Add animation for bottom bar during Snackbar transitions

Fix #1036 the one-year-old issue. There are still some subtle blackness during the exit animation. Unfortunately this is something I am not able to fix as I don't and probably won't ever have enough knowledge about Android's drawing passes. Anyway this still looks much better than before.
2017-12-29 20:58:02 +08:00
parent 0d0c2d59de
commit 0335d67dba
4 changed files with 259 additions and 75 deletions
@@ -0,0 +1,40 @@
+/*******************************************************************************
+ *                                                                             *
+ *  Copyright (C) 2017 by Max Lv <max.c.lv@gmail.com>                          *
+ *  Copyright (C) 2017 by Mygod Studio <contact-shadowsocks-android@mygod.be>  *
+ *                                                                             *
+ *  This program is free software: you can redistribute it and/or modify       *
+ *  it under the terms of the GNU General Public License as published by       *
+ *  the Free Software Foundation, either version 3 of the License, or          *
+ *  (at your option) any later version.                                        *
+ *                                                                             *
+ *  This program is distributed in the hope that it will be useful,            *
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of             *
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the              *
+ *  GNU General Public License for more details.                               *
+ *                                                                             *
+ *  You should have received a copy of the GNU General Public License          *
+ *  along with this program. If not, see <http://www.gnu.org/licenses/>.       *
+ *                                                                             *
+ *******************************************************************************/
+
+package com.github.shadowsocks.widget
+
+import android.content.Context
+import android.support.design.widget.CoordinatorLayout
+import android.util.AttributeSet
+import android.view.View
+import com.github.shadowsocks.R
+
+class BottomMarginBehavior : CoordinatorLayout.Behavior<View> {
+    constructor() : super()
+    constructor(context: Context, attrs: AttributeSet) : super(context, attrs)
+
+    override fun layoutDependsOn(parent: CoordinatorLayout, child: View, dependency: View): Boolean =
+            dependency.id == R.id.stat  // sorry I'm too lazy to write an attribute
+
+    override fun onDependentViewChanged(parent: CoordinatorLayout, child: View, dependency: View): Boolean {
+        (child.layoutParams as CoordinatorLayout.LayoutParams).bottomMargin = (parent.height - dependency.y).toInt()
+        return true
+    }
+}
@@ -0,0 +1,71 @@
+/*******************************************************************************
+ *                                                                             *
+ *  Copyright (C) 2017 by Max Lv <max.c.lv@gmail.com>                          *
+ *  Copyright (C) 2017 by Mygod Studio <contact-shadowsocks-android@mygod.be>  *
+ *                                                                             *
+ *  This program is free software: you can redistribute it and/or modify       *
+ *  it under the terms of the GNU General Public License as published by       *
+ *  the Free Software Foundation, either version 3 of the License, or          *
+ *  (at your option) any later version.                                        *
+ *                                                                             *
+ *  This program is distributed in the hope that it will be useful,            *
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of             *
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the              *
+ *  GNU General Public License for more details.                               *
+ *                                                                             *
+ *  You should have received a copy of the GNU General Public License          *
+ *  along with this program. If not, see <http://www.gnu.org/licenses/>.       *
+ *                                                                             *
+ *******************************************************************************/
+
+package com.github.shadowsocks.widget
+
+import android.animation.Animator
+import android.animation.AnimatorListenerAdapter
+import android.animation.ValueAnimator
+import android.content.Context
+import android.os.Build
+import android.support.design.widget.CoordinatorLayout
+import android.support.design.widget.SnackbarAnimation
+import android.support.design.widget.Snackbar
+import android.support.v4.view.ViewCompat
+import android.util.AttributeSet
+import android.view.View
+
+/**
+ * Full credits go to: https://stackoverflow.com/a/35904421/2245107
+ */
+class MoveUpwardBehavior : CoordinatorLayout.Behavior<View> {
+    constructor() : super()
+    constructor(context: Context, attrs: AttributeSet) : super(context, attrs)
+
+    override fun layoutDependsOn(parent: CoordinatorLayout, child: View, dependency: View): Boolean =
+            dependency is Snackbar.SnackbarLayout
+
+    override fun onDependentViewChanged(parent: CoordinatorLayout, child: View, dependency: View): Boolean {
+        child.translationY = Math.min(0f, dependency.translationY - dependency.height)
+        return true
+    }
+
+    /**
+     * Based on BaseTransientBottomBar.animateViewOut (support lib 27.0.2).
+     */
+    override fun onDependentViewRemoved(parent: CoordinatorLayout, child: View, dependency: View) {
+        val animator = ValueAnimator()
+        val start = child.translationY
+        animator.setFloatValues(start, 0f)
+        animator.interpolator = SnackbarAnimation.FAST_OUT_SLOW_IN_INTERPOLATOR
+        animator.duration = SnackbarAnimation.ANIMATION_DURATION
+        animator.addUpdateListener(object : ValueAnimator.AnimatorUpdateListener {
+            private var previousValue = start
+
+            override fun onAnimationUpdate(animator: ValueAnimator) {
+                val currentValue = animator.animatedValue as Float
+                if (Build.VERSION.SDK_INT > 19) child.translationY = currentValue
+                else ViewCompat.offsetTopAndBottom(child, (currentValue - previousValue).toInt())
+                previousValue = currentValue
+            }
+        })
+        animator.start()
+    }
+}