Box select a set of nodes

[forresto]

Since we can pan the graph with two-fingers #34 (mousewheel scroll event and multitouch), dragging on the background should draw a selection box to select multiple nodes.

[bergie]

That doesn't sound like a bad idea, assuming that we can disambiguate this from the other background gestures like scrub to delete or draw box to add a node

[forresto]

A threshold should feel better here than it did with panning, since we're not expecting anything to move immediately.

Are there systems without mousewheel events? (They could still navigate by dragging the minimap.)

[bergie]

@forresto you mean systems without a mouse wheel & without a multi-touch screen? Sure there are, but I suppose that isn't a big number in our target audience. And as you mentioned, they can navigate with the minimap.

We could possibly even try to detect these two things (touch capability and mouse wheel availability), and lacking those show small arrow buttons near the map.

Or maybe just do keybinding to arrow keys?

[bergie]

This also affects #58

[bergie]

As described in noflo/noflo-ui#28, this is a place where we may have to provide different behavior for mouse and touch:

• On touch, tapping a node selects it and keeps also the previous nodes selected. Tapping any of them unselects.
• On mouse you can select a set of nodes either by:
  • Ctrl-Clicking them one by one
  • Selecting them with a "lasso" or selection box

[forresto]

to do: meta+drag for selection rectangle

[bergie]

The selection pseudo-group should capture contextmenu when active. So when you tap-and-hold or right click anywhere in the group you should get the menu for that group.

This can include actions like "move to subgraph", "group/ungroup", and even "delete". But those will be implemented in the NoFlo UI