windows-10kotlin-multiplatformtouchscreensoft-keyboardcompose-desktop

Open up Touch Keyboard on Kotlin Compose Desktop Text Fields Windows 10


I'm having difficulty getting the soft keyboard to automatically show up in a Kotlin Multiplatform with Compose Desktop app on a Windows 10 device set in tablet mode on a Pipo touch screen computer. I can't tell yet if this is a Windows 10 settings problem or a problem in my development.

Here is one of the TextField components. What's wanted is when the user clicks on it, the keyboard pulls up.

var stationName by remember { mutableStateOf(TextFieldValue("")) } 

TextField(
   label = { Text("Enter Computer Station name") },
   value = stationName,
   singleLine = true,
   onValueChange = { stationName = it }
)

I checked some resources to see if I have the right Windows 10 settings. This includes going to Settings -> Devices -> Typing -> "Automatically show the touch keyboard in windowed apps when there's no keyboard attached to your device" set to Yes.

Any advice to resolve this?


Solution

  • What worked is that I used this solution as suggested following the link from @PhilDukhov.

    For posterity, in Kotlin it came out to:

    // build.gradle.kts
    
    implementation("net.java.dev.jna:5.11.0")
    implementation("net.java.dev.jna:jna-platform:5.11.0")
    
    // Keyboard controller
    
    import com.sun.jna.platform.win32.User32
    import com.sun.jna.platform.win32.WinDef
    
    fun showKeyboard() {
       val command = "cmd /c \"C:\\Program Files\\Common Files\\Microsoft Shared\\ink\\TabTip.exe\""
       val process = Runtime.getRuntime().exec(command)
       process.waitFor()
       process.destroy()
    }
    
    fun hideKeyboard() {
       val keyboardClassName = "IPTIP_Main_Window"
       val wmSysCommand = 0x0112
       val scClose = WinDef.WPARAM(0xF060)
       val handle = User32.INSTANCE.FindWindow(keyboardClassName, "")
       if (handle != null) {
          User32.INSTANCE.SendMessage(handle, wmSysCommand, scClose, WinDef.LPARAM(0))
       }
    }