Add 'clickFilterBehavior' to base-mixin to allow ctrl-click joins

[bloer]

The clickFilterBehavior option is intended for ordinal charts, bubble charts, pie charts, etc, i.e., those where clicking on an svg node filters to that node. I have not tested what would happen if a user tried to enable on a brush filter for example.

.clickFilterBehavior has 4 modes:

• "replace": The clicked node replaces the current filter list. Note that it is not possible to remove the filter in this case without a reset link.
• "toggle": Filtering for the clicked node is toggled from its current state. Therefore, if no filters are applied, clicking a node will filter all but that node (by applying an inverse filter under the hood).
• "replaceThenToggle": This is the current behavior. If there are no filters applied, act as 'replace'. If there is one ore more filter applied, act as 'toggle'.
• "replaceCtrlToggle": This acts like selecting graphics objects in e.g. PowerPoint. Left-click acts as 'replace', and ctrl-click acts as 'toggle'.

[gordonwoodhull]

This is a great idea! Would you consider writing some tests?

[bloer]

I'm extremely new to this -- wasn't even aware that it would be possible to write tests for onClick behavior. I'll see if I can come up with something useful next week.

[nisha0809]

How do I make 'reset' work here??

[Mavlarn]

So what's the status of tis pr?