в 17:44, 31 мая 2010

2010-05-31T17:44:26Z

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2010-05-31T15:20:15Z

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== Add checkbox mark to the tree node ==



<source lang="java">
import org.eclipse.swt.SWT;
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.Tree;
import org.eclipse.swt.widgets.TreeItem;
public class TreeNodeCheckBoxAdd {
public static void main(String[] args) {
Display display = new Display();
Shell shell = new Shell(display);
Tree tree = new Tree(shell, SWT.CHECK | SWT.BORDER | SWT.V_SCROLL | SWT.H_SCROLL);
for (int i = 0; i < 12; i++) {
TreeItem item = new TreeItem(tree, SWT.NONE);
item.setText("Item " + i);
for(int l = 0;l<12;l++){
TreeItem litem = new TreeItem(item, SWT.NONE);
litem.setText("Item " + i);
}

}
tree.setSize(100, 100);
shell.setSize(200, 200);
shell.open();
while (!shell.isDisposed()) {
if (!display.readAndDispatch())
display.sleep();
}
display.dispose();
}
}</source>



== A multiselection tree ==



<source lang="java">
import org.eclipse.swt.SWT;
import org.eclipse.swt.layout.GridLayout;
import org.eclipse.swt.widgets.Display;
import org.eclipse.swt.widgets.Shell;
import org.eclipse.swt.widgets.Tree;
import org.eclipse.swt.widgets.TreeItem;
/**
* Displays a single-selection tree, a multiselection tree, and a checkbox tree
*/
public class TreeMultiSelection {

public static void main(String[] args) {
Display display = new Display();
Shell shell = new Shell(display);
shell.setText("TreeExample");
Tree tree = new Tree(shell, SWT.MULTI | SWT.BORDER);
// Turn off drawing to avoid flicker
tree.setRedraw(false);
for (int i = 0; i < 5; i++) {
TreeItem item = new TreeItem(tree, SWT.NONE);
item.setText("Root Item " + i);
for (int j = 0; j < 3; j++) {
TreeItem child = new TreeItem(item, SWT.NONE);
child.setText("Child Item " + i + " - " + j);
for (int k = 0; k < 3; k++) {
TreeItem grandChild = new TreeItem(child, SWT.NONE);
grandChild.setText("Grandchild Item " + i + " - " + j + " - " + k);
}
}
}
tree.setRedraw(true);

tree.setBounds(10,10,400,400);
shell.open();
while (!shell.isDisposed()) {
if (!display.readAndDispatch()) {
display.sleep();
}
}
display.dispose();
}
}</source>



== A single-selection tree ==



<source lang="java">
import org.eclipse.swt.SWT;
import org.eclipse.swt.layout.GridLayout;
import org.eclipse.swt.widgets.Display;
import org.eclipse.swt.widgets.Shell;
import org.eclipse.swt.widgets.Tree;
import org.eclipse.swt.widgets.TreeItem;
public class TreeSingleSelection {
public static void main(String[] args) {
Display display = new Display();
Shell shell = new Shell(display);
shell.setText("TreeExample");
Tree tree = new Tree(shell, SWT.SINGLE | SWT.BORDER);
// Turn off drawing to avoid flicker
tree.setRedraw(false);
for (int i = 0; i < 5; i++) {
TreeItem item = new TreeItem(tree, SWT.NONE);
item.setText("Root Item " + i);
for (int j = 0; j < 3; j++) {
TreeItem child = new TreeItem(item, SWT.NONE);
child.setText("Child Item " + i + " - " + j);
for (int k = 0; k < 3; k++) {
TreeItem grandChild = new TreeItem(child, SWT.NONE);
grandChild.setText("Grandchild Item " + i + " - " + j + " - " + k);
}
}
}
tree.setRedraw(true);

tree.setBounds(10,10,400,400);
shell.open();
while (!shell.isDisposed()) {
if (!display.readAndDispatch()) {
display.sleep();
}
}
display.dispose();
}
}</source>



== Create a Tree ==



<source lang="java">
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.Tree;
import org.eclipse.swt.widgets.TreeItem;
public class TreeCreate {
public static void main(String[] args) {
Display display = new Display();
Shell shell = new Shell(display);
shell.setLayout(new FillLayout());
final Tree tree = new Tree(shell, SWT.BORDER);
for (int i = 0; i < 4; i++) {
TreeItem iItem = new TreeItem(tree, 0);
iItem.setText("TreeItem (0) -" + i);
for (int j = 0; j < 4; j++) {
TreeItem jItem = new TreeItem(iItem, 0);
jItem.setText("TreeItem (1) -" + j);
for (int k = 0; k < 4; k++) {
TreeItem kItem = new TreeItem(jItem, 0);
kItem.setText("TreeItem (2) -" + k);
for (int l = 0; l < 4; l++) {
TreeItem lItem = new TreeItem(kItem, 0);
lItem.setText("TreeItem (3) -" + l);
for (int m = 0; m < 4; m++) {
TreeItem mItem = new TreeItem(lItem, 0);
mItem.setText("TreeItem (3) -" + l);
}

}
}
}
}
shell.setSize(200, 200);
shell.open();
while (!shell.isDisposed()) {
if (!display.readAndDispatch())
display.sleep();
}
display.dispose();
}
}</source>



== Create Three Level Tree ==



<source lang="java">
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.Tree;
import org.eclipse.swt.widgets.TreeItem;
public class TreeThreeLevel {
public static void main(String[] args) {
final Display display = new Display();
final Shell shell = new Shell(display);
shell.setLayout(new FillLayout());

final Tree tree = new Tree(shell, SWT.BORDER);
for (int i = 0; i < 3; i++) {
TreeItem item = new TreeItem(tree, SWT.NONE);
item.setText("item " + i);
for (int j = 0; j < 3; j++) {
TreeItem subItem = new TreeItem(item, SWT.NONE);
subItem.setText("item " + i + " " + j);
for (int k = 0; k < 3; k++) {
TreeItem subsubItem = new TreeItem(subItem, SWT.NONE);
subsubItem.setText("item " + i + " " + j + " " + k);
}
}
}
shell.setSize(400, 400);
shell.open();
while (!shell.isDisposed()) {
if (!display.readAndDispatch())
display.sleep();
}
display.dispose();
}
}</source>



== Insert TreeItem to Tree ==



<source lang="java">
import org.eclipse.swt.SWT;
import org.eclipse.swt.widgets.Display;
import org.eclipse.swt.widgets.Shell;
import org.eclipse.swt.widgets.Tree;
import org.eclipse.swt.widgets.TreeItem;
public class TreeItemInsert {
public static void main(String[] args) {
Display display = new Display();
Shell shell = new Shell(display);
Tree tree = new Tree(shell, SWT.BORDER | SWT.MULTI);
tree.setSize(200, 200);
for (int i = 0; i < 5; i++) {
TreeItem item = new TreeItem(tree, SWT.NONE);
item.setText("Item " + i);
}

TreeItem item = new TreeItem(tree, SWT.NONE, 1);
item.setText("*** New Item ***");

shell.pack();
shell.open();
while (!shell.isDisposed()) {
if (!display.readAndDispatch())
display.sleep();
}
display.dispose();
}
}</source>



== Populate tree lazily ==



<source lang="java">
/*******************************************************************************
* 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 Tree example snippet: populate tree lazily
*
* For a list of all SWT example snippets see
* http://www.eclipse.org/swt/snippets/
*
* @since 3.2
*/
import org.eclipse.swt.SWT;
import org.eclipse.swt.layout.FillLayout;
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.Tree;
import org.eclipse.swt.widgets.TreeItem;
public class TreePopulateLazy {
public static void main(String[] args) {
Display display = new Display();
final Shell shell = new Shell(display);
shell.setLayout(new FillLayout());
final Tree tree = new Tree(shell, SWT.VIRTUAL | SWT.BORDER);
tree.addListener(SWT.SetData, new Listener() {
public void handleEvent(Event event) {
TreeItem item = (TreeItem) event.item;
TreeItem parentItem = item.getParentItem();
String text = null;
if (parentItem == null) {
text = "node " + tree.indexOf(item);
} else {
text = parentItem.getText() + " - " + parentItem.indexOf(item);
}
item.setText(text);
item.setItemCount(10);
}
});
tree.setItemCount(20);
shell.setSize(400, 300);
shell.open();
while (!shell.isDisposed()) {
if (!display.readAndDispatch())
display.sleep();
}
display.dispose();
}
}</source>



== Trees ==

SWT uses two classes, Tree and TreeItem, to implement tree controls.
Creating Trees



<source lang="java">
public Tree(Composite parent, int style)</source>



Trees can allow either a single selection or multiple selections.
Tree Styles
StyleDescriptionSWT.SINGLEAllows only one item in the tree to be selected at a time. This is the default.SWT.MULTIAllows multiple items in the tree to be selected at the same time.SWT.CHECKDisplays a checkbox to the left of each of the root items in the tree.

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в 17:44, 31 мая 2010

Admin: 1 версия