| /* |
| * Copyright 2019 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.gestures.draggable |
| import androidx.compose.ui.graphics.Color |
| import androidx.compose.foundation.layout.offsetPx |
| import androidx.compose.foundation.layout.preferredSize |
| import androidx.compose.foundation.layout.preferredWidth |
| import androidx.compose.ui.unit.dp |
| |
| @Sampled |
| @Composable |
| fun DraggableSample() { |
| // Draw a seekbar-like composable that has a black background |
| // with a red square that moves along the 300.dp drag distance |
| val max = 300.dp |
| val min = 0.dp |
| // this is the state we will update while dragging |
| val offsetPosition = state { 0f } |
| |
| // seekbar itself |
| Box( |
| modifier = Modifier |
| .preferredWidth(max) |
| .draggable(orientation = Orientation.Horizontal) { delta -> |
| val newValue = offsetPosition.value + delta |
| offsetPosition.value = newValue.coerceIn(min.toPx(), max.toPx()) |
| }, |
| backgroundColor = Color.Black |
| ) { |
| Box( |
| Modifier.offsetPx(x = offsetPosition).preferredSize(50.dp), |
| backgroundColor = Color.Red |
| ) |
| } |
| } |