| /* |
| * Copyright 2020 The Android Open Source Project |
| * |
| * Licensed under the Apache License, Version 2.0 (the "License"); |
| * you may not use this file except in compliance with the License. |
| * You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| |
| package androidx.compose.foundation.samples |
| |
| import androidx.annotation.Sampled |
| import androidx.compose.Composable |
| import androidx.compose.state |
| import androidx.ui.core.Modifier |
| import androidx.ui.core.gesture.scrollorientationlocking.Orientation |
| import androidx.compose.foundation.Box |
| import androidx.compose.foundation.ContentGravity |
| import androidx.compose.foundation.Text |
| import androidx.compose.foundation.gestures.rememberScrollableController |
| import androidx.compose.foundation.gestures.scrollable |
| import androidx.ui.graphics.Color |
| import androidx.compose.foundation.layout.preferredSize |
| import androidx.ui.text.TextStyle |
| import androidx.ui.unit.dp |
| import androidx.ui.unit.sp |
| import kotlin.math.roundToInt |
| |
| @Sampled |
| @Composable |
| fun ScrollableSample() { |
| // actual composable state |
| val offset = state { 0f } |
| // state for Scrollable, describes how to consume scrolling delta and update offset |
| Box( |
| Modifier |
| .preferredSize(200.dp) |
| .scrollable( |
| orientation = Orientation.Vertical, |
| controller = rememberScrollableController { delta -> |
| offset.value = offset.value + delta |
| delta |
| } |
| ), |
| backgroundColor = Color.LightGray, |
| gravity = ContentGravity.Center |
| ) { |
| Text(offset.value.roundToInt().toString(), style = TextStyle(fontSize = 50.sp)) |
| } |
| } |