org.eclipse.swt.snippets.Snippet8 source code

1 #!/usr/bin/env dub
2 /+
3 dub.sdl:
4     name "snippet8"
5     dependency "dwt" path="../../../../../../"
6     libs \
7       "atk-1.0" \
8       "cairo" \
9       "dl" \
10       "fontconfig" \
11       "gdk-x11-2.0" \
12       "gdk_pixbuf-2.0" \
13       "glib-2.0" \
14       "gmodule-2.0" \
15       "gnomeui-2" \
16       "gnomevfs-2" \
17       "gobject-2.0" \
18       "gthread-2.0" \
19       "gtk-x11-2.0" \
20       "pango-1.0" \
21       "pangocairo-1.0" \
22       "X11" \
23       "Xcomposite" \
24       "Xcursor" \
25       "Xdamage" \
26       "Xext" \
27       "Xfixes" \
28       "Xi" \
29       "Xinerama" \
30       "Xrandr" \
31       "Xrender" \
32       "Xtst" \
33       platform="linux"
34 +/
35 
36 /*******************************************************************************
37  * Copyright (c) 2000, 2004 IBM Corporation and others.
38  * All rights reserved. This program and the accompanying materials
39  * are made available under the terms of the Eclipse Public License v1.0
40  * which accompanies this distribution, and is available at
41  * http://www.eclipse.org/legal/epl-v10.html
42  *
43  * Contributors:
44  *     IBM Corporation - initial API and implementation
45  * D Port:
46  *     Jesse Phillips <Jesse.K.Phillips+D> gmail.com
47  *******************************************************************************/
48 module org.eclipse.swt.snippets.Snippet8;
49 
50 /*
51  * Tree example snippet: create a tree (lazy)
52  *
53  * For a list of all SWT example snippets see
54  * http://www.eclipse.org/swt/snippets/
55  */
56 
57 import org.eclipse.swt.SWT;
58 import org.eclipse.swt.layout.FillLayout;
59 import org.eclipse.swt.graphics.Point;
60 import org.eclipse.swt.widgets.Display;
61 import org.eclipse.swt.widgets.Event;
62 import org.eclipse.swt.widgets.Listener;
63 import org.eclipse.swt.widgets.Shell;
64 import org.eclipse.swt.widgets.Tree;
65 import org.eclipse.swt.widgets.TreeItem;
66 
67 import java.lang.all;
68 version(Tango){
69     import tango.io.FilePath;
70     import tango.io.FileSystem;
71 } else { // Phobos
72     import std.file;
73     import std.path;
74     class FileSystem {
75         static string[] roots() {return [absolutePath(dirSeparator)];}
76     }
77     class FilePath {
78         string path;
79         this (string path) {this.path = path;}
80         FilePath[] toList() {
81             FilePath[] r;
82             foreach (string file; dirEntries(path, SpanMode.shallow)) {
83                 r ~= new FilePath(std.path.buildPath(path, file));
84             }
85             return r;
86         }
87         bool isFolder() {return exists(path) && isDir(path);}
88         override
89         string toString() {return path;}
90     }
91 }
92 
93 void main () {
94     auto display = new Display ();
95     auto shell = new Shell (display);
96     shell.setText ("Lazy Tree");
97     shell.setLayout (new FillLayout ());
98     auto tree = new Tree (shell, SWT.BORDER);
99     auto roots = FileSystem.roots();
100     foreach (file; roots) {
101         auto root = new TreeItem (tree, 0);
102         root.setText (file);
103         root.setData (new FilePath(file));
104         new TreeItem (root, 0);
105     }
106     tree.addListener (SWT.Expand, new class Listener {
107         public void handleEvent (Event event) {
108             auto root = cast(TreeItem) event.item;
109             auto items = root.getItems ();
110             foreach(item; items) {
111                 if (item.getData () !is null) return;
112                 item.dispose ();
113             }
114             auto file = cast(FilePath) root.getData ();
115             auto files = file.toList();
116             if (files is null) return;
117             foreach (f; files) {
118                 TreeItem item = new TreeItem (root, 0);
119                 item.setText (f.toString());
120                 item.setData (f);
121                 if (f.isFolder()) {
122                     new TreeItem (item, 0);
123                 }
124             }
125         }
126     });
127     auto size = tree.computeSize (300, SWT.DEFAULT);
128     auto width = Math.max (300, size.x);
129     auto height = Math.max (300, size.y);
130     shell.setSize (shell.computeSize (width, height));
131     shell.open ();
132     while (!shell.isDisposed ()) {
133         if (!display.readAndDispatch ()) display.sleep ();
134     }
135     display.dispose ();
136 }