fix: empty list state visibility

app/src/main/java/com/owncloud/android/ui/EmptyRecyclerView.kt

@@ -0,0 +1,103 @@
+/*
+ * Nextcloud - Android Client
+ *
+ * SPDX-FileCopyrightText: 2025 Alper Ozturk <[email protected]>
+ * SPDX-FileCopyrightText: 2018 Tobias Kaminsky <[email protected]>
+ * SPDX-FileCopyrightText: 2018 Nextcloud GmbH
+ * SPDX-License-Identifier: AGPL-3.0-or-later OR GPL-2.0-only
+ */
+package com.owncloud.android.ui
+
+import android.content.Context
+import android.util.AttributeSet
+import android.view.View
+import androidx.recyclerview.widget.RecyclerView
+import com.nextcloud.utils.extensions.setVisibleIf
+import com.owncloud.android.lib.common.utils.Log_OC
+
+class EmptyRecyclerView @JvmOverloads constructor(context: Context, attrs: AttributeSet? = null, defStyle: Int = 0) :
+    RecyclerView(context, attrs, defStyle) {
+    companion object {
+        private const val TAG = "EmptyRecyclerView"
+    }
+
+    private var emptyView: View? = null
+    private var hasFooter = false
+    private var previousVisibilityState: Boolean? = null
+
+    override fun setAdapter(adapter: Adapter<*>?) {
+        this.adapter?.unregisterAdapterDataObserver(observer)
+        super.setAdapter(adapter)
+        adapter?.registerAdapterDataObserver(observer)
+        previousVisibilityState = null
+        configureEmptyView()
+    }
+
+    fun setEmptyView(view: View?) {
+        emptyView = view
+    }
+
+    @Suppress("ReturnCount")
+    private fun configureEmptyView() {
+        val view = emptyView ?: run {
+            Log_OC.e(TAG, "cannot configure empty view, view is null")
+            return
+        }
+
+        val recyclerViewAdapter = adapter ?: run {
+            Log_OC.e(TAG, "cannot configure empty view, recyclerViewAdapter is null")
+            return
+        }
+
+        val emptyCount = if (hasFooter) 1 else 0
+        val empty = (recyclerViewAdapter.itemCount == emptyCount)
+
+        if (previousVisibilityState == empty) {
+            Log_OC.d(TAG, "no need to configure empty view, state didn't change")
+            return
+        }
+
+        Log_OC.d(TAG, "changing empty view state, adapter item count: ${recyclerViewAdapter.itemCount}")
+
+        previousVisibilityState = empty
+        view.setVisibleIf(empty)
+        view.isFocusable = empty
+        setVisibleIf(!empty)
+    }
+
+    private val observer: AdapterDataObserver = object : AdapterDataObserver() {
+        override fun onChanged() {
+            super.onChanged()
+            configureEmptyView()
+        }
+
+        override fun onItemRangeChanged(positionStart: Int, itemCount: Int) {
+            super.onItemRangeChanged(positionStart, itemCount)
+            configureEmptyView()
+        }
+
+        override fun onItemRangeChanged(positionStart: Int, itemCount: Int, payload: Any?) {
+            super.onItemRangeChanged(positionStart, itemCount, payload)
+            configureEmptyView()
+        }
+
+        override fun onItemRangeMoved(fromPosition: Int, toPosition: Int, itemCount: Int) {
+            super.onItemRangeMoved(fromPosition, toPosition, itemCount)
+            configureEmptyView()
+        }
+
+        override fun onItemRangeInserted(positionStart: Int, itemCount: Int) {
+            super.onItemRangeInserted(positionStart, itemCount)
+            configureEmptyView()
+        }
+
+        override fun onItemRangeRemoved(positionStart: Int, itemCount: Int) {
+            super.onItemRangeRemoved(positionStart, itemCount)
+            configureEmptyView()
+        }
+    }
+
+    fun setHasFooter(bool: Boolean) {
+        hasFooter = bool
+    }
+}