| /* |
| * 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.animation.demos |
| |
| import androidx.compose.animation.core.LinearEasing |
| import androidx.compose.animation.core.animateFloat |
| import androidx.compose.animation.core.keyframes |
| import androidx.compose.animation.core.repeatable |
| import androidx.compose.animation.core.updateTransition |
| import androidx.compose.animation.core.tween |
| import androidx.compose.foundation.Canvas |
| import androidx.compose.foundation.layout.Arrangement |
| import androidx.compose.foundation.layout.Column |
| import androidx.compose.foundation.layout.Spacer |
| import androidx.compose.foundation.layout.fillMaxSize |
| import androidx.compose.foundation.layout.height |
| import androidx.compose.foundation.layout.preferredSize |
| import androidx.compose.foundation.layout.wrapContentSize |
| import androidx.compose.material.Button |
| import androidx.compose.material.Text |
| import androidx.compose.runtime.Composable |
| import androidx.compose.runtime.getValue |
| import androidx.compose.runtime.mutableStateOf |
| import androidx.compose.runtime.remember |
| import androidx.compose.ui.Alignment |
| import androidx.compose.ui.Modifier |
| import androidx.compose.ui.geometry.Offset |
| import androidx.compose.ui.graphics.Color |
| import androidx.compose.ui.graphics.drawscope.rotate |
| import androidx.compose.ui.unit.dp |
| |
| @Composable |
| fun RepeatedRotationDemo() { |
| val state = remember { mutableStateOf(RotationStates.Original) } |
| Column( |
| Modifier.fillMaxSize() |
| .wrapContentSize(Alignment.Center), |
| verticalArrangement = Arrangement.SpaceEvenly |
| ) { |
| Button( |
| { state.value = RotationStates.Rotated } |
| ) { |
| Text(text = "Rotate 10 times") |
| } |
| Spacer(Modifier.height(10.dp)) |
| Button( |
| { state.value = RotationStates.Original } |
| ) { |
| Text(text = "Reset") |
| } |
| Spacer(Modifier.height(10.dp)) |
| val transition = updateTransition(state.value) |
| val rotation by transition.animateFloat( |
| transitionSpec = { |
| if (initialState == RotationStates.Original) { |
| repeatable( |
| iterations = 10, |
| animation = keyframes { |
| durationMillis = 1000 |
| 0f at 0 with LinearEasing |
| 360f at 1000 |
| } |
| ) |
| } else { |
| tween(durationMillis = 300) |
| } |
| } |
| ) { |
| 0f |
| } |
| Canvas(Modifier.preferredSize(100.dp)) { |
| rotate(rotation, Offset.Zero) { |
| drawRect(Color(0xFF00FF00)) |
| } |
| } |
| } |
| } |
| |
| private enum class RotationStates { |
| Original, |
| Rotated |
| } |