add inputmethod

Signed-off-by: zhouyongfei <zhouyongfei@huawei.com>

frameworks/inputmethod_ability/src/event_target.cpp

@@ -0,0 +1,182 @@
+/*
+ * Copyright (c) 2021 Huawei Device Co., Ltd.
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include "event_target.h"
+
+#include "securec.h"
+
+#include "utils/log.h"
+#include "input_method_ability.h"
+#define LISTENER_TYPTE_MAX_LENGTH 64
+namespace OHOS {
+namespace MiscServices {
+    struct EventListener {
+        char type[LISTENER_TYPTE_MAX_LENGTH] = { 0 };
+        bool isOnce = false;
+        napi_ref handlerRef = nullptr;
+        EventListener* back = nullptr;
+        EventListener* next = nullptr;
+    };
+    EventTarget::EventTarget(napi_env env, napi_value thisVar) {
+        IMSA_HILOGI("EventTarget::EventTarget");
+        env_ = env;
+        first_ = last_ = nullptr;
+        thisVarRef_ = nullptr;
+        napi_create_reference(env, thisVar, 1, &thisVarRef_);
+    }
+
+    EventTarget::~EventTarget() {
+        EventListener* temp = nullptr;
+        for (EventListener* i = first_; i != nullptr; i = temp) {
+            temp = i->next;
+            if (i == first_) {
+                first_ = first_->next;
+            } else if (i == last_) {
+                last_ = last_->back;
+            } else {
+                i->next->back = i->back;
+                i->back->next = i->next;
+            }
+            napi_delete_reference(env_, i->handlerRef);
+            delete i;
+        }
+        napi_delete_reference(env_, thisVarRef_);
+    }
+
+    void EventTarget::On(const char* type, napi_value handler)
+    {
+        IMSA_HILOGI("EventTarget::On");
+        auto tmp = new EventListener();
+
+        if (strncpy_s(tmp->type, LISTENER_TYPTE_MAX_LENGTH, type, strlen(type)) == -1) {
+            delete tmp;
+            tmp = nullptr;
+            return;
+        }
+
+        if (first_ == nullptr) {
+            first_ = last_ = tmp;
+        } else {
+            last_->next = tmp;
+            last_->next->back = last_;
+            last_ = last_->next;
+        }
+        last_->isOnce = false;
+        napi_create_reference(env_, handler, 1, &last_->handlerRef);
+    }
+
+    void EventTarget::Once(const char* type, napi_value handler)
+    {
+        IMSA_HILOGI("EventTarget::Once");
+        auto tmp = new EventListener();
+
+        if (strncpy_s(tmp->type, LISTENER_TYPTE_MAX_LENGTH, type, strlen(type)) == -1) {
+            delete tmp;
+            tmp = nullptr;
+            return;
+        }
+
+        if (first_ == nullptr) {
+            first_ = last_ = tmp;
+        } else {
+            last_->next = tmp;
+            last_->next->back = last_;
+            last_ = last_->next;
+        }
+        last_->isOnce = true;
+        napi_create_reference(env_, handler, 1, &last_->handlerRef);
+    }
+
+    void EventTarget::Off(const char* type, napi_value handler)
+    {
+        IMSA_HILOGI("EventTarget::Off");
+        napi_handle_scope scope = nullptr;
+        napi_open_handle_scope(env_, &scope);
+        if (scope == nullptr) {
+            HILOG_ERROR("scope is nullptr");
+            return;
+        }
+
+        EventListener* temp = nullptr;
+        for (EventListener* eventListener = first_; eventListener != nullptr; eventListener = temp) {
+            temp = eventListener->next;
+            bool isEquals = false;
+            napi_value handlerTemp = nullptr;
+            napi_get_reference_value(env_, eventListener->handlerRef, &handlerTemp);
+            napi_strict_equals(env_, handlerTemp, handler, &isEquals);
+            if (strcmp(eventListener->type, type) == 0 && isEquals) {
+                if (eventListener == first_) {
+                    first_ = first_->next;
+                } else if (eventListener == last_) {
+                    last_ = last_->back;
+                } else {
+                    eventListener->next->back = eventListener->back;
+                    eventListener->back->next = eventListener->next;
+                }
+                napi_delete_reference(env_, eventListener->handlerRef);
+                delete eventListener;
+                eventListener = nullptr;
+                break;
+            }
+        }
+        napi_close_handle_scope(env_, scope);
+    }
+
+    void EventTarget::Off(const char* type)
+    {
+        IMSA_HILOGI("EventTarget::Off");
+        EventListener* temp = nullptr;
+        for (EventListener* eventListener = first_; eventListener != nullptr; eventListener = temp) {
+            temp = eventListener->next;
+            if (strcmp(eventListener->type, type) == 0) {
+                if (eventListener == first_) {
+                    first_ = first_->next;
+                } else if (eventListener == last_) {
+                    last_ = last_->back;
+                } else {
+                    eventListener->next->back = eventListener->back;
+                    eventListener->back->next = eventListener->next;
+                }
+                napi_delete_reference(env_, eventListener->handlerRef);
+                delete eventListener;
+                eventListener = nullptr;
+            }
+        }
+    }
+
+    void EventTarget::Emit(const char* type, Event* event)
+    {
+        IMSA_HILOGI("EventTarget::Emit");
+        napi_handle_scope scope = nullptr;
+        napi_open_handle_scope(env_, &scope);
+
+        napi_value thisVar = nullptr;
+        napi_get_reference_value(env_, thisVarRef_, &thisVar);
+        for (EventListener* eventListener = first_; eventListener != nullptr; eventListener = eventListener->next) {
+            if (strcmp(eventListener->type, type) == 0) {
+                napi_value jsEvent = event ? event->ToJsObject() : nullptr;
+                napi_value handler = nullptr;
+                napi_value result = nullptr;
+                napi_get_reference_value(env_, eventListener->handlerRef, &handler);
+                napi_call_function(env_, thisVar, handler, jsEvent ? 1 : 0, jsEvent ? &jsEvent : nullptr, &result);
+                if (eventListener->isOnce) {
+                    Off(type, handler);
+                }
+            }
+        }
+        napi_close_handle_scope(env_, scope);
+    }
+}
+}