DeadKeyCombiner.android.kt
/*
* Copyright 2022 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.foundation.text
import android.view.KeyCharacterMap
import androidx.compose.ui.input.key.KeyEvent
import androidx.compose.ui.input.key.utf16CodePoint
internal actual class DeadKeyCombiner {
private var deadKeyCode: Int? = null
actual fun consume(event: KeyEvent): Int? {
val codePoint = event.utf16CodePoint
if (codePoint and KeyCharacterMap.COMBINING_ACCENT != 0) {
deadKeyCode = codePoint and KeyCharacterMap.COMBINING_ACCENT_MASK
return null
}
val localDeadKeyCode = deadKeyCode
if (localDeadKeyCode != null) {
deadKeyCode = null
return KeyCharacterMap.getDeadChar(localDeadKeyCode, codePoint)
// if the combo doesn't exist, fall back to the current key press
.takeUnless { it == 0 } ?: codePoint
}
return codePoint
}
}