Animate content size
RelNote: "New animateContentSize modifier that animates the
layout size change of its child modifier"
BUG: 161505091
Test: Unit test added
Change-Id: Ieffdccd0fd0545ed139ecc20ef7baaebcda6d9d2
diff --git a/ui/ui-animation/src/androidAndroidTest/kotlin/androidx/ui/animation/AnimationModifierTest.kt b/ui/ui-animation/src/androidAndroidTest/kotlin/androidx/ui/animation/AnimationModifierTest.kt
new file mode 100644
index 0000000..ecdc601
--- /dev/null
+++ b/ui/ui-animation/src/androidAndroidTest/kotlin/androidx/ui/animation/AnimationModifierTest.kt
@@ -0,0 +1,116 @@
+/*
+ * 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.animation
+
+import androidx.animation.LinearOutSlowInEasing
+import androidx.animation.tween
+import androidx.compose.foundation.Box
+import androidx.compose.foundation.layout.size
+import androidx.compose.getValue
+import androidx.compose.mutableStateOf
+import androidx.compose.setValue
+import androidx.test.filters.MediumTest
+import androidx.ui.core.Constraints
+import androidx.ui.core.DensityAmbient
+import androidx.ui.core.LayoutDirection
+import androidx.ui.core.LayoutModifier
+import androidx.ui.core.Measurable
+import androidx.ui.core.MeasureScope
+import androidx.ui.core.Modifier
+import androidx.ui.test.createComposeRule
+import androidx.ui.test.runOnIdle
+import androidx.ui.test.waitForIdle
+import androidx.ui.unit.dp
+import junit.framework.TestCase.assertEquals
+import org.junit.Rule
+import org.junit.Test
+import org.junit.runner.RunWith
+import org.junit.runners.JUnit4
+
+@RunWith(JUnit4::class)
+@MediumTest
+class AnimationModifierTest {
+
+ @get:Rule
+ val composeTestRule = createComposeRule()
+
+ @Test
+ fun animateContentSizeTest() {
+ val startWidth = 100
+ val endWidth = 150
+ val startHeight = 400
+ val endHeight = 200
+ var width by mutableStateOf(startWidth)
+ var height by mutableStateOf(startHeight)
+
+ var density = 0f
+ val testModifier by mutableStateOf(TestModifier())
+
+ composeTestRule.clockTestRule.pauseClock()
+ composeTestRule.setContent {
+ Box(
+ testModifier + Modifier.animateContentSize(
+ tween(
+ 200, easing = LinearOutSlowInEasing
+ )
+ ).size(
+ width.dp, height.dp
+ )
+ )
+ density = DensityAmbient.current.density
+ }
+
+ runOnIdle {
+ width = endWidth
+ height = endHeight
+ }
+ waitForIdle()
+
+ for (i in 0..200 step 20) {
+ val fraction = LinearOutSlowInEasing.invoke(i / 200f)
+ assertEquals(
+ density * (startWidth * (1 - fraction) + endWidth * fraction),
+ testModifier.width.toFloat(), 1f
+ )
+
+ assertEquals(
+ density * (startHeight * (1 - fraction) + endHeight * fraction),
+ testModifier.height.toFloat(), 1f
+ )
+
+ composeTestRule.clockTestRule.advanceClock(20)
+ waitForIdle()
+ }
+ }
+}
+
+private class TestModifier : LayoutModifier {
+ var width: Int = 0
+ var height: Int = 0
+ override fun MeasureScope.measure(
+ measurable: Measurable,
+ constraints: Constraints,
+ layoutDirection: LayoutDirection
+ ): MeasureScope.MeasureResult {
+ val placeable = measurable.measure(constraints)
+ width = placeable.width
+ height = placeable.height
+ return layout(width, height) {
+ placeable.place(0, 0)
+ }
+ }
+}