public static interface
Dragger.DragHandler
Interface for processing a drag behavior.
Public Method Summary
| abstract Runnable |
maybeGetDragGroupCreator(PendingDrag pendingDrag)
This method checks whether the pending drag maps to a valid draggable
BlockGroup
on the workspace. |
| abstract boolean |
Public Methods
public abstract Runnable maybeGetDragGroupCreator (PendingDrag pendingDrag)
This method checks whether the pending drag maps to a valid draggable BlockGroup
on the workspace. If it does, it should return a Runnable that will perform (at
a later time) the necessary Block and BlockView manipulations to
construct that drag group, and assign it to the PendingDrag. Such manipulations
must not occur immediately, because this can result in recursive touch events. The
Dragger is designed to catch these calls and forcibly crash. Just don't do it.
Runnable is called, it should proceed with the Block and
BlockView manipulations, and call startDrag(View, BlockGroup, ViewPoint) to
assign the draggable BlockGroup, which must contain a root block on the
Workspace and be added to the WorkspaceView.
If pending drag does not map to a draggable, this method should return null.Parameters
| pendingDrag | The pending drag state in question. |
|---|
public abstract boolean onBlockClicked (PendingDrag pendingDrag)
Handles click events on blocks.
Parameters
| pendingDrag | The pending drag state in question. |
|---|
Returns
- True if click was processed and event should be captured.