CODEWITHSUNDEEP
c#winforms
Sirop4ik
Sirop4ik

Reputation: 5243

Click out of the item in CheckedListBox has impact on last clicked item

I have a CheckedListBox with 3 items. I click on first one and checked it, then I click out of the item, but I see that click has an impact on item.

There is a video

https://youtu.be/DnCNGZjxkvM

How to solve this? I would like to get click only if I click on item and not if I don't.

EDIT (special for @Kieran Devlin )

 for (int i = 0; i < 3; ++i)
            {
                string str = "Item " + i;
                checkedListBox1.Items.Add(str);
            }

P.S There is nothing to add, it is very obvious question, I don't understand how I can produce min reprodusable example. It is very simple I have a checklistbox with 3 items (above) then you click on item checkbox and his state changed, then you click out of the item and his state changing again (it is a problem) user don't expect that he click out of the item and it somehow has impact on item. I don't understand what to reproduce here, sorry...

Upvotes: 0

Views: 52

Answers (1)

LarsTech
LarsTech

Reputation: 81610

I think you have to intercept the mouse down:

public class CheckedListBoxEx : CheckedListBox
{
  private const int WM_LBUTTONDOWN = 0x201;

  protected override void WndProc(ref Message m)
  {
    if (m.Msg == WM_LBUTTONDOWN)
    {
      Point pt = new Point(m.LParam.ToInt32());
      if (this.IndexFromPoint(pt) == -1)
      {
        return;
      }
    }
    base.WndProc(ref m);
  }
}

Upvotes: 1

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