SelectionManager.android.kt
/*
* 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.foundation.text.selection
import android.annotation.SuppressLint
import androidx.compose.foundation.ExperimentalFoundationApi
import androidx.compose.foundation.MagnifierStyle
import androidx.compose.foundation.magnifier
import androidx.compose.runtime.getValue
import androidx.compose.runtime.mutableStateOf
import androidx.compose.runtime.remember
import androidx.compose.runtime.setValue
import androidx.compose.ui.Modifier
import androidx.compose.ui.composed
import androidx.compose.ui.input.key.KeyEvent
import androidx.compose.ui.platform.LocalDensity
import androidx.compose.ui.unit.IntSize
// TODO(b/139322105) Implement for Android when hardware keyboard is implemented
internal actual fun isCopyKeyEvent(keyEvent: KeyEvent) = false
// We use composed{} to read a local, but don't provide inspector info because the underlying
// magnifier modifier provides more meaningful inspector info.
@SuppressLint("ModifierInspectorInfo")
@OptIn(ExperimentalFoundationApi::class)
internal actual fun Modifier.selectionMagnifier(manager: SelectionManager): Modifier {
// Avoid tracking animation state on older Android versions that don't support magnifiers.
if (!MagnifierStyle.TextDefault.isSupported) {
return this
}
return composed {
val density = LocalDensity.current
var magnifierSize by remember { mutableStateOf(IntSize.Zero) }
animatedSelectionMagnifier(
magnifierCenter = {
calculateSelectionMagnifierCenterAndroid(manager, magnifierSize)
},
platformMagnifier = { center ->
Modifier
.magnifier(
sourceCenter = { center() },
onSizeChanged = { size ->
magnifierSize = with(density) {
IntSize(size.width.roundToPx(), size.height.roundToPx())
}
},
style = MagnifierStyle.TextDefault
)
}
)
}
}