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移植 AWTK 到纯血鸿蒙 (HarmonyOS NEXT) 系统 (6) - 触屏事件

news 2024/11/5 13:29:15

AWTK 作为一个GUI引擎，自然少不了对触屏事件的支持。这里我们先支持单点触摸，后续再支持多点手势。

1. 注册 XComponent 的触屏事件回调

这个在 AppNapi 的构造函数中完成：

AppNapi::AppNapi(std::string &id) {id_ = id;component_ = nullptr;auto appCallback = AppNapi::GetNXComponentCallback();appCallback->OnSurfaceCreated = OnSurfaceCreatedCB;appCallback->OnSurfaceChanged = OnSurfaceChangedCB;appCallback->OnSurfaceDestroyed = OnSurfaceDestroyedCB;appCallback->DispatchTouchEvent = DispatchTouchEventCB;auto appMouseEventCallback = AppNapi::GetNXComponentMouseEventCallback();appMouseEventCallback->DispatchMouseEvent = DispatchMouseEventCB;awtk_app_ = new AwtkApp(id);
}

2. 在触屏事件的回调函数中，将事件分发给 awtk_app

事件需要根据当前屏幕的缩放比例，转换为 awtk 的坐标系。

void AppNapi::DispatchTouchEvent(OH_NativeXComponent *component, void *window) {int32_t ret = OH_NativeXComponent_GetTouchEvent(component, window, &touchEvent_);if (ret == OH_NATIVEXCOMPONENT_RESULT_SUCCESS) {double dpr = awtk_app_->GetDevicePixelRatio();int x = touchEvent_.x / dpr;int y = touchEvent_.y / dpr;int button = 0;switch (touchEvent_.type) {case OH_NATIVEXCOMPONENT_DOWN: {awtk_app_->DispatchPointerDown(button, x, y);break;}case OH_NATIVEXCOMPONENT_MOVE: {awtk_app_->DispatchPointerMove(button, x, y);break;}case OH_NATIVEXCOMPONENT_UP: {awtk_app_->DispatchPointerUp(button, x, y);break;}default: {break;}}} else {LOGE("Touch fail");}
}

3. 将事件注入主循环

void AwtkApp::DispatchPointerDown(int button, int x, int y) {mPressed = true;pointer_event_t event;widget_t *widget = window_manager();pointer_event_init(&event, EVT_POINTER_DOWN, widget, x, y);event.pressed = mPressed;event.button = button;event_queue_req_t r;memset(&r, 0x00, sizeof(r));r.pointer_event = event;main_loop_queue_event(main_loop(), &r);
}