Bug #13956: WPopupMenu not visible if popped up at itemWidget of (a narrow) WTableView with vertical scrollbar - Wt - Redmine

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Bug #13956

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WPopupMenu not visible if popped up at itemWidget of (a narrow) WTableView with vertical scrollbar

Added by Michael Seibt 7 months ago. Updated 11 days ago.

Status:

InProgress

Priority:

Normal

Assignee:

Romain Mardulyn

Target version:

Start date:

09/04/2025

Due date:

% Done:

Estimated time:

Description

WPopuMenu::popup(WWidget *location, orientation = Orientation::Vertical) seems to reparent the menu to some layout container if the WTableView has a vertical scrollbar.
This just results in the horizontal scrollbar becoming added and the popup menu being invisible until that scrollbar is moved. Unacceptable UX.
(If the WTableView does not have a vertical scrollbar, the menu uses the full height of the screen, i.e. is not restricted to and hidden in a container. Good.)

CSS path without vscrollbar: html.Wt-layout body.Wt-layout.Wt-ltr div#ojansmv.Wt-domRoot ul#ojaovc7.Wt-popup.DevSwitching.dropdown-menu.wt-reparented
CSS path with vscrollbar: html.Wt-layout body.Wt-layout.Wt-ltr div#ojansmv.Wt-domRoot div#ojansmx div#ojansnz.SystemSummary div#ojanso0.Wt-stack div#ojaothf div#ojaovbc.Wt-itemview.Wt-tableview.DevSwitching.wt-fixedc1.unselectable div#ojaovbw div#ojaovbn.tcontainer ul#ojaovc7.Wt-popup.DevSwitching.dropdown-menu.wt-reparented

Files

main.cpp (11.5 KB) main.cpp

Michael Seibt, 02/11/2026 05:06 PM

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Updated by Michael Seibt about 2 months ago

File main.cpp main.cpp added

High: Still reproducible with Wt 4.12.2 (and former versions, checked down to 4.11.4).

STR:

run attached main.cpp with reload-is-new-session = false
open http://127.0.0.1:8080
click "Popup menu"

--> WPopupMenu is not visible without scrolling. Just cell "42,1" is selected and the horizontal scrollbar of the left WTableView gets longer.

Popping up the menu with Orientation::Vertical (tick the checkbox) does not make it better - particularly if row 42 was not visible.
Then the context menu pops up above the - now top-visible - cell.

The layout gets totally messed up by

reloading the page (worse than before with Wt 4.12.2)
adding many menu items (button "Add many context menu items")

Most of this issues will be resolved if the context menu is not popped up inside that container - as it is done for the right WTableView (with less rows) if it has no scrollbar.

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