/*******************************************************************************
* Copyright (c) 2000, 2016 IBM Corporation and others.
*
* This program and the accompanying materials
* are made available under the terms of the Eclipse Public License 2.0
* which accompanies this distribution, and is available at
* https://www.eclipse.org/legal/epl-2.0/
*
* SPDX-License-Identifier: EPL-2.0
*
* Contributors:
* IBM Corporation - initial API and implementation
*******************************************************************************/
package org.eclipse.swt.snippets;
/*
* SWT Table snippet: scroll a Table one "page" at a time.
*
* For a list of all SWT example snippets see
* http://www.eclipse.org/swt/snippets/
*/
import org.eclipse.swt.*;
import org.eclipse.swt.layout.*;
import org.eclipse.swt.widgets.*;
public class Snippet51 {
public static void main(String [] args) {
Display display = new Display();
Shell shell = new Shell(display);
shell.setBounds(10,10,300,300);
shell.setLayout(new GridLayout(2,true));
final Table table = new Table(shell, SWT.NONE);
GridData data = new GridData(GridData.FILL_BOTH);
data.horizontalSpan = 2;
table.setLayoutData(data);
for (int i = 0; i < 99; i++) {
new TableItem(table, SWT.NONE).setText("item " + i);
}
Button upButton = new Button(shell, SWT.PUSH);
upButton.setText("Scroll up one page");
upButton.setLayoutData(new GridData(SWT.FILL, SWT.FILL, true, false));
upButton.addListener(SWT.Selection, event -> {
int height = table.getClientArea().height;
int visibleItemCount = height / table.getItemHeight();
int topIndex = table.getTopIndex();
int newTopIndex = Math.max(0, topIndex - visibleItemCount);
if (topIndex != newTopIndex) {
table.setTopIndex(newTopIndex);
}
});
Button downButton = new Button(shell, SWT.PUSH);
downButton.setText("Scroll down one page");
downButton.setLayoutData(new GridData(SWT.FILL, SWT.FILL, true, false));
downButton.addListener(SWT.Selection, event -> {
int height = table.getClientArea().height;
int visibleItemCount = height / table.getItemHeight();
int topIndex = table.getTopIndex();
int newTopIndex = Math.min(table.getItemCount(), topIndex + visibleItemCount);
if (topIndex != newTopIndex) {
table.setTopIndex(newTopIndex);
}
});
shell.open();
while (!shell.isDisposed()) {
if (!display.readAndDispatch()) display.sleep();
}
display.dispose();
}
}
