Changing the DropdownButton Arrow Style

[Matthew Jones]

I have spent a considerable amount of time searching for an answer to this question, but have yet to find an answer. I am fairly new to Flutter, so I apologize if I'm missing something obvious.

My designer wants to customize the arrow on our dropdown buttons. So it should look something like this:

The issue is that I can't find anything in the documentation about how to do this. I've found discussions about changing the color of the default arrow, but not replacing it entirely. 

Is there a way of modifying the DropdownButton instance so it displays the custom arrow? If not, is there another class I can modify to make this work? I'd rather not try to build a custom dropdown widget from the ground up. 

Thanks!

- Matthew

[Matthew Jones]

Just an update... I found this:

https://github.com/flutter/flutter/issues/20686

Apparently, as of right now, there's no way to modify the DropdownButton class.  You can change the size of the default material down caret icon, but you can't replace it. 

If anyone knows a workaround it would be greatly appreciated.  

[Steven McDowall]

Work around -- grab the code for the DropDown and put it in your project and hack it to do what you want .. 

I did that with ExpansionTile when it didn't support something I needed (it has since) .. 

Just change the name to something like EXDropdownButton so not to conflate it with the original if/when they ever fix it should be easy to change them back .. 

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[Matthew Jones]

That seems like it would work. Thanks for the help!

[Steven McDowall]

If you create a nice generic enhancement -- you can even PR it back and get it officially added !  

[Matthew Jones]

I wrote the functionality in and sent a PR to the project. We'll see if it gets accepted...