Added animation

app/src/main/java/eu/kanade/tachiyomi/ui/manga/chapter/ChaptersFragment.kt

@@ -1,5 +1,8 @@
 package eu.kanade.tachiyomi.ui.manga.chapter
 
+import android.animation.Animator
+import android.animation.AnimatorListenerAdapter
+import android.content.Intent
 import android.os.Bundle
 import android.support.v7.view.ActionMode
 import android.support.v7.widget.LinearLayoutManager
@@ -16,6 +19,7 @@ import eu.kanade.tachiyomi.ui.base.decoration.DividerItemDecoration
 import eu.kanade.tachiyomi.ui.base.fragment.BaseRxFragment
 import eu.kanade.tachiyomi.ui.manga.MangaActivity
 import eu.kanade.tachiyomi.ui.reader.ReaderActivity
+import eu.kanade.tachiyomi.util.getCoordinates
 import eu.kanade.tachiyomi.util.getResourceDrawable
 import eu.kanade.tachiyomi.util.toast
 import kotlinx.android.synthetic.main.fragment_manga_chapters.*
@@ -73,7 +77,19 @@ class ChaptersFragment : BaseRxFragment<ChaptersPresenter>(), ActionMode.Callbac
         fab.setOnClickListener { v ->
             val chapter = presenter.getNextUnreadChapter()
             if (chapter != null) {
-                openChapter(chapter)
+                // Create animation listener
+                var revealAnimationListener: Animator.AnimatorListener = object : AnimatorListenerAdapter() {
+                    override fun onAnimationEnd(animation: Animator) {
+                        // On done open chapter
+                        openChapter(chapter, true)
+                    }
+                }
+
+                // Get coordinates and start animation
+                val coordinates = fab.getCoordinates()
+                if (!reveal_view.showRevealEffect(coordinates.x, coordinates.y, revealAnimationListener)) {
+                    openChapter(chapter)
+                }
             } else {
                 context.toast(R.string.no_next_chapter)
             }
@@ -90,6 +106,16 @@ class ChaptersFragment : BaseRxFragment<ChaptersPresenter>(), ActionMode.Callbac
         super.onPause()
     }
 
+    override fun onResume() {
+        // Check if animation view is visible
+        if (reveal_view.visibility == View.VISIBLE) {
+            // Show the unReveal effect
+            var coordinates = fab.getCoordinates()
+            reveal_view.hideRevealEffect(coordinates.x, coordinates.y, 1920)
+        }
+        super.onResume()
+    }
+
     override fun onCreateOptionsMenu(menu: Menu, inflater: MenuInflater) {
         inflater.inflate(R.menu.chapters, menu)
         menu.findItem(R.id.action_filter_unread).isChecked = presenter.onlyUnread()
@@ -159,9 +185,12 @@ class ChaptersFragment : BaseRxFragment<ChaptersPresenter>(), ActionMode.Callbac
     val isCatalogueManga: Boolean
         get() = (activity as MangaActivity).isCatalogueManga
 
-    protected fun openChapter(chapter: Chapter) {
+    protected fun openChapter(chapter: Chapter, hasAnimation: Boolean = false) {
         presenter.onOpenChapter(chapter)
         val intent = ReaderActivity.newIntent(activity)
+        if (hasAnimation) {
+            intent.addFlags(Intent.FLAG_ACTIVITY_NO_ANIMATION)
+        }
         startActivity(intent)
     }
 
@@ -349,5 +378,4 @@ class ChaptersFragment : BaseRxFragment<ChaptersPresenter>(), ActionMode.Callbac
     fun setDownloadedFilter() {
         this.activity.supportInvalidateOptionsMenu()
     }
-
 }

app/src/main/java/eu/kanade/tachiyomi/util/ViewExtensions.kt

@@ -0,0 +1,19 @@
+package eu.kanade.tachiyomi.util
+
+import android.graphics.Point
+import android.view.View
+
+/**
+ * Returns coordinates of view.
+ * Used for animation
+ *
+ * @return coordinates of view
+ */
+fun View.getCoordinates(): Point
+{
+    var cx = (this.left + this.right) / 2;
+    var cy = (this.top + this.bottom) / 2;
+
+    return Point(cx, cy)
+}
+

app/src/main/java/eu/kanade/tachiyomi/widget/RevealAnimationView.kt

@@ -0,0 +1,79 @@
+package eu.kanade.tachiyomi.widget
+
+import android.animation.Animator
+import android.animation.AnimatorListenerAdapter
+import android.annotation.TargetApi
+import android.content.Context
+import android.os.Build
+import android.util.AttributeSet
+import android.view.View
+import android.view.ViewAnimationUtils
+
+@TargetApi(Build.VERSION_CODES.LOLLIPOP)
+class RevealAnimationView @JvmOverloads constructor(context: Context, attrs: AttributeSet? = null) :
+        View(context, attrs) {
+
+    /**
+     * Hides the animation view with a animation
+     *
+     * @param centerX x starting point
+     * @param centerY y starting point
+     * @param initialRadius size of radius of animation
+     */
+    fun hideRevealEffect(centerX: Int, centerY: Int, initialRadius: Int) {
+        if (Build.VERSION.SDK_INT >= 21) {
+
+            // Make the view visible.
+            this.visibility = View.VISIBLE
+
+            // Create the animation (the final radius is zero).
+            val anim = ViewAnimationUtils.createCircularReveal(
+                    this, centerX, centerY, initialRadius.toFloat(), 0f)
+
+            // Set duration of animation.
+            anim.duration = 500
+
+            // make the view invisible when the animation is done
+            anim.addListener(object : AnimatorListenerAdapter() {
+                override fun onAnimationEnd(animation: Animator) {
+                    super.onAnimationEnd(animation)
+                    this@RevealAnimationView.visibility = View.INVISIBLE
+                }
+            })
+
+            anim.start()
+        }
+    }
+
+    /**
+     * Fills the animation view with a animation
+     *
+     * @param centerX x starting point
+     * @param centerY y starting point
+     * @param listener animation listener
+     *
+     * @return sdk version lower then 21
+     */
+    fun showRevealEffect(centerX: Int, centerY: Int, listener: Animator.AnimatorListener): Boolean {
+        if (Build.VERSION.SDK_INT >= 21) {
+
+            this.visibility = View.VISIBLE
+
+            val height = this.height
+
+            // Create animation
+            val anim = ViewAnimationUtils.createCircularReveal(
+                    this, centerX, centerY, 0f, height.toFloat())
+
+            // Set duration of animation
+            anim.duration = 350
+
+            anim.addListener(listener)
+            anim.start()
+            return true
+        }
+        return false
+    }
+
+
+}