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| 17. 49. 18. 创建一个表1,000,000项目(懒惰，页面大小64 ) |
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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;
/*
* Virtual Table example snippet: create a table with 1,000,000 items (lazy, page size 64)
*
* For a list of all SWT example snippets see
* http://www.eclipse.org/swt/snippets/
*
* @since 3.0
*/
import org.eclipse.swt.SWT;
import org.eclipse.swt.layout.RowData;
import org.eclipse.swt.layout.RowLayout;
import org.eclipse.swt.widgets.Display;
import org.eclipse.swt.widgets.Event;
import org.eclipse.swt.widgets.Listener;
import org.eclipse.swt.widgets.Shell;
import org.eclipse.swt.widgets.Table;
import org.eclipse.swt.widgets.TableItem;
public class TableWithPageSize {
static final int PAGE_SIZE = 64;
static final int COUNT = 100000;
public static void main(String[] args) {
Display display = new Display();
final Shell shell = new Shell(display);
shell.setLayout(new RowLayout(SWT.VERTICAL));
final Table table = new Table(shell, SWT.VIRTUAL | SWT.BORDER);
table.addListener(SWT.SetData, new Listener() {
public void handleEvent(Event event) {
TableItem item = (TableItem) event.item;
int index = table.indexOf(item);
int start = index / PAGE_SIZE * PAGE_SIZE;
int end = Math.min(start + PAGE_SIZE, table.getItemCount());
for (int i = start; i < end; i++) {
item = table.getItem(i);
item.setText("Item " + i);
}
}
});
table.setLayoutData(new RowData(200, 200));
long t1 = System.currentTimeMillis();
table.setItemCount(COUNT);
long t2 = System.currentTimeMillis();
System.out.println("Items: " + COUNT + ", Time: " + (t2 - t1) + " (ms) [page=" + PAGE_SIZE
+ "]");
shell.layout();
shell.pack();
shell.open();
while (!shell.isDisposed()) {
if (!display.readAndDispatch())
display.sleep();
}
display.dispose();
}
}
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