The FamilyTreeView addon (like several Charts views) supports the mouse scroll wheel. But only for zoom. Unfortunately, there are no standards for modifiers and mouse button actions in Gramps charts.
FamilyTreeView addon
| modifier | Left | Center | Wheel | Right |
|---|---|---|---|---|
| none | show details |
show details |
zoom in/out |
no action |
| Shift | modifier ignored |
modifier ignored |
modifier ignored |
no action |
| Ctrl | modifier ignored |
modifier ignored |
modifier ignored |
no action |
| Alt | modifier ignored |
modifier ignored |
modifier ignored |
no action |
| press and drag |
✥ | ✥ | ✥ | no action |
Suggested actions
| modifier | Left | Center | Wheel | Right |
|---|---|---|---|---|
| none | show details |
show details |
scroll |
context menu |
| Shift | modifier ignored |
modifier ignored |
scroll ↔️ |
no action |
| Ctrl | modifier ignored |
modifier ignored |
zoom ± |
no action |
| Alt | modifier ignored |
reset zoom re-center |
reset zoom re-center |
no action |
| press and drag |
✥ | zoom marquee |
zoom marquee |
no action |
The Timeline Pedigree View addon Charts view mode has a Shift Scrollwheel modifier to shift from horizontal to vertical scrolling. It chooses a somewhat counter-intuitive behavior. Since the progression of data is horizontal, the developer choose to make the unmodified scroll also horizontal. And oddly for a language read left-to-right, the upwards wheel roll scrolls leftwards… reverse of what would naturally follow. That’s more appropriate for languages read right-to-left. The shift modified wheel roll scrolls vertically. And, as expected, roll upwards will scroll upwards.
