sbr opened the ticket and wrote:

This patch allow to change the selected item of a dropdown by using the mouse wheel over the WWT_DROPDOWN button.

Two new functions are defined in src/widgets/dropdown.cpp:
- void ScrollDropDownList(Window *w, DropDownList *list, int selected, int button, int wheel)
- void ScrollDropDownMenu(Window *w, const StringID *strings, int selected, int button, uint32 disabled_mask, uint32 hidden_mask, int wheel)

They are used in the same way that the existing ShowDropDownList(...) and ShowDropDownMenu(...) but inside the OnMouseLoop(int wheel) handler of windows.

The list are scrolled one item at a time whatever scroll step is defined. Also list looping isn't supported: if one of the ends of the list is reached, following mouse wheel in the same direction are ignored.

The first attached patch defines the scrolling functions.
The second attachment is a tar of patches that use these functions on almost all WWT_DROPDOWN used in the guis.

Attachments

• mouse-wheel-scrolls-dropdown-list_r19257.patch (5.50 KiB)
• mouse-wheel-scrolls-dropdown-list_r19257_uses-in-guis.tar (50.00 KiB)

Reported version: trunk
Operating system: All

This issue was imported from FlySpray: https://bugs.openttd.org/task/3644