Refactor related codes to NativeTouchHandler

Limelight/Input/NativeTouchHandler.m

@@ -0,0 +1,75 @@
+//
+//  NativeTouchHandler.m
+//  Moonlight
+//
+//  Created by ZWM on 2024/5/14.
+//  Copyright © 2024 Moonlight Game Streaming Project. All rights reserved.
+//
+
+#import <Foundation/Foundation.h>
+
+#import "NativeTouchHandler.h"
+
+#include <Limelight.h>
+
+
+// Use a Dictionary to store UITouch object's memory address as key, and pointerId as value,字典存放UITouch对象地址和pointerId映射关系
+// pointerId will be generated from electronic noise, by arc4_random, pointerId,由随机噪声生成
+// Use a NSSet store pointerId, for quick repeition inquiry, NSSet存放活跃的pointerId合集,用于快速查找,以防重复.
+static NSMutableDictionary *pointerIdDict; //pointerId Dict for native touch.
+static NSMutableSet<NSNumber *> *pointerIdSet; //pointerIdSet for native touch.
+
+@implementation NativeTouchHandler {
+    StreamView* view;
+}
+
+- (id)initWithView:(StreamView*)view {
+    self = [self init];
+    self->view = view;
+    return self;
+}
+
+
++ (NSMutableDictionary* )initializePointerIdDict {
+    return pointerIdDict = [NSMutableDictionary dictionary];
+}
+
++ (NSMutableSet* )initializePointerIdSet {
+    return pointerIdSet = [NSMutableSet set];
+}
+
+
+// 随机生成pointerId并填入NSDict和NSSet
+// generate & populate pointerId into NSDict & NSSet, called in UITouchPhaseBegan
++ (void)populatePointerId:(UITouch*)event{
+    uint64_t eventAddrValue = (uint64_t)event;
+    uint32_t randomPointerId = arc4random_uniform(UINT32_MAX); // generate pointerId from eletronic noise.
+    while(true){
+        if([pointerIdSet containsObject:@(randomPointerId)]) randomPointerId = arc4random_uniform(UINT32_MAX); // in case of new pointerId collides with existing ones, generate again.
+        else{ // populate pointerId into NSDict & NSSet.
+            [pointerIdDict setObject:@(randomPointerId) forKey:@(eventAddrValue)];
+            [pointerIdSet addObject:@(randomPointerId)];
+            return;
+        }
+    }
+}
+
+// remove pointerId in UITouchPhaseEnded condition
++ (void)removePointerId:(UITouch*)event{
+    uint64_t eventAddrValue = (uint64_t)event;
+    NSNumber* pointerIdObj = [pointerIdDict objectForKey:@(eventAddrValue)];
+    if(pointerIdObj != nil){
+        [pointerIdSet removeObject:pointerIdObj];
+        [pointerIdDict removeObjectForKey:@(eventAddrValue)];
+    }
+}
+
+// 从字典中获取UITouch事件对应的pointerId
+// call this only when NSDcit & NSSet is up-to-date.
++ (uint32_t) retrievePointerIdFromDict:(UITouch*)event{
+    return [[pointerIdDict objectForKey:@((uint64_t)event)] unsignedIntValue];
+}
+
+
+
+@end