43 lines
1.3 KiB
Kotlin
43 lines
1.3 KiB
Kotlin
/*
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* Copyright (c) 2023 New Vector Ltd
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package io.element.android.appnav
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import com.bumble.appyx.navmodel.backstack.BackStack
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import com.bumble.appyx.navmodel.backstack.operation.NewRoot
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import com.bumble.appyx.navmodel.backstack.operation.Remove
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/**
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* Don't process NewRoot if the nav target already exists in the stack.
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*/
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fun <T : Any> BackStack<T>.safeRoot(element: T) {
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val containsRoot = elements.value.any {
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it.key.navTarget == element
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}
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if (containsRoot) return
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accept(NewRoot(element))
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}
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/**
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* Remove the last element on the backstack equals to the given one.
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*/
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fun <T : Any> BackStack<T>.removeLast(element: T) {
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val lastExpectedNavElement = elements.value.lastOrNull {
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it.key.navTarget == element
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} ?: return
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accept(Remove(lastExpectedNavElement.key))
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}
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