Allow mouse wheel for chat history scroll

scripts/client/chatbox.js

@@ -107,4 +107,19 @@ function updateChatBox() {
 	}
 }
 
+// ===========================================================================
+
+function processMouseWheelForChatBox(up) {
+	// There isn't a way to detect whether chat input is active, but mouse cursor is forced shown when typing so ¯\_(ツ)_/¯
+	if(!gui.cursorEnabled) {
+		return false;
+	}
+
+	if(up) {
+		chatBoxScrollUp();
+	} else {
+		chatBoxScrollDown()
+	}
+}
+
 // ===========================================================================

scripts/client/event.js

@@ -51,6 +51,8 @@ function addAllEventHandlers() {
 	addEventHandler("OnFocus", onFocus);
 
 	addEventHandler("OnCameraProcess", onCameraProcess);
+
+	addEventHandler("OnMouseWheel", onMouseWheel);
 }
 
 // ===========================================================================
@@ -231,4 +233,22 @@ function onChatOutput(event, messageText, colour) {
 	//receiveChatBoxMessageFromServer(messageText, colour);
 }
 
+// ===========================================================================
+
+function onMouseWheel(event, mouseId, deltaCoordinates, flipped) {
+	if(!flipped) {
+		if(deltaCoordinates.y > 0) {
+			processMouseWheelForChatBox(true);
+		} else {
+			processMouseWheelForChatBox(false);
+		}
+	} else {
+		if(deltaCoordinates.y > 0) {
+			processMouseWheelForChatBox(false);
+		} else {
+			processMouseWheelForChatBox(true);
+		}
+	}
+}
+
 // ===========================================================================