Checking the time difference between boolean values

Question

I've got a Boolean value called isPressed which is active when all keyboard and mouse buttons are active. What I want to achieve is when the isPressed Boolean value is true to start a timer (preferably using the Stopwatch class). While isPressed is true keep the timer going and as soon as isPressed is false then stop the timer and get the difference. After it's stopped and it's true again and then stops again, add the difference to the previous timer.

I tried to use the code from this post but I couldn't get it to work. I tried doing something like:

Stopwatch stopWatch = new Stopwatch();
TimeSpan ts = stopWatch.Elapsed;
if (isPressed)
{
    stopWatch.Start();
}
else
{
    stopWatch.Stop();
    string elapsedTime = String.Format("{0:00}:{1:00}:{2:00}.{3:00}", ts.Hours, ts.Minutes, ts.Seconds, ts.Milliseconds / 10);
    lblTime.Text = string.Format("{0}", elapsedTime);
}

The lblTime label always stayed at 0.

Specifically, show where isPressed is assigned. That is where you will want to start/stop your timer. — Eric J., Sep 29 '15 at 23:53
Perhaps you should make `stopWatch` global and construct it only once (when `isPressed` is true). — Andrey Nasonov, Sep 29 '15 at 23:54
@EricJ. isPressed is assigned in KeyDown and MouseDown events. — Zer0, Sep 30 '15 at 00:17
Then that is where you should start/stop your timer. The solution proposed by @RobCroll seems reasonable. — Eric J., Sep 30 '15 at 00:19

score 1 · Answer 1 · answered Sep 30 '15 at 00:08

I'm thinking a stopwatch is maybe an unnecessary overhead. You could mark the time isPressed is set to true and the time isPressed is set to false and then do the calculation.

    private long _pressedTicks;
    private long _durationTicks;

    private bool _pressed;

    public bool Pressed
    {
        get { return _pressed; }
        set
        {
            if (value == _pressed)
            {
                //Do nothing;
            }
            else if (value == false)
            {
                _durationTicks = DateTime.Now.Ticks - _pressedTicks;
                _pressed = value;
            }
            else
            {
                _pressed = value;
                _pressedTicks = DateTime.Now.Ticks;
            }
        }
    }

Note: Call `Pressed = true` or `Pressed = false` as appropriate from your KeyDown and MouseDown event handlers. — Eric J., Sep 30 '15 at 00:20

score 0 · Accepted Answer · answered Sep 30 '15 at 00:20

0

I actually managed to get it to work thanks to @Andrey Nasonov, All I have to do was actually set Stopwatch stopWatch = new Stopwatch(); global.

answered Sep 30 '15 at 00:20

Zer0

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Checking the time difference between boolean values

2 Answers2