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Old Mar 9, 2012, 04:02 AM   #1
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Join Date: Feb 2012
window question

I am trying to get my head around the difference between sheets and panels and other types of windows.

Could someone please tell me what is being used by the Mac Mail application (on Lion if that makes a difference) when one chooses Add Account from the file menu?
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Old Mar 9, 2012, 11:06 AM   #2
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A sheet is a modal dialog that you attach to a window with a method call that causes it to be displayed. The idea was to make a modal dialog that did not block the user from doing things elsewhere (clicking into other windows) while it is displayed, also clarifying the dialog's target window.

Typically, you would build a sheet's layout in interface builder as a window object, then use that object as an argument to the method call that displays the sheet. File open/save sheets are a little more complicated to code yourself because they are asynchronous, but most of the time you just let NSDocument handle that for you.

Sheet Programming Guide
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