org.eclipse.jdt.debug.ui/ui/org/eclipse/jdt/internal/debug/ui/WatchExpressionDialog.java

package org.eclipse.jdt.internal.debug.ui;

/**********************************************************************
Copyright (c) 2002 IBM Corp. and others.
All rights reserved. This program and the accompanying materials
are made available under the terms of the Common Public License v1.0
which accompanies this distribution, and is available at
http://www.eclipse.org/legal/cpl-v10.html

Contributors:
	IBM Corporation - Initial implementation
**********************************************************************/

import org.eclipse.jdt.internal.ui.JavaPlugin;
import org.eclipse.jdt.internal.ui.dialogs.StatusDialog;
import org.eclipse.jdt.internal.ui.dialogs.StatusInfo;
import org.eclipse.jdt.ui.text.JavaSourceViewerConfiguration;
import org.eclipse.jdt.ui.text.JavaTextTools;
import org.eclipse.jface.resource.JFaceResources;
import org.eclipse.jface.text.Document;
import org.eclipse.jface.text.DocumentEvent;
import org.eclipse.jface.text.IDocument;
import org.eclipse.jface.text.IDocumentListener;
import org.eclipse.jface.text.IDocumentPartitioner;
import org.eclipse.swt.SWT;
import org.eclipse.swt.graphics.Font;
import org.eclipse.swt.layout.GridData;
import org.eclipse.swt.layout.GridLayout;
import org.eclipse.swt.widgets.Button;
import org.eclipse.swt.widgets.Composite;
import org.eclipse.swt.widgets.Control;
import org.eclipse.swt.widgets.Label;
import org.eclipse.swt.widgets.Shell;

/**
 * Dialog for edit watch expression.
 */
public class WatchExpressionDialog extends StatusDialog {

	/**
	 * The detail formatter to edit.
	 */
	private JavaWatchExpression fWatchExpression;

	// widgets
	private JDISourceViewer fSnippetViewer;
	private Button fCheckBox;

	public WatchExpressionDialog(Shell parent, JavaWatchExpression watchExpression, boolean editDialog) {
		super(parent);
		fWatchExpression= watchExpression;
		setShellStyle(getShellStyle() | SWT.MAX | SWT.RESIZE);
		if (editDialog) {
			setTitle(DebugUIMessages.getString("WatchExpressionDialog.Edit_Watch_Expression_1")); //$NON-NLS-1$
		} else {
			setTitle(DebugUIMessages.getString("WatchExpressionDialog.Add_Watch_Expression_2")); //$NON-NLS-1$
		}
	}

	/**
	 * Create the dialog area.
	 *
	 * @see org.eclipse.jface.dialogs.Dialog#createDialogArea(Composite)
	 */
	protected Control createDialogArea(Composite parent) {
		Font font = parent.getFont();
		
		Composite container = new Composite(parent, SWT.NONE);
		GridLayout layout = new GridLayout();
		container.setLayout(layout);
		GridData gd= new GridData(GridData.FILL_BOTH);
		container.setLayoutData(gd);

		// snippet label
		Label label= new Label(container, SWT.NONE);
		label.setText(DebugUIMessages.getString("WatchExpressionDialog.E&xpression_3")); //$NON-NLS-1$
		gd= new GridData(GridData.BEGINNING);
		label.setLayoutData(gd);
		label.setFont(font);

		// snippet viewer
		fSnippetViewer= new JDISourceViewer(container,  null, SWT.BORDER | SWT.V_SCROLL | SWT.H_SCROLL );
		fSnippetViewer.setInput(this);

		JavaTextTools tools= JavaPlugin.getDefault().getJavaTextTools();
		IDocument document= new Document();
		IDocumentPartitioner partitioner= tools.createDocumentPartitioner();
		document.setDocumentPartitioner(partitioner);
		partitioner.connect(document);
		fSnippetViewer.configure(new JavaSourceViewerConfiguration(JavaPlugin.getDefault().getJavaTextTools(), null));
		fSnippetViewer.setEditable(true);
		fSnippetViewer.setDocument(document);
		document.addDocumentListener(new IDocumentListener() {
			public void documentAboutToBeChanged(DocumentEvent event) {
			}
			public void documentChanged(DocumentEvent event) {
				checkValues();
			}
		});

		fSnippetViewer.getTextWidget().setFont(JFaceResources.getTextFont());

		Control control= fSnippetViewer.getControl();
		gd= new GridData(GridData.FILL_BOTH);
		gd.heightHint= convertHeightInCharsToPixels(10);
		gd.widthHint= convertWidthInCharsToPixels(80);
		control.setLayoutData(gd);
		document.set(fWatchExpression.getExpressionText());

		// enable checkbox
		fCheckBox= new Button(container, SWT.CHECK | SWT.LEFT);
		fCheckBox.setText(DebugUIMessages.getString("WatchExpressionDialog.&Enable_4")); //$NON-NLS-1$
		fCheckBox.setSelection(fWatchExpression.isEnabled());
		fCheckBox.setFont(font);

		applyDialogFont(container);
		fSnippetViewer.getControl().setFocus();
		return container;
	}

	/**
	 * @see org.eclipse.jface.dialogs.Dialog#okPressed()
	 */
	protected void okPressed() {
		fWatchExpression.setEnabled(fCheckBox.getSelection());
		fWatchExpression.setExpressionText(fSnippetViewer.getDocument().get());
		super.okPressed();
	}
	
	/**
	 * Check the field values and display a message in the status if needed.
	 */
	private void checkValues() {
		StatusInfo status= new StatusInfo();
		if (fSnippetViewer.getDocument().get().trim().length() == 0) {
			status.setError(DebugUIMessages.getString("WatchExpressionDialog.Expression_must_not_be_empty_5")); //$NON-NLS-1$
		}
		updateStatus(status);
	}

}