improvements.

lib/ui/screens/surah_screen.dart

@@ -118,7 +118,7 @@ class _SurahScreenState extends State<SurahScreen> {
                   if (_selectedFromAya != index) {
                     _selectedFromAya = index;
                     _selectedToAya = index;
-                    filterData();
+                    getAyaByRange();
                   }
                 }),
               ),
@@ -127,7 +127,7 @@ class _SurahScreenState extends State<SurahScreen> {
                 child: CommonDropDownButton(_selectedToAya, list: _toAyaList.map((e) => "الى الاية" + " $e").toList(), onSelect: (index) {
                   if (_selectedToAya != index) {
                     _selectedToAya = index;
-                    filterData();
+                    getAyaByRange();
                   }
                 }),
               ),
@@ -147,8 +147,24 @@ class _SurahScreenState extends State<SurahScreen> {
                   Row(
                     mainAxisAlignment: MainAxisAlignment.spaceBetween,
                     children: [
-                      nextOptionButton("assets/icons/prev.svg", "سورة الفاتحة", () {}),
-                      previousOptionButton("assets/icons/next.svg", "سورة آل عمران", () {}),
+                      nextOptionButton(
+                          "assets/icons/prev.svg",
+                          _selectedSurah == 0 ? "" : _surahList[_selectedSurah - 1],
+                          _selectedSurah == 0
+                              ? null
+                              : () {
+                                  _selectedSurah = _selectedSurah - 1;
+                                  filterData();
+                                }),
+                      previousOptionButton(
+                          "assets/icons/next.svg",
+                          _selectedSurah == (_surahList.length) ? "" : _surahList[_selectedSurah + 1],
+                          _selectedSurah == (_surahList.length)
+                              ? null
+                              : () {
+                                  _selectedSurah = _selectedSurah + 1;
+                                  filterData();
+                                }),
                     ],
                   ),
                   Expanded(
@@ -204,36 +220,40 @@ class _SurahScreenState extends State<SurahScreen> {
   Widget nextOptionButton(String icon, String text, VoidCallback onPressed) {
     return InkWell(
       onTap: onPressed,
-      child: Row(
-        crossAxisAlignment: CrossAxisAlignment.center,
-        mainAxisSize: MainAxisSize.min,
-        children: [
-          SvgPicture.asset(icon, height: 12, width: 12),
-          SizedBox(width: 4),
-          Text(
-            text,
-            style: TextStyle(color: ColorConsts.textGrey),
-          ),
-        ],
-      ),
+      child: onPressed == null
+          ? SizedBox()
+          : Row(
+              crossAxisAlignment: CrossAxisAlignment.center,
+              mainAxisSize: MainAxisSize.min,
+              children: [
+                SvgPicture.asset(icon, height: 12, width: 12),
+                SizedBox(width: 4),
+                Text(
+                  text,
+                  style: TextStyle(color: ColorConsts.textGrey),
+                ),
+              ],
+            ),
     );
   }
 
   Widget previousOptionButton(String icon, String text, VoidCallback onPressed) {
     return InkWell(
       onTap: onPressed,
-      child: Row(
-        crossAxisAlignment: CrossAxisAlignment.center,
-        mainAxisSize: MainAxisSize.min,
-        children: [
-          Text(
-            text,
-            style: TextStyle(color: ColorConsts.textGrey),
-          ),
-          SizedBox(width: 4),
-          SvgPicture.asset(icon, height: 12, width: 12),
-        ],
-      ),
+      child: onPressed == null
+          ? SizedBox()
+          : Row(
+              crossAxisAlignment: CrossAxisAlignment.center,
+              mainAxisSize: MainAxisSize.min,
+              children: [
+                Text(
+                  text,
+                  style: TextStyle(color: ColorConsts.textGrey),
+                ),
+                SizedBox(width: 4),
+                SvgPicture.asset(icon, height: 12, width: 12),
+              ],
+            ),
     );
   }
 }