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I have a complex dialog with multiple scrollable sections. The left panel should remain non-scrollable until the right panel is fully scrolled to the bottom. Once the right panel reaches the bottom, both panels should scroll together, and the bottom content should then appear. How can I implement this behavior?

Here is code example:

@Composable
fun DialogScreen(
    // params
) {
    // ...
    val subscriptionCardsScrollState = rememberScrollState()

    Box {

        Column(
            modifier = Modifier
                .verticalScroll(state = subscriptionCardsScrollState),
        ) {
            Row {
                RightPanel(
                    modifier = Modifier
                        .scrollable(
                            enabled = false,
                            state = subscriptionCardsScrollState,
                            orientation = Orientation.Vertical,
                        ),
                )

                LeftPanel(
                    modifier = Modifier,
                )
            }

            // bottom content
        }
    }
}

Here is a picture that illustrates an example of how the screen looks:

I have a complex dialog with multiple scrollable sections. The left panel should remain non-scrollable until the right panel is fully scrolled to the bottom. Once the right panel reaches the bottom, both panels should scroll together, and the bottom content should then appear. How can I implement this behavior?

Here is code example:

@Composable
fun DialogScreen(
    // params
) {
    // ...
    val subscriptionCardsScrollState = rememberScrollState()

    Box {

        Column(
            modifier = Modifier
                .verticalScroll(state = subscriptionCardsScrollState),
        ) {
            Row {
                RightPanel(
                    modifier = Modifier
                        .scrollable(
                            enabled = false,
                            state = subscriptionCardsScrollState,
                            orientation = Orientation.Vertical,
                        ),
                )

                LeftPanel(
                    modifier = Modifier,
                )
            }

            // bottom content
        }
    }
}

Here is a picture that illustrates an example of how the screen looks:

Share Improve this question asked Nov 18, 2024 at 10:21 Denis PopkovDenis Popkov 554 bronze badges
Add a comment  | 

1 Answer 1

Reset to default 1

You can make use of the canScrollForward boolean of the ScrolLState. Please try the following code:

@Composable
fun DialogScreen(
) {
    val subscriptionCardsScrollState = rememberScrollState()

    Box {

        Column(
            modifier = Modifier
                .verticalScroll(
                    enabled = !subscriptionCardsScrollState.canScrollForward,
                    state = rememberScrollState()
                ),
        ) {
            Row {
                Column(
                    modifier = Modifier,
                ) {
                    repeat(25) {
                        Text("LEFT ITEM $it")
                    }
                }
                Column(
                    modifier = Modifier
                        .height(250.dp)
                        .verticalScroll(
                            enabled = subscriptionCardsScrollState.canScrollForward,
                            state = subscriptionCardsScrollState
                        ),
                ) {
                    repeat(45) {
                        Text("RIGHT ITEM $it")
                    }
                }
            }

            if (!subscriptionCardsScrollState.canScrollForward) {
                Text("BOTTOM CONTENT")
            }
        }
    }
}

Note that you can't have two vertically scrolling Composables nested while both are using fillMaxHeight. You need to set a fixed height on the inner scrollable Composable.

I have a complex dialog with multiple scrollable sections. The left panel should remain non-scrollable until the right panel is fully scrolled to the bottom. Once the right panel reaches the bottom, both panels should scroll together, and the bottom content should then appear. How can I implement this behavior?

Here is code example:

@Composable
fun DialogScreen(
    // params
) {
    // ...
    val subscriptionCardsScrollState = rememberScrollState()

    Box {

        Column(
            modifier = Modifier
                .verticalScroll(state = subscriptionCardsScrollState),
        ) {
            Row {
                RightPanel(
                    modifier = Modifier
                        .scrollable(
                            enabled = false,
                            state = subscriptionCardsScrollState,
                            orientation = Orientation.Vertical,
                        ),
                )

                LeftPanel(
                    modifier = Modifier,
                )
            }

            // bottom content
        }
    }
}

Here is a picture that illustrates an example of how the screen looks:

I have a complex dialog with multiple scrollable sections. The left panel should remain non-scrollable until the right panel is fully scrolled to the bottom. Once the right panel reaches the bottom, both panels should scroll together, and the bottom content should then appear. How can I implement this behavior?

Here is code example:

@Composable
fun DialogScreen(
    // params
) {
    // ...
    val subscriptionCardsScrollState = rememberScrollState()

    Box {

        Column(
            modifier = Modifier
                .verticalScroll(state = subscriptionCardsScrollState),
        ) {
            Row {
                RightPanel(
                    modifier = Modifier
                        .scrollable(
                            enabled = false,
                            state = subscriptionCardsScrollState,
                            orientation = Orientation.Vertical,
                        ),
                )

                LeftPanel(
                    modifier = Modifier,
                )
            }

            // bottom content
        }
    }
}

Here is a picture that illustrates an example of how the screen looks:

Share Improve this question asked Nov 18, 2024 at 10:21 Denis PopkovDenis Popkov 554 bronze badges
Add a comment  | 

1 Answer 1

Reset to default 1

You can make use of the canScrollForward boolean of the ScrolLState. Please try the following code:

@Composable
fun DialogScreen(
) {
    val subscriptionCardsScrollState = rememberScrollState()

    Box {

        Column(
            modifier = Modifier
                .verticalScroll(
                    enabled = !subscriptionCardsScrollState.canScrollForward,
                    state = rememberScrollState()
                ),
        ) {
            Row {
                Column(
                    modifier = Modifier,
                ) {
                    repeat(25) {
                        Text("LEFT ITEM $it")
                    }
                }
                Column(
                    modifier = Modifier
                        .height(250.dp)
                        .verticalScroll(
                            enabled = subscriptionCardsScrollState.canScrollForward,
                            state = subscriptionCardsScrollState
                        ),
                ) {
                    repeat(45) {
                        Text("RIGHT ITEM $it")
                    }
                }
            }

            if (!subscriptionCardsScrollState.canScrollForward) {
                Text("BOTTOM CONTENT")
            }
        }
    }
}

Note that you can't have two vertically scrolling Composables nested while both are using fillMaxHeight. You need to set a fixed height on the inner scrollable Composable.

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