| /* |
| * 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.FloatPropKey |
| import androidx.compose.animation.core.LinearEasing |
| import androidx.compose.animation.core.repeatable |
| import androidx.compose.animation.core.transitionDefinition |
| import androidx.compose.animation.core.tween |
| import androidx.compose.Composable |
| import androidx.compose.state |
| import androidx.compose.animation.transition |
| import androidx.ui.core.Alignment |
| import androidx.ui.core.Modifier |
| import androidx.ui.core.gesture.tapGestureFilter |
| import androidx.compose.foundation.Canvas |
| import androidx.compose.foundation.Text |
| import androidx.compose.ui.graphics.Color |
| import androidx.compose.ui.graphics.drawscope.rotate |
| import androidx.compose.foundation.layout.Arrangement |
| import androidx.compose.foundation.layout.Column |
| import androidx.compose.foundation.layout.fillMaxSize |
| import androidx.compose.foundation.layout.preferredSize |
| import androidx.compose.foundation.layout.wrapContentSize |
| import androidx.compose.ui.text.TextStyle |
| import androidx.ui.unit.dp |
| import androidx.ui.unit.sp |
| |
| @Composable |
| fun RepeatedRotationDemo() { |
| val state = state { RotationStates.Original } |
| Column( |
| Modifier.fillMaxSize() |
| .wrapContentSize(Alignment.Center), |
| verticalArrangement = Arrangement.SpaceEvenly |
| ) { |
| val textStyle = TextStyle(fontSize = 18.sp) |
| Text( |
| modifier = Modifier.tapGestureFilter(onTap = { state.value = RotationStates.Rotated }), |
| text = "Rotate 10 times", |
| style = textStyle |
| ) |
| Text( |
| modifier = Modifier.tapGestureFilter(onTap = { state.value = RotationStates.Original }), |
| text = "Reset", |
| style = textStyle |
| ) |
| val transitionState = transition( |
| definition = definition, |
| toState = state.value |
| ) |
| Canvas(Modifier.preferredSize(100.dp)) { |
| rotate(transitionState[rotation], 0.0f, 0.0f) { |
| drawRect(Color(0xFF00FF00)) |
| } |
| } |
| } |
| } |
| |
| private enum class RotationStates { |
| Original, |
| Rotated |
| } |
| |
| private val rotation = FloatPropKey() |
| |
| private val definition = transitionDefinition { |
| state(RotationStates.Original) { |
| this[rotation] = 0f |
| } |
| state(RotationStates.Rotated) { |
| this[rotation] = 360f |
| } |
| transition(RotationStates.Original to RotationStates.Rotated) { |
| rotation using repeatable( |
| iterations = 10, |
| animation = tween( |
| easing = LinearEasing, |
| durationMillis = 1000 |
| ) |
| ) |
| } |
| transition(RotationStates.Rotated to RotationStates.Original) { |
| rotation using tween( |
| durationMillis = 300 |
| ) |
| } |
| } |