On 1.15.2, trying to simulate mouse clicks for a mod for a custom hardware input device.

 

Mouse pointer movement works fine, using 

GLFW.glfwSetCursorPos()

However, none of extensive attempts to simulate a mouse click has worked so far. One way is to use java.awt.Robot, but the mod sees itself in a headless environment, where Robot cannot function. (it appears others have successfully used this, but perhaps on old mc versions? is 1.15.2 fundamentally different in this respect?). Other attempts include:

MinecraftForge.EVENT_BUS.post(new GuiScreenEvent.MouseClickedEvent.Pre(screen, x, y, GLFW.GLFW_MOUSE_BUTTON_1));

Because these mouse clicks are for GUIs, not the main game (click events in the game itself can be simulated by activating a keybinding).

 

Many many hours lost through this so far, any ideas greatly appreciated. Am new to Minecraft modding, although very familiar with java.

Was a noob mistake. The coordinates used by GLFW for cursor positioning are display pixels, whereas mc renders to a multiple. What worked was:

double s = mc.getMainWindow().getGuiScaleFactor();
mc.currentScreen.mouseClicked(x/s, y/s, 0); // 0 is code for left button
MinecraftForge.EVENT_BUS.post(new GuiScreenEvent.MouseClickedEvent.Pre(mc.currentScreen, x/s, y/s, 0)); // share event with any mouse handlers (optional)

Hope this helps anyone doing something similar

I am trying to do a similar thing on 1.16.2 but the 

mc.currentScreen.mouseClicked()

method doesn't seem to exist anymore.

 

Do you have any idea of what this was replaced with or an alternate solution?