From da110b8fc0e181b53012cae537157da3746859d4 Mon Sep 17 00:00:00 2001 From: Ivan Kupalov Date: Mon, 22 Jun 2020 21:26:37 +0200 Subject: [PATCH] Improve image viewer (#1843) This commit does 3 things: 1. Replaces PhotoView (which is abandonware) with modern TouchImageView 2. Fixes an issue with panning images. Gesture was not intercepted properly and pager was taking control instead of image being moved. 3. Adds feedback to dismissing of images with vertical gesture. --- app/build.gradle | 2 +- .../compose/dialog/CaptionDialog.kt | 7 +- .../tusky/fragment/ViewImageFragment.kt | 100 ++++++++++++------ .../main/res/layout/fragment_view_image.xml | 3 +- 4 files changed, 73 insertions(+), 39 deletions(-) diff --git a/app/build.gradle b/app/build.gradle index 80847c22..59100802 100644 --- a/app/build.gradle +++ b/app/build.gradle @@ -178,7 +178,7 @@ dependencies { implementation "com.github.connyduck:sparkbutton:4.0.0" - implementation "com.github.chrisbanes:PhotoView:2.3.0" + implementation 'com.github.MikeOrtiz:TouchImageView:3.0.1' implementation "com.mikepenz:materialdrawer:$materialdrawerVersion" implementation "com.mikepenz:materialdrawer-iconics:$materialdrawerVersion" diff --git a/app/src/main/java/com/keylesspalace/tusky/components/compose/dialog/CaptionDialog.kt b/app/src/main/java/com/keylesspalace/tusky/components/compose/dialog/CaptionDialog.kt index f10fb444..a768df09 100644 --- a/app/src/main/java/com/keylesspalace/tusky/components/compose/dialog/CaptionDialog.kt +++ b/app/src/main/java/com/keylesspalace/tusky/components/compose/dialog/CaptionDialog.kt @@ -33,9 +33,9 @@ import at.connyduck.sparkbutton.helpers.Utils import com.bumptech.glide.Glide import com.bumptech.glide.request.target.CustomTarget import com.bumptech.glide.request.transition.Transition -import com.github.chrisbanes.photoview.PhotoView import com.keylesspalace.tusky.R import com.keylesspalace.tusky.util.withLifecycleContext +import com.ortiz.touchview.TouchImageView // https://github.com/tootsuite/mastodon/blob/1656663/app/models/media_attachment.rb#L94 private const val MEDIA_DESCRIPTION_CHARACTER_LIMIT = 420 @@ -50,9 +50,8 @@ fun T.makeCaptionDialog(existingDescription: String?, dialogLayout.setPadding(padding, padding, padding, padding) dialogLayout.orientation = LinearLayout.VERTICAL - val imageView = PhotoView(this).apply { - // If it seems a lot, try opening an image of A4 format or similar - maximumScale = 6.0f + val imageView = TouchImageView(this).apply { + maxZoom = 6f } val displayMetrics = DisplayMetrics() diff --git a/app/src/main/java/com/keylesspalace/tusky/fragment/ViewImageFragment.kt b/app/src/main/java/com/keylesspalace/tusky/fragment/ViewImageFragment.kt index 1c367251..24a6a46c 100644 --- a/app/src/main/java/com/keylesspalace/tusky/fragment/ViewImageFragment.kt +++ b/app/src/main/java/com/keylesspalace/tusky/fragment/ViewImageFragment.kt @@ -21,9 +21,7 @@ import android.annotation.SuppressLint import android.content.Context import android.graphics.drawable.Drawable import android.os.Bundle -import android.view.LayoutInflater -import android.view.View -import android.view.ViewGroup +import android.view.* import android.widget.ImageView import android.widget.TextView import com.bumptech.glide.Glide @@ -31,7 +29,6 @@ import com.bumptech.glide.load.DataSource import com.bumptech.glide.load.engine.GlideException import com.bumptech.glide.request.RequestListener import com.bumptech.glide.request.target.Target -import com.github.chrisbanes.photoview.PhotoViewAttacher import com.keylesspalace.tusky.R import com.keylesspalace.tusky.entity.Attachment import com.keylesspalace.tusky.util.hide @@ -48,11 +45,11 @@ class ViewImageFragment : ViewMediaFragment() { fun onPhotoTap() } - private lateinit var attacher: PhotoViewAttacher private lateinit var photoActionsListener: PhotoActionsListener private lateinit var toolbar: View private var transition = BehaviorSubject.create() private var shouldStartTransition = false + // Volatile: Image requests happen on background thread and we want to see updates to it // immediately on another thread. Atomic is an overkill for such thing. @Volatile @@ -67,23 +64,6 @@ class ViewImageFragment : ViewMediaFragment() { override fun setupMediaView(url: String, previewUrl: String?) { descriptionView = mediaDescription photoView.transitionName = url - attacher = PhotoViewAttacher(photoView).apply { - // Clicking outside the photo closes the viewer. - setOnOutsidePhotoTapListener { photoActionsListener.onDismiss() } - setOnClickListener { onMediaTap() } - - /* A vertical swipe motion also closes the viewer. This is especially useful when the photo - * mostly fills the screen so clicking outside is difficult. */ - setOnSingleFlingListener { _, _, velocityX, velocityY -> - var result = false - if (abs(velocityY) > abs(velocityX)) { - photoActionsListener.onDismiss() - result = true - } - result - } - } - startedTransition = false loadImageFromNetwork(url, previewUrl, photoView) } @@ -94,10 +74,66 @@ class ViewImageFragment : ViewMediaFragment() { return inflater.inflate(R.layout.fragment_view_image, container, false) } + @SuppressLint("ClickableViewAccessibility") override fun onViewCreated(view: View, savedInstanceState: Bundle?) { super.onViewCreated(view, savedInstanceState) - val arguments = this.arguments!! + val gestureDetector = GestureDetector(requireContext(), object : GestureDetector.SimpleOnGestureListener() { + override fun onSingleTapConfirmed(e: MotionEvent?): Boolean { + onMediaTap() + return true + } + }) + + var lastY = 0f + photoView.setOnTouchListener { _, event -> + // This part is for scaling/translating on vertical move. + // We use raw coordinates to get the correct ones during scaling + var result = true + + gestureDetector.onTouchEvent(event) + + if (event.action == MotionEvent.ACTION_DOWN) { + lastY = event.rawY + } else if (!photoView.isZoomed && event.action == MotionEvent.ACTION_MOVE) { + val diff = event.rawY - lastY + // This code is to prevent transformations during page scrolling + // If we are already translating or we reached the threshold, then transform. + if (photoView.translationY != 0f || abs(diff) > 40) { + photoView.translationY += (diff) + val scale = (-abs(photoView.translationY) / 720 + 1).coerceAtLeast(0.5f) + photoView.scaleY = scale + photoView.scaleX = scale + lastY = event.rawY + } + return@setOnTouchListener true + } else if (event.action == MotionEvent.ACTION_UP || event.action == MotionEvent.ACTION_CANCEL) { + onGestureEnd() + } else if (event.pointerCount >= 2 || photoView.canScrollHorizontally(1) && photoView.canScrollHorizontally(-1)) { + // Starting from here is adapted code from TouchImageView to play nice with pager. + + // Can scroll horizontally checks if there's still a part of the image. + // That can be scrolled until you reach the edge multi-touch event. + val parent = view.parent + result = when (event.action) { + MotionEvent.ACTION_DOWN, MotionEvent.ACTION_MOVE -> { + // Disallow RecyclerView to intercept touch events. + parent.requestDisallowInterceptTouchEvent(true) + // Disable touch on view + false + } + MotionEvent.ACTION_UP -> { + // Allow RecyclerView to intercept touch events. + parent.requestDisallowInterceptTouchEvent(false) + true + } + else -> true + } + } + result + } + + val arguments = this.requireArguments() val attachment = arguments.getParcelable(ARG_ATTACHMENT) this.shouldStartTransition = arguments.getBoolean(ARG_START_POSTPONED_TRANSITION) val url: String? @@ -116,6 +152,14 @@ class ViewImageFragment : ViewMediaFragment() { finalizeViewSetup(url, attachment?.previewUrl, description) } + private fun onGestureEnd() { + if (abs(photoView.translationY) > 180) { + photoActionsListener.onDismiss() + } else { + photoView.animate().translationY(0f).scaleX(1f).scaleY(1f).start() + } + } + private fun onMediaTap() { photoActionsListener.onPhotoTap() } @@ -155,7 +199,6 @@ class ViewImageFragment : ViewMediaFragment() { .load(previewUrl) .dontAnimate() .onlyRetrieveFromCache(true) - .centerInside() .addListener(ImageRequestListener(true, isThumnailRequest = true))) else it } @@ -164,7 +207,6 @@ class ViewImageFragment : ViewMediaFragment() { .centerInside() .addListener(ImageRequestListener(false, isThumnailRequest = false)) ) - .centerInside() .addListener(ImageRequestListener(true, isThumnailRequest = false)) .into(photoView) } @@ -225,13 +267,7 @@ class ViewImageFragment : ViewMediaFragment() { // another branch. take() will unsubscribe after we have it to not leak menmory transition .take(1) - .subscribe { - target.onResourceReady(resource, null) - // It's needed. Don't ask why, I don't know, setImageDrawable() should - // do it by itself but somehow it doesn't work automatically. - // Just do it. If you don't, image will jump around when touched. - attacher.update() - } + .subscribe { target.onResourceReady(resource, null) } } return true } diff --git a/app/src/main/res/layout/fragment_view_image.xml b/app/src/main/res/layout/fragment_view_image.xml index faf1f806..1e3f442a 100644 --- a/app/src/main/res/layout/fragment_view_image.xml +++ b/app/src/main/res/layout/fragment_view_image.xml @@ -4,11 +4,10 @@ xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent" android:layout_height="match_parent" - android:layout_gravity="center" android:clickable="true" android:focusable="true"> -