blockly > dragging > BlockDragStrategy

dragging.BlockDragStrategy class

Signature:

export declare class BlockDragStrategy implements IDragStrategy 

Implements: IDragStrategy

Constructors

Constructor	Modifiers	Description
(constructor)(block)		Constructs a new instance of the BlockDragStrategy class

Properties

Property	Modifiers	Type	Description
BLOCK_CONNECTION_OFFSET	protected readonly	(not declared)
block	protected	BlockSvg
connectionPreviewer	protected	IConnectionPreviewer | null
moveMode	protected	MoveMode	The current movement mode.
startLoc	protected	Coordinate | null
WORKSPACE_MARGIN	protected readonly	(not declared)	How far in from the edges of the workspace to position newly placed blocks.
workspace	protected	WorkspaceSvg

Methods

Method	Modifiers	Description
cacheAllConnectionPairs()		Caches a list of all valid connection pairs between the dragging block and any other blocks on the workspace. This is used to determine the closest valid connection during keyboard-driven moves and to determine the need to disambiguate between multiple compatible connections when announcing moves to assistive technologies.
drag(newLoc, e)		Moves the block and updates any connection previews.
endDrag(_e, disposition)		Cleans up any state at the end of the drag. Applies any pending connections.
findTraversalCandidate(delta)		Get the nearest valid candidate connection in traversal order.
getSearchRadius()	protected	Get the radius to use when searching for a nearby valid connection.
getTargetBlock()	protected	Returns the block to use for the current drag operation. This may create and return a newly instantiated block when e.g. dragging from a flyout.
isMovable()		Returns true if the block is currently movable. False otherwise.
positionNewBlock(oldBlock, newBlock)	protected	Positions a cloned block on its new workspace.
revertDrag()		Moves the block back to where it was at the beginning of the drag, including reconnecting connections.
shouldDisconnect(healStack)	protected	Whether or not we should disconnect the block when a drag is started.
shouldHealStack(e)	protected	Get whether the drag should act on a single block or a block stack.
startDrag(e)		Handles any setup for starting the drag, including disconnecting the block from any parent blocks.