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/*******************************************************************************
* Copyright (c) 2011 IBM Corporation and others.
* All rights reserved. This Example Content is intended to demonstrate
* usage of Eclipse technology. It is provided to you under the terms and
* conditions of the Eclipse Distribution License v1.0 which is available
* at http://www.eclipse.org/org/documents/edl-v10.php
*
* Contributors:
* IBM Corporation - initial API and implementation
*******************************************************************************/
package org.eclipse.swt.snippets;
/*
* Tree example snippet: determine which TreeItems are visible in a Tree's viewport
*
* For a list of all SWT example snippets see
* http://www.eclipse.org/swt/snippets/
*/
import org.eclipse.swt.*;
import org.eclipse.swt.widgets.*;
import org.eclipse.swt.graphics.*;
import org.eclipse.swt.layout.*;
public class Snippet358 {
public static void main(String [] args) {
Display display = new Display();
Shell shell = new Shell(display);
shell.setLayout(new GridLayout ());
final Tree tree = new Tree(shell, SWT.NONE);
tree.setLayoutData(new GridData(200, 200));
for (int i = 0; i < 9; i++) {
TreeItem item = new TreeItem(tree, SWT.NONE);
item.setText("root-level item " + i);
for (int j = 0; j < 9; j++) {
new TreeItem(item, SWT.NONE).setText("item " + i + "-" + j);
}
}
Button button = new Button(shell, SWT.PUSH);
button.setText("Print item visibilities");
button.addListener(SWT.Selection, new Listener() {
public void handleEvent(Event event) {
Rectangle treeBounds = new Rectangle(0, 0, 0, 0);
Point treeSize = tree.getSize();
treeBounds.width = treeSize.x;
treeBounds.height = treeSize.y;
TreeItem[] rootItems = tree.getItems();
for (int i = 0; i < rootItems.length; i++) {
TreeItem rootItem = rootItems[i];
System.out.println(rootItem.getText() + " is at least partially visible? " + treeBounds.intersects(rootItem.getBounds()));
TreeItem[] childItems = rootItem.getItems();
for (int j = 0; j < childItems.length; j++) {
TreeItem childItem = childItems[j];
System.out.println(childItem.getText() + " is at least partially visible? " + treeBounds.intersects(childItem.getBounds()));
}
}
}
});
shell.pack();
shell.open();
while (!shell.isDisposed()) {
if (!display.readAndDispatch()) display.sleep();
}
display.dispose ();
}
}
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