You should have a look at previous posts from Seth, there is an example that exactly address this question:

http://blogs.mathworks.com/seth/2008/08/13/dynamic-mask-dialogs/

For example, I would like to have a popup, whichs offers the choice between different parameter files I can load for the block. Now, I don’t want to alter the popup manually everytime I add a parameter-file to the list in the library block but rather scan a folder containing the files and create the popup list accordingly. Whenever I try something like this in the dialog callback with
set_param(blk,’MaskStyles’,list)
the dialog is closed automatically with a warning that a mask parameter has been changed.

Any suggestions/ideas on how to solve this problem?

Thanks

Thanks and Regards
Mahmood

@Ashish - This is an excellent tip and a very clear example. I’m sure I will be using that in the future.

@Hans-Werner - The hidden/visible state of a mask widget is controlled by the MaskVisibilities parameter. It uses a cell array of ‘on’/'off’ values to control your mask. Try:

get_param(blk,’MaskVisibilities’)

The method I have used to set values of one popup based on another also involves MaskVisibilities. This only works if you have a small number of groups to switch between. Create a separate popup for each group and make the appropriate popup that corresponds to that group visible, and all the alternatives invisible. The programming gets very complicated to do it this way. The other option is to build your GUI using GUIDE and replace the OpenFcn for the block.

>> pos.template_orig = template_orig;
>> pos.template_size = template_size;
>> pos.search_border = search_border;

Both template_size and search_border affect the size of Simulink connections (wires). Simulink requires fixed size connections during runtime, therefore this information must be gathered prior to running the model.

template_orig provides location information. It does not affect wire size, therefore it can be set dynamically during runtime. Although the Stabilization demo doesn’t show you how to do it, it’s possible to turn the mask input into a port to the Stabilize subsystem.

Witek

% uplimsrc_cb Dialog Callback
function uplimsrc_cb(blk)

UPPER_LIM_SRC = 1;
UPPER_LIM = UPPER_LIM_SRC + 1;
LOWER_LIM_SRC = UPPER_LIM + 1;
LOWER_LIM = LOWER_LIM_SRC + 1;

en = get_param(blk,’MaskEnables’);

switch get_param(blk,’uplimsrc’)
case ‘external’
en{UPPER_LIM} = ‘off’;
case ‘internal’
en{UPPER_LIM} = ‘on’;
otherwise
disp(’Should never get here’)
end

set_param(blk,’MaskEnables’,en);

This comes in very handy for masks with a large number of parameters and also if you need to add / remove a parameter from the mask.

Ashish.

Thanks