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from __future__ import with_statement   # <-- Python 2.5 ONLY
import Tix
import time

class SplashScreen( object ):
   def __init__( self, tkRoot, imageFilename, minSplashTime=0 ):
      self._root              = tkRoot
      self._image             = Tix.PhotoImage( file=image )
      self._splash            = None
      self._minSplashTime     = time.time() + minSplashTime
      
   def __enter__( self ):
      # Remove the app window from the display
      self._root.withdraw( )
      
      # Calculate the geometry to center the splash image
      scrnWt = self._root.winfo_screenwidth( )
      scrnHt = self._root.winfo_screenheight( )
      
      imgWt = self._image.width()
      imgHt = self._image.height()
      
      imgXPos = (scrnWt / 2) - (imgWt / 2)
      imgYPos = (scrnHt / 2) - (imgHt / 2)

      # Create the splash screen      
      self._splash = Tix.Toplevel()
      self._splash.overrideredirect(1)
      self._splash.geometry( '+%d+%d' % (imgXPos, imgYPos) )
      Tix.Label( self._splash, image=self._image, cursor='watch' ).pack( )

      # Force Tk to draw the splash screen outside of mainloop()
      self._splash.update( )
   
   def __exit__( self, exc_type, exc_value, traceback ):
      # Make sure the minimum splash time has elapsed
      timeNow = time.time()
      if timeNow < self._minSplashTime:
         time.sleep( self._minSplashTime - timeNow )
      
      # Destroy the splash window
      self._splash.destroy( )
      
      # Display the application window
      self._root.deiconify( )


#--------------------------------------------
# Now putting up splash screens is simple



# Create the tkRoot window
tkRoot = Tix.Tk( )

with SplashScreen( tkRoot, 'splashImage.jpg', 3.0 ):
   initializeMyApplication( )
   buildTheGUI( tkRoot )

tkRoot.mainloop( )

History

  • revision 2 (14 years ago)
  • previous revisions are not available