| /******************************************************************************* |
| * Copyright (c) 2011, 2016 IBM Corporation and others. |
| * |
| * 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.graphics.*; |
| import org.eclipse.swt.layout.*; |
| import org.eclipse.swt.widgets.*; |
| |
| public class Snippet358 { |
| |
| public static void main(String [] args) { |
| Display display = new Display(); |
| Shell shell = new Shell(display); |
| shell.setText("Snippet 358"); |
| 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, 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 (); |
| } |
| |
| } |