Change visibility of a Paramter Based on variant selected on a masked susbsystem

Hello All,

I have a variant subsystem with 2 Variants

1. Variant A
2. Variant B

The Variant is controlled by a Mask Parameter called VariantSelect.

In Variant A I have a parameter called TestParam

In Variant B I have a parameter called TestParam and TestParam2.

When I select a Variant A from masked susbsystem. I only want TestParam to be visible on the mask as the paramater.

When I select a Variant B from masked susbsystem. I only want TestParam and TestParam2 to be visible on the mask as the paramater.

My code in Callback of the mask

varObj = get_param(gcb, 'VariantSelect');
switch varObj
    case 'Variant A'
        maskObj = Simulink.Mask.get(gcb);
        maskObj.set('TestParam', 'Visible', 'on');
        maskObj.set('TestParam2', 'Visible', 'off');
    case 'Variant B'
        maskObj = Simulink.Mask.get(gcb);
        maskObj.set('TestParam', 'Visible', 'on');
        maskObj.set('TestParam', 'Visible', 'on');
end

The Selection of Variant works well but ,

Both the paramaters are shown all the time [if I check the visible Option in Parameter & Dialog --> Property Editor]

Please let me know, where it is going wrong

None of the paramaters are shown all the time [if I un-check the visible Option in Parameter & Dialog --> Property Editor]

Please let me know, where it is going wrong.

Answer 1

[Hitesh]

Hi Abhishek,

In the code you have shared, within variant B, Line9 and Line10 are identical that is "TestParam" is set to visible twice. It needs to be "TestParam2" to ensure "TestParam2" is also visible for variant B. Please let me know if the issue persists. Additionally, it would be helpful if you could share the model file so I can replicate the error on my end.

[Abhishek]

Hello Hitesh,

I fixed the code. Still the same issue

I will attachch the example model for you.

If I select Variant A [I do not want to see the Test paramater 2]

If I select Variant B[I want to see both test params]

[Hitesh]

Hi Abhishek,

The syntax for setting up the property for "maskObj" was incorrect due to which the "TestParam" was not correctly set. Additionaly it is not good practice to use "gcb" when you are writing callback function since it will return you current selected block. You need to use "BlockHandle" within the MaskInitialization callback function.I have attached the updated simulink file for your reference.

Kindly refer to the revised code:

function MaskInitialization(maskInitContext)
    varObj = get_param(maskInitContext.BlockHandle, 'VariantSelect');
    switch varObj
        case 'Variant A'
            maskObj = Simulink.Mask.get(maskInitContext.BlockHandle);
            maskObj.getParameter('TestParam').Visible = 'on';
            maskObj.getParameter('TestParam2').Visible = 'off';
        case 'Variant B'
            maskObj = Simulink.Mask.get(maskInitContext.BlockHandle);
            maskObj.getParameter('TestParam').Visible = 'on';
            maskObj.getParameter('TestParam2').Visible = 'on';
    end
end

For more information regarding "how to set the parameter in the function callback", kindly refer to the "Code Pane" section of following MATLAB Documentation:

https://www.mathworks.com/help/simulink/gui/mask-editor-overview.html#bu086do:~:text=for%20your%20system.-,Code%20Pane,-Initialization%20and%20Parameter

[Abhishek]

Hello @Hitesh,

I tried you code but for Variant B --> It only shows 1 parameter and not both.

Before it was showing Bothh para,eters, no matter what.

Now it shows only one parameter, no matter which variant I select.

Best regards,

Abhishek KUMAR

[Hitesh]

Hi @Abhishek,

I am getting the TestParameter1 on selecting "VariantA" and TestParameter1 and TestParameter2 on selecting "VariantB". I have attached the simulink model for your reference. I have attached the test_param_file also which will restore the Mask Editor's code that I have written.

Kindly refer to the following code that needs to written in Mask Editor's code tab:

classdef test_param_file
    methods(Static)
        % Following properties of 'maskInitContext' are available to use:
        %  - BlockHandle
        %  - MaskObject
        %  - MaskWorkspace: Use get/set APIs to work with mask workspace.
        function MaskInitialization(maskInitContext)
            varObj = get_param(maskInitContext.BlockHandle, 'VariantSelect');
            switch varObj
                case 'Variant A'
                    maskObj = Simulink.Mask.get(maskInitContext.BlockHandle);
                    maskObj.getParameter('TestParam').Visible = 'on';
                    maskObj.getParameter('TestParam2').Visible = 'off';
                case 'Variant B'
                    maskObj = Simulink.Mask.get(maskInitContext.BlockHandle);
                    maskObj.getParameter('TestParam').Visible = 'on';
                    maskObj.getParameter('TestParam2').Visible = 'on';
            end
        end
        % Use the code browser on the left to add the callbacks
    end
end