DKDrawingView(DropHandling) Category Reference

Drag and Drop is extended down to the layer level by this category. More...

Instance Methods
(DKLayer *)	- activeLayer
	Returns the current active layer, by asking the controller for it. More...

Detailed Description

Drag and Drop is extended down to the layer level by this category.

Author

Contributions from the community; see CONTRIBUTORS.md

Date

2005-2015

Copyright

MPL2; see LICENSE.txt

Drag and Drop is extended down to the layer level by this category. When a layer is made active, the drawing view will register its pasteboard types (because this registration must be performed by an NSView). Subsequently all drag/drop destination messages are forwarded to the active layer, so the layer merely needs to implement those parts of the NSDraggingDestination protocol that it is interested in, just as if it were a view. The layer can use [self currentView] if it needs to access the real view object.

Note that if the layer is locked or hidden, drag messages are not forwarded, so the layer does not need to implement this check itself.

The default responses to the dragging destination calls are NSDragOperationNone, etc. This means that the layer MUST correctly implement the protocol to its requirements, and not just "hope for the best".

Method Documentation

- (DKLayer*) activeLayer

Returns the current active layer, by asking the controller for it.

DKDrawing maintains the active layer - look there for a method to set it

Returns

a layer, the one that is currently active

Extends class DKDrawingView.