Fixes transitions and curves arguments in navigation methods

- renamed and added defaults transition duration and types in "GetInterfase"
- added missing parameters in `Get.to` / `Get.offAll`,  fixes #570
- added optional `transitionDuration` and `transitionCurve` to `Get.dialog()`

 import 'package:flutter/material.dart';
+
+import '../../utils.dart';
 import '../navigation/root/parse_route.dart';
 import '../navigation/root/root_controller.dart';
 import '../navigation/routes/custom_transition.dart';
 import '../navigation/routes/observers/route_observer.dart';
 import '../navigation/routes/transitions_type.dart';
-import '../../utils.dart';
 
 ///Use Get.to instead of Navigator.push, Get.off instead of Navigator.pushReplacement,
 ///Get.offAll instead of Navigator.pushAndRemoveUntil. For named routes just add "named"
@@ -16,8 +17,14 @@ import '../../utils.dart';
 abstract class GetInterface {
   bool defaultPopGesture = GetPlatform.isIOS;
   bool defaultOpaqueRoute = true;
+
   Transition defaultTransition;
-  Duration defaultDurationTransition = Duration(milliseconds: 400);
+  Duration defaultTransitionDuration = Duration(milliseconds: 400);
+  Curve defaultTransitionCurve = Curves.easeOutQuad;
+
+  Curve defaultDialogTransitionCurve = Curves.easeOutQuad;
+  Duration defaultDialogTransitionDuration = Duration(milliseconds: 400);
+
   bool defaultGlobalState = true;
   RouteSettings settings;
   String defaultSeparator = "_";

@@ -42,6 +42,7 @@ extension GetNavigation on GetInterface {
     Widget page, {
     bool opaque,
     Transition transition,
+    Curve curve,
     Duration duration,
     int id,
     bool fullscreenDialog = false,
@@ -65,9 +66,10 @@ extension GetNavigation on GetInterface {
             ),
             popGesture: popGesture ?? defaultPopGesture,
             transition: transition ?? defaultTransition,
+            curve: curve ?? defaultTransitionCurve,
             fullscreenDialog: fullscreenDialog,
             binding: binding,
-            transitionDuration: duration ?? defaultDurationTransition,
+            transitionDuration: duration ?? defaultTransitionDuration,
           ),
         );
   }
@@ -317,7 +319,8 @@ extension GetNavigation on GetInterface {
   /// It has the advantage of not needing context,
   /// so you can call from your business logic
   ///
-  /// You can set a custom [transition], and a transition [duration].
+  /// You can set a custom [transition], define a Tween [curve],
+  /// and a transition [duration].
   ///
   /// You can send any type of value to the other route in the [arguments].
   ///
@@ -338,6 +341,7 @@ extension GetNavigation on GetInterface {
     Widget page, {
     bool opaque = false,
     Transition transition,
+    Curve curve,
     bool popGesture,
     int id,
     Object arguments,
@@ -359,7 +363,8 @@ extension GetNavigation on GetInterface {
         fullscreenDialog: fullscreenDialog,
         popGesture: popGesture ?? defaultPopGesture,
         transition: transition ?? defaultTransition,
-        transitionDuration: duration ?? defaultDurationTransition));
+        curve: curve ?? defaultTransitionCurve,
+        transitionDuration: duration ?? defaultTransitionDuration));
   }
 
   /// **Navigation.pushAndRemoveUntil()** shortcut .<br><br>
@@ -370,7 +375,7 @@ extension GetNavigation on GetInterface {
   /// It has the advantage of not needing context,
   /// so you can call from your business logic
   ///
-  /// You can set a custom [transition], and a transition [duration].
+  /// You can set a custom [transition], a [curve] and a transition [duration].
   ///
   /// You can send any type of value to the other route in the [arguments].
   ///
@@ -401,8 +406,9 @@ extension GetNavigation on GetInterface {
     Object arguments,
     Bindings binding,
     bool fullscreenDialog = false,
-    Duration duration,
     Transition transition,
+    Curve curve,
+    Duration duration,
   }) {
     var route = (Route<dynamic> rota) => false;
 
@@ -418,12 +424,16 @@ extension GetNavigation on GetInterface {
           fullscreenDialog: fullscreenDialog,
           routeName: routename,
           transition: transition ?? defaultTransition,
-          transitionDuration: duration ?? defaultDurationTransition,
+          curve: curve ?? defaultTransitionCurve,
+          transitionDuration: duration ?? defaultTransitionDuration,
         ),
         predicate ?? route);
   }
 
-  /// Show a dialog
+  /// Show a dialog.
+  /// You can pass a [transitionDuration] and/or [transitionCurve],
+  /// overriding the defaults when the dialog shows up and closes.
+  /// When the dialog closes, uses those animations in reverse.
   Future<T> dialog<T>(
     Widget widget, {
     bool barrierDismissible = true,
@@ -431,6 +441,8 @@ extension GetNavigation on GetInterface {
     bool useSafeArea = true,
     bool useRootNavigator = true,
     RouteSettings routeSettings,
+    Duration transitionDuration,
+    Curve transitionCurve,
   }) {
     assert(widget != null);
     assert(barrierDismissible != null);
@@ -456,12 +468,12 @@ extension GetNavigation on GetInterface {
       barrierDismissible: barrierDismissible,
       barrierLabel: MaterialLocalizations.of(context).modalBarrierDismissLabel,
       barrierColor: barrierColor ?? Colors.black54,
-      transitionDuration: const Duration(milliseconds: 150),
+      transitionDuration: transitionDuration ?? defaultDialogTransitionDuration,
       transitionBuilder: (context, animation, secondaryAnimation, child) {
         return FadeTransition(
           opacity: CurvedAnimation(
             parent: animation,
-            curve: Curves.easeOut,
+            curve: transitionCurve ?? defaultDialogTransitionCurve,
           ),
           child: child,
         );
@@ -856,7 +868,7 @@ extension GetNavigation on GetInterface {
     }
 
     if (defaultDurationTransition != null) {
-      this.defaultDurationTransition = defaultDurationTransition;
+      this.defaultTransitionDuration = defaultDurationTransition;
     }
 
     if (defaultGlobalState != null) {

@@ -4,6 +4,7 @@ import 'package:get/get.dart';
 import 'package:get/src/core/log.dart';
 import 'package:get/src/instance/get_instance.dart';
 import 'package:get/src/navigation/routes/get_route.dart';
+
 import 'root_controller.dart';
 import 'smart_management.dart';
 
@@ -209,7 +210,7 @@ class GetMaterialApp extends StatelessWidget {
             defaultOpaqueRoute: opaqueRoute ?? Get.isOpaqueRouteDefault,
             defaultPopGesture: popGesture ?? Get.isPopGestureEnable,
             defaultDurationTransition:
-                transitionDuration ?? Get.defaultDurationTransition,
+                transitionDuration ?? Get.defaultTransitionDuration,
             defaultGlobalState: defaultGlobalState ?? Get.defaultGlobalState,
           );
         },