Merge pull request #22047 from jlopezr:trackbar-ordered-in-mac

* In Mac highgui now shows trackbars in creation order

* In Mac highgui trackbars show current value

* Remove trailing spaces in objectivec code

modules/highgui/src/window_cocoa.mm

@@ -92,6 +92,7 @@ static bool wasInitialized = false;
 @interface CVSlider : NSView {
     NSSlider *slider;
     NSTextField *name;
+    NSString *initialName;
     int *value;
     void *userData;
     CvTrackbarCallback callback;
@@ -99,6 +100,7 @@ static bool wasInitialized = false;
 }
 @property(retain) NSSlider *slider;
 @property(retain) NSTextField *name;
+@property(retain) NSString *initialName;
 @property(assign) int *value;
 @property(assign) void *userData;
 @property(assign) CvTrackbarCallback callback;
@@ -107,6 +109,7 @@ static bool wasInitialized = false;
 
 @interface CVWindow : NSWindow {
     NSMutableDictionary *sliders;
+    NSMutableArray *slidersKeys;
     CvMouseCallback mouseCallback;
     void *mouseParam;
     BOOL autosize;
@@ -121,6 +124,7 @@ static bool wasInitialized = false;
 @property(assign) int x0;
 @property(assign) int y0;
 @property(retain) NSMutableDictionary *sliders;
+@property(retain) NSMutableArray *slidersKeys;
 @property(readwrite) int status;
 - (CVView *)contentView;
 - (void)cvSendMouseEvent:(NSEvent *)event type:(int)type flags:(int)flags;
@@ -842,6 +846,7 @@ static NSSize constrainAspectRatio(NSSize base, NSSize constraint) {
 @synthesize x0;
 @synthesize y0;
 @synthesize sliders;
+@synthesize slidersKeys;
 @synthesize status;
 
 - (void)cvSendMouseEvent:(NSEvent *)event type:(int)type flags:(int)flags {
@@ -933,6 +938,9 @@ static NSSize constrainAspectRatio(NSSize base, NSSize constraint) {
     if(sliders == nil)
         sliders = [[NSMutableDictionary alloc] init];
 
+    if(slidersKeys == nil)
+        slidersKeys = [[NSMutableArray alloc] init];
+
     NSString *cvname = [NSString stringWithFormat:@"%s", name];
 
     // Avoid overwriting slider
@@ -942,18 +950,23 @@ static NSSize constrainAspectRatio(NSSize base, NSSize constraint) {
     // Create slider
     CVSlider *slider = [[CVSlider alloc] init];
     [[slider name] setStringValue:cvname];
+    slider.initialName = [NSString stringWithFormat:@"%s", name];
     [[slider slider] setMaxValue:max];
     [[slider slider] setMinValue:0];
     if(value)
     {
         [[slider slider] setIntValue:*value];
         [slider setValue:value];
+        NSString *temp = [slider initialName];
+        NSString *text = [NSString stringWithFormat:@"%@ %d", temp, *value];
+        [[slider name] setStringValue: text];
     }
     if(callback)
         [slider setCallback:callback];
 
     // Save slider
     [sliders setValue:slider forKey:cvname];
+    [slidersKeys addObject:cvname];
     [[self contentView] addSubview:slider];
 
 
@@ -1092,7 +1105,7 @@ static NSSize constrainAspectRatio(NSSize base, NSSize constraint) {
 
     CVWindow *cvwindow = (CVWindow *)[self window];
     if ([cvwindow respondsToSelector:@selector(sliders)]) {
-        for(NSString *key in [cvwindow sliders]) {
+        for(NSString *key in [cvwindow slidersKeys]) {
             CVSlider *slider = [[cvwindow sliders] valueForKey:key];
             NSRect r = [slider frame];
             r.origin.y = height - r.size.height;
@@ -1144,6 +1157,7 @@ static NSSize constrainAspectRatio(NSSize base, NSSize constraint) {
 
 @synthesize slider;
 @synthesize name;
+@synthesize initialName;
 @synthesize value;
 @synthesize userData;
 @synthesize callback;
@@ -1186,6 +1200,9 @@ static NSSize constrainAspectRatio(NSSize base, NSSize constraint) {
 - (void)sliderChanged:(NSNotification *)notification {
     (void)notification;
     int pos = [slider intValue];
+    NSString *temp = [self initialName];
+    NSString *text = [NSString stringWithFormat:@"%@ %d", temp, *value];
+    [name setStringValue: text];
     if(value)
         *value = pos;
     if(callback)