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add predictive back androidx transition animation (#109)
* add predictive back androidx transition animation * apply only a ChangeBounds when back gesture is cancelled for the predictive back androidx transitions sample * add lifecycle owner to OnBackPressedCallback * Predictive Back : AndroidX Transitions. Ack feedback.
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123 changes: 123 additions & 0 deletions
123
...rface/predictiveback/src/main/java/com/example/platform/ui/predictiveback/PBTransition.kt
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| Original file line number | Diff line number | Diff line change |
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| @@ -0,0 +1,123 @@ | ||
| /* | ||
| * Copyright 2023 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 | ||
| * | ||
| * https://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. | ||
| */ | ||
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| package com.example.platform.ui.predictiveback | ||
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| import android.os.Bundle | ||
| import android.text.method.ScrollingMovementMethod | ||
| import androidx.fragment.app.Fragment | ||
| import android.view.LayoutInflater | ||
| import android.view.View | ||
| import android.view.ViewGroup | ||
| import androidx.activity.BackEventCompat | ||
| import androidx.activity.OnBackPressedCallback | ||
| import androidx.core.view.isVisible | ||
| import androidx.transition.ChangeBounds | ||
| import androidx.transition.Fade | ||
| import androidx.transition.TransitionManager | ||
| import androidx.transition.TransitionSeekController | ||
| import androidx.transition.TransitionSet | ||
| import com.example.platform.ui.predictiveback.databinding.FragmentTransitionBinding | ||
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| class PBTransition : Fragment() { | ||
| private var _binding: FragmentTransitionBinding? = null | ||
| private val binding get() = _binding!! | ||
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| val transitionSet = TransitionSet().apply { | ||
| addTransition(Fade(Fade.MODE_OUT)) | ||
| addTransition(ChangeBounds()) | ||
| addTransition(Fade(Fade.MODE_IN)) | ||
| } | ||
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| override fun onCreateView( | ||
| inflater: LayoutInflater, container: ViewGroup?, | ||
| savedInstanceState: Bundle?, | ||
| ): View { | ||
| _binding = FragmentTransitionBinding | ||
| .inflate(inflater, container, false) | ||
| return binding.root | ||
| } | ||
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| override fun onViewCreated(view: View, savedInstanceState: Bundle?) { | ||
| super.onViewCreated(view, savedInstanceState) | ||
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| changeTextVisibility(ShowText.SHORT) | ||
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| val callback = object : OnBackPressedCallback(enabled = false) { | ||
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| var controller: TransitionSeekController? = null | ||
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| override fun handleOnBackStarted(backEvent: BackEventCompat) { | ||
| controller = TransitionManager.controlDelayedTransition( | ||
| binding.textContainer, | ||
| transitionSet | ||
| ) | ||
| changeTextVisibility(ShowText.SHORT) | ||
| } | ||
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| override fun handleOnBackProgressed(backEvent: BackEventCompat) { | ||
| if (controller?.isReady == true) { | ||
| controller?.currentFraction = backEvent.progress | ||
| } | ||
| } | ||
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| override fun handleOnBackPressed() { | ||
| controller?.animateToEnd() | ||
| this.isEnabled = false | ||
| } | ||
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| override fun handleOnBackCancelled() { | ||
| // If the user cancels the back gesture, reset the state | ||
| TransitionManager.beginDelayedTransition( | ||
| binding.textContainer, | ||
| ChangeBounds() | ||
| ) | ||
| changeTextVisibility(ShowText.LONG) | ||
| } | ||
| } | ||
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| binding.shortText.setOnClickListener { | ||
| TransitionManager.beginDelayedTransition(binding.textContainer, transitionSet) | ||
| changeTextVisibility(ShowText.LONG) | ||
| callback.isEnabled = true | ||
| } | ||
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| this.requireActivity().onBackPressedDispatcher.addCallback(viewLifecycleOwner, callback) | ||
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| binding.longText.movementMethod = ScrollingMovementMethod() | ||
| } | ||
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| override fun onDestroyView() { | ||
| super.onDestroyView() | ||
| _binding = null | ||
| } | ||
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| enum class ShowText { SHORT, LONG } | ||
| private fun changeTextVisibility(showText: ShowText) { | ||
| when (showText) { | ||
| ShowText.SHORT -> { | ||
| binding.shortText.isVisible = true | ||
| binding.longText.isVisible = false | ||
| binding.body.text = "Click on the box." | ||
| } | ||
| ShowText.LONG -> { | ||
| binding.shortText.isVisible = false | ||
| binding.longText.isVisible = true | ||
| binding.body.text = "Swipe back slowly to see the Predictive Back AndroidX Transition." | ||
| } | ||
| } | ||
| } | ||
| } |
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