Improve drag/grab control with DragGrabFilter and DragCaptionProvider

jreznot commented 7 years ago

Introduced DragGrabFilter that can filter inner components of a container from "grabbing" on client-side. It enables us to disable dragging container by grabbing its inner components, e.g. we can prevent dragging of VerticalLayout if a user grabs inner Table.
Implemented DragCaptionProvider that can be used to show simple DOM element with icon and caption instead of copy of dragged component. DragCaptionProvider must return DragCaption POJO for each draggable component inside of a container.

See demos: DragdropDragCaptionDemo and DragdropDragGrabFilterDemo

Please review, will merge it next week it if there are no comments / issues

johndevs commented 7 years ago

Great features all around! Nice work :+1:

jreznot commented 7 years ago

I've introduced support of all ContentMode values for DragCaption. Hope it will be useful.

jreznot commented 7 years ago

Client-side error on mouse click is fixed too, was caused by VGrabFilter code

mstahv commented 7 years ago

Awesome, go ahead and land the change set!

parttio / dragdroplayouts