Examples of edu.mit.blocks.codeblockutil.Navigator

• edu.mit.blocks.codeblockutil.Navigator
  A navigator navigates between different Explorers. Though the UI holds a common theme, each explorer may represent a unique subset of the whole. Basically, say we have a bunch of canvases (100). Say that we group the canvases into 5 explorers based on some quality and have each individual explorer independently control and display its own group of canvases. The problem we run into is how do we switch from one explorer to the next. There are many ways to do this. We can have buttons that makes unused explorers hidden. Or we have shrink them. This particular implementation chooses to slide them to the side. Now that you know why we need a navigator, let's talk about what a Navigator is. A Navigator lines up a set of explorers along the x-axis. It slides between the explorers until it reaches the end. That's it. Simple? Note however, that each explorer must be UNIQUE. NO EXCEPTIONS! That is, the name of a particular explorer may not be shared by any other explorers. This check rep. is made when adding new explorer. A Navigator unfortunately makes a once dangerous assumption: the name of each explorer must remain the same forever. If the name changes, then the invariant described in the previous paragraph no longer holds. @author An Ho

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