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/*******************************************************************************
* Copyright (c) 2006, 2014 Tom Schindl 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:
* Tom Schindl - initial API and implementation
* Lars Vogel <Lars.Vogel@gmail.com> - Bug 414565
*******************************************************************************/
package org.eclipse.jface.snippets.viewers;
import org.eclipse.jface.viewers.ILazyContentProvider;
import org.eclipse.jface.viewers.LabelProvider;
import org.eclipse.jface.viewers.TableViewer;
import org.eclipse.jface.viewers.Viewer;
import org.eclipse.swt.SWT;
import org.eclipse.swt.layout.FillLayout;
import org.eclipse.swt.widgets.Display;
import org.eclipse.swt.widgets.Shell;
import org.eclipse.swt.widgets.Table;
import org.eclipse.swt.widgets.TableColumn;
/**
* A simple TableViewer to demonstrate usage of an ILazyContentProvider. You can
* compare this snippet to the Snippet029VirtualTableViewer to see the small but
* needed difference.
*
*/
public class Snippet030VirtualLazyTableViewer {
private static class MyContentProvider implements ILazyContentProvider {
private TableViewer viewer;
private MyModel[] elements;
public MyContentProvider(TableViewer viewer) {
this.viewer = viewer;
}
@Override
public void dispose() {
}
@Override
public void inputChanged(Viewer viewer, Object oldInput, Object newInput) {
this.elements = (MyModel[]) newInput;
}
@Override
public void updateElement(int index) {
viewer.replace(elements[index], index);
}
}
public static class MyModel {
public int counter;
public MyModel(int counter) {
this.counter = counter;
}
@Override
public String toString() {
return "Item " + this.counter;
}
}
public Snippet030VirtualLazyTableViewer(Shell shell) {
final TableViewer v = new TableViewer(shell, SWT.VIRTUAL);
v.setLabelProvider(new LabelProvider());
v.setContentProvider(new MyContentProvider(v));
v.setUseHashlookup(true);
createColumn(v.getTable(), "Column 1");
MyModel[] model = createModel();
v.setInput(model);
v.setItemCount(model.length); // This is the difference when using a
// ILazyContentProvider
v.getTable().setLinesVisible(true);
}
public void createColumn(Table tb, String text) {
TableColumn column = new TableColumn(tb, SWT.NONE);
column.setWidth(100);
column.setText(text);
tb.setHeaderVisible(true);
}
private MyModel[] createModel() {
MyModel[] elements = new MyModel[10000];
for (int i = 0; i < 10000; i++) {
elements[i] = new MyModel(i);
}
return elements;
}
public static void main(String[] args) {
Display display = new Display();
Shell shell = new Shell(display);
shell.setLayout(new FillLayout());
new Snippet030VirtualLazyTableViewer(shell);
shell.open();
while (!shell.isDisposed()) {
if (!display.readAndDispatch())
display.sleep();
}
display.dispose();
}
}
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