A table/grid widget for druid ( the rust widget library). WIP. This project was to learn rust.

• Virtualized rows and columns, ie data does not have to reside in memory and there is nothing stored per row/column/cell (if fixed sizes are used).
• Custom cell and header rendering
• Columns can be static or data derived
• Selections (single cell + row & column) with keyboard control
• Sorting (multi column, asc/desc) - up front specified right now. Interactive by double clicking in column headers (CTRL for multi select).
• Trait based design for customisation (and possible monomorphisation benefits) :
  • Data sources:
    • Currently im::Vector is supported out of the box.
    • The interface works for both virtualized and concrete data sources by reference. Minimum copying required.
  • Columns:
    • The default configured columns that are boxed onto the heap, allowing composition. Columns can be adapted with lenses or functions (to pull fields out of your row type).
    • Implement your own "CellsDelegate" if configuration up front won't work - for example deriving columns from the data (DB result sets).
  • Axes:
    • The default AxisMeasures allow user driven column resizing - right now this takes up O(n) memory in items on that axis.
    • The FixedAxisMeasure stores no data, so is better for huge virtual tables. See examples/bigtable - tested on a quintillion cells!

Planned:

• Fuller configuration (improved builder)
• Filter
• Pushdown of sort and filter (eg db backend)
• Column and row pinning
• Editing
• Selection/ clipboard
• WASM / + JS wrapper (aspirational)
• Support slow data sources (loading)
• Support fast data sources (ticking)

Later:

• Reduce memory usage of resizable columns to O(n) in the number of columns resized
• Aggregation (w/push down)
• Pivoting (w/push down)
• Tree view - not sure if this is just a weird column that hides rows

Much later:

• More optimised data representations for large in memory datasets - possibly MVCC and columnar. Maybe an add on.

Requires my own druid fork until 1108 is merged

This shows it in action and also a bug where the header resize continues when leaving the widget. Thats been fixed!

Can be considered for inclusion when its a bit further along.