如何在javafx8中获取节点句柄

Question

We're building a JavaFX application in Windows.

I've tried to use JNA Native.getComponentPointer() method which works with java.awt.panel , but I can't figure out a good way to do this with a javafx.scene.layout.Pane

Does anyone know of any way to do get hWnd for a Pane ?

Answer 1

Unfortunately, I do not think that this is possible with JavaFX. The only thing that I can see that has a native peer is the Stage. You can verify this yourself by using a ui analyzer tool, such as WinSpy, or "inspect.exe" or "visualuiaverifynative.exe" from the Windows SDK.

From Mixing Heavyweight and Lightweight Components by Oracle :

There are two kinds of graphics components in the Java programming language: heavyweight and lightweight. A heavyweight component is associated with its own native screen resource (commonly known as a peer). Components from the java.awt package, such as Button and Label, are heavyweight components.

[...]

A lightweight component has no native screen resource of its own, so it is "lighter." A lightweight component relies on the screen resource from an ancestor in the containment hierarchy, possibly the underlying Frame object. Components from the javax.swing package, such as JButton and JLabel, are lightweight components.

In this case, JavaFX is just like Swing; a lightweight toolkit where the various ui components are all written in Java and do not have a native peer.

Answer 2

As far as my reading of the doc goes, there is a 1:1 relationship between an hWnd and a window object. Panes and Nodes aren't Windows , so trying to get an hwnd specific node doesn't seem to make a lot of sense.

The most you could ask for is the hwnd of the window containing the node. See:

• How can I get the window handle (hWnd) for a Stage in JavaFX? .

Applying the function from the answer to the linked question gets:

Pointer hwnd = getWindowPointer(node.getScene().getWindow());