Mega Code Archive
Scroll a widget into view on focus in
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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.SWT;
import org.eclipse.swt.custom.ScrolledComposite;
import org.eclipse.swt.graphics.Point;
import org.eclipse.swt.graphics.Rectangle;
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.Display;
import org.eclipse.swt.widgets.Event;
import org.eclipse.swt.widgets.Listener;
import org.eclipse.swt.widgets.Shell;
/*
* Scroll a widget into view on focus in
*
* For a list of all SWT example snippets see
* http://www.eclipse.org/swt/snippets/
*
* @since 3.0
*/
public class ScrollWidgetViewFocusIn {
public static void main(String[] args) {
Display display = new Display();
Shell shell = new Shell(display);
shell.setLayout(new GridLayout());
Button b1 = new Button(shell, SWT.PUSH);
b1.setText("top");
b1.setLayoutData(new GridData(SWT.FILL, SWT.CENTER, false, false, 1, 1));
final ScrolledComposite sc = new ScrolledComposite(shell, SWT.BORDER | SWT.H_SCROLL
| SWT.V_SCROLL);
sc.setLayoutData(new GridData(SWT.FILL, SWT.FILL, true, true, 1, 1));
Composite c = new Composite(sc, SWT.NONE);
c.setLayout(new GridLayout(10, true));
for (int i = 0; i < 300; i++) {
Button b = new Button(c, SWT.PUSH);
b.setText("Button " + i);
}
Button b2 = new Button(shell, SWT.PUSH);
b2.setText("bottom");
b2.setLayoutData(new GridData(SWT.FILL, SWT.CENTER, false, false, 1, 1));
sc.setContent(c);
sc.setExpandHorizontal(true);
sc.setExpandVertical(true);
sc.setMinSize(c.computeSize(SWT.DEFAULT, SWT.DEFAULT));
Listener listener = new Listener() {
public void handleEvent(Event e) {
Control child = (Control) e.widget;
Rectangle bounds = child.getBounds();
Rectangle area = sc.getClientArea();
Point origin = sc.getOrigin();
if (origin.x > bounds.x)
origin.x = Math.max(0, bounds.x);
if (origin.y > bounds.y)
origin.y = Math.max(0, bounds.y);
if (origin.x + area.width < bounds.x + bounds.width)
origin.x = Math.max(0, bounds.x + bounds.width - area.width);
if (origin.y + area.height < bounds.y + bounds.height)
origin.y = Math.max(0, bounds.y + bounds.height - area.height);
sc.setOrigin(origin);
}
};
Control[] controls = c.getChildren();
for (int i = 0; i < controls.length; i++) {
controls[i].addListener(SWT.Activate, listener);
}
shell.setSize(300, 500);
shell.open();
while (!shell.isDisposed()) {
if (!display.readAndDispatch())
display.sleep();
}
display.dispose();
}
}
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