How to capture window resize event?

General Discussion
1

I want users to be able to resize the game window. But when they do, I need to capture that event to re-init some stuff. Is there a way to respond to resizeing the window?

And is there something similar to respond to minimizing and maximizing it?

2

LWJGL3:

First, get the Window handle from Application context:

final long windowHandle = ((LwjglDisplay)app.getContext()).getWindowHandle();

There is a method to register a “Window refresh callback”. It is called, when the window resize, but I don’t know, if this is the only case where it is called:

GLFW.glfwSetWindowRefreshCallback(windowHandle, new GLFWWindowRefreshCallbackI() {
	@Override
	public void invoke(final long arg0) {
		System.err.println("Refreshed!");
	}
});

Maybe compare the old vs. new size first:

final int widthTargetArray = new int[1];
...height
GLFW.glfwGetWindowSize(windowHandle, widthTargetArray, heightTargetArray);

Edit: There is also a glfwSetWindowSizeCallback/GLFWWindowSizeCallback, which is for sure the better way. ^^"

1 Like
3

Or better yet, be agnostic about the underlying rendering system and just hook up to jmonkeyengine/jme3-core/src/main/java/com/jme3/system/SystemListener.java at master · jMonkeyEngine/jmonkeyengine · GitHub

3 Likes
4

Nice!

Any examples how to use this? Should I just implement it with the SimpleApplication offspring?

5

Yeah, looks like SimpleApplication implements this. So that would be one place you can hook your stuff to.

1 Like
6

If you have already said this I was too lazy to read above comments. This is how I do it.
The LegacyApplication already implemented this so you can just override this method on the SimpleApplication. When resizing it will be fired.

    @Override
    public void reshape(int w, int h) {
        System.out.println("Application requesting to reshape: " + w + ", " + h);

        //This can only be called when the application has finished loaded all the screens etc.

        super.reshape(w, h);
    }