| /* |
| * Copyright 2019 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.platform |
| |
| import android.graphics.Paint |
| import android.text.TextPaint |
| import androidx.compose.ui.text.android.InternalPlatformTextApi |
| import androidx.compose.ui.text.android.LayoutCompat |
| import androidx.compose.ui.text.android.LayoutIntrinsics |
| import androidx.core.text.TextUtilsCompat |
| import androidx.core.view.ViewCompat |
| import androidx.compose.ui.text.intl.AndroidLocale |
| import androidx.compose.ui.text.intl.LocaleList |
| import androidx.compose.ui.text.AnnotatedString |
| import androidx.compose.ui.text.ParagraphIntrinsics |
| import androidx.compose.ui.text.Placeholder |
| import androidx.compose.ui.text.SpanStyle |
| import androidx.compose.ui.text.TextStyle |
| import androidx.compose.ui.text.font.Font |
| import androidx.compose.ui.text.platform.extensions.applySpanStyle |
| import androidx.compose.ui.text.style.TextDirection |
| import androidx.ui.unit.Density |
| import java.util.Locale |
| |
| @OptIn(InternalPlatformTextApi::class) |
| internal class AndroidParagraphIntrinsics( |
| val text: String, |
| val style: TextStyle, |
| val spanStyles: List<AnnotatedString.Range<SpanStyle>>, |
| val placeholders: List<AnnotatedString.Range<Placeholder>>, |
| val typefaceAdapter: TypefaceAdapter, |
| val density: Density |
| ) : ParagraphIntrinsics { |
| |
| internal val textPaint = TextPaint(Paint.ANTI_ALIAS_FLAG) |
| |
| internal val charSequence: CharSequence |
| |
| internal val layoutIntrinsics: LayoutIntrinsics |
| |
| override val maxIntrinsicWidth: Float |
| get() = layoutIntrinsics.maxIntrinsicWidth |
| |
| override val minIntrinsicWidth: Float |
| get() = layoutIntrinsics.minIntrinsicWidth |
| |
| internal val textDirectionHeuristic = resolveTextDirectionHeuristics( |
| style.textDirection, |
| style.localeList |
| ) |
| |
| init { |
| val notAppliedStyle = textPaint.applySpanStyle( |
| style.toSpanStyle(), |
| typefaceAdapter, |
| density |
| ) |
| |
| charSequence = createCharSequence( |
| text = text, |
| contextFontSize = textPaint.textSize, |
| lineHeight = style.lineHeight, |
| textIndent = style.textIndent, |
| spanStyles = listOf( |
| AnnotatedString.Range( |
| notAppliedStyle, |
| 0, |
| text.length |
| ) |
| ) + spanStyles, |
| placeholders = placeholders, |
| density = density, |
| typefaceAdapter = typefaceAdapter |
| ) |
| |
| layoutIntrinsics = LayoutIntrinsics(charSequence, textPaint, textDirectionHeuristic) |
| } |
| } |
| |
| /** |
| * For a given [TextDirection] return [TextLayout] constants for text direction |
| * heuristics. |
| */ |
| @OptIn(InternalPlatformTextApi::class) |
| internal fun resolveTextDirectionHeuristics( |
| textDirection: TextDirection? = null, |
| localeList: LocaleList? = null |
| ): Int { |
| return when (textDirection ?: TextDirection.Content) { |
| TextDirection.ContentOrLtr -> LayoutCompat.TEXT_DIRECTION_FIRST_STRONG_LTR |
| TextDirection.ContentOrRtl -> LayoutCompat.TEXT_DIRECTION_FIRST_STRONG_RTL |
| TextDirection.Ltr -> LayoutCompat.TEXT_DIRECTION_LTR |
| TextDirection.Rtl -> LayoutCompat.TEXT_DIRECTION_RTL |
| TextDirection.Content -> { |
| val currentLocale = localeList?.let { |
| (it[0].platformLocale as AndroidLocale).javaLocale |
| } ?: Locale.getDefault() |
| when (TextUtilsCompat.getLayoutDirectionFromLocale(currentLocale)) { |
| ViewCompat.LAYOUT_DIRECTION_LTR -> LayoutCompat.TEXT_DIRECTION_FIRST_STRONG_LTR |
| ViewCompat.LAYOUT_DIRECTION_RTL -> LayoutCompat.TEXT_DIRECTION_FIRST_STRONG_RTL |
| else -> LayoutCompat.TEXT_DIRECTION_FIRST_STRONG_LTR |
| } |
| } |
| } |
| } |
| |
| // TODO(b/159152328): temporary workaround for desktop. remove when full support of MPP will be in-place |
| @Deprecated( |
| "Temporary workaround. Supposed to be used only in desktop before MPP", |
| level = DeprecationLevel.ERROR |
| ) |
| @InternalPlatformTextApi |
| var paragraphIntrinsicsActualFactory: (( |
| text: String, |
| style: TextStyle, |
| spanStyles: List<AnnotatedString.Range<SpanStyle>>, |
| placeholders: List<AnnotatedString.Range<Placeholder>>, |
| density: Density, |
| resourceLoader: Font.ResourceLoader |
| ) -> ParagraphIntrinsics) = { text, style, spanStyles, placeholders, density, resourceLoader -> |
| AndroidParagraphIntrinsics( |
| text = text, |
| style = style, |
| placeholders = placeholders, |
| typefaceAdapter = TypefaceAdapter( |
| resourceLoader = resourceLoader |
| ), |
| spanStyles = spanStyles, |
| density = density |
| ) |
| } |
| |
| @OptIn(InternalPlatformTextApi::class) |
| internal actual fun ActualParagraphIntrinsics( |
| text: String, |
| style: TextStyle, |
| spanStyles: List<AnnotatedString.Range<SpanStyle>>, |
| placeholders: List<AnnotatedString.Range<Placeholder>>, |
| density: Density, |
| resourceLoader: Font.ResourceLoader |
| ): ParagraphIntrinsics = |
| @Suppress("DEPRECATION_ERROR") |
| paragraphIntrinsicsActualFactory( |
| text, style, spanStyles, placeholders, density, resourceLoader |
| ) |