Is there a known issue with drop down menus?

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Is there a known issue with drop down menus?

Postby darbid » Fri Feb 01, 2019 11:19 am

I am using CefSharp and recently posted a question on SO https://stackoverflow.com/questions/54341343/is-there-a-known-issue-with-drop-down-menus-in-cefsharp-wpf?noredirect=1#comment95598246_54341343.

While running cefclient with the following
Code: Select all
cefclient --multi-threaded-message-loop --off-screen-rendering-enabled --enable-gpu
I notice a strange behaviour with dropdown lists. If you scroll while they are open then the list just closes without a choice.

I understand that this is not a CefSharp issue but an issue with CEF itself.

Is this know? Or should I be posting elsewhere an issue?
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Re: Is there a known issue with drop down menus?

Postby magreenblatt » Fri Feb 01, 2019 11:28 am

How are you scrolling? Is the mouse cursor over the dropdown menu while you're doing it?
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Re: Is there a known issue with drop down menus?

Postby HarmlessDave » Fri Feb 01, 2019 1:10 pm

Are you sure this isn't a Google / Chromium issue? It's easy to move the mouse pointer slightly off the dropdown, which causes Chromium to close it.
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Re: Is there a known issue with drop down menus?

Postby darbid » Fri Feb 01, 2019 1:38 pm

I tested it with for example this site. http://www.globalsqa.com/demo-site/sele ... down-menu/

With the args I posted if you open the list, have your mouse pointer over the list and simple scroll your mouse you will see what I mean. The behaviour is totally different without the args and if it is important how Google Chrome handles it.
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Re: Is there a known issue with drop down menus?

Postby magreenblatt » Fri Feb 01, 2019 1:48 pm

To be clear, you’re scolling using the middle mouse wheel?
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Re: Is there a known issue with drop down menus?

Postby darbid » Fri Feb 01, 2019 2:06 pm

magreenblatt wrote:To be clear, you’re scolling using the middle mouse wheel?

I have never had a mouse with multiple wheels.
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Re: Is there a known issue with drop down menus?

Postby magreenblatt » Fri Feb 01, 2019 3:09 pm

darbid wrote:
magreenblatt wrote:To be clear, you’re scolling using the middle mouse wheel?

I have never had a mouse with multiple wheels.

Shall I take that to mean “yes”?
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Re: Is there a known issue with drop down menus?

Postby darbid » Fri Feb 01, 2019 3:18 pm

magreenblatt wrote:
darbid wrote:
magreenblatt wrote:To be clear, you’re scolling using the middle mouse wheel?

I have never had a mouse with multiple wheels.

Shall I take that to mean “yes”?

1. start cefclient --multi-threaded-message-loop --off-screen-rendering-enabled --enable-gpu
2. navigate to for example http://www.globalsqa.com/demo-site/sele ... down-menu/
3. see the little arrow pointing down in the darker grey box?
4. click that with your left mouse button.
5. now move the hand that is holding your mouse to the right and Up/down to the list of counties that just popped open.
6. now using the MIDDLE wheel in case you have a choice of wheels, scroll in a direction.
7.once the scroll stops the popped list will close automatically.

For the people confused with which mouse wheel to scroll here is a video https://youtu.be/WbNuZBAhAhU
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Re: Is there a known issue with drop down menus?

Postby magreenblatt » Fri Feb 01, 2019 3:27 pm

Thanks for the detailed reproduction steps.
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Re: Is there a known issue with drop down menus?

Postby darbid » Sat Feb 02, 2019 2:22 am

I think I understand the "mouse wheel" comment now. The behaviour only happens when you scroll with the wheel. It does not happen when you scroll by using the scroll bar.
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