WindowBackend.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.window.layout.adapter
import android.app.Activity
import android.content.Context
import androidx.annotation.RestrictTo
import androidx.annotation.UiContext
import androidx.core.util.Consumer
import androidx.window.layout.WindowLayoutInfo
import java.util.concurrent.Executor
/**
* Backing interface for [androidx.window.layout.WindowInfoTracker] instances that serve as the
* default information supplier.
*/
internal interface WindowBackend {
/**
* Registers a callback for layout changes of the window for the supplied [UiContext].
* Must be called only after the it is attached to the window.
* The supplied [UiContext] should correspond to a window or an area on the screen. It must be
* either an [Activity] or a [UiContext] created with [Context#createWindowContext].
*/
fun registerLayoutChangeCallback(
@UiContext context: Context,
executor: Executor,
callback: Consumer<WindowLayoutInfo>
)
/**
* Unregisters a callback for window layout changes.
*/
fun unregisterLayoutChangeCallback(callback: Consumer<WindowLayoutInfo>)
@RestrictTo(RestrictTo.Scope.LIBRARY)
fun hasRegisteredListeners(): Boolean {
return false
}
}