| /* |
| * 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 androidx.compose.Composable |
| import androidx.compose.Model |
| import androidx.compose.onActive |
| import androidx.compose.onDispose |
| import androidx.compose.unaryPlus |
| import androidx.ui.graphics.Color |
| import androidx.ui.layout.Arrangement |
| import androidx.ui.layout.LayoutExpandedWidth |
| import androidx.ui.layout.FlexColumn |
| import androidx.ui.layout.MainAxisAlignment |
| import androidx.ui.layout.Row |
| import androidx.ui.material.CircularProgressIndicator |
| import androidx.ui.material.LinearProgressIndicator |
| |
| class ProgressIndicatorActivity : MaterialDemoActivity() { |
| |
| @Composable |
| override fun materialContent() { |
| ProgressIndicatorDemo() |
| } |
| } |
| |
| @Model |
| private class ProgressState { |
| var progress = 0f |
| var cycle = 1 |
| |
| fun generateColor(): Color { |
| return when (cycle) { |
| 1 -> Color.Red |
| 2 -> Color.Green |
| 3 -> Color.Blue |
| // unused |
| else -> Color.Black |
| } |
| } |
| |
| fun start() { |
| handler.postDelayed(updateProgress, 400) |
| } |
| |
| fun stop() { |
| handler.removeCallbacks(updateProgress) |
| } |
| |
| val handler = Handler() |
| val updateProgress: Runnable = object : Runnable { |
| override fun run() { |
| if (progress == 1f) { |
| cycle++ |
| if (cycle > 3) { |
| cycle = 1 |
| } |
| progress = 0f |
| } else { |
| progress += 0.25f |
| } |
| handler.postDelayed(this, 400) |
| } |
| } |
| } |
| |
| @Composable |
| private fun ProgressIndicatorDemo(state: ProgressState = ProgressState()) { |
| |
| +onActive { state.start() } |
| +onDispose { state.stop() } |
| |
| FlexColumn(mainAxisAlignment = MainAxisAlignment.Center) { |
| expanded(flex = 1f) { |
| Row(LayoutExpandedWidth, arrangement = Arrangement.SpaceEvenly) { |
| // Determinate indicators |
| LinearProgressIndicator(progress = state.progress) |
| CircularProgressIndicator(progress = state.progress) |
| } |
| Row(LayoutExpandedWidth, arrangement = Arrangement.SpaceEvenly) { |
| // Fancy colours! |
| LinearProgressIndicator(progress = (state.progress), color = state.generateColor()) |
| CircularProgressIndicator( |
| progress = (state.progress), |
| color = state.generateColor() |
| ) |
| } |
| Row(LayoutExpandedWidth, arrangement = Arrangement.SpaceEvenly) { |
| // Indeterminate indicators |
| LinearProgressIndicator() |
| CircularProgressIndicator() |
| } |
| } |
| } |
| } |