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Copyright (c) 2000, 2006 IBM Corporation and others. All rights reserved. This program and the accompanying materials are made available under the terms of the Eclipse Public License v1.0 which accompanies this distribution, and is available at Contributors: IBM Corporation - initial API and implementation /
 package org.eclipse.xtext.ui.editor.tasks.dialogfields;
 import  org.eclipse.core.runtime.Assert;
 import  org.eclipse.swt.SWT;
 import  org.eclipse.swt.layout.GridData;
 import  org.eclipse.swt.widgets.Composite;
 import  org.eclipse.swt.widgets.Control;
 import  org.eclipse.swt.widgets.Display;
 import  org.eclipse.swt.widgets.Label;

Base class of all dialog fields. Dialog fields manage controls together with the model, independed from the creation time of the widgets. - support for automated layouting. - enable / disable, set focus a concept of the base class. DialogField have a label.
 public class DialogField {
 	private Label fLabel;
 	protected String fLabelText;
 	private boolean fEnabled;
 	public DialogField() {
 		 = true;
 		 = null;
 		 = ""//$NON-NLS-1$

Sets the label of the dialog field.
 	public void setLabelText(String labeltext) {
 		 = labeltext;
 		if (isOkToUse()) {
 	// ------ change listener
Defines the listener for this dialog field.
 	public final void setDialogFieldListener(IDialogFieldListener listener) {
 		 = listener;

Programatical invocation of a dialog field change.
 	public void dialogFieldChanged() {
 		if ( != null) {
 	// ------- focus management
Tries to set the focus to the dialog field. Returns true if the dialog field can take focus. To be reimplemented by dialog field implementors.
 	public boolean setFocus() {
 		return false;

Posts setFocus to the display event queue.
 	public void postSetFocusOnDialogField(Display display) {
 		if (display != null) {
 			display.asyncExec(new Runnable() {
 				public void run() {
 	// ------- layout helpers
Creates all controls of the dialog field and fills it to a composite. The composite is assumed to have MGridLayout as layout. The dialog field will adjust its controls' spans to the number of columns given. To be reimplemented by dialog field implementors.
	public Control[] doFillIntoGrid(Composite parentint nColumns) {
		Label label = getLabelControl(parent);
		return new Control[] { label };

Returns the number of columns of the dialog field. To be reimplemented by dialog field implementors.
	public int getNumberOfControls() {
		return 1;
	protected static GridData gridDataForLabel(int span) {
		GridData gd = new GridData(GridData.HORIZONTAL_ALIGN_FILL);
		gd.horizontalSpan = span;
		return gd;
	// ------- ui creation
Creates or returns the created label widget.

parent The parent composite or null if the widget has already been created.
	public Label getLabelControl(Composite parent) {
		if ( == null) {
			 = new Label(parent, SWT.LEFT | SWT.WRAP);
			if ( != null && !"".equals()) { //$NON-NLS-1$
else {
				// XXX: to avoid a 16 pixel wide empty label - revisit
				.setText("."); //$NON-NLS-1$
		return ;

Creates a spacer control.

parent The parent composite
	public static Control createEmptySpace(Composite parent) {
		return createEmptySpace(parent, 1);

Creates a spacer control with the given span. The composite is assumed to have MGridLayout as layout.

parent The parent composite
	public static Control createEmptySpace(Composite parentint span) {
		Label label = new Label(parent, SWT.LEFT);
		GridData gd = new GridData();
		gd.horizontalAlignment = GridData.BEGINNING;
		gd.grabExcessHorizontalSpace = false;
		gd.horizontalSpan = span;
		gd.horizontalIndent = 0;
		gd.widthHint = 0;
		gd.heightHint = 0;
		return label;

Tests is the control is not null and not disposed.
	protected final boolean isOkToUse(Control control) {
		return (control != null) && (Display.getCurrent() != null)
				&& !control.isDisposed();
	// --------- enable / disable management
Sets the enable state of the dialog field.
	public final void setEnabled(boolean enabled) {
		if (enabled != ) {
			 = enabled;

Called when the enable state changed. To be extended by dialog field implementors.
	protected void updateEnableState() {
		if ( != null) {

Brings the UI in sync with the model. Only needed when model was changed in different thread whil UI was lready created.
	public void refresh() {

Gets the enable state of the dialog field.
	public final boolean isEnabled() {
		return ;
	protected final void assertCompositeNotNull(Composite comp) {
				"uncreated control requested with composite null"); //$NON-NLS-1$
	protected final void assertEnoughColumns(int nColumns) {
		Assert.isTrue(nColumns >= getNumberOfControls(),
				"given number of columns is too small"); //$NON-NLS-1$
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