小编Oja*_*jav的帖子

我正在尝试添加一个侦听器，并在 Jetpack Compose 中完成导航转换时接收回调。

我尝试使用 NavController API addOnDestinationChangedListener，但它会立即发送到我的侦听器，并且不会等待合成完成。

val navController = rememberNavController()

// Register the destination changed listener
navController.addOnDestinationChangedListener { _, destination, _ ->
    // destination change is sent immediately and isnt waiting for the composable to finish
}

我的目标是添加一个侦听器，仅在合成完成且目的地更改后才会触发该侦听器。

像这样的东西：

// Register the transition finished listener
navController.transitionFinished{ _, destination ->
    // Do something when the navigation transition has finished
}

    NavHost(navController = navController, startDestination = "Home") {
        composable("Home") { 
            // THE CALLBACK IS FIRED HERE, IMMEDITIETLY
            Text("FIRST SITE") …

我有以下代码:

vector<UINT_PTR> test = GetMemoryAddresses();

cout << "Size: " << test.size() << endl;

for (UINT_PTR a : test) {
    cout << "Memory Address: " << hex  << a << endl;
}

cout << "Size: " << test.size() << endl;

打印以下结果:

Size: 18
Memory Address: fc06a0
Memory Address: 13a70f0
Memory Address: 36c78c1
Memory Address: 3da0ea0
Memory Address: 3e21b80
Memory Address: c0a6881
Memory Address: c747690
Memory Address: c748b98
Memory Address: c74a1b8
Memory Address: c74ce10
Memory Address: c750c78
Memory Address: 1340a10f
Memory Address: …

我想使用这个库见：https : //github.com/jtv/libpqxx

我决定安装这个库管理器 vcpkg 见：https : //github.com/microsoft/vcpkg

我将 CMake 选项设置为“CMake 项目应该使用：”-DCMAKE_TOOLCHAIN_FILE=C:/vcpkg/vcpkg/scripts/buildsystems/vcpkg.cmake”

这是错误：

"C:\Program Files\JetBrains\CLion 2019.1.4\bin\cmake\win\bin\cmake.exe"     -DCMAKE_BUILD_TYPE=Debug -DCMAKE_TOOLCHAIN_FILE=C:/vcpkg/vcpkg/scripts   /buildsystems/vcpkg.cmake -G "CodeBlocks - MinGW Makefiles" C:\Users  \Vaio\CLionProjects\untitled
CMake Warning at C:/vcpkg/vcpkg/scripts/buildsystems/vcpkg.cmake:68   (message):
Unable to determine target architecture, continuing without vcpkg.
Call Stack (most recent call first):
cmake-build-debug-mingw/CMakeFiles/3.14.3/CMakeSystem.cmake:6 (include)
CMakeLists.txt:2 (project)

相应的 CMake 代码是这样的：

if(VCPKG_TARGET_TRIPLET)
elseif(CMAKE_GENERATOR_PLATFORM MATCHES "^[Ww][Ii][Nn]32$")
    set(_VCPKG_TARGET_TRIPLET_ARCH x86)
elseif(CMAKE_GENERATOR_PLATFORM MATCHES "^[Xx]64$")
    set(_VCPKG_TARGET_TRIPLET_ARCH x64)
elseif(CMAKE_GENERATOR_PLATFORM MATCHES "^[Aa][Rr][Mm]$")
    set(_VCPKG_TARGET_TRIPLET_ARCH arm)
elseif(CMAKE_GENERATOR_PLATFORM MATCHES "^[Aa][Rr][Mm]64$")
    set(_VCPKG_TARGET_TRIPLET_ARCH arm64)
else()
    if(CMAKE_GENERATOR MATCHES "^Visual Studio …

我尝试在他使用的地方使用这个答案OnGloballyPositionedModifier，但它没有返回我孩子的正确绝对 Pos。我尝试过positionInWindow()，positionInRoot()。当使用间距时它似乎有效，column但当我使用 时则无效offset。

@Composable
fun GetAbsolutePos(
    content: @Composable () -> Unit,
) {
    Box(modifier = Modifier
        .onGloballyPositioned { coordinates ->
            println("My coordinates: " + coordinates.positionInRoot())
        }
    ) {
        content()
    }

}


@Preview
@Composable
fun test() {
    GetAbsolutePos() {
        Box(
            modifier = Modifier
                .width(PixelToDp(pixelSize = 200))
                .offset(x = PixelToDp(pixelSize = 100), y = PixelToDp(pixelSize = 50))
                .height(PixelToDp(pixelSize = 200))
                .background(Color.Red)
        ) {
            GetAbsolutePos() {
                Column(
                ) {
                    GetAbsolutePos() { …