ui/ui-text-core/src/androidAndroidTest/kotlin/androidx/compose/ui/text/ParagraphPlaceholderIntegrationTest.kt - platform/frameworks/support - Git at Google

 /*
  * 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.ui.text

 import androidx.test.platform.app.InstrumentationRegistry
 import androidx.compose.ui.text.font.asFontFamily
 import androidx.ui.unit.Density
 import androidx.ui.unit.TextUnit
 import androidx.ui.unit.em
 import androidx.ui.unit.sp
 import com.google.common.truth.Truth.assertThat
 import org.junit.Test

 class ParagraphPlaceholderIntegrationTest {
     private val fontFamilyMeasureFont = FontTestData.BASIC_MEASURE_FONT.asFontFamily()
     private val defaultDensity = Density(density = 1f, fontScale = 1f)
     private val context = InstrumentationRegistry.getInstrumentation().context

     @Test
     fun placeHolder_alignAboveBaseLine_lessThanOriginalHeight() {
         val text = "AAA"
         val fontSize = 20
         val height = 0.5.em
         val width = 1.em
         val placeholder = Placeholder(width, height, PlaceholderVerticalAlign.AboveBaseline)

         val paragraph = simpleParagraph(
             text = text,
             fontSize = fontSize.sp,
             placeholders = listOf(AnnotatedString.Range(placeholder, 1, 2)),
             width = Float.MAX_VALUE
         )
         val placeholderRects = paragraph.placeholderRects
         assertThat(placeholderRects.size).isEqualTo(1)
         // Height won't be increased. Notice: in fontFamilyMeasureFont lineHeight = 1.2 * fontSize
         assertThat(paragraph.getLineHeight(0)).isEqualTo(fontSize * 1.2f)

         val bound = placeholderRects[0]!!
         assertThat(bound.bottom).isEqualTo(paragraph.firstBaseline)
         assertThat(bound.top).isEqualTo(paragraph.firstBaseline - height.value * fontSize)
         // There is one character to the left of this placeholder.
         assertThat(bound.left).isEqualTo(fontSize.toFloat())
         assertThat(bound.right).isEqualTo(fontSize + fontSize * width.value)
     }

     @Test
     fun placeHolder_alignAboveBaseLine_greaterThanOriginalHeight() {
         val text = "AAA"
         val fontSize = 20
         val height = 2.em
         val width = 1.em
         val placeholder = Placeholder(width, height, PlaceholderVerticalAlign.AboveBaseline)

         val paragraph = simpleParagraph(
             text = text,
             fontSize = fontSize.sp,
             placeholders = listOf(AnnotatedString.Range(placeholder, 1, 2)),
             width = Float.MAX_VALUE
         )
         val placeholderRects = paragraph.placeholderRects
         assertThat(placeholderRects.size).isEqualTo(1)

         // In the measure font, descent = 0.2 * fontSize, ascent = 1 * fontSize.
         // In this case, ascent is pushed by placeholder to 2 * fontSize, so that
         // lineHeight  = 0.2 * fontSize + 2 * fontSize.
         assertThat(paragraph.getLineHeight(0))
             .isEqualTo(0.2f * fontSize + fontSize * height.value)

         val bound = placeholderRects[0]!!
         assertThat(bound.bottom).isEqualTo(paragraph.firstBaseline)
         assertThat(bound.top).isEqualTo(paragraph.firstBaseline - height.value * fontSize)
         // There is one character to the left of this placeholder.
         assertThat(bound.left).isEqualTo(fontSize.toFloat())
         assertThat(bound.right).isEqualTo(fontSize + fontSize * width.value)
     }

     @Test
     fun placeHolder_alignBottom_lessThanOriginalHeight() {
         val text = "AAA"
         val fontSize = 20
         val height = 0.5.em
         val width = 1.em
         val placeholder = Placeholder(width, height, PlaceholderVerticalAlign.Bottom)

         val paragraph = simpleParagraph(
             text = text,
             fontSize = fontSize.sp,
             placeholders = listOf(AnnotatedString.Range(placeholder, 1, 2)),
             width = Float.MAX_VALUE
         )
         val placeholderRects = paragraph.placeholderRects
         assertThat(placeholderRects.size).isEqualTo(1)

         assertThat(paragraph.getLineHeight(0)).isEqualTo(1.2f * fontSize)

         val bound = placeholderRects[0]!!
         assertThat(bound.bottom).isEqualTo(paragraph.getLineBottom(0))
         assertThat(bound.top)
             .isEqualTo(paragraph.getLineBottom(0) - height.value * fontSize)
         // There is one character to the left of this placeholder.
         assertThat(bound.left).isEqualTo(fontSize.toFloat())
         assertThat(bound.right).isEqualTo(fontSize + fontSize * width.value)
     }

     @Test
     fun placeHolder_alignBottom_greaterThanOriginalHeight() {
         val text = "AAA"
         val fontSize = 20
         val height = 2.em
         val width = 1.em
         val placeholder = Placeholder(width, height, PlaceholderVerticalAlign.Bottom)

         val paragraph = simpleParagraph(
             text = text,
             fontSize = fontSize.sp,
             placeholders = listOf(AnnotatedString.Range(placeholder, 1, 2)),
             width = Float.MAX_VALUE
         )
         val placeholderRects = paragraph.placeholderRects
         assertThat(placeholderRects.size).isEqualTo(1)

         assertThat(paragraph.getLineHeight(0)).isEqualTo(height.value * fontSize)

         val bound = placeholderRects[0]!!
         assertThat(bound.bottom).isEqualTo(paragraph.getLineBottom(0))
         assertThat(bound.top)
             .isEqualTo(paragraph.getLineBottom(0) - height.value * fontSize)
         // There is one character to the left of this placeholder.
         assertThat(bound.left).isEqualTo(fontSize.toFloat())
         assertThat(bound.right).isEqualTo(fontSize + fontSize * width.value)
     }

     @Test
     fun placeHolder_alignTop_lessThanOriginalHeight() {
         val text = "AAA"
         val fontSize = 20
         val height = 0.5.em
         val width = 1.em
         val placeholder = Placeholder(width, height, PlaceholderVerticalAlign.Top)

         val paragraph = simpleParagraph(
             text = text,
             fontSize = fontSize.sp,
             placeholders = listOf(AnnotatedString.Range(placeholder, 1, 2)),
             width = Float.MAX_VALUE
         )
         val placeholderRects = paragraph.placeholderRects
         assertThat(placeholderRects.size).isEqualTo(1)

         assertThat(paragraph.getLineHeight(0)).isEqualTo(1.2f * fontSize)

         val bound = placeholderRects[0]!!
         // TODO(haoyuchang): use getLineTop instead
         assertThat(bound.top).isEqualTo(paragraph.getLineBottom(-1))
         assertThat(bound.bottom)
             .isEqualTo(paragraph.getLineBottom(-1) + height.value * fontSize)
         // There is one character to the left of this placeholder.
         assertThat(bound.left).isEqualTo(fontSize.toFloat())
         assertThat(bound.right).isEqualTo(fontSize + fontSize * width.value)
     }

     @Test
     fun placeHolder_alignTop_greaterThanOriginalHeight() {
         val text = "AAA"
         val fontSize = 20
         val height = 2.em
         val width = 1.em
         val placeholder = Placeholder(width, height, PlaceholderVerticalAlign.Top)

         val paragraph = simpleParagraph(
             text = text,
             fontSize = fontSize.sp,
             placeholders = listOf(AnnotatedString.Range(placeholder, 1, 2)),
             width = Float.MAX_VALUE
         )
         val placeholderRects = paragraph.placeholderRects
         assertThat(placeholderRects.size).isEqualTo(1)

         assertThat(paragraph.getLineHeight(0)).isEqualTo(height.value * fontSize)

         val bound = placeholderRects[0]!!
         // TODO(haoyuchang): use getLineTop instead
         assertThat(bound.top).isEqualTo(paragraph.getLineBottom(-1))
         assertThat(bound.bottom)
             .isEqualTo(paragraph.getLineBottom(-1) + height.value * fontSize)
         // There is one character to the left of this placeholder.
         assertThat(bound.left).isEqualTo(fontSize.toFloat())
         assertThat(bound.right).isEqualTo(fontSize + fontSize * width.value)
     }

     @Test
     fun placeHolder_alignCenter_lessThanOriginalHeight() {
         val text = "AAA"
         val fontSize = 20
         val height = 0.5.em
         val width = 1.em
         val placeholder = Placeholder(width, height, PlaceholderVerticalAlign.Center)

         val paragraph = simpleParagraph(
             text = text,
             fontSize = fontSize.sp,
             placeholders = listOf(AnnotatedString.Range(placeholder, 1, 2)),
             width = Float.MAX_VALUE
         )
         val placeholderRects = paragraph.placeholderRects
         assertThat(placeholderRects.size).isEqualTo(1)

         assertThat(paragraph.getLineHeight(0)).isEqualTo(fontSize * 1.2f)

         val bound = placeholderRects[0]!!
         // TODO(haoyuchang): We need getLineTop(0).
         val lineCenter = (paragraph.getLineBottom(-1) + paragraph.getLineBottom(0)) / 2

         assertThat(bound.top).isEqualTo(lineCenter - height.value * fontSize / 2)
         assertThat(bound.bottom).isEqualTo(lineCenter + height.value * fontSize / 2)

         // There is one character to the left of this placeholder.
         assertThat(bound.left).isEqualTo(fontSize.toFloat())
         assertThat(bound.right).isEqualTo(fontSize + fontSize * width.value)
     }

     @Test
     fun placeHolder_alignCenter_greaterThanOriginalHeight() {
         val text = "AAA"
         val fontSize = 20
         val height = 2.em
         val width = 1.em
         val placeholder = Placeholder(width, height, PlaceholderVerticalAlign.Center)

         val paragraph = simpleParagraph(
             text = text,
             fontSize = fontSize.sp,
             placeholders = listOf(AnnotatedString.Range(placeholder, 1, 2)),
             width = Float.MAX_VALUE
         )
         val placeholderRects = paragraph.placeholderRects
         assertThat(placeholderRects.size).isEqualTo(1)

         assertThat(paragraph.getLineHeight(0)).isEqualTo(fontSize * height.value)

         val bound = placeholderRects[0]!!
         // TODO(haoyuchang): We need getLineTop(0).
         val lineCenter = (paragraph.getLineBottom(-1) + paragraph.getLineBottom(0)) / 2

         assertThat(bound.top).isEqualTo(lineCenter - height.value * fontSize / 2)
         assertThat(bound.bottom).isEqualTo(lineCenter + height.value * fontSize / 2)

         // There is one character to the left of this placeholder.
         assertThat(bound.left).isEqualTo(fontSize.toFloat())
         assertThat(bound.right).isEqualTo(fontSize + fontSize * width.value)
     }

     @Test
     fun placeHolder_alignTextTop() {
         val text = "AAB"
         val fontSize = 20
         val fontSizeSpan = 30

         val height = 0.5.em
         val width = 1.em
         val placeholder = Placeholder(width, height, PlaceholderVerticalAlign.TextTop)
         val paragraph = simpleParagraph(
             text = text,
             spanStyles = listOf(
                 AnnotatedString.Range(SpanStyle(fontSize = fontSizeSpan.sp), 2, 3)
             ),
             placeholders = listOf(AnnotatedString.Range(placeholder, 1, 2)),
             fontSize = fontSize.sp,
             width = Float.MAX_VALUE
         )
         val placeholderRects = paragraph.placeholderRects
         assertThat(placeholderRects.size).isEqualTo(1)

         val bound = placeholderRects[0]!!
         // TextTop aligns the inline element to top of the proceeding text.
         // In the measurement font, the top equals to fontSize pixels above baseline.
         val expectedTop = paragraph.firstBaseline - fontSize
         assertThat(bound.top).isEqualTo(expectedTop)
         assertThat(bound.bottom).isEqualTo(expectedTop + height.value * fontSize)
         // There is one character to the left of this placeholder.
         assertThat(bound.left).isEqualTo(fontSize.toFloat())
         assertThat(bound.right).isEqualTo(fontSize + fontSize * width.value)
     }

     @Test
     fun placeHolder_alignTextBottom() {
         val text = "AAB"
         val fontSize = 20
         val fontSizeSpan = 30

         val height = 0.5.em
         val width = 1.em
         val placeholder = Placeholder(width, height, PlaceholderVerticalAlign.TextBottom)
         val paragraph = simpleParagraph(
             text = text,
             spanStyles = listOf(
                 AnnotatedString.Range(SpanStyle(fontSize = fontSizeSpan.sp), 2, 3)
             ),
             placeholders = listOf(AnnotatedString.Range(placeholder, 1, 2)),
             fontSize = fontSize.sp,
             width = Float.MAX_VALUE
         )
         val placeholderRects = paragraph.placeholderRects
         assertThat(placeholderRects.size).isEqualTo(1)

         val bound = placeholderRects[0]!!
         // TextBottom aligns the inline element to bottom of the proceeding text.
         // In the measurement font, the bottom equals to fontSize * 0.2 pixels below baseline.
         val expectedBottom = paragraph.firstBaseline + fontSize * 0.2f
         assertThat(bound.bottom).isEqualTo(expectedBottom)
         assertThat(bound.top).isEqualTo(expectedBottom - height.value * fontSize)
         // There is one character to the left of this placeholder.
         assertThat(bound.left).isEqualTo(fontSize.toFloat())
         assertThat(bound.right).isEqualTo(fontSize + fontSize * width.value)
     }

     @Test
     fun placeHolder_alignTextCenter() {
         val text = "AAB"
         val fontSize = 20
         val fontSizeSpan = 30

         val height = 0.5.em
         val width = 1.em
         val placeholder = Placeholder(width, height, PlaceholderVerticalAlign.TextCenter)
         val paragraph = simpleParagraph(
             text = text,
             spanStyles = listOf(
                 AnnotatedString.Range(SpanStyle(fontSize = fontSizeSpan.sp), 2, 3)
             ),
             placeholders = listOf(AnnotatedString.Range(placeholder, 1, 2)),
             fontSize = fontSize.sp,
             width = Float.MAX_VALUE
         )
         val placeholderRects = paragraph.placeholderRects
         assertThat(placeholderRects.size).isEqualTo(1)

         val bound = placeholderRects[0]!!
         // TextCenter aligns the inline element to center of the proceeding text.
         // In the measurement font, the center equals to fontSize * 0.3 pixels above baseline.
         val expectedCenter = paragraph.firstBaseline - fontSize * 0.4f
         assertThat(bound.top).isEqualTo(expectedCenter - height.value * fontSize / 2)
         assertThat(bound.bottom).isEqualTo(expectedCenter + height.value * fontSize / 2)

         // There is one character to the left of this placeholder.
         assertThat(bound.left).isEqualTo(fontSize.toFloat())
         assertThat(bound.right).isEqualTo(fontSize + fontSize * width.value)
     }

     @Test
     fun placeHolder_withRtlText() {
         val text = "\u05D0\u05D0\u05D0\u05D0"
         val fontSize = 20f
         val paragraphWidth = fontSize * (text.length + 3)

         val height = 1.em
         val width = 1.em
         val placeholder = Placeholder(width, height, PlaceholderVerticalAlign.AboveBaseline)
         val paragraph = simpleParagraph(
             text = text,
             placeholders = listOf(AnnotatedString.Range(placeholder, 1, 2)),
             fontSize = fontSize.sp,
             width = paragraphWidth
         )
         val placeholderRects = paragraph.placeholderRects
         assertThat(placeholderRects.size).isEqualTo(1)
         assertThat(paragraph.lineCount).isEqualTo(1)

         val bound = placeholderRects[0]!!
         val expectedBottom = paragraph.firstBaseline
         assertThat(bound.top).isEqualTo(expectedBottom - height.value * fontSize)
         assertThat(bound.bottom).isEqualTo(expectedBottom)

         // Text is alight right: |   RR_R|
         assertThat(bound.left).isEqualTo(paragraphWidth - 2 * fontSize)
         assertThat(bound.right).isEqualTo(paragraphWidth - 1 * fontSize)
     }

     @Test
     fun placeHolder_withBiDiText_coversRtlChar() {
         val text = "\u05D0\u05D0AA"
         val fontSize = 20f
         val paragraphWidth = fontSize * (text.length + 3)

         val height = 1.em
         val width = 1.em
         val placeholder = Placeholder(width, height, PlaceholderVerticalAlign.AboveBaseline)
         val paragraph = simpleParagraph(
             text = text,
             placeholders = listOf(AnnotatedString.Range(placeholder, 1, 2)),
             fontSize = fontSize.sp,
             width = paragraphWidth
         )
         val placeholderRects = paragraph.placeholderRects
         assertThat(placeholderRects.size).isEqualTo(1)
         assertThat(paragraph.lineCount).isEqualTo(1)

         val bound = placeholderRects[0]!!
         val expectedBottom = paragraph.firstBaseline
         assertThat(bound.top).isEqualTo(expectedBottom - height.value * fontSize)
         assertThat(bound.bottom).isEqualTo(expectedBottom)

         // Text is align right: |   LL_R|
         assertThat(bound.left).isEqualTo(paragraphWidth - 2 * fontSize)
         assertThat(bound.right).isEqualTo(paragraphWidth - 1 * fontSize)
     }

     @Test
     fun placeHolder_withBiDiText_coversLtrChar() {
         val text = "\u05D0\u05D0AA"
         val fontSize = 20f
         val paragraphWidth = fontSize * (text.length + 3)

         val height = 1.em
         val width = 1.em
         val placeholder = Placeholder(width, height, PlaceholderVerticalAlign.AboveBaseline)
         val paragraph = simpleParagraph(
             text = text,
             placeholders = listOf(AnnotatedString.Range(placeholder, 2, 3)),
             fontSize = fontSize.sp,
             width = paragraphWidth
         )
         val placeholderRects = paragraph.placeholderRects
         assertThat(placeholderRects.size).isEqualTo(1)
         assertThat(paragraph.lineCount).isEqualTo(1)

         val bound = placeholderRects[0]!!
         val expectedBottom = paragraph.firstBaseline
         assertThat(bound.top).isEqualTo(expectedBottom - height.value * fontSize)
         assertThat(bound.bottom).isEqualTo(expectedBottom)

         // Text is align right: |   L_RR|
         assertThat(bound.left).isEqualTo(paragraphWidth - 3 * fontSize)
         assertThat(bound.right).isEqualTo(paragraphWidth - 2 * fontSize)
     }

     @Test
     fun placeHolder_withBiDiText_coversBiDiStr() {
         val text = "\u05D0\u05D0AA"
         val fontSize = 20f
         val paragraphWidth = fontSize * (text.length + 3)

         val height = 1.em
         val width = 1.em
         val placeholder = Placeholder(width, height, PlaceholderVerticalAlign.AboveBaseline)
         val paragraph = simpleParagraph(
             text = text,
             placeholders = listOf(AnnotatedString.Range(placeholder, 1, 3)),
             fontSize = fontSize.sp,
             width = paragraphWidth
         )
         val placeholderRects = paragraph.placeholderRects
         assertThat(placeholderRects.size).isEqualTo(1)
         assertThat(paragraph.lineCount).isEqualTo(1)

         val bound = placeholderRects[0]!!
         val expectedBottom = paragraph.firstBaseline
         assertThat(bound.top).isEqualTo(expectedBottom - height.value * fontSize)
         assertThat(bound.bottom).isEqualTo(expectedBottom)

         // Text is align right, 2 chars are covered: |   L_R|
         assertThat(bound.left).isEqualTo(paragraphWidth - 2 * fontSize)
         assertThat(bound.right).isEqualTo(paragraphWidth - 1 * fontSize)
     }

     @Test
     fun placeHolderRects_ellipsized() {
         val text = "ABC"
         val fontSize = 20f

         val placeholder = Placeholder(1.em, 1.em, PlaceholderVerticalAlign.TextCenter)
         val placeholders = listOf(
             AnnotatedString.Range(placeholder, 0, 1),
             AnnotatedString.Range(placeholder, 2, 3)
         )
         val paragraph = simpleParagraph(
             text = text,
             placeholders = placeholders,
             fontSize = fontSize.sp,
             width = 2 * fontSize,
             maxLines = 1,
             ellipsis = true
         )
         val placeholderRects = paragraph.placeholderRects
         assertThat(placeholderRects.size).isEqualTo(placeholders.size)
         assertThat(placeholderRects[0]).isNotNull()
         // The second placeholder should be ellipsized.
         assertThat(placeholderRects[1]).isNull()
     }

     private fun simpleParagraph(
         text: String = "",
         fontSize: TextUnit = TextUnit.Inherit,
         spanStyles: List<AnnotatedString.Range<SpanStyle>> = listOf(),
         placeholders: List<AnnotatedString.Range<Placeholder>> = listOf(),
         width: Float = Float.MAX_VALUE,
         maxLines: Int = Int.MAX_VALUE,
         ellipsis: Boolean = false
     ): Paragraph {
         return Paragraph(
             text = text,
             style = TextStyle(
                 fontSize = fontSize,
                 fontFamily = fontFamilyMeasureFont
             ),
             spanStyles = spanStyles,
             placeholders = placeholders,
             maxLines = maxLines,
             ellipsis = ellipsis,
             constraints = ParagraphConstraints(width = width),
             density = defaultDensity,
             resourceLoader = TestFontResourceLoader(context)
         )
     }
 }
	/*
	* 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.ui.text

	import androidx.test.platform.app.InstrumentationRegistry
	import androidx.compose.ui.text.font.asFontFamily
	import androidx.ui.unit.Density
	import androidx.ui.unit.TextUnit
	import androidx.ui.unit.em
	import androidx.ui.unit.sp
	import com.google.common.truth.Truth.assertThat
	import org.junit.Test

	class ParagraphPlaceholderIntegrationTest {
	private val fontFamilyMeasureFont = FontTestData.BASIC_MEASURE_FONT.asFontFamily()
	private val defaultDensity = Density(density = 1f, fontScale = 1f)
	private val context = InstrumentationRegistry.getInstrumentation().context

	@Test
	fun placeHolder_alignAboveBaseLine_lessThanOriginalHeight() {
	val text = "AAA"
	val fontSize = 20
	val height = 0.5.em
	val width = 1.em
	val placeholder = Placeholder(width, height, PlaceholderVerticalAlign.AboveBaseline)

	val paragraph = simpleParagraph(
	text = text,
	fontSize = fontSize.sp,
	placeholders = listOf(AnnotatedString.Range(placeholder, 1, 2)),
	width = Float.MAX_VALUE
	)
	val placeholderRects = paragraph.placeholderRects
	assertThat(placeholderRects.size).isEqualTo(1)
	// Height won't be increased. Notice: in fontFamilyMeasureFont lineHeight = 1.2 * fontSize
	assertThat(paragraph.getLineHeight(0)).isEqualTo(fontSize * 1.2f)

	val bound = placeholderRects[0]!!
	assertThat(bound.bottom).isEqualTo(paragraph.firstBaseline)
	assertThat(bound.top).isEqualTo(paragraph.firstBaseline - height.value * fontSize)
	// There is one character to the left of this placeholder.
	assertThat(bound.left).isEqualTo(fontSize.toFloat())
	assertThat(bound.right).isEqualTo(fontSize + fontSize * width.value)
	}

	@Test
	fun placeHolder_alignAboveBaseLine_greaterThanOriginalHeight() {
	val text = "AAA"
	val fontSize = 20
	val height = 2.em
	val width = 1.em
	val placeholder = Placeholder(width, height, PlaceholderVerticalAlign.AboveBaseline)

	val paragraph = simpleParagraph(
	text = text,
	fontSize = fontSize.sp,
	placeholders = listOf(AnnotatedString.Range(placeholder, 1, 2)),
	width = Float.MAX_VALUE
	)
	val placeholderRects = paragraph.placeholderRects
	assertThat(placeholderRects.size).isEqualTo(1)

	// In the measure font, descent = 0.2 * fontSize, ascent = 1 * fontSize.
	// In this case, ascent is pushed by placeholder to 2 * fontSize, so that
	// lineHeight = 0.2 * fontSize + 2 * fontSize.
	assertThat(paragraph.getLineHeight(0))
	.isEqualTo(0.2f * fontSize + fontSize * height.value)

	val bound = placeholderRects[0]!!
	assertThat(bound.bottom).isEqualTo(paragraph.firstBaseline)
	assertThat(bound.top).isEqualTo(paragraph.firstBaseline - height.value * fontSize)
	// There is one character to the left of this placeholder.
	assertThat(bound.left).isEqualTo(fontSize.toFloat())
	assertThat(bound.right).isEqualTo(fontSize + fontSize * width.value)
	}

	@Test
	fun placeHolder_alignBottom_lessThanOriginalHeight() {
	val text = "AAA"
	val fontSize = 20
	val height = 0.5.em
	val width = 1.em
	val placeholder = Placeholder(width, height, PlaceholderVerticalAlign.Bottom)

	val paragraph = simpleParagraph(
	text = text,
	fontSize = fontSize.sp,
	placeholders = listOf(AnnotatedString.Range(placeholder, 1, 2)),
	width = Float.MAX_VALUE
	)
	val placeholderRects = paragraph.placeholderRects
	assertThat(placeholderRects.size).isEqualTo(1)

	assertThat(paragraph.getLineHeight(0)).isEqualTo(1.2f * fontSize)

	val bound = placeholderRects[0]!!
	assertThat(bound.bottom).isEqualTo(paragraph.getLineBottom(0))
	assertThat(bound.top)
	.isEqualTo(paragraph.getLineBottom(0) - height.value * fontSize)
	// There is one character to the left of this placeholder.
	assertThat(bound.left).isEqualTo(fontSize.toFloat())
	assertThat(bound.right).isEqualTo(fontSize + fontSize * width.value)
	}

	@Test
	fun placeHolder_alignBottom_greaterThanOriginalHeight() {
	val text = "AAA"
	val fontSize = 20
	val height = 2.em
	val width = 1.em
	val placeholder = Placeholder(width, height, PlaceholderVerticalAlign.Bottom)

	val paragraph = simpleParagraph(
	text = text,
	fontSize = fontSize.sp,
	placeholders = listOf(AnnotatedString.Range(placeholder, 1, 2)),
	width = Float.MAX_VALUE
	)
	val placeholderRects = paragraph.placeholderRects
	assertThat(placeholderRects.size).isEqualTo(1)

	assertThat(paragraph.getLineHeight(0)).isEqualTo(height.value * fontSize)

	val bound = placeholderRects[0]!!
	assertThat(bound.bottom).isEqualTo(paragraph.getLineBottom(0))
	assertThat(bound.top)
	.isEqualTo(paragraph.getLineBottom(0) - height.value * fontSize)
	// There is one character to the left of this placeholder.
	assertThat(bound.left).isEqualTo(fontSize.toFloat())
	assertThat(bound.right).isEqualTo(fontSize + fontSize * width.value)
	}

	@Test
	fun placeHolder_alignTop_lessThanOriginalHeight() {
	val text = "AAA"
	val fontSize = 20
	val height = 0.5.em
	val width = 1.em
	val placeholder = Placeholder(width, height, PlaceholderVerticalAlign.Top)

	val paragraph = simpleParagraph(
	text = text,
	fontSize = fontSize.sp,
	placeholders = listOf(AnnotatedString.Range(placeholder, 1, 2)),
	width = Float.MAX_VALUE
	)
	val placeholderRects = paragraph.placeholderRects
	assertThat(placeholderRects.size).isEqualTo(1)

	assertThat(paragraph.getLineHeight(0)).isEqualTo(1.2f * fontSize)

	val bound = placeholderRects[0]!!
	// TODO(haoyuchang): use getLineTop instead
	assertThat(bound.top).isEqualTo(paragraph.getLineBottom(-1))
	assertThat(bound.bottom)
	.isEqualTo(paragraph.getLineBottom(-1) + height.value * fontSize)
	// There is one character to the left of this placeholder.
	assertThat(bound.left).isEqualTo(fontSize.toFloat())
	assertThat(bound.right).isEqualTo(fontSize + fontSize * width.value)
	}

	@Test
	fun placeHolder_alignTop_greaterThanOriginalHeight() {
	val text = "AAA"
	val fontSize = 20
	val height = 2.em
	val width = 1.em
	val placeholder = Placeholder(width, height, PlaceholderVerticalAlign.Top)

	val paragraph = simpleParagraph(
	text = text,
	fontSize = fontSize.sp,
	placeholders = listOf(AnnotatedString.Range(placeholder, 1, 2)),
	width = Float.MAX_VALUE
	)
	val placeholderRects = paragraph.placeholderRects
	assertThat(placeholderRects.size).isEqualTo(1)

	assertThat(paragraph.getLineHeight(0)).isEqualTo(height.value * fontSize)

	val bound = placeholderRects[0]!!
	// TODO(haoyuchang): use getLineTop instead
	assertThat(bound.top).isEqualTo(paragraph.getLineBottom(-1))
	assertThat(bound.bottom)
	.isEqualTo(paragraph.getLineBottom(-1) + height.value * fontSize)
	// There is one character to the left of this placeholder.
	assertThat(bound.left).isEqualTo(fontSize.toFloat())
	assertThat(bound.right).isEqualTo(fontSize + fontSize * width.value)
	}

	@Test
	fun placeHolder_alignCenter_lessThanOriginalHeight() {
	val text = "AAA"
	val fontSize = 20
	val height = 0.5.em
	val width = 1.em
	val placeholder = Placeholder(width, height, PlaceholderVerticalAlign.Center)

	val paragraph = simpleParagraph(
	text = text,
	fontSize = fontSize.sp,
	placeholders = listOf(AnnotatedString.Range(placeholder, 1, 2)),
	width = Float.MAX_VALUE
	)
	val placeholderRects = paragraph.placeholderRects
	assertThat(placeholderRects.size).isEqualTo(1)

	assertThat(paragraph.getLineHeight(0)).isEqualTo(fontSize * 1.2f)

	val bound = placeholderRects[0]!!
	// TODO(haoyuchang): We need getLineTop(0).
	val lineCenter = (paragraph.getLineBottom(-1) + paragraph.getLineBottom(0)) / 2

	assertThat(bound.top).isEqualTo(lineCenter - height.value * fontSize / 2)
	assertThat(bound.bottom).isEqualTo(lineCenter + height.value * fontSize / 2)

	// There is one character to the left of this placeholder.
	assertThat(bound.left).isEqualTo(fontSize.toFloat())
	assertThat(bound.right).isEqualTo(fontSize + fontSize * width.value)
	}

	@Test
	fun placeHolder_alignCenter_greaterThanOriginalHeight() {
	val text = "AAA"
	val fontSize = 20
	val height = 2.em
	val width = 1.em
	val placeholder = Placeholder(width, height, PlaceholderVerticalAlign.Center)

	val paragraph = simpleParagraph(
	text = text,
	fontSize = fontSize.sp,
	placeholders = listOf(AnnotatedString.Range(placeholder, 1, 2)),
	width = Float.MAX_VALUE
	)
	val placeholderRects = paragraph.placeholderRects
	assertThat(placeholderRects.size).isEqualTo(1)

	assertThat(paragraph.getLineHeight(0)).isEqualTo(fontSize * height.value)

	val bound = placeholderRects[0]!!
	// TODO(haoyuchang): We need getLineTop(0).
	val lineCenter = (paragraph.getLineBottom(-1) + paragraph.getLineBottom(0)) / 2

	assertThat(bound.top).isEqualTo(lineCenter - height.value * fontSize / 2)
	assertThat(bound.bottom).isEqualTo(lineCenter + height.value * fontSize / 2)

	// There is one character to the left of this placeholder.
	assertThat(bound.left).isEqualTo(fontSize.toFloat())
	assertThat(bound.right).isEqualTo(fontSize + fontSize * width.value)
	}

	@Test
	fun placeHolder_alignTextTop() {
	val text = "AAB"
	val fontSize = 20
	val fontSizeSpan = 30

	val height = 0.5.em
	val width = 1.em
	val placeholder = Placeholder(width, height, PlaceholderVerticalAlign.TextTop)
	val paragraph = simpleParagraph(
	text = text,
	spanStyles = listOf(
	AnnotatedString.Range(SpanStyle(fontSize = fontSizeSpan.sp), 2, 3)
	),
	placeholders = listOf(AnnotatedString.Range(placeholder, 1, 2)),
	fontSize = fontSize.sp,
	width = Float.MAX_VALUE
	)
	val placeholderRects = paragraph.placeholderRects
	assertThat(placeholderRects.size).isEqualTo(1)

	val bound = placeholderRects[0]!!
	// TextTop aligns the inline element to top of the proceeding text.
	// In the measurement font, the top equals to fontSize pixels above baseline.
	val expectedTop = paragraph.firstBaseline - fontSize
	assertThat(bound.top).isEqualTo(expectedTop)
	assertThat(bound.bottom).isEqualTo(expectedTop + height.value * fontSize)
	// There is one character to the left of this placeholder.
	assertThat(bound.left).isEqualTo(fontSize.toFloat())
	assertThat(bound.right).isEqualTo(fontSize + fontSize * width.value)
	}

	@Test
	fun placeHolder_alignTextBottom() {
	val text = "AAB"
	val fontSize = 20
	val fontSizeSpan = 30

	val height = 0.5.em
	val width = 1.em
	val placeholder = Placeholder(width, height, PlaceholderVerticalAlign.TextBottom)
	val paragraph = simpleParagraph(
	text = text,
	spanStyles = listOf(
	AnnotatedString.Range(SpanStyle(fontSize = fontSizeSpan.sp), 2, 3)
	),
	placeholders = listOf(AnnotatedString.Range(placeholder, 1, 2)),
	fontSize = fontSize.sp,
	width = Float.MAX_VALUE
	)
	val placeholderRects = paragraph.placeholderRects
	assertThat(placeholderRects.size).isEqualTo(1)

	val bound = placeholderRects[0]!!
	// TextBottom aligns the inline element to bottom of the proceeding text.
	// In the measurement font, the bottom equals to fontSize * 0.2 pixels below baseline.
	val expectedBottom = paragraph.firstBaseline + fontSize * 0.2f
	assertThat(bound.bottom).isEqualTo(expectedBottom)
	assertThat(bound.top).isEqualTo(expectedBottom - height.value * fontSize)
	// There is one character to the left of this placeholder.
	assertThat(bound.left).isEqualTo(fontSize.toFloat())
	assertThat(bound.right).isEqualTo(fontSize + fontSize * width.value)
	}

	@Test
	fun placeHolder_alignTextCenter() {
	val text = "AAB"
	val fontSize = 20
	val fontSizeSpan = 30

	val height = 0.5.em
	val width = 1.em
	val placeholder = Placeholder(width, height, PlaceholderVerticalAlign.TextCenter)
	val paragraph = simpleParagraph(
	text = text,
	spanStyles = listOf(
	AnnotatedString.Range(SpanStyle(fontSize = fontSizeSpan.sp), 2, 3)
	),
	placeholders = listOf(AnnotatedString.Range(placeholder, 1, 2)),
	fontSize = fontSize.sp,
	width = Float.MAX_VALUE
	)
	val placeholderRects = paragraph.placeholderRects
	assertThat(placeholderRects.size).isEqualTo(1)

	val bound = placeholderRects[0]!!
	// TextCenter aligns the inline element to center of the proceeding text.
	// In the measurement font, the center equals to fontSize * 0.3 pixels above baseline.
	val expectedCenter = paragraph.firstBaseline - fontSize * 0.4f
	assertThat(bound.top).isEqualTo(expectedCenter - height.value * fontSize / 2)
	assertThat(bound.bottom).isEqualTo(expectedCenter + height.value * fontSize / 2)

	// There is one character to the left of this placeholder.
	assertThat(bound.left).isEqualTo(fontSize.toFloat())
	assertThat(bound.right).isEqualTo(fontSize + fontSize * width.value)
	}

	@Test
	fun placeHolder_withRtlText() {
	val text = "\u05D0\u05D0\u05D0\u05D0"
	val fontSize = 20f
	val paragraphWidth = fontSize * (text.length + 3)

	val height = 1.em
	val width = 1.em
	val placeholder = Placeholder(width, height, PlaceholderVerticalAlign.AboveBaseline)
	val paragraph = simpleParagraph(
	text = text,
	placeholders = listOf(AnnotatedString.Range(placeholder, 1, 2)),
	fontSize = fontSize.sp,
	width = paragraphWidth
	)
	val placeholderRects = paragraph.placeholderRects
	assertThat(placeholderRects.size).isEqualTo(1)
	assertThat(paragraph.lineCount).isEqualTo(1)

	val bound = placeholderRects[0]!!
	val expectedBottom = paragraph.firstBaseline
	assertThat(bound.top).isEqualTo(expectedBottom - height.value * fontSize)
	assertThat(bound.bottom).isEqualTo(expectedBottom)

	// Text is alight right: \| RR_R\|
	assertThat(bound.left).isEqualTo(paragraphWidth - 2 * fontSize)
	assertThat(bound.right).isEqualTo(paragraphWidth - 1 * fontSize)
	}

	@Test
	fun placeHolder_withBiDiText_coversRtlChar() {
	val text = "\u05D0\u05D0AA"
	val fontSize = 20f
	val paragraphWidth = fontSize * (text.length + 3)

	val height = 1.em
	val width = 1.em
	val placeholder = Placeholder(width, height, PlaceholderVerticalAlign.AboveBaseline)
	val paragraph = simpleParagraph(
	text = text,
	placeholders = listOf(AnnotatedString.Range(placeholder, 1, 2)),
	fontSize = fontSize.sp,
	width = paragraphWidth
	)
	val placeholderRects = paragraph.placeholderRects
	assertThat(placeholderRects.size).isEqualTo(1)
	assertThat(paragraph.lineCount).isEqualTo(1)

	val bound = placeholderRects[0]!!
	val expectedBottom = paragraph.firstBaseline
	assertThat(bound.top).isEqualTo(expectedBottom - height.value * fontSize)
	assertThat(bound.bottom).isEqualTo(expectedBottom)

	// Text is align right: \| LL_R\|
	assertThat(bound.left).isEqualTo(paragraphWidth - 2 * fontSize)
	assertThat(bound.right).isEqualTo(paragraphWidth - 1 * fontSize)
	}

	@Test
	fun placeHolder_withBiDiText_coversLtrChar() {
	val text = "\u05D0\u05D0AA"
	val fontSize = 20f
	val paragraphWidth = fontSize * (text.length + 3)

	val height = 1.em
	val width = 1.em
	val placeholder = Placeholder(width, height, PlaceholderVerticalAlign.AboveBaseline)
	val paragraph = simpleParagraph(
	text = text,
	placeholders = listOf(AnnotatedString.Range(placeholder, 2, 3)),
	fontSize = fontSize.sp,
	width = paragraphWidth
	)
	val placeholderRects = paragraph.placeholderRects
	assertThat(placeholderRects.size).isEqualTo(1)
	assertThat(paragraph.lineCount).isEqualTo(1)

	val bound = placeholderRects[0]!!
	val expectedBottom = paragraph.firstBaseline
	assertThat(bound.top).isEqualTo(expectedBottom - height.value * fontSize)
	assertThat(bound.bottom).isEqualTo(expectedBottom)

	// Text is align right: \| L_RR\|
	assertThat(bound.left).isEqualTo(paragraphWidth - 3 * fontSize)
	assertThat(bound.right).isEqualTo(paragraphWidth - 2 * fontSize)
	}

	@Test
	fun placeHolder_withBiDiText_coversBiDiStr() {
	val text = "\u05D0\u05D0AA"
	val fontSize = 20f
	val paragraphWidth = fontSize * (text.length + 3)

	val height = 1.em
	val width = 1.em
	val placeholder = Placeholder(width, height, PlaceholderVerticalAlign.AboveBaseline)
	val paragraph = simpleParagraph(
	text = text,
	placeholders = listOf(AnnotatedString.Range(placeholder, 1, 3)),
	fontSize = fontSize.sp,
	width = paragraphWidth
	)
	val placeholderRects = paragraph.placeholderRects
	assertThat(placeholderRects.size).isEqualTo(1)
	assertThat(paragraph.lineCount).isEqualTo(1)

	val bound = placeholderRects[0]!!
	val expectedBottom = paragraph.firstBaseline
	assertThat(bound.top).isEqualTo(expectedBottom - height.value * fontSize)
	assertThat(bound.bottom).isEqualTo(expectedBottom)

	// Text is align right, 2 chars are covered: \| L_R\|
	assertThat(bound.left).isEqualTo(paragraphWidth - 2 * fontSize)
	assertThat(bound.right).isEqualTo(paragraphWidth - 1 * fontSize)
	}

	@Test
	fun placeHolderRects_ellipsized() {
	val text = "ABC"
	val fontSize = 20f

	val placeholder = Placeholder(1.em, 1.em, PlaceholderVerticalAlign.TextCenter)
	val placeholders = listOf(
	AnnotatedString.Range(placeholder, 0, 1),
	AnnotatedString.Range(placeholder, 2, 3)
	)
	val paragraph = simpleParagraph(
	text = text,
	placeholders = placeholders,
	fontSize = fontSize.sp,
	width = 2 * fontSize,
	maxLines = 1,
	ellipsis = true
	)
	val placeholderRects = paragraph.placeholderRects
	assertThat(placeholderRects.size).isEqualTo(placeholders.size)
	assertThat(placeholderRects[0]).isNotNull()
	// The second placeholder should be ellipsized.
	assertThat(placeholderRects[1]).isNull()
	}

	private fun simpleParagraph(
	text: String = "",
	fontSize: TextUnit = TextUnit.Inherit,
	spanStyles: List<AnnotatedString.Range<SpanStyle>> = listOf(),
	placeholders: List<AnnotatedString.Range<Placeholder>> = listOf(),
	width: Float = Float.MAX_VALUE,
	maxLines: Int = Int.MAX_VALUE,
	ellipsis: Boolean = false
	): Paragraph {
	return Paragraph(
	text = text,
	style = TextStyle(
	fontSize = fontSize,
	fontFamily = fontFamilyMeasureFont
	),
	spanStyles = spanStyles,
	placeholders = placeholders,
	maxLines = maxLines,
	ellipsis = ellipsis,
	constraints = ParagraphConstraints(width = width),
	density = defaultDensity,
	resourceLoader = TestFontResourceLoader(context)
	)
	}
	}