Added hold duration in rotate and fade animation

example/lib/main.dart

@@ -150,13 +150,15 @@ List<AnimatedTextExample> animatedTextExamples({VoidCallback? onTap}) =>
                   ),
                   child: AnimatedTextKit(
                     animatedTexts: [
-                      RotateAnimatedText('AWESOME'),
+                      RotateAnimatedText('AWESOME',
+                          holdDuration: Duration(seconds: 1)),
                       RotateAnimatedText('OPTIMISTIC'),
                       RotateAnimatedText(
                         'DIFFERENT',
                         textStyle: const TextStyle(
                           decoration: TextDecoration.underline,
                         ),
+                        holdDuration: Duration(seconds: 5),
                       ),
                     ],
                     onTap: onTap,
@@ -370,7 +372,7 @@ List<AnimatedTextExample> animatedTextExamples({VoidCallback? onTap}) =>
                 fontSize: 64.0,
               ),
               rotateOut: false,
-              duration: const Duration(milliseconds: 400),
+              animationDuration: const Duration(milliseconds: 400),
             )
           ],
         ),

lib/src/fade.dart

@@ -5,42 +5,60 @@ import 'animated_text.dart';
 ///
 /// ![Fade example](https://raw.githubusercontent.com/aagarwal1012/Animated-Text-Kit/master/display/fade.gif)
 class FadeAnimatedText extends AnimatedText {
-  /// Marks ending of fade-in interval, default value = 0.5
-  final double fadeInEnd;
+  /// The Duration of fade-in animation, default value = const Duration(milliseconds: 1000)
+  /// Total duration = fadeInDuration + holdDuration + fadeOutDuration
+  final Duration fadeInDuration;
 
-  /// Marks the beginning of fade-out interval, default value = 0.8
-  final double fadeOutBegin;
+  /// The Duration of text hold between fadein and fadeout, default value = const Duration(milliseconds: 2000)
+  /// Total duration = fadeInDuration + holdDuration + fadeOutDuration
+  final Duration holdDuration;
+
+  /// The Duration of fade-out animation, default value = const Duration(milliseconds: 1000)
+  /// Total duration = fadeInDuration + holdDuration + fadeOutDuration
+  final Duration fadeOutDuration;
+
+  // /// Marks the beginning of fade-out interval, default value = 0.8
+  // final Duration fadeOutBegin;
   FadeAnimatedText(
     String text, {
     TextAlign textAlign = TextAlign.start,
     TextStyle? textStyle,
-    Duration duration = const Duration(milliseconds: 2000),
-    this.fadeInEnd = 0.5,
-    this.fadeOutBegin = 0.8,
-  })  : assert(fadeInEnd < fadeOutBegin,
-            'The "fadeInEnd" argument must be less than "fadeOutBegin"'),
+    this.holdDuration = const Duration(milliseconds: 2000),
+    this.fadeInDuration = const Duration(milliseconds: 1000),
+    this.fadeOutDuration = const Duration(milliseconds: 1000),
+  }) :
+        // assert(fadeInEnd < fadeOutBegin,
+        //           'The "fadeInEnd" argument must be less than "fadeOutBegin"'),
         super(
           text: text,
           textAlign: textAlign,
           textStyle: textStyle,
-          duration: duration,
+          duration: fadeInDuration + holdDuration + fadeOutDuration,
         );
 
   late Animation<double> _fadeIn, _fadeOut;
 
   @override
   void initAnimation(AnimationController controller) {
+    final _fadeOutStartTime =
+        (fadeInDuration.inMilliseconds + holdDuration.inMilliseconds);
     _fadeIn = Tween<double>(begin: 0.0, end: 1.0).animate(
       CurvedAnimation(
         parent: controller,
-        curve: Interval(0.0, fadeInEnd, curve: Curves.linear),
+        curve: Interval(
+            0.0, fadeInDuration.inMilliseconds / duration.inMilliseconds,
+            curve: Curves.linear),
       ),
     );
 
     _fadeOut = Tween<double>(begin: 1.0, end: 0.0).animate(
       CurvedAnimation(
         parent: controller,
-        curve: Interval(fadeOutBegin, 1.0, curve: Curves.linear),
+        curve: Interval(
+            _fadeOutStartTime / duration.inMilliseconds,
+            (_fadeOutStartTime + fadeOutDuration.inMilliseconds) /
+                duration.inMilliseconds.toDouble(),
+            curve: Curves.linear),
       ),
     );
   }
@@ -109,9 +127,9 @@ class FadeAnimatedTextKit extends AnimatedTextKit {
                 _,
                 textAlign: textAlign,
                 textStyle: textStyle,
-                duration: duration,
-                fadeInEnd: fadeInEnd,
-                fadeOutBegin: fadeOutBegin,
+                holdDuration: duration,
+                // fadeInEnd: fadeInEnd,
+                // fadeOutBegin: fadeOutBegin,
               ))
           .toList();
 }

lib/src/rotate.dart

@@ -30,11 +30,22 @@ class RotateAnimatedText extends AnimatedText {
   /// By default, it is set to true.
   final bool rotateOut;
 
+  /// The Duration of text hold, default value = const Duration(milliseconds: 2000)
+  /// Total Duration = animationDuration * (rotateOut ? 2 : 1) + holdDuration
+  final Duration holdDuration;
+
+  /// The Duration text will take to animate in and out.
+  /// By default it is set to const Duration(milliseconds: 1000)
+  /// Out Duration will only be applied if [rotateOut] is set to `true`
+  /// Total Duration = animationDuration * (rotateOut ? 2 : 1) + holdDuration
+  final Duration animationDuration;
+
   RotateAnimatedText(
     String text, {
     TextAlign textAlign = TextAlign.start,
     TextStyle? textStyle,
-    Duration duration = const Duration(milliseconds: 2000),
+    this.animationDuration = const Duration(milliseconds: 1000),
+    this.holdDuration = const Duration(microseconds: 2000),
     this.transitionHeight,
     this.alignment = Alignment.center,
     this.textDirection = TextDirection.ltr,
@@ -43,7 +54,7 @@ class RotateAnimatedText extends AnimatedText {
           text: text,
           textAlign: textAlign,
           textStyle: textStyle,
-          duration: duration,
+          duration: animationDuration * (rotateOut ? 2 : 1) + holdDuration,
         );
 
   late Animation<double> _fadeIn, _fadeOut;
@@ -53,22 +64,26 @@ class RotateAnimatedText extends AnimatedText {
   void initAnimation(AnimationController controller) {
     final direction = textDirection;
 
-    final inIntervalEnd = rotateOut ? 0.4 : 1.0;
+    final inIntervalEndTime = animationDuration.inMilliseconds;
+    final outIntervalStartTime =
+        inIntervalEndTime + holdDuration.inMilliseconds;
 
     _slideIn = AlignmentTween(
       begin: Alignment.topCenter.add(alignment).resolve(direction),
       end: Alignment.center.add(alignment).resolve(direction),
     ).animate(
       CurvedAnimation(
         parent: controller,
-        curve: Interval(0.0, inIntervalEnd, curve: Curves.linear),
+        curve: Interval(0.0, inIntervalEndTime / duration.inMilliseconds,
+            curve: Curves.linear),
       ),
     );
 
     _fadeIn = Tween<double>(begin: 0.0, end: 1.0).animate(
       CurvedAnimation(
         parent: controller,
-        curve: Interval(0.0, inIntervalEnd, curve: Curves.easeOut),
+        curve: Interval(0.0, inIntervalEndTime / duration.inMilliseconds,
+            curve: Curves.easeOut),
       ),
     );
 
@@ -79,14 +94,16 @@ class RotateAnimatedText extends AnimatedText {
       ).animate(
         CurvedAnimation(
           parent: controller,
-          curve: const Interval(0.7, 1.0, curve: Curves.linear),
+          curve: Interval(outIntervalStartTime / duration.inMilliseconds, 1.0,
+              curve: Curves.linear),
         ),
       );
 
       _fadeOut = Tween<double>(begin: 1.0, end: 0.0).animate(
         CurvedAnimation(
           parent: controller,
-          curve: const Interval(0.7, 1.0, curve: Curves.easeIn),
+          curve: Interval(outIntervalStartTime / duration.inMilliseconds, 1.0,
+              curve: Curves.easeIn),
         ),
       );
     }
@@ -177,7 +194,7 @@ class RotateAnimatedTextKit extends AnimatedTextKit {
                 _,
                 textAlign: textAlign,
                 textStyle: textStyle,
-                duration: duration,
+                animationDuration: duration,
                 transitionHeight: transitionHeight,
                 alignment: alignment,
                 textDirection: textDirection,