JavaFX8：Treeview，鼠标点击图标或文本

Question

我可以从TreeViewItem获取不同的鼠标单击事件，具体取决于用户点击图标或文本标签吗？该图标不是树的折叠图像。

Answer 1

根据Disable TreeItem's default expand/collapse on double click JavaFX 2.2，我更改了TreeMouseEventDispatcher的构造函数：

class TreeMouseEventDispatcher implements EventDispatcher {
    private final EventDispatcher originalDispatcher;
    private final TreeCell<?> cell;

    public TreeMouseEventDispatcher(EventDispatcher originalDispatcher, TreeCell<?> cell) {
      this.originalDispatcher = originalDispatcher;
      this.cell = cell;
    }

    private boolean isMouseEventOnGraphic(Node icon, Point2D coord) {
        if (icon == null) {
           return false;
        }
        return icon.localToScene(icon.getBoundsInLocal()).contains(coord);
    }

    @Override
    public Event dispatchEvent(Event event, EventDispatchChain tail) {
        if (event instanceof MouseEvent) {
           MouseEvent mouseEvent = (MouseEvent) event;
           if (mouseEvent.getButton() == MouseButton.PRIMARY
               && mouseEvent.getClickCount() >= 2) {

             if (!mouseEvent.isConsumed()) {
                if (isMouseEventOnGraphic(cell.getGraphic(), new Point2D(mouseEvent.getSceneX(), mouseEvent.getSceneY()))) {
                   // action for double click on graphic
                } else {
                   // action for double click on all other elements of
                   // the TreeCell (like text, text gap, disclosure node)
                }
             }
             event.consume();
           }
        }
        return originalDispatcher.dispatchEvent(event, tail);
    }
}

然后将此TreeMouseEventDispatcher用于TreeCell：

treeView.setCellFactory(new Callback<TreeView<T>, TreeCell<T>>() {
  @Override
  public TreeCell<T> call(TreeView<T> param) {
    return new TreeCell<T>() {
      @Override
      protected void updateItem(T item, boolean empty) {
        if (item != null && !empty) {
          EventDispatcher originalDispatcher = getEventDispatcher();
          setEventDispatcher(new TreeMouseEventDispatcher(originalDispatcher, this));
        }
      }
    };
  }
}