Modal Sheet

Modal Sheet library for Jetpack Compose.

Motivation

Sometimes we want bottom sheets to behave as real modals, thus overlaying all content on the screen. Official ModalBottomSheetState however, is laid out only in bounds of the parent Composable. This means that to display a bottom sheet above, for example bottom bar navigation, it must be placed "higher" in the hierarchy than usage in one of the tab screen.

The ModalSheet Composable from this library allows creating real modal bottom sheets which could be placed anywhere in the hierarchy.

Solution

The ModalSheet Composable internally uses FullScreenPopup which is basically a window placed above the current window and allows placing Composables inside. Then ModalSheet adds swipe-to-dismiss, scrim and shaping to simulate bottom sheet behavior.

The FullScreenPopup is public, thus can be used to create own "modal" Composables.

Usage

Get a dependency

Step 1. Add the MavenCentral repository to your build file. Add it in your root build.gradle at the end of repositories:

allprojects {
    repositories {
        ...
        mavenCentral()
    }
}

Or in settings.gradle:

dependencyResolutionManagement {
    repositories {
        ...
        mavenCentral()
    }
}

Step 2. Add the dependency. Check latest version on the releases page.

dependencies {
    implementation 'io.github.oleksandrbalan:modalsheet:$version'
}

Use in Composable

The ModalSheet has 2 mandatory arguments:

• visible - True if modal should be visible.
• onVisibleChange - Called when visibility changes.

var visible by remember { mutableStateOf(false) }

Button(onClick = { visible = true }) {
    Text(text = "Show modal sheet")
}

ModalSheet(
    visible = visible,
    onVisibleChange = { visible = it },
) {
    Box(Modifier.height(200.dp))
}

See Demo application and examples for more usage examples.

Alternative overloads

Library also has a ModalSheet overload which receives data to be shown in the bottom sheet. When data is not null, bottom sheet is shown; when null, bottom sheet is hidden.

This is useful when bottom sheet content dependents on some state, which may be change with a time, for example the bottom sheet which shows an error message. See DynamicModalSheetScreen.

Also there is an option to use ModalSheet overload with ModalBottomSheetState to have a full control when sheet should be shown or hidden. See SheetStateModalSheetScreen.

Authors

• Filip Wiesner Initial modal sheet idea and implementation.

• Oleksandr Balan Popup enhancements and support.

TODO list

• Provide swipe state to ModalSheetScope