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Thread: How to handle the message ON_EN_CHANGE for a read only CEdit?

Started 1 month, 1 week ago by dullboy

I tried to add a function to handle the message ON_EN_CHANGE for a read only CEdit control but the function is never being called no matter what. I guess it might be related to read only property of this CEdit control. So I wander is there any way to handle ON_EN_CHANGE message for a read only CEdit control? Thanks for your inputs.

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Forum:	Visual C++ Programming
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Reply 1: How to handle the message ON_EN_CHANGE for a read only CEdit?

GCDEF replied 1 month, 1 week ago

How are you envisioning a read only edit changing?

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Reply 2: How to handle the message ON_EN_CHANGE for a read only CEdit?

dullboy replied 1 month, 1 week ago

Actually, this read only edit control is associated with a member data and the member data is updated due to some logic. With the help of DDX, text on the read only edit control will also be updated. Whenever there is change on the read only edit control, I expect to capture an event. Right now it looks like I could capture the ON_EN_CHANGE event. Hopefully I make myself clear. Thanks for your...

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Reply 3: How to handle the message ON_EN_CHANGE for a read only CEdit?

Arjay replied 1 month, 1 week ago

I doubt there is any built-in event you can grab. As you know OnEditChange only gets fired when a user enters text into the edit box. For your use, if I'm not mistaken, you can write a custom ddx entry which will get called when the ddx mechanism fires. Inside the custom entry handler you can compare the edit box contents with that value that is about to update it. If the values don't ...

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Reply 4: How to handle the message ON_EN_CHANGE for a read only CEdit?

dullboy replied 1 month, 1 week ago

What you suggested works! Thanks a lot for your help. Quote: Originally Posted by Arjay I doubt there is any built-in event you can grab. As you know OnEditChange only gets fired when a user enters text into the edit box. For your use, if I'm not mistaken, you can write a custom ddx entry which will get called when the ddx ...

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Reply 5: How to handle the message ON_EN_CHANGE for a read only CEdit?

JohnCz replied 1 month, 1 week ago

I was confused reading this post thinking if it should be here or in some other forum (C#?). Quote: Originally Posted by dullboy . . .handle the message ON_EN_CHANGE for a read only CEdit control. . . might be related to read only property. . . Property as used in some languages like C# or other, property is ...

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Reply 6: How to handle the message ON_EN_CHANGE for a read only CEdit?

Arjay replied 1 month, 1 week ago

John, you are correct. I was a bit laxed in my use of the term 'event'. We are talking about a windows message here. On the other hand, Windows is considered to be an event based OS, so windows messages actually are considered to be events. Still, it's probably best to keep the two separate.

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Reply 7: How to handle the message ON_EN_CHANGE for a read only CEdit?

JohnCz replied 1 month, 1 week ago

Hi Arjay, please do not take my post it as criticism of yours. This is happening everywhere in this forum and others. I wrote it as general remark. Again my POCDS. I think you are right; it is better to keep it separate. Event to my understanding is something that happens, given time and place (happening). Window is a message driven OS. When mouse button is clicked - hardware event, ...

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Reply 8: How to handle the message ON_EN_CHANGE for a read only CEdit?

Arjay replied 1 month, 1 week ago

Np, John. Microsoft probably changed the naming to be more like the .net events since they are reusing the IDE.

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Reply 9: How to handle the message ON_EN_CHANGE for a read only CEdit?

JohnCz replied 1 month ago

That is exactly what I thought. As usual in many cases by changing something, MS creates a mess and confusion.

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