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jason
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How can I programmitcally "click" on a block mask action button?

Asked by jason
on 10 Feb 2016
Latest activity Answered by TAB
on 30 May 2018
I have a Simulink block which is masked. The mask contains an action button which will modify the block contents when "clicked". I need to be able to script the clicking of the button for all instances of the block. Since this block will be linked to a library the modification has to occur with in the Mask's workspace.
I've looked at the Simulink.Mask and DialogControl objects, but there is no method to envoke the button's callback, only 'get' the callback code as a string.
Is what I'm trying to do possible, and if so how?
>> errMask = Simulink.Mask.get(gcb)
errMask =
Mask with properties:
Type: 'Set_Error'
Description: '<p><font size=+3 color="#990000">Set Error</font></p>
<p></p>
<p>This block sets the system error status for the error specifi...'
Help: 'web('sfun_Set_Error_help.html', '-helpbrowser');'
Initialization: ''
SelfModifiable: 'on'
Display: 'disp(['Set Error' char(10) char(10) err_id]);'
IconFrame: 'on'
IconOpaque: 'on'
RunInitForIconRedraw: 'off'
IconRotate: 'none'
PortRotate: 'default'
IconUnits: 'autoscale'
Parameters: [1x1 Simulink.MaskParameter]
BaseMask: []
>> errBtn = errMask.getDialogControl('update_btn')
errBtn =
Button with properties:
Name: 'update_btn'
Prompt: 'Update'
Callback: 'set_error_data_stores(gcb);
disp('hello');'
FilePath: ''
Row: 'current'
Enabled: 'on'
Visible: 'on'
>> errBtn.Callback
ans =
set_error_data_stores(gcb); disp('hello');

  1 Comment

Hi Jason,
Were you able to solve the problem? I am also trying to do the same thing.
Thanks, Nirav

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2 Answers

Answer by Arnab Sen
on 22 Feb 2016

Hi Jason, I understand that you would like to execute the callback programmatically.
You can use the 'evalin' function to achieve this goal as follows:
>>evalin(workspace,errBtn.Callback)
For more details refer to the following link:

  1 Comment

Doesn't evalin only use either the 'base' or 'function' workspace? What if I need it to run in the mask's workspace?

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Answer by TAB
on 30 May 2018

In my understanding, Dialog Control callback is not executed in Mask workspace.
It is executed in Base workspace. Even though it is not documented explicitly, you can easily check this yourself:
  • Create a simple mask with a button and few mask parameters.
  • Now try to access a mask parameter in button callback. Eg. fprintf('Mask Param Val = %f', MyMaskParam); When you press the button you will get error.
  • Now try opposite. Print base workspace variable and it will work.
So in your case, you can call set_error_data_stores(gcb) from any in script/function to emulate the button press.

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