Allow for custom text styles

lib/flutter_switch.dart

@@ -43,6 +43,10 @@ class FlutterSwitch extends StatefulWidget {
     this.inactiveIcon,
     this.duration = const Duration(milliseconds: 200),
     this.disabled = false,
+    this.activeTextStyle,
+    this.inactiveTextStyle,
+    this.activeTextAlignment = Alignment.centerLeft,
+    this.inactiveTextAlignment = Alignment.centerLeft,
   })  : assert(
             (switchBorder == null || activeSwitchBorder == null) &&
                 (switchBorder == null || inactiveSwitchBorder == null),
@@ -251,6 +255,22 @@ class FlutterSwitch extends StatefulWidget {
   /// Defaults to the value of false.
   final bool disabled;
 
+  /// The text style to use on the text value when the switch is on.
+  /// This parameter is only necessary when [showOnOff] property is true.
+  /// The use of this overrides the [activeTextColor] and [activeTextFontWeight] properties.
+  final TextStyle? activeTextStyle;
+
+  /// The text style to use on the text value when the switch is off.
+  /// /// This parameter is only necessary when [showOnOff] property is true.
+  /// The use of this overrides the [inactiveTextColor] and [inactiveTextFontWeight] properties.
+  final TextStyle? inactiveTextStyle;
+
+  /// The alignment of the text when the switch is on.
+  final Alignment activeTextAlignment;
+
+  /// The alignment of the text when the switch is off.
+  final Alignment inactiveTextAlignment;
+
   @override
   _FlutterSwitchState createState() => _FlutterSwitchState();
 }
@@ -431,12 +451,16 @@ class _FlutterSwitchState extends State<FlutterSwitch>
 
   Widget get _activeText {
     if (widget.showOnOff) {
-      return Text(
-        widget.activeText ?? "On",
-        style: TextStyle(
-          color: widget.activeTextColor,
-          fontWeight: _activeTextFontWeight,
-          fontSize: widget.valueFontSize,
+      return Align(
+        alignment: widget.activeTextAlignment,
+        child: Text(
+          widget.activeText ?? "On",
+          style: widget.activeTextStyle ??
+              TextStyle(
+                color: widget.activeTextColor,
+                fontWeight: _activeTextFontWeight,
+                fontSize: widget.valueFontSize,
+              ),
         ),
       );
     }
@@ -446,14 +470,18 @@ class _FlutterSwitchState extends State<FlutterSwitch>
 
   Widget get _inactiveText {
     if (widget.showOnOff) {
-      return Text(
-        widget.inactiveText ?? "Off",
-        style: TextStyle(
-          color: widget.inactiveTextColor,
-          fontWeight: _inactiveTextFontWeight,
-          fontSize: widget.valueFontSize,
+      return Align(
+        alignment: widget.inactiveTextAlignment,
+        child: Text(
+          widget.inactiveText ?? "Off",
+          style: widget.inactiveTextStyle ??
+              TextStyle(
+                color: widget.inactiveTextColor,
+                fontWeight: _inactiveTextFontWeight,
+                fontSize: widget.valueFontSize,
+              ),
+          textAlign: TextAlign.right,
         ),
-        textAlign: TextAlign.right,
       );
     }