Untitled
kotlin
a month ago
2.1 kB
3
Indexable
Never
/* * Copyright 2023 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.unit import androidx.compose.runtime.Immutable import androidx.compose.runtime.Stable import androidx.compose.ui.unit.fontscaling.FontScaleConverterFactory import androidx.compose.ui.unit.internal.JvmDefaultWithCompatibility /** * Converts [TextUnit] to [Dp] and vice-versa. * * Note that the converter can't be cached in the interface itself. FontScaleConverterFactory * already caches the tables, but it still does a a map lookup for each conversion. If you are * implementing this interface, you should cache your own converter for additional speed. */ @Immutable @JvmDefaultWithCompatibility actual interface FontScalable { /** * Current user preference for the scaling factor for fonts. */ @Stable actual val fontScale: Float /** * Convert [Dp] to Sp. Sp is used for font size, etc. */ @Stable actual fun Dp.toSp(): TextUnit { val converter = FontScaleConverterFactory.forScale(fontScale) return (converter?.convertDpToSp(value) ?: (value / fontScale)).sp } /** * Convert Sp to [Dp]. * @throws IllegalStateException if TextUnit other than SP unit is specified. */ @Stable actual fun TextUnit.toDp(): Dp { check(type == TextUnitType.Sp) { "Only Sp can convert to Px" } val converter = FontScaleConverterFactory.forScale(fontScale) return if (converter == null) Dp(value * fontScale) else Dp(converter.convertSpToDp(value)) } }