Widget Gallery

  void Tree() {
    WContainerWidget container = new WContainerWidget();
    WTree tree = new WTree();
    container.addWidget(tree);
    tree.setSelectionMode(SelectionMode.Extended);
    WIconPair folderIcon =
        new WIconPair("icons/yellow-folder-closed.png", "icons/yellow-folder-open.png", false);
    WTreeNode node = new WTreeNode("Furniture", folderIcon);
    final WTreeNode furnitureNode = node;
    tree.setTreeRoot(node);
    tree.getTreeRoot().getLabel().setTextFormat(TextFormat.Plain);
    tree.getTreeRoot().setLoadPolicy(ContentLoading.NextLevel);
    tree.getTreeRoot().addChildNode(new WTreeNode("Table"));
    tree.getTreeRoot().addChildNode(new WTreeNode("Cupboard"));
    WTreeNode subtree = new WTreeNode("Chair");
    WTreeNode subtree_ = tree.getTreeRoot().addChildNode(subtree);
    tree.getTreeRoot().addChildNode(new WTreeNode("Coach"));
    tree.getTreeRoot().expand();
    subtree_.addChildNode(new WTreeNode("Doc"));
    subtree_.addChildNode(new WTreeNode("Grumpy"));
    subtree_.addChildNode(new WTreeNode("Happy"));
    subtree_.addChildNode(new WTreeNode("Sneezy"));
    subtree_.addChildNode(new WTreeNode("Dopey"));
    subtree_.addChildNode(new WTreeNode("Bashful"));
    subtree_.addChildNode(new WTreeNode("Sleepy"));
    WPushButton imageButton = new WPushButton("Use Image Icons");
    container.addWidget(imageButton);
    imageButton
        .clicked()
        .addListener(
            this,
            () -> {
              WIconPair icon =
                  new WIconPair(
                      "icons/yellow-folder-closed.png", "icons/yellow-folder-open.png", false);
              furnitureNode.setLabelIcon(icon);
            });
    WPushButton FAButton = new WPushButton("Use Font-Awesome Icons");
    container.addWidget(FAButton);
    FAButton.clicked()
        .addListener(
            this,
            () -> {
              WIconPair icon = new WIconPair("folder", "folder-open", false);
              icon.setIconsType(WIconPair.IconType.IconName);
              furnitureNode.setLabelIcon(icon);
            });
  }