| /* |
| * Copyright 2022 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. |
| */ |
| |
| @file:OptIn(ExperimentalComposeUiApi::class) |
| package androidx.compose.ui.node |
| |
| import androidx.compose.foundation.layout.Box |
| import androidx.compose.foundation.layout.size |
| import androidx.compose.ui.ExperimentalComposeUiApi |
| import androidx.compose.ui.Modifier |
| import androidx.compose.ui.graphics.graphicsLayer |
| import androidx.compose.ui.layout.Layout |
| import androidx.compose.ui.layout.Measurable |
| import androidx.compose.ui.layout.MeasurePolicy |
| import androidx.compose.ui.layout.MeasureResult |
| import androidx.compose.ui.layout.MeasureScope |
| import androidx.compose.ui.platform.testTag |
| import androidx.compose.ui.semantics.semantics |
| import androidx.compose.ui.test.junit4.createComposeRule |
| import androidx.compose.ui.test.onNodeWithTag |
| import androidx.compose.ui.unit.Constraints |
| import androidx.compose.ui.unit.dp |
| import com.google.common.truth.Truth.assertThat |
| import org.junit.Rule |
| import org.junit.Test |
| |
| class NodeChainOwnerTests { |
| |
| @get:Rule |
| val rule = createComposeRule() |
| |
| @Test |
| fun getModifierNode_returnsLayers_whenGraphicsLayerIsTail() { |
| rule.setContent { |
| // box gets the root graphics layer applied to it |
| Box { |
| // test this, with no graphicsLayers added externally |
| Layout( |
| modifier = Modifier.testTag("tag").graphicsLayer(), |
| EmptyMeasurePolicy()) |
| } |
| } |
| |
| val modifierInfo = rule.onNodeWithTag("tag") |
| .fetchSemanticsNode() |
| .layoutInfo |
| .getModifierInfo() |
| assertThat(modifierInfo.mapNotNull { it.extra }).hasSize(1) |
| } |
| |
| @Test |
| fun getModifierNode_returnsLayersWhenHead_noOtherLayout() { |
| rule.setContent { |
| // box gets the root graphics layer applied to it |
| Box { |
| // test this, with no graphicsLayers added externally |
| Layout( |
| modifier = Modifier.graphicsLayer().semantics {}.testTag("tag"), |
| EmptyMeasurePolicy()) |
| } |
| } |
| |
| val modifierInfo = rule.onNodeWithTag("tag") |
| .fetchSemanticsNode() |
| .layoutInfo |
| .getModifierInfo() |
| assertThat(modifierInfo.mapNotNull { it.extra }).hasSize(2) |
| } |
| |
| @Test |
| fun getModifierNode_returnsLayersWhenHead_whenTailLayoutLayout() { |
| rule.setContent { |
| // box gets the root graphics layer applied to it |
| Box { |
| // test this, with no graphicsLayers added externally |
| Layout( |
| modifier = Modifier.graphicsLayer().size(30.dp).testTag("tag"), |
| EmptyMeasurePolicy()) |
| } |
| } |
| |
| val modifierInfo = rule.onNodeWithTag("tag") |
| .fetchSemanticsNode() |
| .layoutInfo |
| .getModifierInfo() |
| assertThat(modifierInfo.mapNotNull { it.extra }).hasSize(1) |
| } |
| } |
| |
| class EmptyMeasurePolicy : MeasurePolicy { |
| override fun MeasureScope.measure( |
| measurables: List<Measurable>, |
| constraints: Constraints |
| ): MeasureResult { |
| return layout(constraints.maxWidth, constraints.maxHeight, placementBlock = {}) |
| } |
| } |
