| /* |
| * 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.compose.foundation.layout |
| |
| import androidx.compose.Composable |
| import androidx.compose.emptyContent |
| import androidx.test.filters.SmallTest |
| import androidx.ui.core.ConfigurationAmbient |
| import androidx.ui.core.Layout |
| import androidx.ui.core.LayoutDirection |
| import androidx.ui.core.Modifier |
| import androidx.ui.core.Ref |
| import androidx.ui.core.localeLayoutDirection |
| import org.junit.Assert.assertEquals |
| import org.junit.Assert.assertNotNull |
| import org.junit.Assert.assertTrue |
| import org.junit.Test |
| import org.junit.runner.RunWith |
| import org.junit.runners.JUnit4 |
| import java.util.concurrent.CountDownLatch |
| import java.util.concurrent.TimeUnit |
| |
| @SmallTest |
| @RunWith(JUnit4::class) |
| class LayoutDirectionModifierTest : LayoutTest() { |
| |
| @Test |
| fun testModifiedLayoutDirection_inMeasureScope() { |
| val latch = CountDownLatch(1) |
| val resultLayoutDirection = Ref<LayoutDirection>() |
| |
| show { |
| Layout( |
| children = @Composable {}, |
| modifier = Modifier.rtl |
| ) { _, _ -> |
| resultLayoutDirection.value = layoutDirection |
| latch.countDown() |
| layout(0, 0) {} |
| } |
| } |
| |
| assertTrue(latch.await(1, TimeUnit.SECONDS)) |
| assertTrue(LayoutDirection.Rtl == resultLayoutDirection.value) |
| } |
| |
| @Test |
| fun testModifiedLayoutDirection_inIntrinsicsMeasure() { |
| val latch = CountDownLatch(1) |
| var resultLayoutDirection: LayoutDirection? = null |
| |
| show { |
| @OptIn(ExperimentalLayout::class) |
| Layout( |
| children = @Composable {}, |
| modifier = Modifier.preferredWidth(IntrinsicSize.Max).rtl, |
| minIntrinsicWidthMeasureBlock = { _, _ -> 0 }, |
| minIntrinsicHeightMeasureBlock = { _, _ -> 0 }, |
| maxIntrinsicWidthMeasureBlock = { _, _ -> |
| resultLayoutDirection = this.layoutDirection |
| latch.countDown() |
| 0 |
| }, |
| maxIntrinsicHeightMeasureBlock = { _, _ -> 0 } |
| ) { _, _ -> |
| layout(0, 0) {} |
| } |
| } |
| |
| assertTrue(latch.await(1, TimeUnit.SECONDS)) |
| assertNotNull(resultLayoutDirection) |
| assertTrue(LayoutDirection.Rtl == resultLayoutDirection) |
| } |
| |
| @Test |
| fun testRestoreLocaleLayoutDirection() { |
| val latch = CountDownLatch(1) |
| val resultLayoutDirection = Ref<LayoutDirection>() |
| |
| show { |
| Stack(Modifier.rtl) { |
| val restoreModifier = when (ConfigurationAmbient.current.localeLayoutDirection) { |
| LayoutDirection.Ltr -> Modifier.ltr |
| LayoutDirection.Rtl -> Modifier.rtl |
| } |
| Layout(emptyContent(), restoreModifier) { _, _ -> |
| resultLayoutDirection.value = layoutDirection |
| latch.countDown() |
| layout(0, 0) {} |
| } |
| } |
| } |
| |
| assertTrue(latch.await(1, TimeUnit.SECONDS)) |
| assertEquals(LayoutDirection.Ltr, resultLayoutDirection.value) |
| } |
| } |