| /* |
| * 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.ui.material.demos |
| |
| import android.os.Handler |
| import android.os.Looper |
| import androidx.compose.Composable |
| import androidx.compose.Stable |
| import androidx.compose.getValue |
| import androidx.compose.mutableStateOf |
| import androidx.compose.onActive |
| import androidx.compose.onDispose |
| import androidx.compose.remember |
| import androidx.compose.setValue |
| import androidx.ui.core.Alignment |
| import androidx.ui.core.Modifier |
| import androidx.compose.foundation.ScrollableColumn |
| import androidx.compose.ui.graphics.Color |
| import androidx.compose.foundation.layout.Arrangement |
| import androidx.compose.foundation.layout.Row |
| import androidx.compose.foundation.layout.fillMaxWidth |
| import androidx.ui.material.CircularProgressIndicator |
| import androidx.ui.material.LinearProgressIndicator |
| |
| @Composable |
| fun ProgressIndicatorDemo() { |
| val state = remember { ProgressState() } |
| |
| onActive { state.start() } |
| onDispose { state.stop() } |
| |
| ScrollableColumn { |
| val modifier = Modifier.weight(1f, true) |
| .gravity(Alignment.CenterHorizontally) |
| .fillMaxWidth() |
| Row(modifier, horizontalArrangement = Arrangement.SpaceEvenly) { |
| // Determinate indicators |
| LinearProgressIndicator(state.progress, Modifier.gravity(Alignment.CenterVertically)) |
| CircularProgressIndicator(state.progress, Modifier.gravity(Alignment.CenterVertically)) |
| } |
| Row(modifier, horizontalArrangement = Arrangement.SpaceEvenly) { |
| // Fancy colours! |
| LinearProgressIndicator( |
| progress = (state.progress), |
| color = state.color, |
| modifier = Modifier.gravity(Alignment.CenterVertically) |
| ) |
| CircularProgressIndicator( |
| progress = (state.progress), |
| color = state.color, |
| modifier = Modifier.gravity(Alignment.CenterVertically) |
| ) |
| } |
| Row(modifier, horizontalArrangement = Arrangement.SpaceEvenly) { |
| // Indeterminate indicators |
| LinearProgressIndicator(Modifier.gravity(Alignment.CenterVertically)) |
| CircularProgressIndicator(Modifier.gravity(Alignment.CenterVertically)) |
| } |
| } |
| } |
| |
| @Stable |
| private class ProgressState { |
| var progress by mutableStateOf(0f) |
| var color by mutableStateOf(Color.Red) |
| |
| fun start() { |
| handler.postDelayed(updateProgress, 400) |
| } |
| |
| fun stop() { |
| handler.removeCallbacks(updateProgress) |
| } |
| |
| val handler = Handler(Looper.getMainLooper()) |
| val updateProgress: Runnable = object : Runnable { |
| override fun run() { |
| if (progress == 1f) { |
| color = when (color) { |
| Color.Red -> Color.Green |
| Color.Green -> Color.Blue |
| else -> Color.Red |
| } |
| progress = 0f |
| } else { |
| progress += 0.25f |
| } |
| handler.postDelayed(this, 400) |
| } |
| } |
| } |