<https://blog.jetbrains.com/kotlin/2022/10/compose...

# compose-desktop

[Vlad Ostaci]

https://blog.jetbrains.com/kotlin/2022/10/compose-multiplatform-1-2-is-out/#New_onClick_modifier
How do I get the position of the Right click?

Box(
  modifier = Modifier.onClick(
    matcher = PointerMatcher.mouse(PointerButton.Secondary), // Right Mouse Button
    onClick = {
      println("Right Click")
    }
  )
) {
  Text(text = "Right click on me", modifier = Modifier.align(Alignment.Center))
}

[Oleksandr Karpovich [JB]]

onClick doesn’t provide the position.
The mouse position can be retrieved by using Modifier.pointeInput. Here is an example:

val point = remember { mutableStateOf<Point?>(null) }

Box(modifier = Modifier
    .size(100.dp)
    .background(Color.Yellow)
    .onClick { println("Clicked at point = ${point.value}") }
    .pointerInput(Unit) {
        while (currentCoroutineContext().isActive) {
            awaitPointerEventScope {
                point.value = awaitPointerEvent().awtEventOrNull?.point
            }
        }
    }
)

So the code above will track the mouse position within the Box, and then when click occurs we can use the saved position.
But it’s worth to mention that it “knows” only the last position, so if you press down the mouse button at 5,5 and then move it to 20,20 and release the button, then in onClick it will print [x=20,y=20]
if you need to know the first position (the position of the press event), then the code above needs to be adjusted, but pointerInput should still help

[Vlad Ostaci]

Thank you @Oleksandr Karpovich [JB]
I also found out this other way:

Modifier.onPointerEvent(PointerEventType.Press) { event ->
  if (event.buttons.isSecondaryPressed) {
    val clickPosition = event.changes.firstOrNull()?.position
    println("Right click: $clickPosition")
  }
  event.changes.forEach { e -> e.consume() }
}

[Kirill Grouchnikov]

Are PointerButton.Secondary and PointerEvent.buttons.isSecondaryPressed properly mapped to the platform-specific popup-trigger logic?

For example, on macOS you should display popup on Ctrl+Left Mouse click. With Swing / AWT, that is handled in here that has special handling for it (no native code, at least not yet) and exposed in a platform-consistent fashion in MouseEvent.isPopupTrigger.

Unless you’re willing to replicate that platform-specific logic, I would suggest either filing a feature request to add isPopupTrigger to Compose’s PointerEvent, or revisit your assumption that right click is identical to popup trigger.

[Oleksandr Karpovich [JB]]

Are PointerButton.Secondary and PointerEvent.buttons.isSecondaryPressed properly mapped to the platform-specific popup-trigger logic?

No, those are not mapped to platform-specific popup-trigger logic. Those are merely representations of pointer buttons indexes.

[Kirill Grouchnikov]

Then the handling of what is and is not a popup trigger will not be consistent with other (native, electron, web) apps across the various platforms with the proposed snippets

[Oleksandr Karpovich [JB]]

that’s true. As I see the question was rather about right click than about popup trigger.

[Kirill Grouchnikov]

Correct, but the two things are not identical. If the “right click” is the substitute for when popup menu should be shown, then it’s not the right substitute.

[Vlad Ostaci]

Do I have to write that logic at the moment to handle for each platform. My goal is to show a popup when the user Right clicks on Windows and whatever other variations might be for other platforms

[Kirill Grouchnikov]

For desktop-only variants where you can drop to the underlying AWT events, you can go along the lines of what I do in Aurora.

[Oleksandr Karpovich [JB]]

yes, as for now, I think awtEventOrNull should give the access to all the necessary details

[Vlad Ostaci]

Thank you Kirill, will have a look

[Vlad Ostaci]

I'm testing it on Windows but isPopupTrigger is always false.

Modifier.pointerInput(Unit) {
  while (true) {
    val lastMouseEvent = awaitPointerEventScope { awaitPointerEvent() }
    val awtEventOrNull = lastMouseEvent.awtEventOrNull

    if (awtEventOrNull?.isPopupTrigger == true) {
      println("Show popup")
    }
  }
}

[Vlad Ostaci]

It actually works on Windows as well. I didn't test it properly.