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761: Mainline 
 

All that remains is to fill in the templates to provide the behavior 
you want.  For example, in the decrementMeter: method—the callback 
method for the clicked event—you arrange to set the value, in the 
meter named 'the meter', to 1 less than the current value.  Then, 
you activate the display event to redraw the meter with the new 
value.

GuiViewManager method definition • instance 
decrementMeter: theButton 
  | meter | 
  meter := self paneNamed: 'the meter'. 
  meter setValue: meter getValue - 1; 
        event: #display 




You define the incrementMeter callback method analogously:

GuiViewManager method definition • instance 
incrementMeter: theButton 
  | meter | 
  meter := self paneNamed: 'the meter'. 
  meter setValue: meter getValue + 1; 
           event: #display