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In the following definition, if the left button is pressed at the time the
redButtonPressed message is sent, controlActivity enters a
loop, which continues as long as the left button is pressed. When the
button is released, controlActivity sends the newModelValue
message, which determines where the mouse is, relative to the minimum and
maximum values displayed on the meter, and computes the model's value
accordingly:
MeterController method definition • instance controlActivity self sensor redButtonPressed ifTrue: [[self sensor redButtonPressed] whileTrue: []. self model value: self newModelValue].