ModifiedFocusRequesterNode.kt
/*
* Copyright 2020 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.node
import androidx.compose.ui.focus.FocusRequester
import androidx.compose.ui.focus.FocusRequesterModifier
import androidx.compose.ui.focus.searchChildrenForFocusNode
internal class ModifiedFocusRequesterNode(
wrapped: LayoutNodeWrapper,
modifier: FocusRequesterModifier
) : DelegatingLayoutNodeWrapper<FocusRequesterModifier>(wrapped, modifier) {
private var focusRequester: FocusRequester? = null
set(value) {
// Check if this focus requester node is associated with another focusRequester.
field?.focusRequesterNodes?.remove(this)
field = value
field?.focusRequesterNodes?.add(this)
}
// Searches for the focus node associated with this focus requester node.
internal fun findFocusNode(): ModifiedFocusNode? {
return findNextFocusWrapper() ?: layoutNode.searchChildrenForFocusNode()
}
override fun onModifierChanged() {
super.onModifierChanged()
focusRequester = modifier.focusRequester
}
override fun attach() {
super.attach()
focusRequester = modifier.focusRequester
}
override fun detach() {
focusRequester = null
super.detach()
}
}