Added menu event notifications

Author: Michael Frederick

MFSideMenu/MFSideMenuContainerViewController.h

@@ -8,6 +8,8 @@
 
 #import <UIKit/UIKit.h>
 
+static NSString *MFSideMenuStateNotificationEvent = @"MFSideMenuStateNotificationEvent";
+
 typedef enum {
     MFSideMenuPanModeNone = 0, // pan disabled
     MFSideMenuPanModeCenterViewController = 1 << 0, // enable panning on the centerViewController
@@ -21,6 +23,13 @@ typedef enum {
     MFSideMenuStateRightMenuOpen // the right-hand menu is open
 } MFSideMenuState;
 
+typedef enum {
+    MFSideMenuStateEventMenuWillOpen, // the menu is going to open
+    MFSideMenuStateEventMenuDidOpen, // the menu finished opening
+    MFSideMenuStateEventMenuWillClose, // the menu is going to close
+    MFSideMenuStateEventMenuDidClose // the menu finished closing
+} MFSideMenuStateEvent;
+
 
 @interface MFSideMenuContainerViewController : UIViewController<UIGestureRecognizerDelegate>
 

MFSideMenu/MFSideMenuContainerViewController.m

@@ -247,10 +247,13 @@ - (void)setMenuState:(MFSideMenuState)menuState completion:(void (^)(void))compl
     void (^innerCompletion)() = ^ {
         _menuState = menuState;
         if(completion) completion();
+        MFSideMenuStateEvent eventType = (_menuState == MFSideMenuStateClosed) ? MFSideMenuStateEventMenuDidClose : MFSideMenuStateEventMenuDidOpen;
+        [self sendStateEventNotification:eventType];
     };
 
     switch (menuState) {
         case MFSideMenuStateClosed: {
+            [self sendStateEventNotification:MFSideMenuStateEventMenuWillClose];
             [self closeSideMenuCompletion:^{
                 [self.leftMenuViewController view].hidden = YES;
                 [self.rightMenuViewController view].hidden = YES;
@@ -260,11 +263,13 @@ - (void)setMenuState:(MFSideMenuState)menuState completion:(void (^)(void))compl
         }
         case MFSideMenuStateLeftMenuOpen:
             if(!self.leftMenuViewController) return;
+            [self sendStateEventNotification:MFSideMenuStateEventMenuWillOpen];
             [self leftMenuWillShow];
             [self openLeftSideMenuCompletion:innerCompletion];
             break;
         case MFSideMenuStateRightMenuOpen:
             if(!self.rightMenuViewController) return;
+            [self sendStateEventNotification:MFSideMenuStateEventMenuWillOpen];
             [self rightMenuWillShow];
             [self openRightSideMenuCompletion:innerCompletion];
             break;
@@ -273,6 +278,7 @@ - (void)setMenuState:(MFSideMenuState)menuState completion:(void (^)(void))compl
     }
 }
 
+// these callbacks are called when the menu will become visible, not neccessarily when they will OPEN
 - (void)leftMenuWillShow {
     [self.leftMenuViewController view].hidden = NO;
     [self.menuContainerView bringSubviewToFront:[self.leftMenuViewController view]];
@@ -284,6 +290,18 @@ - (void)rightMenuWillShow {
 }
 
 
+#pragma mark -
+#pragma mark - State Event Notification
+
+- (void)sendStateEventNotification:(MFSideMenuStateEvent)event {
+    NSDictionary *userInfo = [NSDictionary dictionaryWithObject:[NSNumber numberWithInt:event]
+                                                         forKey:@"eventType"];
+    [[NSNotificationCenter defaultCenter] postNotificationName:MFSideMenuStateNotificationEvent
+                                                        object:self
+                                                      userInfo:userInfo];
+}
+
+
 #pragma mark -
 #pragma mark - Side Menu Positioning