File Tree View with Image

Having had the message on my blog about JavaFX TreeViewSample(FYR. 2013-03-23 - tomoTakaの日記), I was so happy. So I wanted to add ImageView on this application.
It is easy thanks to JavaFX ImageView control.

• Figure1

You can see the Images on each Tree Cell.

• code1(PathTreeCell.java)

This code shows you how to set ImageView to TreeCell by using setGraphic method.

    @Override
    protected void updateItem(PathItem item, boolean empty) {
        super.updateItem(item, empty);
        if (empty) {
            setText(null);
            setGraphic(null);
        } else {
            final String itemString = getString();
            if (isEditing()) {
                if (textField != null) {
                    textField.setText(itemString);
                }
                setText(null);
                setGraphic(textField);
            } else {
                setText(itemString);
                if (isImage(itemString)) { // <-- see code2
                    setGraphic(getImage(itemString)); // <-- *** add ImageView here(see code3)
                } else {
                    setGraphic(null);
                }
                if (!getTreeItem().isLeaf()) {
                    setContextMenu(dirMenu);
                } else {
                    setContextMenu(fileMenu);
                }
            }
        }
    }

• code 2

I found the blog about how to check if the file is image or not.(http://qiita.com/pcpDev/items/a4963bb2a7c3e5073cdb).
This helps me a lot, but it does not work for tiff file...

...
    private static List<String> imageList;
    static {
        imageList = Arrays.asList("BMP", "DIB", "RLE", "JPG", "JPEG" , "JPE", "JFIF"
        , "GIF", "EMF", "WMF", "TIF", "TIFF", "PNG", "ICO");
    }
...
    private boolean isImage(String itemPath) {
        String parentPath = getItem().getPath().getParent().toAbsolutePath().toString();
        try {
            URL url = new URL("file:" + parentPath + "/" + itemPath);
            String formatName = "";
            try (ImageInputStream iis = ImageIO.createImageInputStream(url.openStream())) {
                Iterator<ImageReader> readers = ImageIO.getImageReaders(iis);
                if (readers.hasNext()) { // <-- this does not work for tiff file???
                    ImageReader reader = readers.next();
                    formatName = reader.getFormatName();
                }
            }
            if (imageList.contains(formatName.toUpperCase())) {
                return true;
            }
        } catch (Exception e) {
            return false;
        }
        return false;
    }

• code 3

ImageView has very useful method like setFitWidth to resize your image.

    private Node getImage(String itemPath) {
        String parentPath = getItem().getPath().getParent().toAbsolutePath().toString();
        Image image = new Image("file:" + parentPath + "/" + itemPath);
        ImageView imageView = new ImageView();
        imageView.setImage(image);
        imageView.setFitWidth(10); // <-- set size of image
        imageView.setPreserveRatio(true);
        return imageView;
    }

The whole code is here(tomoTaka01/FileTreeViewSample: JavaFX File ... - GitHub)

PS; When I put this blog,Mr.@skrb who is Java champion in Japan had suggested to use javafx.scene.image.Image instead of ImageIO. Then I amended the code about how to check if TreeCell is image or not. I feel so happy since I received message from such a nice person!

• amended code1

...
                setText(itemString);
                final Node image = getImage(itemString);
                if (image != null) {  // <-- not use isImage method(code2)
                    setGraphic(image); // <-- *** add image
                } else {
                    setGraphic(null);
                }
...

• amended code3

    private Node getImage(String itemPath) {
        String parentPath = getItem().getPath().getParent().toAbsolutePath().toString();
        Image image = new Image("file:" + parentPath + "/" + itemPath);
        if (image.isError()) {
            return null; // <-- if not image
        }
        ImageView imageView = new ImageView();
        imageView.setImage(image);
        imageView.setFitWidth(10); // <-- set size of image
        imageView.setPreserveRatio(true);
        return imageView;
    }

I tried to resolve about Tiff file, but it is very difficult for me so far. I will find the way how to deal Tiff file in Java...
Anyway coding something in Java is so fun. ;-)