How to use a pushbutton in a loop in GUI matlab

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Kavindu Herath
Kavindu Herath 2019-1-8
回答： Luna 2019-1-9
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

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回答（1 个）

Luna
Luna 2019-1-9
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

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