1 /*
2  * Copyright (c) 2023 Huawei Device Co., Ltd.
3  * Licensed under the Apache License, Version 2.0 (the "License");
4  * you may not use this file except in compliance with the License.
5  * You may obtain a copy of the License at
6  *
7  *     http://www.apache.org/licenses/LICENSE-2.0
8  *
9  * Unless required by applicable law or agreed to in writing, software
10  * distributed under the License is distributed on an "AS IS" BASIS,
11  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
12  * See the License for the specific language governing permissions and
13  * limitations under the License.
14  */
15 #ifndef OHOS_INPUT_CALLBACK_HANDLER_H
16 #define OHOS_INPUT_CALLBACK_HANDLER_H
17 
18 #include <functional>
19 #include "inputmethod_trace.h"
20 #include "js_callback_object.h"
21 #include "js_util.h"
22 #include "napi/native_api.h"
23 #include "napi/native_node_api.h"
24 
25 namespace OHOS {
26 namespace MiscServices {
27 class JsCallbackHandler {
28 public:
29     using ArgvProvider = std::function<bool(napi_env, napi_value *, size_t)>;
30     struct ArgContainer {
31         size_t argc{ 0 };
32         ArgvProvider argvProvider{ nullptr };
33     };
34     // 0 means the callback has no param.
35     static void Traverse(const std::vector<std::shared_ptr<JSCallbackObject>> &objects,
36         const ArgContainer &argContainer = { 0, nullptr })
37     {
38         InputMethodSyncTrace tracer("Traverse callback");
39         for (const auto &object : objects) {
40             if (object == nullptr) {
41                 continue;
42             }
43             JsUtil::ScopeGuard scopeGuard(object->env_);
44             napi_value jsOutput = nullptr;
45             Execute(object, argContainer, jsOutput);
46         }
47     }
48     template<typename T>
Traverse(const std::vector<std::shared_ptr<JSCallbackObject>> & objects,const ArgContainer & argContainer,T & output)49     static void Traverse(
50         const std::vector<std::shared_ptr<JSCallbackObject>> &objects, const ArgContainer &argContainer, T &output)
51     {
52         InputMethodSyncTrace tracer("Traverse callback with output");
53         for (const auto &object : objects) {
54             JsUtil::ScopeGuard scopeGuard(object->env_);
55             napi_value jsOutput = nullptr;
56             Execute(object, argContainer, jsOutput);
57             if (jsOutput != nullptr && JsUtil::GetValue(object->env_, jsOutput, output)) {
58                 break;
59             }
60         }
61     }
62 
63 private:
64     static void Execute(
65         const std::shared_ptr<JSCallbackObject> &object, const ArgContainer &argContainer, napi_value &output);
66 };
67 } // namespace MiscServices
68 } // namespace OHOS
69 #endif // OHOS_INPUT_CALLBACK_HANDLER_H
70