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module tut6_7_2
// ********************************************************************************
// Clean tutorial example program.
//
// This program monitors keyboard input that is sent to a Window.
// ********************************************************************************
import StdEnv, StdIO
Start :: *World -> *World
Start world
# (wid, world) = openId world
# window = Window "Mousespotting" NilLS [
WindowMouse (const True) Able (noLS1 (spotting wid)),
WindowId wid,
WindowClose (noLS closeProcess)]
= startIO SDI Void (snd o openWindow Void window) [ProcessClose closeProcess] world
where
spotting :: Id x (PSt .l) -> PSt .l | toString x
spotting wid x pst = appPIO (setWindowLook wid True (False, look (toString x))) pst
look :: String SelectState UpdateState *Picture -> *Picture
look text _ {newFrame} picture
# picture = unfill newFrame picture
# (width, picture) = getPenFontStringWidth text picture
= drawAt {x=(w-width)/2,y=h/2} text picture
where
{w,h} = rectangleSize newFrame
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