Improve focus handling logic in screen components

Enhance input processing by integrating focus handling checks into key event methods. The focus handler is now consistently retrieved and used, ensuring that only the currently focused component processes key events. This change improves the accuracy and reliability of user interaction with UI components.

Author: ThePandaOliver

common/src/main/java/me/pandamods/pandalib/client/screen/BasePLScreen.java

@@ -62,19 +62,25 @@ public boolean mouseScrolled(double mouseX, double mouseY, double scrollX, doubl
 
 	@Override
 	public boolean keyPressed(int keyCode, int scanCode, int modifiers) {
-		if (this.rootComponent.keyPressed(keyCode, scanCode, modifiers)) return true;
+		FocusHandler focusHandler = this.rootComponent.getFocusHandler();
+		if (focusHandler != null && focusHandler.isFocusing() && focusHandler.getFocusedComponent().keyPressed(keyCode, scanCode, modifiers))
+			return true;
 		return super.keyPressed(keyCode, scanCode, modifiers);
 	}
 
 	@Override
 	public boolean keyReleased(int keyCode, int scanCode, int modifiers) {
-		if (this.rootComponent.keyReleased(keyCode, scanCode, modifiers)) return true;
+		FocusHandler focusHandler = this.rootComponent.getFocusHandler();
+		if (focusHandler != null && focusHandler.isFocusing() && focusHandler.getFocusedComponent().keyReleased(keyCode, scanCode, modifiers))
+			return true;
 		return super.keyReleased(keyCode, scanCode, modifiers);
 	}
 
 	@Override
 	public boolean charTyped(char codePoint, int modifiers) {
-		if (this.rootComponent.charTyped(codePoint, modifiers)) return true;
+		FocusHandler focusHandler = this.rootComponent.getFocusHandler();
+		if (focusHandler != null && focusHandler.isFocusing() && focusHandler.getFocusedComponent().charTyped(codePoint, modifiers))
+			return true;
 		return super.charTyped(codePoint, modifiers);
 	}
 }

common/src/main/java/me/pandamods/pandalib/client/screen/BaseParentUIComponent.java

@@ -56,9 +56,9 @@ public void updateChildState(UIComponent uiComponent) {
 
 	@Override
 	public @Nullable FocusHandler getFocusHandler() {
-		if (this.hasParent()) {
-			return super.getFocusHandler();
-		}
-		return this.focusHandler;
+		FocusHandler focusHandler = super.getFocusHandler();
+		if (focusHandler == null)
+			focusHandler = this.focusHandler;
+		return focusHandler;
 	}
 }

common/src/main/java/me/pandamods/pandalib/client/screen/utils/FocusHandler.java

@@ -14,6 +14,7 @@
 
 import me.pandamods.pandalib.client.screen.core.ParentUIComponent;
 import me.pandamods.pandalib.client.screen.core.UIComponent;
+import org.jetbrains.annotations.Contract;
 import org.jetbrains.annotations.Nullable;
 
 public class FocusHandler {