1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
|
package com.itmill.toolkit.demo;
import java.io.File;
import com.itmill.toolkit.data.Item;
import com.itmill.toolkit.demo.util.SampleDirectory;
import com.itmill.toolkit.ui.*;
import com.itmill.toolkit.ui.Tree.ExpandEvent;
/**
* Browsable file explorer using Toolkit Tree component. Demonstrates: how to
* add items hierarchially into
* <code>com.itmill.toolkit.ui.Component.Tree</code>, how to receive
* ExpandEvent and implement
* <code>com.itmill.toolkit.ui.Tree.ExpandListener</code>.
*
* @since 4.0.0
*
*/
public class TreeFilesystem extends com.itmill.toolkit.Application implements
Tree.ExpandListener {
// Filesystem explorer panel and it's components
private Panel explorerPanel = new Panel("Filesystem explorer");
private Tree tree = new Tree();
public void init() {
Window main = new Window("Tree filesystem demo");
setMainWindow(main);
// set the application to use Corporate -theme
setTheme("corporate");
// Main window contains heading and panel
main.addComponent(new Label("<h2>Tree demo</h2>", Label.CONTENT_XHTML));
// configure file structure panel
main.addComponent(explorerPanel);
explorerPanel.addComponent(tree);
explorerPanel.setHeight(400);
// "this" handles tree's expand event
tree.addListener((Tree.ExpandListener) this);
// Get sample directory
File sampleDir = SampleDirectory.getDirectory(this);
// populate tree's root node with example directory
if (sampleDir != null)
populateNode(sampleDir.getAbsolutePath(), null);
}
/**
* Handle tree expand event, populate expanded node's childs with new files
* and directories.
*/
public void nodeExpand(ExpandEvent event) {
Item i = tree.getItem(event.getItemId());
if (!tree.hasChildren(i)) {
// populate tree's node which was expanded
populateNode(event.getItemId().toString(), event.getItemId());
}
}
/**
* Populates files to tree as items. In this example items are of String
* type that consist of file path. New items are added to tree and item's
* parent and children properties are updated.
*
* @param file
* path which contents are added to tree
* @param parent
* for added nodes, if null then new nodes are added to root node
*/
private void populateNode(String file, Object parent) {
File subdir = new File(file);
File[] files = subdir.listFiles();
for (int x = 0; x < files.length; x++) {
try {
// add new item (String) to tree
String path = files[x].getCanonicalPath().toString();
tree.addItem(path);
// set parent if this item has one
if (parent != null)
tree.setParent(path, parent);
// check if item is a directory and read access exists
if (files[x].isDirectory() && files[x].canRead())
// yes, childrens therefore exists
tree.setChildrenAllowed(path, true);
else
// no, childrens therefore do not exists
tree.setChildrenAllowed(path, false);
} catch (Exception e) {
throw new RuntimeException(e);
}
}
}
}
|
