.swt.widgets.Label; | |
| import org.eclipse.swt.widgets.Shell; | |
| import org.eclipse.swt.widgets.Text; | |
| /** | |
| * Shows an expanding ScrolledComposite that scrolls only vertically. | |
| */ | |
| public class VerticallyScrolledForm { | |
| public static void main( String[] args ) { | |
| new VerticallyScrolledForm().run(); | |
| } | |
| private Shell shell; | |
| private ScrolledComposite scrolledComposite; | |
| void run() { | |
| createControls(); | |
| layoutControls(); | |
| openShell(); | |
| runEventLoop(); | |
| } | |
| private void createControls() { | |
| shell = new Shell( new Display() ); | |
| shell.setText( "Contact Details Form" ); | |
| shell.addListener( SWT.Dispose, event -> event.display.dispose() ); | |
| scrolledComposite = new ScrolledComposite( shell, SWT.V_SCROLL ); | |
| Composite content = createForm(); | |
| scrolledComposite.setContent( content ); | |
| scrolledComposite.setExpandVertical( true ); | |
| scrolledComposite.setExpandHorizontal( true ); | |
| scrolledComposite.addListener( SWT.Resize, event -> { | |
| int width = scrolledComposite.getClientArea().width; | |
| scrolledComposite.setMinSize( content.computeSize( width, SWT.DEFAULT ) ); | |
| } ); | |
| } | |
| private void layoutControls() { | |
| shell.setLayout( new GridLayout( 1, false ) ); | |
| GridData gridData = new GridData( SWT.FILL, SWT.FILL, true, true ); | |
| gridData.heightHint = computePreferredHeight(); | |
| scrolledComposite.setLayoutData( gridData ); | |
| } | |
| private void openShell() { | |
| shell.pack(); | |
| shell.open(); | |
| } | |
| private void runEventLoop() { | |
| while( !shell.isDisposed() ) { | |
| if( !shell.getDisplay().readAndDispatch() ) { | |
| shell.getDisplay().sleep(); | |
| } | |
| } | |
| } | |
| private int computePreferredHeight() { | |
| int numberOfLines = 10; | |
| int defaultHorizontalSpacing = 5; | |
| Text text = new Text( shell, SWT.BORDER ); | |
| text.setText( "X" ); | |
| Point preferredSize = text.computeSize( SWT.DEFAULT, SWT.DEFAULT ); | |
| text.dispose(); | |
| return numberOfLines * ( preferredSize.y + defaultHorizontalSpacing ); | |
| } | |
| private Composite createForm() { | |
| Composite result = new Composite( scrolledComposite, SWT.NONE ); | |
| result.setLayout( new GridLayout( 2, false ) ); | |
| createField( result, "Title" ); | |
| createField( result, "Salutation" ); | |
| createField( result, "First name" ); | |
| createField( result, "Middle name" ); | |
| createField( result, "Last name" ); | |
| createField( result, "Maiden name" ); | |
| createField( result, "Street" ); | |
| createField( result, "Street supplement" ); | |
| createField( result, "PO Box" ); | |
| createField( result, "Zip code" ); | |
| createField( result, "City" ); | |
| createField( result, "State" ); | |
| createField( result, "Country" ); | |
| createField( result, "Private Phone" ); | |
| createField( result, "Mobile Phone" ); | |
| createField( result, "Email address" ); | |
| createField( result, "Web site" ); | |
| return result; | |
| } | |
| private static void createField( Composite parent, String labelText ) { | |
| Label label = new Label( parent, SWT.NONE ); | |
| label.setText( labelText ); | |
| Text text = new Text( parent, SWT.BORDER ); | |
| text.setLayoutData( new GridData( SWT.FILL, SWT.CENTER, true, false ) ); | |
| } | |
| } |
Author
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment
Thank you for the hint, that's indeed misleading. I've changed the name to
content.