From f253f2a798a277769e4f7cff25a214e653b80e49 Mon Sep 17 00:00:00 2001
From: Satyajit Ghana <satyajitghana7@gmail.com>
Date: Wed, 14 Oct 2020 22:25:25 +0530
Subject: [PATCH] Update: Add default parameters, animation dispose

Default parameters cannot be initialized again using `this.param`, fixed that
added animation dispose
---
 lib/custom_switch.dart | 84 ++++++++++++++++++++++++------------------
 1 file changed, 48 insertions(+), 36 deletions(-)

diff --git a/lib/custom_switch.dart b/lib/custom_switch.dart
index c9cf4bf..ed0b463 100644
--- a/lib/custom_switch.dart
+++ b/lib/custom_switch.dart
@@ -6,23 +6,28 @@ class CustomSwitch extends StatefulWidget {
   final bool value;
   final ValueChanged<bool> onChanged;
   final Color activeColor;
-  final Color inactiveColor = Colors.grey;
-  final String activeText = 'On';
-  final String inactiveText = 'Off';
-  final Color activeTextColor = Colors.white70;
-  final Color inactiveTextColor = Colors.white70;
+  final Color inactiveColor;
+  final String activeText;
+  final String inactiveText;
+  final Color activeTextColor;
+  final Color inactiveTextColor;
 
   const CustomSwitch({
-    Key key, 
-    this.value, 
-    this.onChanged, 
-    this.activeColor, 
-    this.inactiveColor, 
-    this.activeText,
-    this.inactiveText,
-    this.activeTextColor,
-    this.inactiveTextColor})
-      : super(key: key);
+    Key key,
+    this.value,
+    this.onChanged,
+    this.activeColor,
+    inactiveColor,
+    activeText,
+    inactiveText,
+    activeTextColor,
+    inactiveTextColor})
+      : this.inactiveColor = inactiveColor ?? Colors.grey,
+        this.activeText = activeText ?? 'On',
+        this.inactiveText = inactiveText ?? 'Off',
+        this.activeTextColor = activeTextColor ?? Colors.white70,
+        this.inactiveTextColor = inactiveTextColor ?? Colors.white70,
+        super(key: key);
 
   @override
   _CustomSwitchState createState() => _CustomSwitchState();
@@ -39,10 +44,17 @@ class _CustomSwitchState extends State<CustomSwitch>
     _animationController =
         AnimationController(vsync: this, duration: Duration(milliseconds: 60));
     _circleAnimation = AlignmentTween(
-            begin: widget.value ? Alignment.centerRight : Alignment.centerLeft,
-            end: widget.value ? Alignment.centerLeft : Alignment.centerRight)
+        begin: widget.value ? Alignment.centerRight : Alignment.centerLeft,
+        end: widget.value ? Alignment.centerLeft : Alignment.centerRight)
         .animate(CurvedAnimation(
-            parent: _animationController, curve: Curves.linear));
+        parent: _animationController, curve: Curves.linear));
+  }
+
+
+  @override
+  void dispose() {
+    _animationController ?? _animationController.dispose();
+    super.dispose();
   }
 
   @override
@@ -77,15 +89,15 @@ class _CustomSwitchState extends State<CustomSwitch>
                 children: <Widget>[
                   _circleAnimation.value == Alignment.centerRight
                       ? Padding(
-                          padding: const EdgeInsets.only(left: 4.0, right: 4.0),
-                          child: Text(
-                            widget.activeText,
-                            style: TextStyle(
-                                color: widget.activeTextColor,
-                                fontWeight: FontWeight.w900,
-                                fontSize: 16.0),
-                          ),
-                        )
+                    padding: const EdgeInsets.only(left: 4.0, right: 4.0),
+                    child: Text(
+                      widget.activeText,
+                      style: TextStyle(
+                          color: widget.activeTextColor,
+                          fontWeight: FontWeight.w900,
+                          fontSize: 16.0),
+                    ),
+                  )
                       : Container(),
                   Align(
                     alignment: _circleAnimation.value,
@@ -98,15 +110,15 @@ class _CustomSwitchState extends State<CustomSwitch>
                   ),
                   _circleAnimation.value == Alignment.centerLeft
                       ? Padding(
-                          padding: const EdgeInsets.only(left: 4.0, right: 5.0),
-                          child: Text(
-                            widget.inactiveText,
-                            style: TextStyle(
-                                color: widget.inactiveTextColor,
-                                fontWeight: FontWeight.w900,
-                                fontSize: 16.0),
-                          ),
-                        )
+                    padding: const EdgeInsets.only(left: 4.0, right: 5.0),
+                    child: Text(
+                      widget.inactiveText,
+                      style: TextStyle(
+                          color: widget.inactiveTextColor,
+                          fontWeight: FontWeight.w900,
+                          fontSize: 16.0),
+                    ),
+                  )
                       : Container(),
                 ],
               ),