318 lines
12 KiB
Kotlin
318 lines
12 KiB
Kotlin
/* Copyright 2017 Andrew Dawson
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*
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* This file is a part of Tusky.
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*
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* This program is free software; you can redistribute it and/or modify it under the terms of the
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* GNU General Public License as published by the Free Software Foundation; either version 3 of the
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* License, or (at your option) any later version.
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*
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* Tusky is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even
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* the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General
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* Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along with Tusky; if not,
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* see <http://www.gnu.org/licenses>. */
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package com.keylesspalace.tusky.fragment
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import android.animation.Animator
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import android.animation.AnimatorListenerAdapter
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import android.annotation.SuppressLint
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import android.content.Context
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import android.graphics.drawable.Drawable
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import android.os.Bundle
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import android.view.LayoutInflater
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import android.view.MotionEvent
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import android.view.View
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import android.view.ViewGroup
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import android.widget.ImageView
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import com.bumptech.glide.Glide
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import com.bumptech.glide.load.DataSource
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import com.bumptech.glide.load.engine.GlideException
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import com.bumptech.glide.request.RequestListener
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import com.bumptech.glide.request.target.Target
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import com.github.chrisbanes.photoview.PhotoViewAttacher
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import com.keylesspalace.tusky.ViewMediaActivity
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import com.keylesspalace.tusky.databinding.FragmentViewImageBinding
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import com.keylesspalace.tusky.entity.Attachment
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import com.keylesspalace.tusky.util.hide
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import com.keylesspalace.tusky.util.parcelable
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import com.keylesspalace.tusky.util.visible
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import io.reactivex.rxjava3.subjects.BehaviorSubject
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import kotlin.math.abs
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class ViewImageFragment : ViewMediaFragment() {
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interface PhotoActionsListener {
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fun onBringUp()
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fun onDismiss()
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fun onPhotoTap()
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}
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private var _binding: FragmentViewImageBinding? = null
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private val binding get() = _binding!!
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private lateinit var attacher: PhotoViewAttacher
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private lateinit var photoActionsListener: PhotoActionsListener
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private lateinit var toolbar: View
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private var transition = BehaviorSubject.create<Unit>()
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private var shouldStartTransition = false
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// Volatile: Image requests happen on background thread and we want to see updates to it
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// immediately on another thread. Atomic is an overkill for such thing.
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@Volatile
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private var startedTransition = false
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override fun onAttach(context: Context) {
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super.onAttach(context)
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photoActionsListener = context as PhotoActionsListener
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}
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override fun setupMediaView(
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url: String,
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previewUrl: String?,
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description: String?,
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showingDescription: Boolean
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) {
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binding.photoView.transitionName = url
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binding.mediaDescription.text = description
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binding.captionSheet.visible(showingDescription)
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startedTransition = false
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loadImageFromNetwork(url, previewUrl, binding.photoView)
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}
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override fun onCreateView(inflater: LayoutInflater, container: ViewGroup?, savedInstanceState: Bundle?): View {
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toolbar = (requireActivity() as ViewMediaActivity).toolbar
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this.transition = BehaviorSubject.create()
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_binding = FragmentViewImageBinding.inflate(inflater, container, false)
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return binding.root
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}
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@SuppressLint("ClickableViewAccessibility")
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override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
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super.onViewCreated(view, savedInstanceState)
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val arguments = this.requireArguments()
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val attachment: Attachment? = arguments.parcelable(ARG_ATTACHMENT)
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this.shouldStartTransition = arguments.getBoolean(ARG_START_POSTPONED_TRANSITION)
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val url: String?
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var description: String? = null
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if (attachment != null) {
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url = attachment.url
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description = attachment.description
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} else {
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url = arguments.getString(ARG_SINGLE_IMAGE_URL)
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if (url == null) {
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throw IllegalArgumentException("attachment or image url has to be set")
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}
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}
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attacher = PhotoViewAttacher(binding.photoView).apply {
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// This prevents conflicts with ViewPager
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setAllowParentInterceptOnEdge(true)
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// Clicking outside the photo closes the viewer.
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setOnOutsidePhotoTapListener { photoActionsListener.onDismiss() }
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setOnClickListener { onMediaTap() }
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/* A vertical swipe motion also closes the viewer. This is especially useful when the photo
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* mostly fills the screen so clicking outside is difficult. */
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setOnSingleFlingListener { _, _, velocityX, velocityY ->
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var result = false
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if (abs(velocityY) > abs(velocityX)) {
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photoActionsListener.onDismiss()
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result = true
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}
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result
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}
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}
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var lastY = 0f
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binding.photoView.setOnTouchListener { v, event ->
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// This part is for scaling/translating on vertical move.
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// We use raw coordinates to get the correct ones during scaling
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if (event.action == MotionEvent.ACTION_DOWN) {
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lastY = event.rawY
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} else if (event.pointerCount == 1 &&
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attacher.scale == 1f &&
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event.action == MotionEvent.ACTION_MOVE
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) {
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val diff = event.rawY - lastY
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// This code is to prevent transformations during page scrolling
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// If we are already translating or we reached the threshold, then transform.
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if (binding.photoView.translationY != 0f || abs(diff) > 40) {
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binding.photoView.translationY += (diff)
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val scale = (-abs(binding.photoView.translationY) / 720 + 1).coerceAtLeast(0.5f)
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binding.photoView.scaleY = scale
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binding.photoView.scaleX = scale
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lastY = event.rawY
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return@setOnTouchListener true
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}
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} else if (event.action == MotionEvent.ACTION_UP || event.action == MotionEvent.ACTION_CANCEL) {
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onGestureEnd()
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}
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attacher.onTouch(v, event)
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}
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finalizeViewSetup(url, attachment?.previewUrl, description)
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}
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private fun onGestureEnd() {
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if (_binding == null) {
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return
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}
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if (abs(binding.photoView.translationY) > 180) {
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photoActionsListener.onDismiss()
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} else {
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binding.photoView.animate().translationY(0f).scaleX(1f).scaleY(1f).start()
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}
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}
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private fun onMediaTap() {
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photoActionsListener.onPhotoTap()
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}
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override fun onToolbarVisibilityChange(visible: Boolean) {
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if (_binding == null || !userVisibleHint) {
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return
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}
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isDescriptionVisible = showingDescription && visible
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val alpha = if (isDescriptionVisible) 1.0f else 0.0f
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binding.captionSheet.animate().alpha(alpha)
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.setListener(object : AnimatorListenerAdapter() {
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override fun onAnimationEnd(animation: Animator) {
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if (_binding != null) {
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binding.captionSheet.visible(isDescriptionVisible)
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}
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animation.removeListener(this)
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}
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})
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.start()
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}
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override fun onDestroyView() {
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Glide.with(this).clear(binding.photoView)
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transition.onComplete()
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_binding = null
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super.onDestroyView()
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}
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private fun loadImageFromNetwork(url: String, previewUrl: String?, photoView: ImageView) {
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val glide = Glide.with(this)
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// Request image from the any cache
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glide
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.load(url)
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.dontAnimate()
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.onlyRetrieveFromCache(true)
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.let {
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if (previewUrl != null)
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it.thumbnail(
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glide
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.load(previewUrl)
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.dontAnimate()
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.onlyRetrieveFromCache(true)
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.centerInside()
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.addListener(ImageRequestListener(true, isThumbnailRequest = true))
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)
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else it
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}
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// Request image from the network on fail load image from cache
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.error(
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glide.load(url)
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.centerInside()
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.addListener(ImageRequestListener(false, isThumbnailRequest = false))
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)
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.centerInside()
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.addListener(ImageRequestListener(true, isThumbnailRequest = false))
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.into(photoView)
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}
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/**
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* We start transition as soon as we think reasonable but we must take care about couple of
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* things>
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* - Do not change image in the middle of transition. It messes up the view.
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* - Do not transition for the views which don't require it. Starting transition from
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* multiple fragments does weird things
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* - Do not wait to transition until the image loads from network
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*
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* Preview, cached image, network image, x - failed, o - succeeded
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* P C N - start transition after...
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* x x x - the cache fails
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* x x o - the cache fails
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* x o o - the cache succeeds
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* o x o - the preview succeeds. Do not start on cache.
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* o o o - the preview succeeds. Do not start on cache.
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*
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* So start transition after the first success or after anything with the cache
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*
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* @param isCacheRequest - is this listener for request image from cache or from the network
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*/
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private inner class ImageRequestListener(
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private val isCacheRequest: Boolean,
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private val isThumbnailRequest: Boolean
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) : RequestListener<Drawable> {
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override fun onLoadFailed(
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e: GlideException?,
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model: Any,
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target: Target<Drawable>,
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isFirstResource: Boolean
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): Boolean {
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// If cache for full image failed complete transition
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if (isCacheRequest && !isThumbnailRequest && shouldStartTransition &&
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!startedTransition
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) {
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photoActionsListener.onBringUp()
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}
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// Hide progress bar only on fail request from internet
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if (!isCacheRequest && _binding != null) binding.progressBar.hide()
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// We don't want to overwrite preview with null when main image fails to load
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return !isCacheRequest
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}
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@SuppressLint("CheckResult")
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override fun onResourceReady(
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resource: Drawable,
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model: Any,
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target: Target<Drawable>,
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dataSource: DataSource,
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isFirstResource: Boolean
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): Boolean {
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if (_binding != null) {
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binding.progressBar.hide() // Always hide the progress bar on success
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}
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if (!startedTransition || !shouldStartTransition) {
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// Set this right away so that we don't have to concurrent post() requests
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startedTransition = true
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// post() because load() replaces image with null. Sometimes after we set
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// the thumbnail.
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binding.photoView.post {
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target.onResourceReady(resource, null)
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if (shouldStartTransition) photoActionsListener.onBringUp()
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}
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} else {
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// This wait for transition. If there's no transition then we should hit
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// another branch. take() will unsubscribe after we have it to not leak memory
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transition
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.take(1)
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.subscribe {
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target.onResourceReady(resource, null)
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// It's needed. Don't ask why, I don't know, setImageDrawable() should
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// do it by itself but somehow it doesn't work automatically.
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// Just do it. If you don't, image will jump around when touched.
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attacher.update()
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}
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}
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return true
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}
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}
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override fun onTransitionEnd() {
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this.transition.onNext(Unit)
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}
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}
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