Add CLEAR and FILTER buttons to notifications (#1168)

* Issue tuskyapp#762 add clear notifications button to the top of the Notifications adapter

* Issue tuskyapp#764 add the notifications filter

* Update notifications top bar buttons

* Replace PopupMenu with PopupWindow. Save notifications filter to the account table

* Disable hide top bar on empty content at the notification screen

* Add app bar behavior to the sw640 notification layout

* Fix issue with click on top notification tab

app/src/main/java/com/keylesspalace/tusky/util/AppBarLayoutNoEmptyScrollBehavior.kt

@@ -0,0 +1,74 @@
+/* Copyright 2019 Joel Pyska
+ *
+ * This file is a part of Tusky.
+ *
+ * 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.
+ *
+ * Tusky 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 Tusky; if not,
+ * see <http://www.gnu.org/licenses>. */
+
+package com.keylesspalace.tusky.util
+
+import android.content.Context
+import android.util.AttributeSet
+import android.view.MotionEvent
+import com.google.android.material.appbar.AppBarLayout
+import androidx.coordinatorlayout.widget.CoordinatorLayout
+import android.view.View
+import android.view.ViewGroup
+import androidx.recyclerview.widget.RecyclerView
+
+
+/**
+ * Disable AppBar scroll if content view empty or don't need to scroll
+ */
+class AppBarLayoutNoEmptyScrollBehavior : AppBarLayout.Behavior {
+
+    constructor() : super()
+
+    constructor (context: Context, attrs: AttributeSet) : super(context, attrs)
+
+    private fun isRecyclerViewScrollable(appBar: AppBarLayout, recyclerView: RecyclerView?): Boolean {
+        if (recyclerView == null)
+            return false
+        var recyclerViewHeight = recyclerView.height // Height includes RecyclerView plus AppBarLayout at same level
+        val appCompatHeight = appBar.height
+        recyclerViewHeight -= appCompatHeight
+
+        return recyclerView.computeVerticalScrollRange() > recyclerViewHeight
+    }
+
+    override fun onStartNestedScroll(parent: CoordinatorLayout, child: AppBarLayout, directTargetChild: View, target: View, nestedScrollAxes: Int, type: Int): Boolean {
+        return if (isRecyclerViewScrollable(child, getRecyclerView(parent))) {
+            super.onStartNestedScroll(parent, child, directTargetChild, target, nestedScrollAxes, type)
+        } else false
+    }
+
+    override fun onTouchEvent(parent: CoordinatorLayout, child: AppBarLayout, ev: MotionEvent): Boolean {
+        //Prevent scroll on app bar drag
+        return if (child.isShown && !isRecyclerViewScrollable(child, getRecyclerView(parent)))
+            true
+        else
+            super.onTouchEvent(parent, child, ev)
+    }
+
+    private fun getRecyclerView(parent: ViewGroup): RecyclerView? {
+        for (i in 0 until parent.childCount) {
+            val child = parent.getChildAt(i)
+            if (child is RecyclerView)
+                return child
+            else if (child is ViewGroup) {
+                val childRecyclerView = getRecyclerView(child)
+                if (childRecyclerView is RecyclerView)
+                    return childRecyclerView
+            }
+        }
+        return null
+    }
+}

app/src/main/java/com/keylesspalace/tusky/util/NotificationTypeConverter.kt

@@ -0,0 +1,45 @@
+/* Copyright 2019 Joel Pyska
+ *
+ * This file is a part of Tusky.
+ *
+ * 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.
+ *
+ * Tusky 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 Tusky; if not,
+ * see <http://www.gnu.org/licenses>. */
+
+package com.keylesspalace.tusky.util
+
+import com.keylesspalace.tusky.entity.Notification
+import org.json.JSONArray
+
+/**
+ * Serialize to string array and deserialize notifications type
+ */
+
+fun serialize(data: Set<Notification.Type>?): String {
+    val array = JSONArray()
+    data?.forEach {
+        array.put(it.presentation)
+    }
+    return array.toString()
+}
+
+fun deserialize(data: String?): Set<Notification.Type> {
+    val ret = HashSet<Notification.Type>()
+    data?.let {
+        val array = JSONArray(data)
+        for (i in 0..(array.length() - 1)) {
+            val item = array.getString(i)
+            val type = Notification.Type.byString(item)
+            if (type != Notification.Type.UNKNOWN)
+                ret.add(type)
+        }
+    }
+    return ret
+}