Solved

Trackbar Snap

Posted on 2004-10-19
8
1,249 Views
Last Modified: 2011-09-20
Can someone tell me how to make a trackbar snap into the position the mouse click took place.  I would like the trackbar to snap to the position I click on the trackbar with my mouse.  This is on a trackbar without tick marks.

Thanks,
Kendal
0
Comment
Question by:gvector1
[X]
Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people just like you are talking about what matters.

  • Help others & share knowledge
  • Earn cash & points
  • Learn & ask questions
  • 4
  • 4
8 Comments
 
LVL 8

Accepted Solution

by:
AaronReams earned 500 total points
ID: 12353100
This is basically one way of going about it.  It might need a little tweak near the ends of the trackbar, but you get the idea...  try increasing the maximum ticks for better resolution.

private void trackBar1_MouseDown(object sender, System.Windows.Forms.MouseEventArgs e)
{
     int numberTicks = (trackBar1.Maximum - trackBar1.Minimum)/(trackBar1.TickFrequency);
     float percent = ((float)e.X )/(float)trackBar1.Size.Width;
     int newValue = (int) ((float) numberTicks * (float)percent);
     trackBar1.Value = newValue;            
}

cheers,
Aaron
0
 
LVL 8

Expert Comment

by:AaronReams
ID: 12353132
i should also mention that the tweak at the ends i mentioned is due to the fact that the actual trackbar doesn't stretch from end-to-end of the trackbar size.  you'll notice that the trackbar has about 10 pixels of padding on each end.  it shouldn't be too hard to compensate by adding that to the above equation.

let me know if you have any questions.

good luck,
aaron
0
 

Author Comment

by:gvector1
ID: 12362129
I have looked at the trackbar and considered the tweak that you mentioned.  It looks as though the further you move from the center the more off the values are.  It is not just the ends.  The only way I can think of correcting this problem is doing some heavy calculations based on one half of the trackbar, the 10 pixels on the end, and the position of the pointer.  I am thinking along the lines of having to take half of the trackbar width, divide it by 10, and based on which section of 10 the pointer is located, adding the correct number(1-10) to the variable holding the pointers x position.  Does that sound right or am I making it harder than it is??????

Thanks,
Kendal
0
Creating Instructional Tutorials  

For Any Use & On Any Platform

Contextual Guidance at the moment of need helps your employees/users adopt software o& achieve even the most complex tasks instantly. Boost knowledge retention, software adoption & employee engagement with easy solution.

 
LVL 8

Expert Comment

by:AaronReams
ID: 12362484
That would probably work but I think that is making it a bit more complicated than necessary.    I don't  know the exact amount of pixels at each end because I think it is proportional to the length of the toolbar.  However, you can modify the percentage calculation as such to get a closer approximation:

float percent = ((float)e.X - 10)/(float)(trackBar1.Size.Width-20);

this way you're decreasing the total width by 2x and offsetting the mouse cursor by 1x.  that should do the trick.

cheers,
aaron
0
 

Author Comment

by:gvector1
ID: 12362976
Excellent.  I hate that you had to give me the calculations, but I never would have thought of that formula.

Thanks again,
Kendal
0
 
LVL 8

Expert Comment

by:AaronReams
ID: 12363125
No worries mate.   It wasn't exactly obvious how to accomplish this.   You'd think there would be a function you could call to move the trackbar slider to the current mouse position.  

-Aaron

0
 

Author Comment

by:gvector1
ID: 12363156
Exactly.  Thanks again for the assistance.

Kendal
0
 

Author Comment

by:gvector1
ID: 12444562
I'm sorry. I forgot to accept your answer as the solution.  Anyway, thanks again.
0

Featured Post

Industry Leaders: We Want Your Opinion!

We value your feedback.

Take our survey and automatically be enter to win anyone of the following:
Yeti Cooler, Amazon eGift Card, and Movie eGift Card!

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Introduction This article series is supposed to shed some light on the use of IDisposable and objects that inherit from it. In essence, a more apt title for this article would be: using (IDisposable) {}. I’m just not sure how many people would ge…
It was really hard time for me to get the understanding of Delegates in C#. I went through many websites and articles but I found them very clumsy. After going through those sites, I noted down the points in a easy way so here I am sharing that unde…
In this video, viewers will be given step by step instructions on adjusting mouse, pointer and cursor visibility in Microsoft Windows 10. The video seeks to educate those who are struggling with the new Windows 10 Graphical User Interface. Change Cu…
In this video, viewers are given an introduction to using the Windows 10 Snipping Tool, how to quickly locate it when it's needed and also how make it always available with a single click of a mouse button, by pinning it to the Desktop Task Bar. Int…

707 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question