GWT - Datagrid : Keyboard single selection, when multi selection is enabled

Question

When I enable keyboard selection policy and multi selection on DataGrid I encountered this problem.

Case 1 : Multi selection through mouse and keyboard

When I want to select more than one row through mouse, I hold Ctrl key or Shift key and this works fine. Through keyboard by default, this action is provided by spacebar. When I want to select serially through keyboard combination of shift key and spacebar does the trick.

Case 2 : Single selection through mouse and keyboard (This is where the problem starts)

When I want to select a single row through mouse, I just do a left click. If I don't hold either of ctrl of shift key and do a left click, even if the multiple rows are selected, it will get deselected and only the current row gets selected. This is the expected behavior and I don't have any issue with it.

But the same thing is not achievable through keyboard. There is no way to select a single row through keyboard. If I press spacebar a row gets selected and if I press the spacebar again on some other row without shift/ctrl key, it gets multi selected and previous selected row doesn't get deselected.

My question is : How to achieve single selection through keyboard similar to that of mouse?

EDIT : I opened this issue in gwt issues. I hope they respond to this.

Answer 1

You have to use a custom selection event manager whose translator returns the appropriate value for the behavior you want from clearCurrentSelection.

The default behavior is to always add/remove from selection from the keyboard, and use the control or meta key to toggle whether to clear the current selection when using the mouse.