druid_table

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:

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.

timothyhollabaugh / druid_table