From fe6ed9f5781a2e30092f78e769d210487175bd1e Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?=D0=9C=D0=B0=D0=BA=D1=81=D0=B8=D0=BC?=
 <maks.tishchenko@gmail.com>
Date: Thu, 28 Dec 2017 13:17:14 +0300
Subject: [PATCH] add bounces property

---
 Source/BTNavigationDropdownMenu.swift | 25 ++++++++++++++++++++++---
 Source/Internal/BTConfiguration.swift |  2 ++
 2 files changed, 24 insertions(+), 3 deletions(-)

diff --git a/Source/BTNavigationDropdownMenu.swift b/Source/BTNavigationDropdownMenu.swift
index a1791e82..f53a5383 100755
--- a/Source/BTNavigationDropdownMenu.swift
+++ b/Source/BTNavigationDropdownMenu.swift
@@ -29,6 +29,15 @@ import UIKit
 // MARK: BTNavigationDropdownMenu
 open class BTNavigationDropdownMenu: UIView {
 
+    open var bounces: Bool {
+        get {
+            return self.configuration.bounces
+        }
+        set(value) {
+            self.configuration.bounces = value
+        }
+    }
+    
     // The color of menu title. Default is darkGrayColor()
     open var menuTitleColor: UIColor! {
         get {
@@ -460,11 +469,21 @@ open class BTNavigationDropdownMenu: UIView {
 
         self.menuWrapper.superview?.bringSubview(toFront: self.menuWrapper)
 
+        var animationDuration: Double = self.configuration.animationDuration
+        var damping: CGFloat = 1.0
+        var velocity: CGFloat = 1.0
+        
+        if self.bounces {
+            animationDuration *= 1.5
+            damping = 0.7
+            velocity = 0.5
+        }
+        
         UIView.animate(
-            withDuration: self.configuration.animationDuration * 1.5,
+            withDuration: animationDuration,
             delay: 0,
-            usingSpringWithDamping: 0.7,
-            initialSpringVelocity: 0.5,
+            usingSpringWithDamping: damping,
+            initialSpringVelocity: velocity,
             options: [],
             animations: {
                 self.tableView.frame.origin.y = CGFloat(-300)
diff --git a/Source/Internal/BTConfiguration.swift b/Source/Internal/BTConfiguration.swift
index f25c5eb8..21045650 100644
--- a/Source/Internal/BTConfiguration.swift
+++ b/Source/Internal/BTConfiguration.swift
@@ -24,6 +24,7 @@
 import UIKit
 
 final class BTConfiguration {
+    var bounces: Bool!
     var menuTitleColor: UIColor?
     var cellHeight: CGFloat!
     var cellBackgroundColor: UIColor?
@@ -57,6 +58,7 @@ final class BTConfiguration {
         let arrowImagePath = imageBundle?.path(forResource: "arrow_down_icon", ofType: "png")
         
         // Default values
+        self.bounces = true
         self.menuTitleColor = UIColor.darkGray
         self.cellHeight = 50
         self.cellBackgroundColor = UIColor.white