nashorn/samples/filebrowser.js
author lana
Thu, 29 Jan 2015 15:36:59 -0800
changeset 28654 6a22230c068f
parent 26067 b32ccc3a76c9
permissions -rw-r--r--
Merge
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#// Usage: jjs -fx filebrowser.js -- <start_dir>
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/*
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 * Copyright (c) 2014, Oracle and/or its affiliates. All rights reserved.
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 *
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 * Redistribution and use in source and binary forms, with or without
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 * modification, are permitted provided that the following conditions
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 * are met:
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 *
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 *   - Redistributions of source code must retain the above copyright
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 *     notice, this list of conditions and the following disclaimer.
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 *
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 *   - Redistributions in binary form must reproduce the above copyright
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 *     notice, this list of conditions and the following disclaimer in the
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 *     documentation and/or other materials provided with the distribution.
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 *
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 *   - Neither the name of Oracle nor the names of its
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 *     contributors may be used to endorse or promote products derived
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 *     from this software without specific prior written permission.
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 *
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 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
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 * IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
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 * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE COPYRIGHT OWNER OR
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 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
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 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
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 * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
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 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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 */
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// Uses -fx and javafx TreeView to visualize directories
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if (!$OPTIONS._fx) {
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    print("Usage: jjs -fx filebrowser.js -- <start_dir>");
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    exit(1);
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}
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// Java classes used
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var File = Java.type("java.io.File");
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var Files = Java.type("java.nio.file.Files");
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// check directory argument, if passed
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var dir = arguments.length > 0? new File(arguments[0]) : new File(".");
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if (! dir.isDirectory()) {
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    print(dir + " is not a directory!");
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    exit(2);
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}
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// JavaFX classes used
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var FXCollections = Java.type("javafx.collections.FXCollections");
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var Scene     = Java.type("javafx.scene.Scene");
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var TreeItem  = Java.type("javafx.scene.control.TreeItem");
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var TreeView  = Java.type("javafx.scene.control.TreeView");
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// create a subclass of JavaFX TreeItem class
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var LazyTreeItem = Java.extend(TreeItem);
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// lazily filling children of a directory LazyTreeItem
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function buildChildren(dir) {
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    var children = FXCollections.observableArrayList();
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    var stream = Files.list(dir.toPath());
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    stream.forEach(function(path) {
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        var file = path.toFile();
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        var item = file.isDirectory()?
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            makeLazyTreeItem(file) : new TreeItem(file.name);
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        children.add(item);
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    });
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    stream.close();
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    return children;
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}
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// create an instance LazyTreeItem with override methods
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function makeLazyTreeItem(dir) {
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    var item = new LazyTreeItem(dir.name) {
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        expanded: false,
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        isLeaf: function() false,
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        getChildren: function() {
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            if (! this.expanded) {
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                // call super class (TreeItem) method
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                Java.super(item).getChildren().setAll(buildChildren(dir));
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                this.expanded = true;
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            }
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            // call super class (TreeItem) method
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            return Java.super(item).getChildren();
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        }
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    }
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    return item;
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}
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// JavaFX start method
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function start(stage) {
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    stage.title = dir.absolutePath;
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    var rootItem = makeLazyTreeItem(dir);
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    rootItem.expanded = true;
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    var tree = new TreeView(rootItem);
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    stage.scene = new Scene(tree, 300, 450);
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    stage.show();
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}