/// <summary>
/// Does the asynchronous highlighting step.
/// </summary>
private void StepHilite()
{
if (_stateHilite == null)
{
return; // Has been shut down
}
uint dwStart = Win32Declarations.GetTickCount();
uint dwLimit = 222; // Allow running for this much milliseconds continuously
// Freeze the control
Win32Declarations.SendMessage(Handle, Win32Declarations.WM_SETREDRAW, IntPtr.Zero, IntPtr.Zero);
try
{
int nIterations;
for (nIterations = 0; Win32Declarations.GetTickCount() - dwStart < dwLimit; nIterations++) // Work for some limited time
{
if (!_stateHilite.StepHiliteDelegate(_stateHilite)) // Invoke the individual highlighting step
{ // Highlighting Completed!
// Reset the status bar dials
_statuswriter.ClearStatus();
_statuswriter = null;
// Retrieve the values
_wordsSearchHits = _stateHilite.ActualSearchHits;
_nCurrentSearchHit = -1;
// Deinitialize the hilite search
_stateHilite = null;
// Jump to the next search hit
GotoNextSearchHit(true, false);
// Invalidate
Win32Declarations.SendMessage(Handle, Win32Declarations.WM_SETREDRAW, (IntPtr)1, IntPtr.Zero);
Invalidate();
// Done!
Trace.WriteLine(String.Format("The JetRichTextBox has completed the async highlighting with {0} hits total.", (_wordsSearchHits != null ? _wordsSearchHits.Length.ToString() : "#ERROR#")), "[JRTB]");
return;
}
}
Trace.WriteLine(String.Format("The JetRichTextBox async highlighting has done {0} highlightings on this step.", nIterations), "[JRTB]");
}
finally
{
// Unfreeze the events and repaint
Win32Declarations.SendMessage(Handle, Win32Declarations.WM_SETREDRAW, (IntPtr)1, IntPtr.Zero);
if ((_stateHilite != null) && (Win32Declarations.GetTickCount() - _stateHilite.LastRepaintTime > 2000)) // Repaint rarely
{
Invalidate();
_stateHilite.LastRepaintTime = Win32Declarations.GetTickCount();
}
}
// Requeue the rest of execution
Application.DoEvents(); // Without this, the painting events won't occur
Core.UserInterfaceAP.QueueJob("Highlight the search hits.", new MethodInvoker(StepHilite));
}
