Add ListPreferenceEx

app/src/main/java/com/gaurav/avnc/ui/prefs/ListPreferenceEx.kt

@@ -0,0 +1,30 @@
+/*
+ * Copyright (c) 2022  Gaurav Ujjwal.
+ *
+ * SPDX-License-Identifier:  GPL-3.0-or-later
+ *
+ * See COPYING.txt for more details.
+ */
+
+package com.gaurav.avnc.ui.prefs
+
+import android.content.Context
+import android.util.AttributeSet
+import androidx.preference.ListPreference
+
+/**
+ * List preference with some extra features.
+ */
+class ListPreferenceEx(context: Context, attrs: AttributeSet) : ListPreference(context, attrs) {
+
+    /**
+     * Summary used when preference is disabled.
+     */
+    var disabledStateSummary: CharSequence? = null
+
+    override fun getSummary(): CharSequence? {
+        if (!isEnabled && disabledStateSummary != null)
+            return disabledStateSummary
+        return super.getSummary()
+    }
+}