private void PlayButton_Click(object sender, EventArgs e)
{
// The stopwatch logic can be in one of three possible
// states, off, stopwatch only, and on. The play button's
// only functionality is to set the stopwatch logic to on.
// The play button will only function in the off and
// stopwatch only mode, with it's purpose to set the on
// mode. If this event can be raised, the mode is either
// off or stopwatch only. If the stopwatch object is not
// running, it's in the off mode, thus the stopwatch
// object must be started. The timer object must be
// started. With both running, the stopwatch logic is in
// on mode, in which the play button must not be enabled,
// and the stop button (available in stopwatch and on mode,
// prohibited in off mode) must be enabled. The pause
// button is always enabled, and does not need to be
// changed.
// Switching to on mode, play has no defined behavior
PlayButton.Enabled = false;
// Switching of on mode, stop has a defined behavior
StopButton.Enabled = true;
// Even if in on mode, starting a stopwatch that's already
// started does not affect the stopwatch or it's current
// elapsed time.
stopwatch.Start();
StopwatchUpdateTimer.Start();
timerUpdatesUI = true;
}
private void StopButton_Click(object sender, EventArgs e)
{
// The stopwatch logic can be in one of three states,
// off (both stopwatch and timer off), stopwatch only
// (stopwatch on, timer off), and on (both stopwatch
// and timer on). The purpose of the stop button is to move
// on mode or stopwatch only mode to the off mode. In the
// off mode, stop is undefined and must be disabled,
// while play is defined and must be enabled. Pause is
// always defined, always enabled, and need not be changed.
StopButton.Enabled = false;
PlayButton.Enabled = true;
stopwatch.Stop();
StopwatchUpdateTimer.Stop();
timerUpdatesUI = false;
}
