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Implement undo, cut, paste, copy functionality

Posted on 2003-11-25
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Last Modified: 2011-10-03
How can I implement cut paste copy and undo functionality in my text boxes?  the shortcuts work, crtl-c and what not.  Are they methods I can easily call (how would I know which control had the focus before the menu item was selected)?
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Question by:jjacksn
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TheAvenger earned 1000 total points
ID: 9823309
You have the methods TextBox.Copy, TextBox.Cut, TextBox.Paste and TextBox.Undo. Using them you can make all the things you asked for.

To find out which control has the focus, you can do this:

private Control FindFocused (Control parent) {
  foreach (Control ctrl in parent.Controls)
    if (ctrl.ContainsFocus)  // The focus is on this control or one of it's children
      if (ctrl.Focused)  // This control is focused
        return ctrl;
      else  // A child of this control is focused
        return FindFocused (ctrl);
  return null;  // No focus at all in this control
}

and then in your form call:

Control ctrl = FindFocus (this);
if (ctrl is TextBox) {
  TextBox tBox = (TextBox)ctrl;
  tBox.Copy();
  ....
}
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by:jjacksn
ID: 9826864
Does a control retain the focus even when the menu item is clicked?
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Expert Comment

by:TheAvenger
ID: 9826876
An interesting question... Try executing the code I gave you in the menu handler. If it returns null, then not, otherwise yes
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