macosx: add input changed event and reset shown crop values for new input

(cherry picked from commit 84d73bcd127eaf259f358a2b823802c93732ac55)
Signed-off-by: Jean-Baptiste Kempf <jb@videolan.org>

modules/gui/macosx/VideoEffects.m

@@ -208,9 +208,22 @@ static VLCVideoEffects *_o_sharedInstance = nil;
 
     [o_tableView selectFirstTabViewItem:self];
 
+    [[NSNotificationCenter defaultCenter] addObserver:self
+                                             selector:@selector(inputChangedEvent:)
+                                                 name:VLCInputChangedNotification
+                                               object:nil];
+
+
     [self resetValues];
 }
 
+- (void)dealloc
+{
+    [[NSNotificationCenter defaultCenter] removeObserver:self];
+
+    [super dealloc];
+}
+
 - (void)updateCocoaWindowLevel:(NSInteger)i_level
 {
     if (o_window && [o_window isVisible] && [o_window level] != i_level)
@@ -219,6 +232,16 @@ static VLCVideoEffects *_o_sharedInstance = nil;
 
 #pragma mark -
 #pragma mark internal functions
+
+-(void)inputChangedEvent:(NSNotification *)o_notification
+{
+    // reset crop values when input changed
+    [self setCropBottomValue:0];
+    [self setCropTopValue:0];
+    [self setCropLeftValue:0];
+    [self setCropRightValue:0];
+}
+
 - (void)resetProfileSelector
 {
     NSUserDefaults *defaults = [NSUserDefaults standardUserDefaults];

modules/gui/macosx/intf.h

@@ -57,6 +57,7 @@ vout_thread_t *getVout(void);
 vout_thread_t *getVoutForActiveWindow(void);
 audio_output_t *getAout(void);
 
+static NSString * VLCInputChangedNotification = @"VLCInputChangedNotification";
 
 /*****************************************************************************
  * VLCMain interface

modules/gui/macosx/intf.m

@@ -1274,6 +1274,9 @@ static bool f_appExit = false;
         p_current_input = NULL;
 
         [o_mainmenu setRateControlsEnabled: NO];
+
+        [[NSNotificationCenter defaultCenter] postNotificationName:VLCInputChangedNotification
+                                                            object:nil];
     }
     else if (!p_current_input) {
         // object is hold here and released then it is dead
@@ -1290,6 +1293,9 @@ static bool f_appExit = false;
             p_input_changed = vlc_object_hold(p_current_input);
 
             [[self playlist] continuePlaybackWhereYouLeftOff:p_current_input];
+
+            [[NSNotificationCenter defaultCenter] postNotificationName:VLCInputChangedNotification
+                                                                object:nil];
         }
     }