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Reputation: 3269

Holding left mouse button in Minecraft Java edition on Windows

I am trying to simulate user input in Minecraft Java Edition on Windows running in background. Specifically, I want to simulate holding left mouse button.

In order to simplify it, I set rawMouseInput:false in options.txt.

For mouse input the issue is that after receiving WM_LBUTTONDOWN Minecraft behaves as if WM_LBUTTONUP immediately followed although I can see in the debugger that it is not the case. As a result actions like mining a block start but are immediately interrupted.

Now I did some investigation, and it seems that Minecraft is using LWJGL 3 Java library, which in turn uses GLFW C library to handle user input.

I cloned latest GLFW and built a simple boing example. However, I can not reproduce the same issue with that example: boing appears to correctly treat WM_LBUTTONDOWN as the beginning of the action, and does not stop the action until I send WM_LBUTTONUP.

Is there something special Minecraft does for input that causes such behavior?

How do I simulate holding left mouse button in Minecraft running in background?

Upvotes: 1

Views: 428

Answers (1)

Frisby
Frisby

Reputation: 1

It seems that you've overthought this a bit too much. Java has a built-in keyboard and mouse simulator, which, as far as I've seen, works fine.

java.awt.Robot robot = new Robot();
robot.mousePress(MouseEvent.<your_button_here>);
---<wait however long you want>---
robot.mouseRelease(MouseEvent.<your_button_here>);

Sorry if this appears off-topic, but it does avoid a whole host of problems...

Upvotes: 0

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