c# - ScintillaNET 2.2 – Dropdown Not Showing Until Resizing Window in .NET 4.8 - Stack Overflow

admin管理员组

文章数量:1348224

I'm working on an old C# .NET 4.8 project for my company. It uses ScintillaNET 2.2.7895.17875 to create a custom code editor.

There's a dropdown arrow (highlighted in red in my attached image) that displays a list of open documents. When I select a file name from the list, the corresponding file is displayed. However, sometimes this arrow does not appear until I resize the window, after which it becomes visible.

I can't find the code responsible for this dropdown how it retrieves the list of files and I also need to investigate why the arrow sometimes fails to display properly.

Does anyone have any ideas on where to look or how to fix this issue? Any help would be greatly appreciated!

I'm working on an old C# .NET 4.8 project for my company. It uses ScintillaNET 2.2.7895.17875 to create a custom code editor.

There's a dropdown arrow (highlighted in red in my attached image) that displays a list of open documents. When I select a file name from the list, the corresponding file is displayed. However, sometimes this arrow does not appear until I resize the window, after which it becomes visible.

I can't find the code responsible for this dropdown how it retrieves the list of files and I also need to investigate why the arrow sometimes fails to display properly.

Does anyone have any ideas on where to look or how to fix this issue? Any help would be greatly appreciated!

• c#
• winforms
• -4.8
• legacy-code
• scintillanet

Share Improve this question Follow edited 2 days ago PépéMax asked Apr 2 at 8:53 PépéMaxPépéMax 1344 bronze badges

Add a comment  | 

3 Answers 3

Sorted by: Reset to default 0

This dropdown behavior is likely managed by a TabControl or a custom tabbed document manager within your application. Here are some areas to investigate:

1-Check TabControl Properties:

If you're using a TabControl, check if SizeMode is set to Fixed or FillToRight, as this can affect how the dropdown appears.

Look for TabControl properties like DrawMode, Padding, and Multiline that might be affecting the display.

2-Event Handling for Window Resizing:

If resizing triggers the dropdown to appear, the control might not be refreshing correctly. Look for Resize or Layout event handlers where the tab control is refreshed (Invalidate(), Refresh()).

3-ScintillaNET or Custom UI Code:

Since you’re using ScintillaNET, there might be a custom tab manager handling open documents. Check for any Scintilla or related UI event handlers that modify the tab behavior.

4-Force a Refresh When a Tab is Added:

If new tabs are being added dynamically, make sure the control is properly updated. Try manually forcing a redraw when a new tab is added:

tabControl.Invalidate();

tabControl.Update();

5-Debugging Strategy:

Set breakpoints in places where tabs are created, removed, or refreshed.

Try manually calling tabControl.Refresh() after adding tabs to see if it immediately triggers the dropdown.

This looks like the old WeifenLuo.WinFormsUI.Docking control. It seems to be maintained here these days.

You have few options:

• Check if your issues are already reported or fixed in the repo. Try to migrate to a newer DockPanelSuite version if that's the case. This might be a lot of work if DockPanelSuite API changed significantly. Try a newer version that is close to the one your project is using first to minimize the potential migration work.
• Checkout the corresponding source code that your App is using from the repo history and try to fix it yourself. This means you won't have to migrate your code but you will have to dive into an unknown codebase which you may not want to do.
• Try to find a workaround such as manually refreshing the dock panel control like @wael-ltifi described.

As a side note Scintilla.NET came a long way from the old v2 days where you had to deal with UTF-8 <-> UTF-16 position mapping yourself, and is actively maintained here. (Disclaimer: I'm one of the maintainers)

Well, I got the idea from Wael Ltifi to resize my window when opening my component.

I know it's not a clean solution at all, but given the urgency and the fact that I'm not a C# expert, it's the only workaround I could find.

I added this code right after opening my editor.

var window = this;
bool isMaximized = window.WindowState == FormWindowState.Maximized;

if (isMaximized)
{
    window.WindowState = FormWindowState.Normal;
    window.Width -= 10;
    window.Width += 10;
    window.WindowState = FormWindowState.Maximized;
} else
{
    window.Width -= 10;
    window.Width += 10;
}

本文标签： cScintillaNET 22 – Dropdown Not Showing Until Resizing Window in NET 48Stack Overflow