ddmyx/scripts/Interaction/Interaction.gml

/// @desc 对句柄进行每帧例行初始化.
function _handle_init(){
	if (!variable_global_exists("input_handles_list")) global.input_handles_list = [];
	global.input_consumed = {}; 

	var _max_priority = 0;
	for(var i = 0; i < array_length(global.input_handles_list); i++){
		var _ch = global.input_handles_list[i];
		if(_ch.active){
			_max_priority = max(_max_priority, _ch.priority);
		}
	}
	global.current_priority = _max_priority
}

/// @desc 尝试对按键进行消费
/// @param {Constant.VirtualKey|Real} _key 检测的键盘按键
/// @param {Constant.Real} _priority 当前句柄的优先级
function _try_input_consume(_key, _priority){
	//如果低于最高优先级 且 非debugger级优先级( -1 ), 则拒绝访问
	if(_priority < global.current_priority && _priority != -1) return false;
	
	//同一帧内已经被同级句柄/更高级句柄访问( 消费 ), 则拒绝访问
	var _key_id = string(_key);
	if (struct_exists(global.input_consumed, _key_id)) return false;
	
	return true;
}	

/// @desc 强制消费给定键盘按键
/// @param {Constant.VirtualKey|Real} _key 检测的键盘按键
function _force_input_consume(_key){
    var _id = key_get_id(_key);
    global.input_consumed[$ string(_id)] = true;
}

/// @desc 优雅地检测此帧某给定键盘按键是否被按住
/// @desc 使用{HandleName}.kc()而非此函数
/// @param {Constant.VirtualKey|Real} _key 检测的键盘按键
/// @param {Constant.Real} _priority 当前句柄的优先级
function _kc(_key, _priority = 0)
{
    var _id = key_get_id(_key);
    if (_try_input_consume(_id, _priority) && keyboard_check(_id)) {
        //判定成功则对按键进行消费
        global.input_consumed[$ string(_id)] = true; 
        return true;
    }
    return false;
}  
/// @desc 优雅地检测此帧某给定键盘按键是否被按住
/// @desc 使用{HandleName}.kcp()而非此函数
/// @param {Constant.VirtualKey|Real} _key 检测的键盘按键
/// @param {Constant.Real} _priority 当前句柄的优先级
function _kcp( _key, _priority = 0) {
    var _id = key_get_id(_key);
    if (_try_input_consume(_id, _priority) && keyboard_check_pressed(_id)) {
        //判定成功则对按键进行消费
        global.input_consumed[$ string(_id)] = true; 
        return true;
    }
    return false;
}
/// @desc 优雅地检测此帧某给定键盘按键是否被松开
/// @desc 使用{HandleName}.kcr()而非此函数
/// @param {Constant.VirtualKey|Real} _key 检测的键盘按键
/// @param {Constant.Real} _priority 当前句柄的优先级
function _kcr(_key, _priority = 0) {
    var _id = key_get_id(_key);
    if (_try_input_consume(_id, _priority) && keyboard_check_released(_id)) {
        //判定成功则对按键进行消费
        global.input_consumed[$ string(_id)] = true; 
        return true;
    }
    return false;
}

function input_handle(_name, _priority) constructor {
	name = _name;
	priority = _priority;
	// 理论上，你不应该修改active来控制启用情况，而是使用标准的注册注销流程
	active = true;
	
	if (!variable_global_exists("input_handles_list")) global.input_handles_list = [];
	array_push(global.input_handles_list, self);
	
	/// @desc 优雅地检测此帧某给定键盘按键是否被按住
	/// @desc priority继承自其句柄
	/// @param {Constant.VirtualKey|Real} _key 检测的键盘按键
    static kc = function(_key) {
        if (!active) return false;
        // 自动将自己的 priority 传给底层函数
        return _kc(_key, self.priority);
    }

	/// @desc 优雅地检测此帧某给定键盘按键是否被按住
	/// @desc priority继承自其句柄
	/// @param {Constant.VirtualKey|Real} _key 检测的键盘按键
    static kcp = function(_key) {
        if (!active) return false;
        return _kcp(_key, self.priority);
    }

	/// @desc 优雅地检测此帧某给定键盘按键是否被松开
	/// @desc priority继承自其句柄
	/// @param {Constant.VirtualKey|Real} _key 检测的键盘按键
    static kcr = function(_key) {
        if (!active) return false;
        return _kcr(_key, self.priority);
    }
	
	/// @desc 注销当前句柄
    static destroy = function() {
		if (!variable_global_exists("input_handles_list")) return;
		
        var _len = array_length(global.input_handles_list);
        for (var i = 0; i < _len; i++) {
            if (global.input_handles_list[i] == self) {
                array_delete(global.input_handles_list, i, 1);
                break;
            }
        }
    }
}