Java Tutorial/SWT/File Tree
Create a lazy file tree
<source lang="java">
/*******************************************************************************
* Copyright (c) 2000, 2004 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;
/*
* Tree example snippet: create a tree (lazy) * * For a list of all SWT example snippets see * http://www.eclipse.org/swt/snippets/ */
import java.io.File; import org.eclipse.swt.SWT; import org.eclipse.swt.graphics.Point; 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 FileTreeLazy{
public static void main (String [] args) {
final Display display = new Display ();
final Shell shell = new Shell (display);
shell.setText ("Lazy Tree");
shell.setLayout (new FillLayout ());
final Tree tree = new Tree (shell, SWT.BORDER);
File [] roots = File.listRoots ();
for (int i=0; i<roots.length; i++) {
TreeItem root = new TreeItem (tree, 0);
root.setText (roots [i].toString ());
root.setData (roots [i]);
new TreeItem (root, 0);
}
tree.addListener (SWT.Expand, new Listener () {
public void handleEvent (final Event event) {
final TreeItem root = (TreeItem) event.item;
TreeItem [] items = root.getItems ();
for (int i= 0; i<items.length; i++) {
if (items [i].getData () != null) return;
items [i].dispose ();
}
File file = (File) root.getData ();
File [] files = file.listFiles ();
if (files == null) return;
for (int i= 0; i<files.length; i++) {
TreeItem item = new TreeItem (root, 0);
item.setText (files [i].getName ());
item.setData (files [i]);
if (files [i].isDirectory()) {
new TreeItem (item, 0);
}
}
}
});
Point size = tree.ruputeSize (300, SWT.DEFAULT);
int width = Math.max (300, size.x);
int height = Math.max (300, size.y);
shell.setSize (shell.ruputeSize (width, height));
shell.open ();
while (!shell.isDisposed ()) {
if (!display.readAndDispatch ()) display.sleep ();
}
display.dispose ();
} }</source>
System File Tree
<source lang="java">
/*******************************************************************************
* Copyright (c) 2000, 2004 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 *******************************************************************************/
import java.io.File; import org.eclipse.swt.SWT; import org.eclipse.swt.awt.SWT_AWT; import org.eclipse.swt.graphics.RGB; import org.eclipse.swt.graphics.Rectangle; import org.eclipse.swt.layout.GridData; import org.eclipse.swt.layout.GridLayout; import org.eclipse.swt.widgets.ruposite; import org.eclipse.swt.widgets.Display; import org.eclipse.swt.widgets.Event; import org.eclipse.swt.widgets.Label; import org.eclipse.swt.widgets.Listener; import org.eclipse.swt.widgets.Sash; import org.eclipse.swt.widgets.Shell; import org.eclipse.swt.widgets.Tree; import org.eclipse.swt.widgets.TreeItem; public class SystemFileTree {
public static void main(String[] args) {
final Display display = new Display();
final Shell shell = new Shell(display);
RGB color = shell.getBackground().getRGB();
Label separator1 = new Label(shell, SWT.SEPARATOR | SWT.HORIZONTAL);
Label locationLb = new Label(shell, SWT.NONE);
locationLb.setText("Location:");
Composite locationComp = new Composite(shell, SWT.EMBEDDED);
Label separator2 = new Label(shell, SWT.SEPARATOR | SWT.HORIZONTAL);
final Composite comp = new Composite(shell, SWT.NONE);
final Tree fileTree = new Tree(comp, SWT.SINGLE | SWT.BORDER);
Sash sash = new Sash(comp, SWT.VERTICAL);
Composite tableComp = new Composite(comp, SWT.EMBEDDED);
Label separator3 = new Label(shell, SWT.SEPARATOR | SWT.HORIZONTAL);
Composite statusComp = new Composite(shell, SWT.EMBEDDED);
java.awt.Frame locationFrame = SWT_AWT.new_Frame(locationComp);
final java.awt.TextField locationText = new java.awt.TextField();
locationFrame.add(locationText);
java.awt.Frame statusFrame = SWT_AWT.new_Frame(statusComp);
statusFrame.setBackground(new java.awt.Color(color.red, color.green, color.blue));
final java.awt.Label statusLabel = new java.awt.Label();
statusFrame.add(statusLabel);
statusLabel.setText("Select a file");
sash.addListener(SWT.Selection, new Listener() {
public void handleEvent(Event e) {
if (e.detail == SWT.DRAG)
return;
GridData data = (GridData) fileTree.getLayoutData();
Rectangle trim = fileTree.ruputeTrim(0, 0, 0, 0);
data.widthHint = e.x - trim.width;
comp.layout();
}
});
File[] roots = File.listRoots();
for (int i = 0; i < roots.length; i++) {
File file = roots[i];
TreeItem treeItem = new TreeItem(fileTree, SWT.NONE);
treeItem.setText(file.getAbsolutePath());
treeItem.setData(file);
new TreeItem(treeItem, SWT.NONE);
}
fileTree.addListener(SWT.Expand, new Listener() {
public void handleEvent(Event e) {
TreeItem item = (TreeItem) e.item;
if (item == null)
return;
if (item.getItemCount() == 1) {
TreeItem firstItem = item.getItems()[0];
if (firstItem.getData() != null)
return;
firstItem.dispose();
} else {
return;
}
File root = (File) item.getData();
File[] files = root.listFiles();
if (files == null)
return;
for (int i = 0; i < files.length; i++) {
File file = files[i];
if (file.isDirectory()) {
TreeItem treeItem = new TreeItem(item, SWT.NONE);
treeItem.setText(file.getName());
treeItem.setData(file);
new TreeItem(treeItem, SWT.NONE);
}
}
}
});
fileTree.addListener(SWT.Selection, new Listener() {
public void handleEvent(Event e) {
TreeItem item = (TreeItem) e.item;
if (item == null)
return;
final File root = (File) item.getData();
statusLabel.setText(root.getAbsolutePath());
locationText.setText(root.getAbsolutePath());
}
});
GridLayout layout = new GridLayout(4, false);
layout.marginWidth = layout.marginHeight = 0;
layout.horizontalSpacing = layout.verticalSpacing = 1;
shell.setLayout(layout);
GridData data;
data = new GridData(GridData.FILL_HORIZONTAL);
data.horizontalSpan = 4;
separator1.setLayoutData(data);
data = new GridData();
data.horizontalSpan = 1;
data.horizontalIndent = 10;
locationLb.setLayoutData(data);
data = new GridData(GridData.FILL_HORIZONTAL);
data.horizontalSpan = 2;
data.heightHint = locationText.getPreferredSize().height;
locationComp.setLayoutData(data);
data = new GridData(GridData.FILL_HORIZONTAL);
data.horizontalSpan = 1;
data = new GridData(GridData.FILL_HORIZONTAL);
data.horizontalSpan = 4;
separator2.setLayoutData(data);
data = new GridData(GridData.FILL_BOTH);
data.horizontalSpan = 4;
comp.setLayoutData(data);
data = new GridData(GridData.FILL_HORIZONTAL);
data.horizontalSpan = 4;
separator3.setLayoutData(data);
data = new GridData(GridData.FILL_HORIZONTAL);
data.horizontalSpan = 4;
data.heightHint = statusLabel.getPreferredSize().height;
statusComp.setLayoutData(data);
layout = new GridLayout(3, false);
layout.marginWidth = layout.marginHeight = 0;
layout.horizontalSpacing = layout.verticalSpacing = 1;
comp.setLayout(layout);
data = new GridData(GridData.FILL_VERTICAL);
data.widthHint = 200;
fileTree.setLayoutData(data);
data = new GridData(GridData.FILL_VERTICAL);
sash.setLayoutData(data);
data = new GridData(GridData.FILL_BOTH);
tableComp.setLayoutData(data);
shell.open();
while (!shell.isDisposed()) {
if (!display.readAndDispatch())
display.sleep();
}
display.dispose();
}
}</source>
