ComponentDialog.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.activity
import android.app.Dialog
import android.content.Context
import android.os.Bundle
import android.view.View
import android.view.ViewGroup
import androidx.annotation.CallSuper
import androidx.annotation.StyleRes
import androidx.lifecycle.Lifecycle
import androidx.lifecycle.LifecycleOwner
import androidx.lifecycle.LifecycleRegistry
import androidx.lifecycle.ViewTreeLifecycleOwner
/**
* Base class for dialogs that enables composition of higher level components.
*/
open class ComponentDialog @JvmOverloads constructor(
context: Context,
@StyleRes themeResId: Int = 0
) : Dialog(context, themeResId),
LifecycleOwner,
OnBackPressedDispatcherOwner {
private var _lifecycleRegistry: LifecycleRegistry? = null
private val lifecycleRegistry: LifecycleRegistry
get() = _lifecycleRegistry ?: LifecycleRegistry(this).also {
_lifecycleRegistry = it
}
final override fun getLifecycle(): Lifecycle = lifecycleRegistry
@CallSuper
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
lifecycleRegistry.handleLifecycleEvent(Lifecycle.Event.ON_CREATE)
}
@CallSuper
override fun onStart() {
super.onStart()
lifecycleRegistry.handleLifecycleEvent(Lifecycle.Event.ON_RESUME)
}
@CallSuper
override fun onStop() {
// This is the closest thing to onDestroy that a Dialog has
lifecycleRegistry.handleLifecycleEvent(Lifecycle.Event.ON_DESTROY)
_lifecycleRegistry = null
super.onStop()
}
private val onBackPressedDispatcher = OnBackPressedDispatcher {
super.onBackPressed()
}
final override fun getOnBackPressedDispatcher() = onBackPressedDispatcher
@CallSuper
override fun onBackPressed() {
onBackPressedDispatcher.onBackPressed()
}
override fun setContentView(layoutResID: Int) {
initViewTreeOwners()
super.setContentView(layoutResID)
}
override fun setContentView(view: View) {
initViewTreeOwners()
super.setContentView(view)
}
override fun setContentView(view: View, params: ViewGroup.LayoutParams?) {
initViewTreeOwners()
super.setContentView(view, params)
}
override fun addContentView(view: View, params: ViewGroup.LayoutParams?) {
initViewTreeOwners()
super.addContentView(view, params)
}
private fun initViewTreeOwners() {
ViewTreeLifecycleOwner.set(window!!.decorView, this)
window!!.decorView.setViewTreeOnBackPressedDispatcherOwner(this)
}
}