Infralution Support

[erikest]

I'm trying to implement the standard Ctrl+c, Ctrl+v (copy/paste) functionality on my tree rows. I'm handling the key_down event (and the key_press I've tried as well), but it only ever picks up the first key. So Ctrl+c in the key_down handler only sees Ctrl, and the c never comes through, not even as a separate event. Any ideas?

Thanks,
_________________
Erik Taylor
Developer
EnergySoft, LLC.

[erikest]

Am I retarded? I'm trying something even simpler... I just want to expand the row when the user presses the right arrow key. The funny thing is, the event handler's (key_press or key_down) never get called when I press the right arrow (left arrow). Is the tree suppressing key strokes? Can I turn that 'feature' off? It also suppresses the down (up) arrow unless I'm at the last (first) visible row.

Thanks,
_________________
Erik Taylor
Developer
EnergySoft, LLC.

[Infralution]

[erikest]

Hmm.. What could cause this default behavior to fail. It really seems like something is catching my key presses and suppressing them. I've tried everything on the simple example I sent in for the IDataErrorInfo problem and Ctrl+<whatever> works and so does the default behavior for the arrow keys. In my more complex tree, only up and down arrows work. Could anything with objectrowbindings be causing key press suppression? Could ProcessCmdKey be erroring out and killing the event handlers?

Could the default behavior have been modified or changed through a property or something?

This is really baffling.

I appreciate the code for the Ctrl+v, it looks just like the code I have in there already. The problem is that it never registers the v. Something captures the ctrl, supresses the v and passes the ctrl to the keyDown. The v disappears into the ether.

Like I was saying before, nothing happens at all when I press the right or left arrow keys, it doesn't even fire an event handler. So even if the default behavior was working, I wouldn't be able to do anything else with these key presses - they don't register. This is the case in the IDataErrorInfo sample I sent you guys earlier too. If you handle the key down event, you'll see that pressing the right arrow key doesn't trigger a key down event. In fact, the behavior seems inconsistent here, now that I look at it. Here's what I'm seeing in the sample, tell me if the same happens on your end:

1) Debug the project
2) select "Parental Unit" aka the first row
3) press right arrow key
4) notice that the values of the bound text boxes change, indicating that selected item has changed
5) notice that the tree did not expand and the currently selected row is not visible
6) press right again and the tree expands and the correct row is selected
7) press left and the selected row becomes the first row
press left again and the rows collapse
9) press right and the row expands but the selection does not move
10) press right a final time and the selection moves.
11) if you have a break point inside a keydown handler, you'll notice that pressing right didn't fire the event anywhere

Any help on what's going on would be great.
_________________
Erik Taylor
Developer
EnergySoft, LLC.

[Infralution]

[sbass]

I ran into this in other contexts earlier. If you define the shortcut keys for Cut/Copy/Paste in the menu, these are not available to the control. So standard TextBox or other controls which know how to handle Ctrl-C, never get the chance.

After seraching around on the web, what works for standard controls is to send a Windows message to the control. The code looks sort of like this

private void cutToolStripMenuItem_Click(object sender, EventArgs e)
{
SendMessage(GetLowestActiveControl(ActiveControl).Handle, WM_CUT, IntPtr.Zero, IntPtr.Zero);
}

where the GetLowestActiveControl walks down through containers to find the active control. The standard controls have Cut/Copy/Paste methods that can handle the Windows message.

I need the same behavior in the VT. But it does not have base class methods that respond to these messages that I can override to implement the behavior I need.

Is there any way to get at this behavior?

[Infralution]

If you want Virtual Tree to handle the WM_CUT window message then you would need to override the WndProc method eg