Prevent changing values in GUI

Question

Paramjit Yadav 2024-8-5，17:13

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/2143086-prevent-changing-values-in-gui

回答： Walter Roberson 2024-8-5，21:13

Dear firends,

I have a querry reagrding the GUI formation in MATLAB. I have made a GUI and everything is ok but the values of tab inside the listerner called as 'angle' can be changed with edit filed and slider, which has limit obj.angle = [-10,10].

During static code given below also I have made the condtion 'if (obj.angle ~= obj.angle) & obj.angle<10 & obj.angle>-10'. Hence the static code is not executed if the slider and editfield is out of range of given limit.

But the problem is if I go inside the angle.Value and write some number not in range or limit of angle then even though the static code is not excuted but the value inside angle.Value is updated and stored. I dont want this.

Hence, I request to please suggest some way by which I can prevent the value from being updated manually inside the angle.Value. And the angle.Value should have the same limit as it has when input is given through slider or edit field.

I request to please help.

Thanking all,

Kind regards

classdef classErowin < handle
    properties
        fig
        serial_port
        UI   
        angle
    end
    properties (SetObservable, AbortSet) % for listeners
        angle
    end
    
    methods
        function obj = class() % constructor
            obj.angle = [-10,10]
            edit_filed  
            slider
        end
    end
    
methods (Static)
        function handlePropEvents(src,evnt)
            obj = evnt.AffectedObject;
            switch src.Name
                case {'angle'}
                    if (obj.angle ~= obj.angle) & obj.angle<10 & obj.angle>-10
                    end
            end
        end
end
end

1 个评论
显示 -1更早的评论隐藏 -1更早的评论

VBBV 2024-8-5，20:07

在 MATLAB Online 中打开

@Paramjit Yadav you could try setting the default value for angle as empty inside the static function

 if (obj.angle ~= obj.angle) & obj.angle<10 & obj.angle>-10
     angle.Value = [] % set the value default value 
 end

请先登录，再进行评论。

请先登录，再回答此问题。

Answer 1

Walter Roberson 2024-8-5，21:13

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/2143086-prevent-changing-values-in-gui#answer_1494906

But the problem is if I go inside the angle.Value and write some number not in range or limit of angle then even though the static code is not excuted but the value inside angle.Value is updated and stored.

You need a set function https://www.mathworks.com/help/matlab/matlab_oop/property-set-methods.html#buq4ila-1