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OpenHarmony系統(tǒng)解決方案—輸入法彈出時按返回鍵原頁面返回或應(yīng)用退出

作者：TiZizzz
系統(tǒng) OpenHarmony
由于輸入法應(yīng)用是InputMethodExtensionAbility，窗口由自己創(chuàng)建，所以返回按鍵的鍵值指令會被傳遞到原有應(yīng)用上，執(zhí)行原有應(yīng)用的返回邏輯。而輸入法本身可以控制此邏輯，但現(xiàn)在OpenHarmony中的示例輸入法并未控制此邏輯，造成問題。

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問題描述

問題環(huán)境

系統(tǒng)版本：OpenHarmony-3.2-Release

問題現(xiàn)象

  • 打開任意包含輸入組件界面的應(yīng)用，點擊輸入組件彈出輸入法。
  • 點擊返回按鍵。
  • 輸入法隱藏，原應(yīng)用頁面返回或應(yīng)用退出。

異常效果

點擊返回按鍵，輸入法隱藏，原應(yīng)用頁面返回或應(yīng)用退出。

OpenHarmony系統(tǒng)解決方案 - 輸入法彈出時按返回鍵原頁面返回或應(yīng)用退出-開源基礎(chǔ)軟件社區(qū)OpenHarmony系統(tǒng)解決方案 - 輸入法彈出時按返回鍵原頁面返回或應(yīng)用退出-開源基礎(chǔ)軟件社區(qū)

正常效果

點擊返回按鍵，僅隱藏輸入法。

OpenHarmony系統(tǒng)解決方案 - 輸入法彈出時按返回鍵原頁面返回或應(yīng)用退出-開源基礎(chǔ)軟件社區(qū)OpenHarmony系統(tǒng)解決方案 - 輸入法彈出時按返回鍵原頁面返回或應(yīng)用退出-開源基礎(chǔ)軟件社區(qū)

問題原因

由于輸入法應(yīng)用是InputMethodExtensionAbility，窗口由自己創(chuàng)建，所以返回按鍵的鍵值指令會被傳遞到原有應(yīng)用上，執(zhí)行原有應(yīng)用的返回邏輯。而輸入法本身可以控制此邏輯，但現(xiàn)在OpenHarmony中的示例輸入法并未控制此邏輯，造成問題。

解決方案

輸入法應(yīng)用監(jiān)聽鍵盤事件時需對返回按鍵做特殊處理，返回鍵的keyCode為2。

let keyboardDelegate = inputMethodEngine.getKeyboardDelegate();
keyboardDelegate.on('keyUp', (keyEvent) {
  if (keyEvent.keyCode === 2) {
    return true;
  }
});

以KikaInput輸入法應(yīng)用為例，修改keyboardDelegate的keyDown和keyUp的兩個監(jiān)聽回調(diào)。

修改應(yīng)用工程內(nèi)文件，路徑：entry\src\main\ets\model\KeyboardController.ets

this.mKeyboardDelegate.on('keyDown', (keyEvent) => {
  if (this.isKeyboardShow && keyEvent.keyCode !== 2) {
    this.inputHandle.hideKeyboardSelf();
  }
  this.inputHandle.addLog('keyDown: code = ' + keyEvent.keyCode);
  let result = this.onKeyDown(keyEvent);
  this.inputHandle.addLog('keyDown: result = ' + result);
  return result
});

this.mKeyboardDelegate.on('keyUp', (keyEvent) => {
  this.inputHandle.addLog('keyUp: code = ' + keyEvent.keyCode);
  if (this.isKeyboardShow && keyEvent.keyCode === 2) {
    this.inputHandle.hideKeyboardSelf();
    return true;
  }
  let result = this.onKeyUp(keyEvent);
  this.inputHandle.addLog('keyUp: result = ' + result);
  return result
});

定位過程

抓取點擊返回按鍵時Ace的Log日志，發(fā)現(xiàn)在點擊返回時觸發(fā)了原應(yīng)用的ProcessBackPressed函數(shù)，導(dǎo)致原頁面返回或應(yīng)用退出。

08-05 23:44:44.248  1718  1718 I C03900/Ace: [ui_content_impl.cpp(ProcessKeyEvent)-(-1)] UIContentImpl: OnKeyUp called,touchEvent info: keyCode is 2,keyAction is 2, keyActionTime is 60014731
08-05 23:44:44.248  1287  1287 I C03900/Ace: [pan_recognizer.cpp(HandleTouchDownEvent)-(3)] pan recognizer receives 0 touch down event, begin to detect pan event
08-05 23:44:44.248  1287  1287 I C03900/Ace: [flutter_ace_view.cpp(operator())-(3)] Mark 0 id Touch Event Processed
08-05 23:44:44.250  1718  1718 I C03900/Ace: [event_manager.cpp(DispatchKeyEventNG)-(0)] Use platform to handle this event
08-05 23:44:44.260  1718  1757 I C03900/Ace: [on_text_changed_listener_impl.cpp(SendKeyboardInfo)-(-1)] [OnTextChangedListenerImpl] KeyboardStatus status: 1
08-05 23:44:44.260  1718  1757 I C03900/Ace: [on_text_changed_listener_impl.cpp(HandleFunctionKey)-(-1)] [OnTextChangedListenerImpl] Handle function key 0
08-05 23:44:44.260  1718  1718 E C03900/Ace: [on_text_changed_listener_impl.cpp(operator())-(0)] TextInputAction  is not support: 0
08-05 23:44:44.277  1718  1720 I C03900/Ace: [ui_content_impl.cpp(OnSizeChange)-(-1)] UIContent::OccupiedAreaChange rect:Rect (0.00, 0.00) - [0.00 x 0.00] type: 0
08-05 23:44:44.282  1584  1584 I C03900/Ace: [ui_content_impl.cpp(Background)-(-1)] UIContentImpl: window background
08-05 23:44:44.282  1718  1718 I C03900/Ace: [pipeline_context.cpp(OnVirtualKeyboardHeightChange)-(0)] OnVirtualKeyboardAreaChange positionY:46.000000 safeArea:1136.000000 offsetFix:-545.000000, keyboardHeight 0.000000
08-05 23:44:44.282  1584  1584 I C03900/Ace: [jsi_declarative_engine.cpp(UpdateApplicationState)-(0)] JsiDeclarativeEngine UpdateApplicationState, packageName , state: 3
08-05 23:44:44.282  1718  1718 I C03900/Ace: [pipeline_context.cpp(SetRootRect)-(0)] SetRootRect width 720.000000, height 1136.000000, 0.000000
08-05 23:44:44.289  1584  1584 I C03900/Ace: [pipeline_context.cpp(OnVirtualKeyboardHeightChange)-(0)] OnVirtualKeyboardAreaChange positionY:0.000000 safeArea:550.000000 offsetFix:-275.000000
08-05 23:44:44.298  1584  1584 I C03900/Ace: [pipeline_context.cpp(FlushAnimation)-(0)] scheduleTasks size
08-05 23:44:44.335  1287  1287 I C03900/Ace: [pan_recognizer.cpp(HandleTouchUpEvent)-(3)] pan recognizer receives 0 touch up event
08-05 23:44:44.335  1718  1718 I C03900/Ace: [ui_content_impl.cpp(ProcessBackPressed)-(-1)] UIContentImpl: ProcessBackPressed: Platform::AceContainer::OnBackPressed called
08-05 23:44:44.335  1718  1718 I C03900/Ace: [ui_content_impl.cpp(ProcessBackPressed)-(-1)] UIContentImpl::ProcessBackPressed AceContainer
08-05 23:44:44.336  1718  1718 W C03900/Ace: [pipeline_context.cpp(GetNavDestinationBackButtonNode)-(0)] navigationNode is null, return on line 725
08-05 23:44:44.337  1718  1718 E C03900/Ace: [js_view_functions.cpp(ExecuteFunctionWithReturn)-(0)] Error calling onBackPress
08-05 23:44:44.340  1718  1718 W C03900/Ace: [grid_container_info.cpp(BuildColumnWidth)-(0)] container width not changed.
08-05 23:44:44.358  1718  1718 W C03900/Ace: [grid_container_info.cpp(BuildColumnWidth)-(0)] container width not changed.
08-05 23:44:44.360  1287  1287 I C03900/Ace: [flutter_ace_view.cpp(operator())-(3)] Mark 0 id Touch Event Processed
08-05 23:44:44.363  1718  1718 W C03900/Ace: [rosen_render_context.cpp(ClearFocusState)-(0)] focusStateModifier_ is null, return on line 1083
08-05 23:44:44.377  1718  1718 I C03900/Ace: [pipeline_context.cpp(OnBackPressed)-(0)] CallRouterBackToPopPage(): frontend accept
08-05 23:44:44.377  1718  1718 I C03900/Ace: [ui_content_impl.cpp(ProcessBackPressed)-(-1)] UIContentImpl::ProcessBackPressed AceContainer return true
08-05 23:44:44.381  1718  1718 W C03900/Ace: [grid_container_info.cpp(BuildColumnWidth)-(0)] container width not changed.
08-05 23:44:44.397  1718  1718 W C03900/Ace: [grid_container_info.cpp(BuildColumnWidth)-(0)] container width not changed.
08-05 23:44:44.407  1718  1718 W C03900/Ace: [rosen_render_context.cpp(ClearFocusState)-(0)] focusStateModifier_ is null, return on line 1083
08-05 23:44:44.745  1718  1718 I C03900/Ace: [stage_manager.cpp(operator())-(0)] pageTransition in finish
08-05 23:44:44.746  1718  1718 I C03900/Ace: [stage_manager.cpp(operator())-(0)] pageTransition exit finish

追蹤返回邏輯，發(fā)現(xiàn)是在窗口子系統(tǒng)返回事件回調(diào)中觸發(fā)。

// foundation/window/window_manager/wm/src/window_impl.cpp
void WindowImpl::HandleBackKeyPressedEvent(const std::shared_ptr<MMI::KeyEvent>& keyEvent){
    std::shared_ptr<IInputEventConsumer> inputEventConsumer;
    {
        std::lock_guard<std::recursive_mutex> lock(mutex_);
        inputEventConsumer = inputEventConsumer_;
    }
    bool isConsumed = false;
    if (inputEventConsumer != nullptr) {
        WLOGFD("Transfer back key event to inputEventConsumer");
        isConsumed = inputEventConsumer->OnInputEvent(keyEvent);
    } else if (uiContent_ != nullptr) {
        WLOGFD("Transfer back key event to uiContent");
        isConsumed = uiContent_->ProcessBackPressed();
    } else {
        WLOGFE("There is no back key event consumer");
    }
    ···
}

抓取窗口子系統(tǒng)日志，發(fā)現(xiàn)窗口子系統(tǒng)會把鍵值分發(fā)到輸入法（dispatch keyEvent to input method）后再分解輸入法的返回分發(fā)到Ace（dispatch keyEvent to ACE）中進(jìn)行處理，當(dāng)按鍵抬起時會觸發(fā)ProcessBackPressed函數(shù)。

08-05 23:59:52.185  1287  1287 D C04200/WindowInputChannel: <78>HandlePointerEvent: Receive pointer event, windowId: 7, action: 2
08-05 23:59:52.186  1287  1287 D C04200/WindowImpl: <2526>ConsumePointerEvent: WMS process point down, window: [name:SystemUi_NavigationBar, id:7], action: 2
08-05 23:59:52.191  1287  1287 D C04200/WindowImpl: <2443>TransferPointerEvent: Transfer pointer event to uiContent
08-05 23:59:52.219  1718  1718 D C04200/WindowInputChannel: <44>HandleKeyEvent: Receive key event, windowId: 12, keyCode: 2
08-05 23:59:52.219  1718  1718 I C04200/WindowInputChannel: <104>IsKeyboardEvent: isKeyFN: 0, isKeyboard: 0
08-05 23:59:52.219  1718  1718 I C04200/WindowInputChannel: <61>HandleKeyEvent: dispatch keyEvent to input method
08-05 23:59:52.224  1718  1718 I C04200/WindowInputChannel: <66>HandleKeyEvent: dispatch keyEvent to ACE
08-05 23:59:52.224  1718  1718 D C04200/WindowImpl: <2161>ConsumeKeyEvent: KeyCode: 2, action: 2
08-05 23:59:52.224  1718  1718 D C04200/WindowImpl: <2174>ConsumeKeyEvent: Transfer key event to uiContent
08-05 23:59:52.235  1584  1584 D C04200/WindowImpl: <1376>Hide: [Client] Window [name:imeWindow, id:5] Hide, reason:0, withAnimation:0
08-05 23:59:52.236  1584  1592 D C04200/WindowImpl: <2749>UpdateActiveStatus: window active status: 0, id: 5
08-05 23:59:52.237  1718  1720 D C04200/WindowImpl: <2749>UpdateActiveStatus: window active status: 1, id: 12
08-05 23:59:52.237  1718  1720 D C04200/WindowImpl: <2743>UpdateOccupiedAreaChangeInfo: Window Update OccupiedArea, id: 12
08-05 23:59:52.284  1287  1287 D C04200/WindowInputChannel: <78>HandlePointerEvent: Receive pointer event, windowId: 7, action: 4
08-05 23:59:52.284  1287  1287 D C04200/WindowImpl: <2416>ConsumeMoveOrDragEvent: [Client Point Up/Cancel]: windowId: 7, action: 4, sourceType: 2, startMove: 0, startDrag: 0
08-05 23:59:52.284  1287  1287 D C04200/WindowImpl: <2443>TransferPointerEvent: Transfer pointer event to uiContent
08-05 23:59:52.308  1718  1718 D C04200/WindowInputChannel: <44>HandleKeyEvent: Receive key event, windowId: 12, keyCode: 2
08-05 23:59:52.308  1718  1718 I C04200/WindowInputChannel: <104>IsKeyboardEvent: isKeyFN: 0, isKeyboard: 0
08-05 23:59:52.308  1718  1718 I C04200/WindowInputChannel: <61>HandleKeyEvent: dispatch keyEvent to input method
08-05 23:59:52.320  1718  1718 I C04200/WindowInputChannel: <66>HandleKeyEvent: dispatch keyEvent to ACE
08-05 23:59:52.321  1718  1718 D C04200/WindowImpl: <2161>ConsumeKeyEvent: KeyCode: 2, action: 3
08-05 23:59:52.321  1718  1718 D C04200/WindowImpl: <2129>HandleBackKeyPressedEvent: Transfer back key event to uiContent
08-05 23:59:52.362  1718  1718 D C04200/WindowImpl: <2135>HandleBackKeyPressedEvent: Back key event is consumed or it is not a main window
08-05 23:59:52.731  1584  1584 D C04200/WindowImpl: <1376>Hide: [Client] Window [name:imeWindow, id:5] Hide, reason:0, withAnimation:0
08-05 23:59:52.731  1584  1584 D C04200/WindowImpl: <1389>Hide: window is already hidden id: 5
08-05 23:59:52.736  1584  1584 D C04200/WindowImpl: <1376>Hide: [Client] Window [name:imeWindow, id:5] Hide, reason:0, withAnimation:0
08-05 23:59:52.736  1584  1584 D C04200/WindowImpl: <1389>Hide: window is already hidden id: 5

根據(jù)上述日志查看分發(fā)代碼邏輯，發(fā)現(xiàn)如果輸入法在分發(fā)按鍵事件時，如果返回true則事件不會再向Ace分發(fā)。

// foundation/window/window_manager/wm/src/window_input_channel.cpp
void WindowInputChannel::HandleKeyEvent(std::shared_ptr<MMI::KeyEvent>& keyEvent)
{
    ···
    bool inputMethodHasProcessed = false;
#ifdef IMF_ENABLE
    bool isKeyboardEvent = IsKeyboardEvent(keyEvent);
    if (isKeyboardEvent) {
        WLOGFI("dispatch keyEvent to input method");
        inputMethodHasProcessed = MiscServices::InputMethodController::GetInstance()->dispatchKeyEvent(keyEvent);
    }
#endif // IMF_ENABLE
    if (!inputMethodHasProcessed) {
        WLOGFI("dispatch keyEvent to ACE");
        window_->ConsumeKeyEvent(keyEvent);
    }
}

追蹤輸入法分發(fā)事件代碼，發(fā)現(xiàn)返回值是觸發(fā)keyboardDelegate.on(type)回調(diào)后返回的值。而keyboardDelegate在輸入法應(yīng)用中被使用，所以改動輸入法應(yīng)用的回調(diào)邏輯即可修復(fù)此現(xiàn)象。

// base/inputmethod/imf/interfaces/kits/js/napi/inputmethodability/js_keyboard_delegate_setting.cpp
bool JsKeyboardDelegateSetting::OnKeyEvent(int32_t keyCode, int32_t keyStatus){
    IMSA_HILOGD("run in");
    KeyEventPara para{ keyCode, keyStatus, false };
    std::string type = (keyStatus == ARGC_TWO ? "keyDown" : "keyUp");
    auto isDone = std::make_shared<BlockData<bool>>(MAX_TIMEOUT, false);
    uv_work_t *work = GetUVwork(type, [?, isDone](UvEntry &entry) {
        entry.keyEventPara = { para.keyCode, para.keyStatus, para.isOnKeyEvent };
        entry.isDone = isDone;
    });
    if (work == nullptr) {
        IMSA_HILOGE("failed to get uv work");
        return false;
    }
    uv_queue_work(
        loop_, work, [](uv_work_t *work) {},
        [](uv_work_t *work, int status) {
            std::shared_ptr<UvEntry> entry(static_cast<UvEntry *>(work->data), [work](UvEntry *data) {
                delete data;
                delete work;
            });
            auto getKeyEventProperty = [entry](napi_value *args, uint8_t argc,
                                           std::shared_ptr<JSCallbackObject> item) -> bool {
                if (argc == 0) {
                    return false;
                }
                napi_value jsObject =
                    GetResultOnKeyEvent(item->env_, entry->keyEventPara.keyCode, entry->keyEventPara.keyStatus);
                if (jsObject == nullptr) {
                    IMSA_HILOGE("get GetResultOnKeyEvent failed: jsObject is nullptr");
                    return false;
                }
                args[ARGC_ZERO] = { jsObject };
                return true;
            };
            bool isOnKeyEvent = JsUtils::TraverseCallback(entry->vecCopy, ARGC_ONE, getKeyEventProperty);
            entry->isDone->SetValue(isOnKeyEvent);
        });
    return isDone->GetValue();
}

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責(zé)任編輯：jianghua 來源： 51CTO 開源基礎(chǔ)軟件社區(qū)
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