Copied cocoa ime blocker

Author: kappa-maintainer

build.gradle

@@ -485,9 +485,6 @@ project(':cleanroom') {
         installer "io.netty:netty-codec-dns:$props.netty_version"
         installer "io.netty:netty-resolver-dns:$props.netty_version"
 
-        // installer 'io.netty:netty-all:4.1.93.Final'
-
-        // TODO: Unpin in 1.18.1 or when Mojang bumps the Log4J version
         installer 'org.apache.logging.log4j:log4j-api:2.24.1'
         installer 'org.apache.logging.log4j:log4j-core:2.24.1'
         installer 'org.apache.logging.log4j:log4j-slf4j2-impl:2.24.1'
@@ -504,6 +501,8 @@ project(':cleanroom') {
         installer 'jakarta.activation:jakarta.activation-api:2.1.3'
         installer 'org.glassfish.corba:glassfish-corba-omgapi:4.2.5'
         installer 'org.openjdk.nashorn:nashorn-core:15.4'
+        installer 'ca.weblite:java-objc-bridge:1.2'
+
 
         // Mixin
         installer 'com.cleanroommc:sponge-mixin:0.20.7+mixin.0.8.7'

src/main/java/com/cleanroommc/client/IMEHandler.java

@@ -1,5 +1,6 @@
 package com.cleanroommc.client;
 
+import com.cleanroommc.client.ime.CocoaIMEHandler;
 import com.cleanroommc.client.ime.WindowsIMEHandler;
 import net.minecraftforge.fml.common.FMLLog;
 import org.lwjgl.glfw.GLFW;
@@ -11,7 +12,8 @@ public class IMEHandler {
     static {
         switch (GLFW.glfwGetPlatform()) {
             case GLFW.GLFW_PLATFORM_WIN32 -> instance = new WindowsIMEHandler();
-            default -> FMLLog.log.warn("Unsupported platform: " + GLFW.glfwGetPlatform());
+            case GLFW.GLFW_PLATFORM_COCOA -> instance = new CocoaIMEHandler();
+            default -> FMLLog.log.warn("Unsupported platform: {}", GLFW.glfwGetPlatform());
         }
     }
     public static void setIME(boolean active) {

src/main/java/com/cleanroommc/client/ime/CocoaIMEHandler.java

@@ -1,13 +1,72 @@
 package com.cleanroommc.client.ime;
 
+import ca.weblite.objc.Runtime;
+import ca.weblite.objc.RuntimeUtils;
+import com.sun.jna.Callback;
+import com.sun.jna.Library;
+import com.sun.jna.Native;
 import com.sun.jna.Pointer;
 
 import java.util.function.Consumer;
 
+/**
+ * Copied from <a href="https://github.com/reserveword/IMBlocker/pull/38">IMBlocker</a>
+ */
 public class CocoaIMEHandler implements Consumer<Boolean> {
+    private static boolean active = false;
+    static private final Pointer viewClass = Runtime.INSTANCE.objc_getClass("GLFWContentView");
+    static private Pointer view = null;
+    static private final InterpretKeyEventsCallback Imp;
+    static private final InterpretKeyEventsCallback NewImp;
 
+
+    static {
+        // see https://github.com/glfw/glfw/blob/b4c3ef9d0fdf46845f3e81e5d989dab06e71e6c1/src/cocoa_window.m#L571
+        // Replacing the method dynamically to determine whether to send text based on state
+        // see reference for objc_runtime's dynamic manipulation at https://developer.apple.com/documentation/objectivec/objective-c_runtime
+        var selector = RuntimeUtils.sel("interpretKeyEvents:");
+        var method = Runtime.INSTANCE.class_getInstanceMethod(viewClass, selector);
+        Imp = ObjC.INSTANCE.method_getImplementation(method);
+        NewImp = (self, sel, eventArray) -> {
+            if (view == null) view = self;
+            if (!active) {
+                var textInputContext = RuntimeUtils.cls("NSTextInputContext");
+                var current = RuntimeUtils.msgPointer(textInputContext, "currentInputContext");
+                RuntimeUtils.msg(current, "discardMarkedText");
+                return;
+            }
+            Imp.invoke(self, sel, eventArray);
+        };
+        ObjC.INSTANCE.class_replaceMethod(viewClass, selector, NewImp, "v@:@");
+    }
+    /**
+     * The underlying native type is IMP, which should be a function pointer to the implementation of interpretKeyEvents:
+     * @see <a href="https://developer.apple.com/documentation/objectivec/objective-c_runtime/imp">Documentation for IMP</a>
+     * @see <a href="https://developer.apple.com/documentation/appkit/nsresponder/1531599-interpretkeyevents?language=objc">Documentation for interpretKeyEvents:</a>
+     */
+    private interface InterpretKeyEventsCallback extends Callback {
+        /**
+         * @param self       "this" pointer for NSObject
+         * @param selector   selector for interpretKeyEvents:
+         * @param eventArray an array of NSEvent objects
+         */
+        void invoke(Pointer self, Pointer selector, Pointer eventArray);
+    }
+
+    /**
+     * @see <a href="https://developer.apple.com/documentation/objectivec/objective-c_runtime">Apple Developer Documentation for objc_runtime:</a>
+     */
+    private interface ObjC extends Library {
+        ObjC INSTANCE = Native.load("objc.A", ObjC.class);
+
+        void class_replaceMethod(Pointer cls, Pointer selector, InterpretKeyEventsCallback imp, String types);
+
+        InterpretKeyEventsCallback method_getImplementation(Pointer selector);
+    }
     @Override
     public void accept(Boolean aBoolean) {
-
+        if (active != aBoolean) {
+            active = aBoolean;
+        }
     }
 }

src/main/java/com/cleanroommc/client/ime/WindowsIMEHandler.java

@@ -6,8 +6,10 @@
 import com.sun.jna.platform.win32.WinNT;
 
 import java.util.function.Consumer;
-import java.util.function.Supplier;
 
+/**
+ * Copied from <a href="https://github.com/reserveword/IMBlocker/blob/master/common/src/main/java/io/github/reserveword/imblocker/common/IMManagerWindows.java">IMBlocker</a>
+ */
 public class WindowsIMEHandler implements Consumer<Boolean> {
 
     private static native WinNT.HANDLE ImmGetContext(WinDef.HWND hwnd);