feat: timeslider scroll event updates bar position

[KartikWatts]

closes #2931

Description:

This pull request enhances the functionality of Widget_Timeslider by implementing scroll event updates. It achieves this by introducing repositioning of the timeline bar within the on_scroll_event method and updating the existing zoom functionality. Additionally, it enables smooth scrolling through the panel, adjusting based on the central position of the TimeModel. These updates significantly improve the user experience and enhance the overall usability of the Widget_Timeslider.

Changes:

• Implemented scroll event updates for Widget_Timeslider.
• Updated the zooming functionality hotkey as: ctrl + scroll.
• Added repositioning of the timeline bar within the on_scroll_event method.
• Enabled smooth panel scrolling, dynamically adjusting based on the central position of the TimeModel.

[yoSachinkr]

@KartikWatts I've just tested this PR. It's working perfectly. 🚀

[rodolforg]

Time zooming is also important.
This PR removes it.

Wouldn't be good to keep this previous feature with Ctrl + scrolling?

[yoSachinkr]

Wouldn't be good to keep this previous feature with Ctrl + scrolling?

@rodolforg ctrl+scroll works in the inside area of the timeline panel and I think it's consistent with ctrl+shift+scroll shortcut to zoom vertically in the graph panel as well.

[rodolforg]

So the timeslider could have it too, right?

• scroll: set time
• ctrl + scroll: zoom time view

[yoSachinkr]

So the timeslider could have it too, right?

• scroll: set time
• ctrl + scroll: zoom time view

It can have but I'm wondering is it really needed to have it on the timeline strip. 👀

[rodolforg]

@KartikWatts could you please re-add the old feature but now when user presses ctrl+scroll?

[KartikWatts]

Sure, I'll update the PR soon. Regards.

[KartikWatts]

@rodolforg @yoSachinkr Sorry for the delay. Updated the PR, keeping the zoom functionality now with ctrl + scroll. And timeline scrolling with scroll.

[KartikWatts]

Please note here, after some thought I kept the separate time representation for scroll and zoom functionalities.
As zooming would ideally remain unchanged when based on time_plot_data->get_t_from_pixel_coord but for scrolling I felt it better suited with time_model->get_time() as calculation based on actual timeline-bar position on panel, kindly let me know your thoughts.