/*
* Copyright 2021 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.font
import android.graphics.Typeface
import android.os.Build
import androidx.compose.ui.text.ExperimentalTextApi
import androidx.compose.ui.text.platform.AndroidTypeface
@ExperimentalTextApi
internal actual class PlatformFontFamilyTypefaceAdapter : FontFamilyTypefaceAdapter {
override fun resolve(
typefaceRequest: TypefaceRequest,
platformFontLoader: PlatformFontLoader,
onAsyncCompletion: (TypefaceResult.Immutable) -> Unit,
createDefaultTypeface: (TypefaceRequest) -> Any
): TypefaceResult? {
val result: Typeface = when (typefaceRequest.fontFamily) {
null, is DefaultFontFamily -> create(
null,
typefaceRequest.fontWeight,
typefaceRequest.fontStyle
)
is GenericFontFamily -> create(
typefaceRequest.fontFamily.name,
typefaceRequest.fontWeight,
typefaceRequest.fontStyle
)
is LoadedFontFamily -> {
(typefaceRequest.fontFamily.typeface as AndroidTypeface).getNativeTypeface(
typefaceRequest.fontWeight,
typefaceRequest.fontStyle,
typefaceRequest.fontSynthesis
)
}
else -> return null // exit to make result non-null
}
return TypefaceResult.Immutable(result)
}
/**
* Creates a Typeface object based on the system installed fonts. [genericFontFamily] is used
* to define the main family to create the Typeface such as serif, sans-serif.
*
* [fontWeight] is used to define the thickness of the Typeface. Before Android 28 font weight
* cannot be defined therefore this function assumes anything at and above [FontWeight.W600]
* is bold and any value less than [FontWeight.W600] is normal.
*
* @param genericFontFamily generic font family name such as serif, sans-serif
* @param fontWeight the font weight to create the typeface in
* @param fontStyle the font style to create the typeface in
*/
private fun create(
genericFontFamily: String? = null,
fontWeight: FontWeight = FontWeight.Normal,
fontStyle: FontStyle = FontStyle.Normal
): Typeface {
if (fontStyle == FontStyle.Normal &&
fontWeight == FontWeight.Normal &&
genericFontFamily.isNullOrEmpty()
) {
return Typeface.DEFAULT
}
return if (Build.VERSION.SDK_INT < 28) {
val targetStyle = getAndroidTypefaceStyle(fontWeight, fontStyle)
if (genericFontFamily.isNullOrEmpty()) {
Typeface.defaultFromStyle(targetStyle)
} else {
Typeface.create(genericFontFamily, targetStyle)
}
} else {
val familyTypeface = if (genericFontFamily == null) {
Typeface.DEFAULT
} else {
Typeface.create(genericFontFamily, Typeface.NORMAL)
}
TypefaceHelperMethodsApi28.create(
familyTypeface,
fontWeight.weight,
fontStyle == FontStyle.Italic
)
}
}
}