Call this within a transaction block to roll back the transaction and prevent any of its data from being rendered. You must reset the y-position yourself if you have performed any drawing operations that modify it.
# File lib/prawn/document/snapshot.rb, line 21 def rollback raise RollbackTransaction end
Run a block of drawing operations, to be completed atomically. If rollback is called or a RollbackTransaction exception is raised inside the block, all actions taken inside the block will be rolled back (with the exception of y-position, which you must restore yourself).
Returns true on success, or false if the transaction was rolled back.
# File lib/prawn/document/snapshot.rb, line 33 def transaction snap = take_snapshot yield true rescue RollbackTransaction restore_snapshot(snap) false end
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