WinForms - action after resize event

Question

Is it possible to perform a specific action after the resize event (of the user control), for example when mouse button is released? I need to manually resize an inner control and doing it on every single firing of the event would be quite, hmm, inefficient...

Answer 1

Another option if you are using a control and not a form and would like to perform actions after the resize has been completed (user stopped resizing control):

private int resizeTimeout = 0;
private Task resizeTask;

public void OnResize()
{
  resizeTimeout = 300; //Reset timeout
  //Only resize on completion. This after resizeTimeout if no interaction.
  if (resizeTask == null || resizeTask.IsCompleted)
  {
    resizeTask = Task.Run(async () =>
    {
      //Sleep until timeout has been reached
      while (resizeTimeout > 0)
      {
        await Task.Delay(100);
        resizeTimeout -= 100;
      }
      ResizeControl();
    });
  }
}

private void ResizeControl()
{
  if (this.InvokeRequired)
  {
    //Call the same method in the context of the main UI thread.
    this.Invoke((MethodInvoker)delegate { ResizeControl(); });
  }
  else
  {
    // Do resize actions here
  }
}