---
title: "Transition: curtain"
description: Two halves part from the middle to reveal content, and close to hide it.
---

Curtain opens content like a stage curtain: two halves slide apart from the middle, and slide back to close. Use it for a reveal, such as a prize, a result or a new feature.

## Usage

The sample opens a prize card left and right, and closes it the same way.

```kotlin
import androidx.compose.foundation.background
import androidx.compose.foundation.layout.Box
import androidx.compose.foundation.layout.size
import androidx.compose.runtime.Composable
import androidx.compose.ui.Modifier
import androidx.compose.ui.graphics.Color
import androidx.compose.ui.unit.dp
import com.jantursky.kapow.BlindsOrientation
import com.jantursky.kapow.KapowAnimatedVisibility
import com.jantursky.kapow.KapowEnter
import com.jantursky.kapow.KapowExit

@Composable
fun Prize(visible: Boolean) {
    KapowAnimatedVisibility(
        visible = visible,
        enter = KapowEnter.curtain(orientation = BlindsOrientation.Vertical),
        exit = KapowExit.curtain(orientation = BlindsOrientation.Vertical),
    ) {
        Box(Modifier.size(240.dp, 160.dp).background(Color.DarkGray))
    }
}
```

## Parameters

| Parameter | Default | Description |
| --- | --- | --- |
| `orientation` | `BlindsOrientation.Vertical` | The direction of the seam, as in `blinds`. `Vertical` parts the halves left and right, `Horizontal` up and down. |
| `duration` | `450.milliseconds` | How long the transition takes. Must be positive. |
| `split` | `0.5f` | Where the seam sits, as a share of the content's width (or height) from 0 to 1. Each half moves just far enough to clear its own side. |

Every transition also has `.delay(...)`, `.easing(...)` and `.reducedMotion(...)`. See [Stagger](/effects/transition-stagger).

## Reduced motion

The transition becomes a fade over the same duration or shorter. There is no mask.

## Notes

- Available as `KapowEnter.curtain()` and `KapowExit.curtain()`. The exit closes the halves from the sides to the middle.
- The halves are a mask, not drawn cloth: what shows between them is the content, and what they cover is transparent. Their edges carry soft folds a few dp deep.
- The mask is drawn with an offscreen layer and a blend mode, so it works on all targets, including Android API 23.

## Live example

<iframe class="live-example" src="https://kapow-demo.vercel.app/#transition-curtain" title="Live example: transition-curtain" loading="lazy" allow="autoplay"></iframe>