About this Add-on
Unfortunately, Mozilla has recently made it very difficult to continue supporting many extensions. These changes have been made in the interest of improving security, but at the cost of making it much more difficult to extend the interface.
This guide (https://developer.thunderbird.net/add-ons/tb68/overlays) suggests that newer versions of Thunderbird may have restored support for the old "overlay" extensions (like Gantt View), but also says that extensions can't access overlays in other extensions (like Lightning). Since Gantt View is really an extension of an extension, I don't think I can make it work unless I can somehow get it integrated as a core feature of the lightning extension.
I'd like to get it working again if possible, since I use it myself! But I don't know when I'll be able to do this.
Joe Brochu, 2020-01-22
****
A Gantt Chart view for Sunbird/Lightning. It is built from the same core components as the standard views and is generally designed to integrate seamlessly with the existing views and controls.
Features:
- Selectable visible date range up to 2 years - although longer ranges may reduce performance.
- Intuitive Item selection, Drag/Drop, and view panning
- Select multiple events by dragging with a left-click
- All selected events manipulated in the same way when one is dragged
- Pan view with Middle-click
- View will auto-scroll when cursor is near an edge while dragging or panning. This is configurable in the preferences.
- When clicking on an event header (at the left side of the view), the view will automatically scroll to the start of that event.
- Optional progress bar displays on Tasks and Events (Event progress is determined by current time)
- Title Ordinal Override - Allows manual sorting of items using a number at the start of the title. See documentation here.
- Quickly create a week-long or month-long event by double-clicking the week or month header
- Completed tasks and events shown with strikethrough
- "Completed" icons on tasks in view
- Uses prefs such as "Hide Days Off" and "First Day Of Week" from main calendar options.
- Current Day, Week, and Month highlighted.
- Localizable
Please see http://ganttview.mozdev.org for more details and bug reporting
NOTE - Version 1.0.0.0b7 is available here.
This version fixes the incorrect week numbers and introduces a japanese locale. It is currently awaiting a full review and will appear on the main page once the review is complete.