How to use a pushbutton in a loop in GUI matlab

I create a small game I have used 2 push buttons(P and Q), have used a P push button for game start and after clicking that a "while loop" is started, when run that loop I want to use "if" condition, if I click Q button, How to determine Q button clicked or not when loop is running?

Thank you

[Adam]

Something like the attached works simply on the same idea.

Answer 1

[Luna]

Hello Kavindu,

I was working on the same topic as you asked above and I found a solution with some research.

I made a demo test GUI with 2 buttons.

When this kind of asynchronous programming needs to be performed(for example two different function running in the parallel universes:) ) it would be useful way to define a timer to periodically check if the event has been triggered or a button pressed, etc...

While loop can not be interrupted until the loop executed fully but timer function can.

classdef testGUI < handle
    
    properties
        StartButton
        StopButton
        MainFig
    end
    
    properties (SetAccess = private)
        timeCounter
        whileStatement
        trackingFlag = false;
    end
    
    events (ListenAccess = 'public', NotifyAccess = 'protected')
        StopButtonPressedEvent
    end
    
    methods
        % constructor method
        function obj = testGUI
             % figure and 2 pushbutton definitions
            obj.MainFig = figure('Name','TEST','units','normalized');
            obj.StopButton = uicontrol('Parent',obj.MainFig,'Style','pushbutton','String','Pause','units','normalized','Position',[0.2 0.2 0.3 0.3],'Callback',@obj.StopButtonCallback);
            obj.StartButton = uicontrol('Parent',obj.MainFig,'Style','pushbutton','String','Start','units','normalized','Position',[0.6 0.2 0.3 0.3],'Callback',@obj.StartButtonCallback);
            
            % while statement - will be used in timer function for loop control
            obj.whileStatement = true;            
            % event listener for stop button pressed 
            addlistener(obj,'StopButtonPressedEvent',@(src,evnt)StopButtonPressedListener(obj,src,evnt));
        end
        
        
        function StopButtonCallback(varargin) % this function triggers when StopButton pressed
            obj = varargin{1};
            obj.notify('StopButtonPressedEvent'); % Notify will send an event notification to every object that is 'listening'.
            
        end
        
        function StartButtonCallback(obj,source,event)
            % When start button pressed a timer is created and started
            obj.whileStatement = true;
            obj.trackingFlag = false;
            obj.timeCounter = timer('BusyMode', 'drop', 'ExecutionMode', 'fixedRate', 'Period', 0.1, 'TimerFcn', @obj.timerFcn);      
            obj.timeCounter.start();       % this executes Timer function callback
        end
        
        function StopButtonPressedListener(obj,source,event) % when obj notified by the event button pressed, this function executed.
            disp('stop');
            obj.whileStatement = false;
            obj.trackingFlag = false;
        end
        
        function timerFcn(obj,varargin) % timer runs with its given period like a while loop until stop function executed
            
            if obj.whileStatement
                if ~obj.trackingFlag %this checks tracking begins
                    obj.trackingFlag = true;
                    disp('tracking started');                  
                end
                              
                if obj.trackingFlag
                    disp('continue')
                else                   
                    stop(obj.timeCounter);
                    return
                end
                
            else
                obj.trackingFlag = false;               
                stop(obj.timeCounter);
                return
            end 
        end       
        
    end
    
end