org.eclipse.swt.snippets.Snippet8 source code

1 #!/usr/bin/env dub
2 /+
3 dub.sdl:
4     name "snippet8"
5     dependency "dwt" path="../../../../../../" version="*"
6     libs \
7       "atk-1.0" \
8       "cairo" \
9       "dl" \
10       "fontconfig" \
11       "gdk-x11-2.0" \
12       "gdk_pixbuf-2.0" \
13       "gio-2.0" \
14       "glib-2.0" \
15       "gmodule-2.0" \
16       "gobject-2.0" \
17       "gthread-2.0" \
18       "gtk-x11-2.0" \
19       "pango-1.0" \
20       "pangocairo-1.0" \
21       "X11" \
22       "Xcomposite" \
23       "Xcursor" \
24       "Xdamage" \
25       "Xext" \
26       "Xfixes" \
27       "Xi" \
28       "Xinerama" \
29       "Xrandr" \
30       "Xrender" \
31       "Xtst" \
32       platform="linux"
33 +/
34 
35 /*******************************************************************************
36  * Copyright (c) 2000, 2016 IBM Corporation and others.
37  * All rights reserved. This program and the accompanying materials
38  * are made available under the terms of the Eclipse Public License v1.0
39  * which accompanies this distribution, and is available at
40  * http://www.eclipse.org/legal/epl-v10.html
41  *
42  * Contributors:
43  *     IBM Corporation - initial API and implementation
44  * D Port:
45  *     Jesse Phillips <Jesse.K.Phillips+D> gmail.com
46  *******************************************************************************/
47 module org.eclipse.swt.snippets.Snippet8;
48 
49 /*
50  * Tree example snippet: create a tree (lazy)
51  *
52  * For a list of all SWT example snippets see
53  * http://www.eclipse.org/swt/snippets/
54  */
55 
56 import org.eclipse.swt.SWT;
57 import org.eclipse.swt.layout.FillLayout;
58 import org.eclipse.swt.graphics.Point;
59 import org.eclipse.swt.widgets.Display;
60 import org.eclipse.swt.widgets.Event;
61 import org.eclipse.swt.widgets.Listener;
62 import org.eclipse.swt.widgets.Shell;
63 import org.eclipse.swt.widgets.Tree;
64 import org.eclipse.swt.widgets.TreeItem;
65 
66 import java.lang.all;
67 
68 import std.file;
69 import std.path;
70 
71 /* DWT Compatibility */
72 class FileSystem {
73     static string[] roots() {return [absolutePath(dirSeparator)];}
74 }
75 class FilePath {
76     string path;
77     this (string path) {this.path = path;}
78     FilePath[] toList() {
79         FilePath[] r;
80         foreach (string file; dirEntries(path, SpanMode.shallow)) {
81             r ~= new FilePath(std.path.buildPath(path, file));
82         }
83         return r;
84     }
85     bool isFolder() {return exists(path) && isDir(path);}
86     override
87     string toString() {return path;}
88 }
89 
90 void main () {
91     auto display = new Display ();
92     auto shell = new Shell (display);
93     shell.setText ("Lazy Tree");
94     shell.setLayout (new FillLayout ());
95     auto tree = new Tree (shell, SWT.BORDER);
96     auto roots = FileSystem.roots();
97     foreach (file; roots) {
98         auto root = new TreeItem (tree, 0);
99         root.setText (file);
100         root.setData (new FilePath(file));
101         new TreeItem (root, 0);
102     }
103     tree.addListener (SWT.Expand, new class Listener {
104         public void handleEvent (Event event) {
105             auto root = cast(TreeItem) event.item;
106             auto items = root.getItems ();
107             foreach(item; items) {
108                 if (item.getData () !is null) return;
109                 item.dispose ();
110             }
111             auto file = cast(FilePath) root.getData ();
112             auto files = file.toList();
113             if (files is null) return;
114             foreach (f; files) {
115                 TreeItem item = new TreeItem (root, 0);
116                 item.setText (f.toString());
117                 item.setData (f);
118                 if (f.isFolder()) {
119                     new TreeItem (item, 0);
120                 }
121             }
122         }
123     });
124     auto size = tree.computeSize (300, SWT.DEFAULT);
125     auto width = Math.max (300, size.x);
126     auto height = Math.max (300, size.y);
127     shell.setSize (shell.computeSize (width, height));
128     shell.open ();
129     while (!shell.isDisposed ()) {
130         if (!display.readAndDispatch ()) display.sleep ();
131     }
132     display.dispose ();
133 }