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# Description: This is the implementation file for the Controller class, which implements the #changeTransparency
# action, called when the slider on the window is moved.
class Controller < NSObject
# Kinda the same as IBOutlet NSWindow *itsWindow; on Objective-C
attr_writer :itsWindow
# This method changes the transparency for the *entire window*, not some particular object. Thus,
# all objects drawn in this window, even if drawn at full alpha value, will pick up this setting.
def changeTransparency(sender)
# set the window's alpha value from 0.0-1.0
# go ahead and tell the window to redraw things, which has the effect of calling CustomView's -drawRect: routine