Eng:Backdrop Number (block)

The Backdrop # block is a Looks Block and a Reporter Block. This block holds the current backdrop number. In Scratch 1.x, this block appeared for both the stage and sprites. However, in Scratch 2.0 it only is in the stage's block palette. The workaround for allowing sprites to obtain the block is to simply drag it from the stage's scripts over to the sprite, using either the backpack or another transferring method. The version for sprites is Costume #. "Costume #", reversely, cannot be used in the stage; if tried, a Script Error will be thrown.

This block can be displayed as a stage monitor.

History
Prior to Scratch 2.0, this block was called Background #. Unlike the other backdrop blocks, this only changed its name, not its function.

Example Uses
As this block holds the backdrop number of the Stage, it is used when something must happen if the Stage is at a specific backdrop. Some more common uses: when gf clicked wait until <(backdrop #) = (6)> stop [all v] say (join [The current backdrop is: ](backdrop #)) set [level v] to (backdrop #)
 * Stopping the project once the Stage reaches the backdrop for the end of the project
 * Checking what the current backdrop is
 * Setting a variable to the backdrop scene

Workaround
This block can simply be replicated with the following code

([backdrop # v] of [Stage v])

This workaround is useful whenever a sprite needs to detect the current backdrop number.