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/*******************************************************************************
* Copyright (c) 2000, 2005 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
* http://www.eclipse.org/legal/epl-v10.html
*
* Contributors:
* IBM Corporation - initial API and implementation
*******************************************************************************/
package org.eclipse.swt.snippets;
import org.eclipse.swt.*;
import org.eclipse.swt.graphics.*;
import org.eclipse.swt.layout.*;
import org.eclipse.swt.widgets.*;
/*
* Detect when the user scrolls a text control
*
* For a list of all SWT example snippets see
* http://www.eclipse.org/swt/snippets/
*/
public class Snippet191 {
public static void main(String[] args) {
Display display = new Display ();
Shell shell = new Shell (display);
shell.setLayout (new FillLayout ());
final Text text = new Text (shell, SWT.BORDER | SWT.H_SCROLL | SWT.V_SCROLL);
for (int i=0; i<32; i++) {
text.append (i + "-This is a line of text in a widget-" + i + "\n");
}
text.setSelection (0);
Listener listener = new Listener () {
int lastIndex = text.getTopIndex ();
public void handleEvent (Event e) {
int index = text.getTopIndex ();
if (index != lastIndex) {
lastIndex = index;
System.out.println ("Scrolled, topIndex=" + index);
}
}
};
/* NOTE: Only detects scrolling by the user */
text.addListener (SWT.MouseDown, listener);
text.addListener (SWT.MouseMove, listener);
text.addListener (SWT.MouseUp, listener);
text.addListener (SWT.KeyDown, listener);
text.addListener (SWT.KeyUp, listener);
text.addListener (SWT.Resize, listener);
ScrollBar hBar = text.getHorizontalBar();
if (hBar != null) {
hBar.addListener (SWT.Selection, listener);
}
ScrollBar vBar = text.getVerticalBar();
if (vBar != null) {
vBar.addListener (SWT.Selection, listener);
}
shell.pack ();
Point size = shell.computeSize (SWT.DEFAULT, SWT.DEFAULT);
shell.setSize (size. x - 32, size.y / 2);
shell.open ();
while (!shell.isDisposed ()) {
if (!display.readAndDispatch ()) display.sleep ();
}
display.dispose ();
}
}
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