How do i check or update a variable in trackBar Scroll when i move the Bar scroll it to the left ?

Question

Now in the scroll event i can update the List when i move the Bar to the right i start the program when the Bar is on frame 0 and i slide it to the right.

And each frame each tick of the TrackBar i slide to the right i update the List.

But when i move the trackBar slide it back to the left and the trackBar1.Value is counting down back i want to load from the List to each frame .

But how do i know if i move the trackBar slider to the left or to the right ?

private void trackBar1_Scroll(object sender, EventArgs e)
        {
            LoadPictureAt(trackBar1.Value, sender);
            currentFrameIndex = trackBar1.Value;
            textBox1.Text = "Frame Number : " + trackBar1.Value;
            WireObjectCoordinatesCloneFrame();
            wireObjectCoordinates1 = new WireObjectCoordinates();
            WireObjectCoordinatesList.Add(wireObjectCoordinates1);
            
            
        }

---

danieli

Answer 1

What I would do is to either save the FrameNumber in the wireObjectsCoordiunates1 - object and search the list for the WireObjectCoordinates that has that number, or initially add as much empty WireObjectCoordinates-objects to the list and update the ones that are at the same index of the list as the trackBar's value.

Regards,

  Thorsten

Answer 2

... for instance add a Property FrameNUmber to your class WireObjectCoordinates:

    class WireObjectCoordinates
    {
        public int FrameNumber { get; set; }

        //...
    }

then search the list like:

        private void trackBar1_Scroll(object sender, EventArgs e)
        {
            LoadPictureAt(trackBar1.Value, sender);
            currentFrameIndex = trackBar1.Value;
            textBox1.Text = "Frame Number : " + trackBar1.Value;

            int idx = -1;

            try
            {
                var w = WireObjectCoordinatesList.First(a => a.FrameNumber == currentFrameIndex);
                idx = WireObjectCoordinatesList.IndexOf(w);
            }
            catch
            {

            }

            if (idx > -1)
            {
                 //do the things you want to do when the list contains the object
            }
            else
            {
                WireObjectCoordinatesCloneFrame();
                wireObjectCoordinates1 = new WireObjectCoordinates() { FrameNumber = currentFrameIndex };
                WireObjectCoordinatesList.Add(wireObjectCoordinates1);
            }       
        }

Regards,

  Thorsten