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Clip hardware cursor on Windows using libGDX with LWJGL3 backend, otherwise catch cursor with a standard API
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import com.badlogic.gdx.ApplicationAdapter; | |
import com.badlogic.gdx.ApplicationListener; | |
import com.badlogic.gdx.Gdx; | |
import com.badlogic.gdx.backends.lwjgl3.Lwjgl3Application; | |
import com.badlogic.gdx.backends.lwjgl3.Lwjgl3Window; | |
import com.badlogic.gdx.utils.Array; | |
import com.sun.jna.Native; | |
import com.sun.jna.Pointer; | |
import com.sun.jna.platform.win32.User32; | |
import com.sun.jna.platform.win32.WinDef.HWND; | |
import com.sun.jna.platform.win32.WinDef.POINT; | |
import com.sun.jna.platform.win32.WinDef.RECT; | |
import org.lwjgl.LWJGLUtil; | |
import org.lwjgl.glfw.GLFWNativeWin32; | |
import org.panda_lang.utilities.commons.function.Lazy; | |
import java.lang.reflect.Field; | |
// LWJGL3 (glfw based) implementation of cursor clipping for hardware cursor on Windows | |
// LWJGL2 version: https://gist.github.com/dzikoysk/0b77744386a659bb7ead629f53830bfd | |
// Dependencies: JNA + JNA Platform | |
public final class Lwjgl3CatchCursorAdapter { | |
public interface GLFWUser32 extends User32 { | |
BOOL ClientToScreen(HWND hWnd, POINT lpPoint); | |
BOOL ClipCursor(RECT rect); | |
} | |
// Lazy class is just a Supplier with cache support | |
private static final Lazy<GLFWUser32> INSTANCE = new Lazy<>(() -> Native.loadLibrary("user32", GLFWUser32.class)); | |
@SuppressWarnings("unchecked") | |
private static final Lazy<Long> HWND = new Lazy<>(() -> { | |
try { | |
Lwjgl3Application application = (Lwjgl3Application) Gdx.app; | |
Field windowsField = application.getClass().getDeclaredField("windows"); | |
windowsField.setAccessible(true); | |
Array<Lwjgl3Window> windows = (Array<Lwjgl3Window>) windowsField.get(application); | |
Lwjgl3Window window = windows.first(); | |
return GLFWNativeWin32.glfwGetWin32Window(window.getWindowHandle()); | |
} catch (Exception exception) { | |
throw new RuntimeException(exception); | |
} | |
}); | |
/** | |
* Clip cursor manually on Windows | |
*/ | |
public static void setupCursorClipping() { | |
HWND hWnd = new HWND(new Pointer(HWND.get())); | |
RECT rect = new RECT(); | |
INSTANCE.get().GetClientRect(hWnd, rect); | |
POINT.ByReference leftPointReference = new POINT.ByReference(rect.left, rect.top); | |
INSTANCE.get().ClientToScreen(hWnd, leftPointReference); | |
rect.left = leftPointReference.x; | |
rect.top = leftPointReference.y; | |
POINT.ByReference rightPointReference = new POINT.ByReference(rect.right, rect.bottom); | |
INSTANCE.get().ClientToScreen(hWnd, rightPointReference); | |
rect.right = rightPointReference.x; | |
rect.bottom = rightPointReference.y; | |
INSTANCE.get().ClipCursor(rect); | |
} | |
/** | |
* Catch cursor with hardware support on Windows. | |
* The method returns {@link com.badlogic.gdx.ApplicationListener} which should call: | |
* - create() | |
* - resume() | |
* - dispose() | |
*/ | |
public static ApplicationListener createCatchCursorAdapter() { | |
if (LWJGLUtil.getPlatform() != LWJGLUtil.PLATFORM_WINDOWS) { | |
return new ApplicationAdapter() { | |
@Override | |
public void create() { | |
Gdx.input.setCursorCatched(true); | |
} | |
@Override | |
public void dispose() { | |
Gdx.input.setCursorCatched(false); | |
} | |
}; | |
} | |
// Related to enhanced cursor renderer implementation on Windows | |
// Details: https://stackoverflow.com/a/16181555/3426515 | |
// Using: https://docs.microsoft.com/en-us/windows/win32/api/winuser/nf-winuser-clipcursor | |
return new ApplicationAdapter() { | |
@Override | |
public void create() { | |
setupCursorClipping(); | |
} | |
@Override | |
public void resume() { | |
setupCursorClipping(); | |
} | |
@Override | |
public void dispose() { | |
Gdx.input.setCursorCatched(false); | |
} | |
}; | |
} | |
} |
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