implement UiWidgetListTable

[hohwille]

UiWidgetListTable is to be implemented. This will be tough especially for web (GWT). We have to consider the following requirements:

• Support for scrolling tbody vertically as needed and the entire table horizontally.
• Ability to scale the size of the entire table with the available size (without javascript layout managers)
• Abilitly for the user to sort by column (via clicking on column header)
• Ability for the user to resize columns (with e-resize cursor on the fly by dragging the right border of the column)
• Ability for the user to reorder columns with drag and drop via column header
• Ability for inline editing
• Ability for multiple selection with checkboxes
• Keyboard support to step through the column headers and cells with cursor keys
• Accessibility support via WAI-ARIA
• For large datasets it may be required that we only render the visible part and update lazily while scrolling

[hohwille]

Great progress after long fight with HTML(5) and CSS. Now working:

• list table with column model
• tbody scrollable
• columns resizable
• columns sortable
• showing of sort order via CSS icon
• content of columns is clipped when to narrow using text-overflow: ellipsis
• setting min/max width for column honored by resizing

Still lots of things to do:

• inline editing (should be quite easy to implement now)
• hover text for headers and cells to show full text (useful if clipped), configurable via API
• grouping of headers
• tab/focus management for keyboard control
• horizontal scrolling
• tfooter support including summary functions
• accessibility/aria support for screenreaders
• special features (all cells editable, custom editor e.g. via Popup, custom styles for cells, etc.)