How to get the new value of a changed mask parameter in the dialog callback?

11 次查看（过去 30 天）

Christian 2013-5-29

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/77343-how-to-get-the-new-value-of-a-changed-mask-parameter-in-the-dialog-callback

Hello, I am using Matlab R2011a. I have created a subsystem and masked it. There is a popup parameter in my mask and I have added a dialog callback to handle some things when the user changes the popup selection. At the moment, it seems as if in the dialog callback, when getting the value of the popup parameter with get_param(gcb,<parametername>), the old value is returned. Is there a way to get the current value of it?

Thank you,

Christian

0 个评论
显示 -2更早的评论隐藏 -2更早的评论

请先登录，再进行评论。

请先登录，再回答此问题。

采纳的回答

Kaustubha Govind 2013-5-29

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/77343-how-to-get-the-new-value-of-a-changed-mask-parameter-in-the-dialog-callback#answer_87025

I think you need to just use the 'parametername' directly since it exists as a variable in the Mask workspace. Does that work?

8 个评论
显示 6更早的评论隐藏 6更早的评论

Christian 2013-6-14

编辑：Christian 2013-6-14

在 MATLAB Online 中打开

I was able to create a very basic model which behaves as described. While reducing the block complexity, I detected that the block is a bit special and maybe this causes the problem: The block dialog is not opened with the usual double-click, but instead, the OpenCallback of the block is used:

bl_o=get_param(gcb,'object');
dlg=DAStudio.Dialog(bl_o.getDialogSource);
dlg.show;

This is because in the original block, a lot of other stuff is done in the OpenCallback and therefore, the mask dialog needs to be opened like this.

Now, I have this mask parameter 'param1' (popup) and the following DialogCallback:

value = get_param(gcb,'param1');
disp(value);

When I open the mask dialog and change the value, it always shows the old value. Furthermore, when I click OK to close the dialog and open it again, the parameter has the old value again.

Is this intended behaviour?

I will also send this model to the Mathworks Support.

Thank you.

Kaustubha Govind 2013-6-14

Christian: It looks like the Open callback is creating a new dialog (using DAStudio.Dialog). You can see this by running the same code from the command window on let's say, a Constant block in a model. You'll see that dlg.show opens a dialog, but when you double-click on the Constant block, there is a second dialog window opened. So, essentially, it is physically separate from the Mask dialog, which is why the callback is not getting the right values. I'm not sure how this new dialog interacts with the Mask dialog and invokes the right callback though. I think this problem is beyond my expertise, so I would recommend waiting to see what Tech Support recommends.

Christian 2013-6-14

在 MATLAB Online 中打开

Thank you for mentioning that the Open Callbacks opens another instance of the mask dialog. This is correct and it brought me to a solution finally:

t = DAStudio.ToolRoot;
dv = t.getOpenDialogs;
value = dv(1).getWidgetValue('Parameter1')

This will give me the current value of param1. The argument passed to getWidgetValue is NOT the name of the mask variable, but the prompt of it, as defined in the mask. Thanks a lot for your support.

请先登录，再进行评论。