Add drawer

lib/src/helper/utils.dart

@@ -1,5 +1,6 @@
 import 'dart:ui';
 
+import 'package:flutter/foundation.dart';
 import 'package:flutter_slider_drawer/flutter_slider_drawer.dart';
 
 class Utils {
@@ -8,16 +9,23 @@ class Utils {
   ///
   Utils._();
 
-  static Offset getOffsetValues(SlideDirection direction, double value) {
+  static Offset getOffsetValues(SlideDirection direction, double value,
+      double sliderCloseSize, double sliderOpenSize) {
+    final sliderAnimateSize = sliderOpenSize - sliderCloseSize;
+    final sliderCurrentSize = clampDouble(
+        sliderAnimateSize * value + sliderCloseSize,
+        sliderCloseSize,
+        sliderOpenSize);
+
     switch (direction) {
       case SlideDirection.LEFT_TO_RIGHT:
-        return Offset(value, 0);
+        return Offset(sliderCurrentSize, 0);
       case SlideDirection.RIGHT_TO_LEFT:
-        return Offset(-value, 0);
+        return Offset(-sliderCurrentSize, 0);
       case SlideDirection.TOP_TO_BOTTOM:
-        return Offset(0, value);
+        return Offset(0, sliderCurrentSize);
       default:
-        return Offset(value, 0);
+        return Offset(sliderCurrentSize, 0);
     }
   }
 

lib/src/slider.dart

@@ -60,6 +60,12 @@ class SliderDrawer extends StatefulWidget {
   ///
   final bool isDraggable;
 
+  ///[bool] whether show cover on child when slider is opened
+  final bool showCover;
+
+  ///[Color] whether show cover on child when slider is opened
+  final Color coverColor;
+
   ///[appBar] if you set [null] then it will not display app bar
   ///
   final Widget? appBar;
@@ -104,7 +110,9 @@ class SliderDrawer extends StatefulWidget {
       this.slideDirection = SlideDirection.LEFT_TO_RIGHT,
       this.sliderBoxShadow,
       this.appBar = const SliderAppBar(),
-      this.isCupertino = false})
+      this.isCupertino = false,
+      this.showCover = false,
+      this.coverColor = const Color.fromRGBO(0, 0, 0, 0.3)})
       : super(key: key);
 
   @override
@@ -119,7 +127,7 @@ class SliderDrawerState extends State<SliderDrawer>
   double _percent = 0.0;
 
   late AnimationController _animationDrawerController;
-  late Animation _animation;
+  late Animation<double> _animation;
 
   bool _isDragging = false;
 
@@ -149,9 +157,7 @@ class SliderDrawerState extends State<SliderDrawer>
         vsync: this,
         duration: Duration(milliseconds: widget.animationDuration));
 
-    _animation =
-        Tween<double>(begin: widget.sliderCloseSize, end: widget.sliderOpenSize)
-            .animate(CurvedAnimation(
+    _animation = Tween<double>(begin: 0, end: 1).animate(CurvedAnimation(
         parent: _animationDrawerController,
         curve: Curves.decelerate,
         reverseCurve: Curves.decelerate));
@@ -163,6 +169,9 @@ class SliderDrawerState extends State<SliderDrawer>
   @override
   Widget build(BuildContext context) {
     return LayoutBuilder(builder: (context, constrain) {
+      void onHorizontalDragUpdate(DragUpdateDetails detail) =>
+          _onHorizontalDragUpdate(detail, constrain);
+
       return SizedBox(
           child: Stack(children: [
         ///Menu
@@ -189,15 +198,31 @@ class SliderDrawerState extends State<SliderDrawer>
           builder: (_, child) {
             return Transform.translate(
                 offset: Utils.getOffsetValues(
-                  widget.slideDirection, _animation.value),
-              child: child,
-            );
+                    widget.slideDirection,
+                    _animation.value,
+                    widget.sliderCloseSize,
+                    widget.sliderOpenSize),
+                child: Stack(children: [
+                  child ?? const SizedBox(),
+                  !widget.showCover || _animation.isDismissed
+                      ? const SizedBox()
+                      : GestureDetector(
+                          behavior: HitTestBehavior.opaque,
+                          onTap: _onCoverTap,
+                          onHorizontalDragStart: _onHorizontalDragStart,
+                          onHorizontalDragEnd: _onHorizontalDragEnd,
+                          onHorizontalDragUpdate: onHorizontalDragUpdate,
+                          child: Container(
+                              color: widget.coverColor.withAlpha(
+                                  (_animation.value * widget.coverColor.alpha)
+                                      .round())),
+                        ),
+                ]));
           },
           child: GestureDetector(
             onHorizontalDragStart: _onHorizontalDragStart,
             onHorizontalDragEnd: _onHorizontalDragEnd,
-            onHorizontalDragUpdate: (detail) =>
-                _onHorizontalDragUpdate(detail, constrain),
+            onHorizontalDragUpdate: onHorizontalDragUpdate,
             child: Container(
               width: double.infinity,
               height: double.infinity,
@@ -303,6 +328,12 @@ class SliderDrawerState extends State<SliderDrawer>
     }
   }
 
+  void _onCoverTap() {
+    if (_animation.isCompleted) {
+      closeSlider();
+    }
+  }
+
   move(double percent) {
     _percent = percent;
     _animationDrawerController.value = percent;