Examples of org.locationtech.udig.ui.filter.ExpressionViewer$ExpressionViewerFactoryContributionItem

org.locationtech.udig.ui.filter.ExpressionViewer
{@link IExpressionViewer} allowing user to switch between implementations.
Note this implementation makes use of {@link ExpressionViewerFactory} when creating each viewer. We ask thatyou remember the "viewerId" in dialog settings or IMento so the user is not forced to choose which viewer is displayed each time. You can also use this facility as a hint when configuring the viewer for use.
```
 ExpressionViewer viewer = new ExpressionViewer(composite, SWT.MULTI); viewer.getControl().setLayoutData("grow, gap unrelated"); 
```
You will need to consult the extension point for the list of valid viewerIds. @author Jody Garnett @since 1.3.2

        
        final Label exLabel = new Label(page, SWT.NONE);
        exLabel.setText(Messages.InfoPropertyPage_labelExpression);
        exLabel.setLayoutData(""); //$NON-NLS-1$
        
        exViewer = new ExpressionViewer(page, SWT.MULTI);
        exViewer.getControl().setLayoutData("h 100%!, w 100%!"); //$NON-NLS-1$
        final ExpressionInput exInput = new ExpressionInput(getSchema());
        exInput.setBinding(String.class);
        exViewer.setInput(exInput);
        exViewer.refresh();

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        name = new Text(this, SWT.SINGLE | SWT.BORDER);
        name.setEditable(true);
        name.setText("");
        name.setLayoutData("cell 0 7 2 1");


        expression = new ExpressionViewer(this, SWT.MULTI);
        // expression.setInput(expressionInput);
        expression.getControl()
                .setLayoutData("cell 0 8 2 1,height 200:50%:50%,width 300:pref:100%");
        expression.addSelectionChangedListener(expressionListener);

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