| /* |
| * Copyright 2020 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.integration.test.foundation |
| |
| import androidx.compose.Composable |
| import androidx.ui.core.Modifier |
| import androidx.ui.foundation.Canvas |
| import androidx.ui.foundation.ScrollerPosition |
| import androidx.ui.foundation.VerticalScroller |
| import androidx.ui.graphics.Color |
| import androidx.ui.integration.test.ToggleableTestCase |
| import androidx.ui.layout.Column |
| import androidx.ui.layout.fillMaxHeight |
| import androidx.ui.layout.preferredSize |
| import androidx.ui.test.ComposeTestCase |
| import androidx.ui.unit.dp |
| |
| /** |
| * Test case that puts a large number of boxes in a column in a vertical scroller to force scrolling. |
| */ |
| class ScrollerTestCase() : ComposeTestCase, ToggleableTestCase { |
| private lateinit var scrollerPosition: ScrollerPosition |
| |
| @Composable |
| override fun emitContent() { |
| scrollerPosition = ScrollerPosition() |
| VerticalScroller( |
| scrollerPosition = scrollerPosition |
| ) { |
| Column(Modifier.fillMaxHeight()) { |
| for (green in 0..0xFF) { |
| ColorStripe(0xFF, green, 0) |
| } |
| for (red in 0xFF downTo 0) { |
| ColorStripe(red, 0xFF, 0) |
| } |
| for (blue in 0..0xFF) { |
| ColorStripe(0, 0xFF, blue) |
| } |
| for (green in 0xFF downTo 0) { |
| ColorStripe(0, green, 0xFF) |
| } |
| for (red in 0..0xFF) { |
| ColorStripe(red, 0, 0xFF) |
| } |
| for (blue in 0xFF downTo 0) { |
| ColorStripe(0xFF, 0, blue) |
| } |
| } |
| } |
| } |
| |
| override fun toggleState() { |
| scrollerPosition.scrollTo(if (scrollerPosition.value == 0f) 10f else 0f) |
| } |
| |
| @Composable |
| fun ColorStripe(red: Int, green: Int, blue: Int) { |
| Canvas(Modifier.preferredSize(45.dp, 5.dp)) { |
| drawRect(Color(red = red, green = green, blue = blue)) |
| } |
| } |
| } |