C#

class SomeClass<br />
{<br />
  public Routine1()<br />
  {<br />
    // Show "Wait" cursor (hour-glass)<br />
    System.Windows.Forms.Cursor.Current = System.Windows.Forms.Cursors.WaitCursor;<br />
<br />
    // reset completion flag<br />
    workDone = false;<br />
<br />
    ThreadStart ts = new ThreadStart(DoWorkWithStatusChecking);<br />
    Thread t = new Thread(ts);<br />
    t.Start();<br />
<br />
    // in this loop we wait for completion and<br />
    // processing GUI messages.<br />
    while( ! t.IsDone this.workDone )<br />
    {<br />
      // If you need to prevent user's interaction with GUI<br />
      // (clicking around, pressing buttons, etc.)<br />
      // you can pass message filter to Application.DoEvents()<br />
      System.Windows.Forms.Application.DoEvents();<br />
      // following line is here to prevent 100% CPU load<br />
      // but some people think it's not necessary<br />
      // i just dont have time to check it, 'cause it works just fine<br />
      Sleep(0);<br />
    }<br />
  }<br />
<br />
  bool workDone = false;<br />
<br />
  void DoWorkWithStatusChecking()<br />
  {<br />
    // This is what you want to do after status-checking.<br />
    if( this.Status )<br />
    {<br />
    }<br />
    else<br />
    {<br />
    }<br />
<br />
    // ... done, set <br />
    this.workDone = true;<br />
  }<br />
<br />
  bool CheckStatus()<br />
  {<br />
    // ... real status checking here<br />
<br />
    return ( true | false );<br />
  }<br />
} // end class SomeClass

bool Release;
public void MyMethod()
{
     Release = false;
     UseWaitCursor = true;
     MyControl.Capture = true;
     //Do a lengthy operation...
     UseWaitCursor = false;
     Release = true;
     MyControl.Capture = false;
}

private void MyControl_MouseCaptureChanged(object sender, EventArgs e)
        {
            if(!Release)
               MyControl.Capture = true;
        }

class MyClass : Form
        {
            Control Dummy;
            bool busy;
            MyClass()
            {
                Dummy = new Control();
                busy = false;
                Dummy.MouseCaptureChanged += new EventHandler(Dummy_MouseCaptureChanged);
            }

            public void MyLongMethod()
            {
                busy = true;
                Dummy.Capture = true;
                UseWaitCursor = true;

                // TODO: Add your code here

                busy = false;
                Dummy.Capture = false;
                UseWaitCursor = false;
            }

            void Dummy_MouseCaptureChanged(object sender, EventArgs e)
            {
                if (busy)
                    Dummy.Capture = true;
            }
        }

lushgrass wrote:

turns out this event is only in 2.0

Dummy.LostFocus += new EventHandler(Dummy_LostFocus);

private void Dummy_LostFocus(object sender, System.EventArgs e)
{
    if(Busy)
        Dummy.Capture = true;
}

<br />
public class Form1<br />
{<br />
     private StatusBar status;<br />
     private bool busy;<br />
     private Control control;<br />
<br />
     public Form1()<br />
     {<br />
          status.Capture = true;<br />
          busy = false;<br />
          control = new Control();<br />
          control.Capture = false;<br />
          control.LostFocus += new EventHandler(control_LostFocus);<br />
     }<br />
<br />
     private void control_LostFocus()<br />
     {<br />
          if(busy)<br />
               control.Capture = true;<br />
     }<br />
<br />
     private void Search()<br />
     {<br />
          status.Text = "Searching";<br />
          busy = true;<br />
          control.Capture = true;<br />
<br />
          // search code here<br />
<br />
          control.Capture = false;<br />
          busy = false;<br />
          status.Text = "";<br />
     }<br />
}<br />

public class Form1
{
    private StatusBar status;
    private bool busy;
    private Control control;
    
    public Form1()
    {
        //status.Capture = true;    1)Don't put this or you'll lose capture to the status bar. Whyis that?
        busy = false;
        control = new Control();
        control.Capture = false;
        control.LostFocus += new EventHandler(control_LostFocus);
    }

    private void control_LostFocus()
    {
        if(busy)
            control.Capture = true;
    }

    private void Search()
    {
        status.Text = "Searching";
        busy = true;
        control.Capture = true;
    
        // search code here
    
        busy = false;    //2)This must be before changing the capture to false
        control.Capture = false;
        status.Text = "";
    }
}

if(busy)
    return;