public void UpdateDialog()
{
// Remember the first time the update is called
if (!_startTimestamped)
{
_startTimestamped = true;
_startTimestamp = DateTime.Now;
}
else
{
// If the dialog has not been shown yet
if (!Visible)
{
// Has initial delay expired?
if (DateTime.Now.Subtract(_startTimestamp).TotalMilliseconds > DELAY_SHOWING)
{
// Make this dialog visible to the user
Show();
// Start the spin timing
_spinTimestamp = DateTime.Now;
}
}
else
{
// Has the spin delay expired?
if (DateTime.Now.Subtract(_spinTimestamp).TotalMilliseconds > DELAY_SPIN)
{
// Increase the spin angle by one notch
_spinAngle = (_spinAngle + SPIN_ANGLE) % 360;
// Request the spin image be redrawn
Invalidate();
// Start the next spin timing
_spinTimestamp = DateTime.Now;
}
}
}
// Let any repainting or processing events be dispatched
Application.DoEvents();
}
/// <summary>
/// Perform operation in a worker thread with wait dialog in main thread.
/// </summary>
/// <param name="op">Delegate of operation to be performed.</param>
/// <param name="parameter">Parameter to be passed into the operation.</param>
/// <returns>Result of performing the operation.</returns>
public static object PerformOperation(Operation op, object parameter)
{
// Create a modal window for showing feedback
using (ModalWaitDialog wait = new ModalWaitDialog())
{
// Create the object that runs the operation in a separate thread
OperationThread opThread = new OperationThread(op, parameter);
// Create the actual thread and provide thread entry point
Thread thread = new Thread(new ThreadStart(opThread.Run));
// Kick off the thread action
thread.Start();
// Keep looping until the thread is finished
while (opThread.State == 0)
{
// Sleep to allow thread to perform more work
Thread.Sleep(25);
// Give the feedback dialog a chance to update
wait.UpdateDialog();
}
// Process operation result
switch (opThread.State)
{
case 1:
return opThread.Result;
case 2:
throw opThread.Exception;
default:
// Should never happen!
Debug.Assert(false);
return null;
}
}
}