| Subject: | Support horizontal scrolling from <MouseWheel> events |
Plenty of modern hardware supports horizontal scrolling, and it is also often possible to perform horizontal scrolling by holding shift while scrolling vertically. However, the scrolling support in Tk predates mice with scrollwheels, and as a result still often requires holding the middle mouse button, which is usually not possible on touchpads or other modern hardware lacking a middle mouse button. It would be useful for Tcl::pTk support horizontal scrolling from <MouseWheel> events, as long as existing programs don't already try to handle this.
It should be possible to support horizontal scrolling from <MouseWheel> events by using Tcl::pTk::Ev('s') (0 for vertical, 1 for horizontal) to invoke either yview() or xview(). A challenge similar to the previous ticket arises though, where it needs to be determined if a widget supports xview() before invoking it to prevent an error.
It should be possible to support horizontal scrolling from <MouseWheel> events by using Tcl::pTk::Ev('s') (0 for vertical, 1 for horizontal) to invoke either yview() or xview(). A challenge similar to the previous ticket arises though, where it needs to be determined if a widget supports xview() before invoking it to prevent an error.