layer.draggable.directionLock < boolean>

Snap to horizontal/vertical direction after a certain threshold.
译：在一定阈值后，向水平/垂直方向对齐。

layerA = new Layer
layerA.draggable.enabled = true

# Allow dragging only in one direction at a time 
layerA.draggable.directionLock = true

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