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With your current code snippet, you are simply drawing a rectangle over a selected button. To achieve what you want, two things are needed:

1. Have a global button object/variable which keeps track of the last selected button/rectangle. For this example, let's call it lastSelectedBtn

2. Your callback manipulation will look like this

   void callBackFunc1(int event, int x, int y, int flags, void* userdata)
   {
       Buttons* button = (Buttons*)userdata;
       Vec3b selectButton;
   
       if (event == EVENT_LBUTTONDOWN)
       {
           if (button-> leftHand.contains(Point(x, y)))
           {
               lastSelectedBtn.hidden = true; // hide the last selected button
               lastSelectedBtn = button; // update it to the recently selected button
               selectButton = Vec3b(0, 0, 250);
               cout << "Select Left Hand ROI\n" << endl;
               rectangle(drawRect, button->leftHand, selectButton, 5, 8, 0);
           }
           else if (button->leftElbow.contains(Point(x, y)))
           {
               lastSelectedBtn.hidden = true; // hide the last selected button
               lastSelectedBtn = button; // update it to the recently selected button
               selectButton = Vec3b(0, 0, 250);
               cout << "Select Left Elbow ROI\n" << endl;
               rectangle(drawRect, button->leftElbow, selectButton, 5, 8, 0);
           }
       imshow("Label Tool", drawRect);
     }
   }
   

DISCLAIMER

Correct me if I am wrong but a glimpse into OpenCV High GUI shows that they do not provide any way of hiding created GUI element. This means that the lastSelectedBtn.hidden = true logic part will have to be done at the OS level.

With your current code snippet, you are simply drawing a rectangle over a selected button. To achieve what you want, two things are needed:

1. Have a global button object/variable which keeps track of the last selected button/rectangle. For this example, let's call it lastSelectedBtn

2. Your callback manipulation will look like this

   void callBackFunc1(int event, int x, int y, int flags, void* userdata)
   {
       Buttons* button = (Buttons*)userdata;
       Vec3b selectButton;
   
       if (event == EVENT_LBUTTONDOWN)
       {
           if (button-> leftHand.contains(Point(x, y)))
           {
               lastSelectedBtn.hidden = true; // hide the last selected button
               lastSelectedBtn = button; // update it to the recently selected button
               selectButton = Vec3b(0, 0, 250);
               cout << "Select Left Hand ROI\n" << endl;
               rectangle(drawRect, button->leftHand, selectButton, 5, 8, 0);
           }
           else if (button->leftElbow.contains(Point(x, y)))
           {
               lastSelectedBtn.hidden = true; // hide the last selected button
               lastSelectedBtn = button; // update it to the recently selected button
               selectButton = Vec3b(0, 0, 250);
               cout << "Select Left Elbow ROI\n" << endl;
               rectangle(drawRect, button->leftElbow, selectButton, 5, 8, 0);
           }
       imshow("Label Tool", drawRect);
     }
   }
   

DISCLAIMER

Correct me if I am wrong but a glimpse into OpenCV High GUI shows that they do not provide any a way of hiding created GUI element. elements. This means that the lastSelectedBtn.hidden = true logic part will have to be done at the OS level.

With your current code snippet, you are simply drawing a rectangle over a selected button. To achieve what you want, two things are needed:

1. Have a global button object/variable which keeps track of the last selected button/rectangle. For this example, let's call it lastSelectedBtn

2. Your callback manipulation will look like this

   void callBackFunc1(int event, int x, int y, int flags, void* userdata)
   {
       Buttons* button = (Buttons*)userdata;
       Vec3b selectButton;
   
       if (event == EVENT_LBUTTONDOWN)
       {
           if (button-> leftHand.contains(Point(x, y)))
           {
               lastSelectedBtn.hidden lastSelectedBtn->hidden = true; // hide the last selected button
               lastSelectedBtn = button; // update it to the recently selected button
               selectButton = Vec3b(0, 0, 250);
               cout << "Select Left Hand ROI\n" << endl;
               rectangle(drawRect, button->leftHand, selectButton, 5, 8, 0);
           }
           else if (button->leftElbow.contains(Point(x, y)))
           {
               lastSelectedBtn.hidden lastSelectedBtn->hidden = true; // hide the last selected button
               lastSelectedBtn = button; // update it to the recently selected button
               selectButton = Vec3b(0, 0, 250);
               cout << "Select Left Elbow ROI\n" << endl;
               rectangle(drawRect, button->leftElbow, selectButton, 5, 8, 0);
           }
       imshow("Label Tool", drawRect);
     }
   }
   

DISCLAIMER

Correct me if I am wrong but a glimpse into OpenCV High GUI shows that they do not provide a way of hiding created GUI elements. This means that the lastSelectedBtn.hidden lastSelectedBtn->hidden = true logic part will have to be done at the OS level.

With your current code snippet, you are simply drawing a rectangle over a selected button. To achieve what you want, two things are needed:

1. Have a global button object/variable which keeps track of the last selected button/rectangle. button. For this example, let's call it lastSelectedBtn

2. Your callback manipulation will look like this

   void callBackFunc1(int event, int x, int y, int flags, void* userdata)
   {
       Buttons* button = (Buttons*)userdata;
       Vec3b selectButton;
   
       if (event == EVENT_LBUTTONDOWN)
       {
           if (button-> leftHand.contains(Point(x, y)))
           {
               lastSelectedBtn->hidden = true; // hide the last selected button
               lastSelectedBtn = button; // update it to the recently selected button
               selectButton = Vec3b(0, 0, 250);
               cout << "Select Left Hand ROI\n" << endl;
               rectangle(drawRect, button->leftHand, selectButton, 5, 8, 0);
           }
           else if (button->leftElbow.contains(Point(x, y)))
           {
               lastSelectedBtn->hidden = true; // hide the last selected button
               lastSelectedBtn = button; // update it to the recently selected button
               selectButton = Vec3b(0, 0, 250);
               cout << "Select Left Elbow ROI\n" << endl;
               rectangle(drawRect, button->leftElbow, selectButton, 5, 8, 0);
           }
       imshow("Label Tool", drawRect);
     }
   }
   

DISCLAIMER

Correct me if I am wrong but a glimpse into OpenCV High GUI shows that they do not provide a way of hiding created GUI elements. This means that the lastSelectedBtn->hidden = true logic part will have to be done at the OS level.