/// <summary>
/// Push an execution frame.
/// </summary>
/// <param name="frame">
/// The frame for the dispatcher to process.
/// </param>
public static void PushFrame(DispatcherFrame frame)
{
if (frame == null)
{
throw new ArgumentNullException("frame");
}
Dispatcher dispatcher = Dispatcher.CurrentDispatcher;
if (dispatcher._hasShutdownFinished)
{
throw new InvalidOperationException();
}
dispatcher.PushFrameImpl(frame);
}
private void OnButtonUp(object sender, ButtonEventArgs e)
{
// Show a modal dialog window
// Create and show new window
SecondWindow wnd = new SecondWindow();
wnd.Visibility = Visibility.Visible;
wnd.Topmost = true; // move on top of all others
DispatcherFrame modalFrame = new DispatcherFrame();
// Create a handler that will terminate the loop when the window will be hidden
PropertyChangedEventHandler handler = delegate
{
if (wnd.Visibility != Visibility.Visible) // when the windows was hidden
modalFrame.Continue = false; // tell the frame to exit the loop
};
wnd.IsVisibleChanged += handler; // add handler to terminate the loop
Dispatcher.PushFrame(modalFrame); // start the loop and block the calling thread
// Here we go when the modal dialog was closed
wnd.IsVisibleChanged -= handler; // remove handler
}
//
// instance implementation of PushFrame
private void PushFrameImpl(DispatcherFrame frame)
{
_frameDepth++;
try
{
while (frame.Continue)
{
DispatcherOperation op = null;
bool aborted = false;
//
// Dequeue the next operation if appropriate
if (_queue.Count > 0)
{
op = (DispatcherOperation)_queue.Dequeue();
//Must check aborted flag inside lock because
//user program could call op.Abort() between
//here and before the call to Invoke()
aborted = op.Status == DispatcherOperationStatus.Aborted;
}
if (op != null)
{
if (!aborted)
{
// Invoke the operation:
Debug.Assert(op._status == DispatcherOperationStatus.Pending);
// Mark this operation as executing.
op._status = DispatcherOperationStatus.Executing;
op._result = null;
try
{
op._result = op._method(op._args);
}
catch (Exception e)
{
if (_finalExceptionHandler == null ||
!_finalExceptionHandler(op, e))
{
throw;
}
}
// Mark this operation as completed.
op._status = DispatcherOperationStatus.Completed;
// Raise the Completed so anyone who is waiting will wake up.
op.OnCompleted();
}
}
else
{
_event.WaitOne();
}
}
}
finally
{
_frameDepth--;
// If this was the last frame to exit after a quit, we
// can now dispose the dispatcher.
if (_frameDepth == 0)
{
if (_hasShutdownStarted)
{
ShutdownImpl();
}
}
}
}
public MessageBox(Font font, int width, string message, MessageBoxButton buttonsSet, Bitmap buttonBackground, Color buttonTextColor, Color textColor)
{
Background = new SolidColorBrush(Colors.Black);
Width = width;
Visibility = Visibility.Hidden;
SizeToContent = SizeToContent.Height;
this.buttonsSet = buttonsSet;
main = Application.Current.MainWindow;
modalBlock = new DispatcherFrame();
StackPanel pnl = new StackPanel(Orientation.Vertical);
Child = pnl;
txtMessage = new Text(font, message);
txtMessage.ForeColor = textColor;
txtMessage.HorizontalAlignment = HorizontalAlignment.Center;
txtMessage.TextAlignment = TextAlignment.Center;
txtMessage.TextWrap = true;
txtMessage.SetMargin(3);
pnl.Children.Add(txtMessage);
StackPanel pnlButtons = new StackPanel(Orientation.Horizontal);
pnlButtons.HorizontalAlignment = HorizontalAlignment.Center;
pnlButtons.VerticalAlignment = VerticalAlignment.Bottom;
pnl.Children.Add(pnlButtons);
btn1 = new Button(font, "", null, buttonTextColor);
btn1.Background = buttonBackground;
btn1.ImageSize = 16;
btn1.HorizontalAlignment = HorizontalAlignment.Center;
btn1.SetMargin(3);
btn1.Clicked += new EventHandler(btn1_Clicked);
pnlButtons.Children.Add(btn1);
btn2 = new Button(font, "", null, buttonTextColor);
btn2.Background = buttonBackground;
btn2.ImageSize = 16;
btn2.HorizontalAlignment = HorizontalAlignment.Center;
btn2.SetMargin(3);
btn2.Clicked += new EventHandler(btn2_Clicked);
pnlButtons.Children.Add(btn2);
btn3 = new Button(font, "", null, buttonTextColor);
btn3.Background = buttonBackground;
btn3.ImageSize = 16;
btn3.HorizontalAlignment = HorizontalAlignment.Center;
btn3.SetMargin(3);
btn3.Clicked += new EventHandler(btn3_Clicked);
pnlButtons.Children.Add(btn3);
switch (buttonsSet)
{
case MessageBoxButton.OK:
btn1.Text = "OK";
btn2.Visibility = btn3.Visibility = Visibility.Collapsed;
break;
case MessageBoxButton.OKCancel:
btn1.Text = "OK";
btn2.Text = "Отмена";
btn3.Visibility = Visibility.Collapsed;
break;
case MessageBoxButton.YesNo:
btn1.Text = "Да";
btn2.Text = "Нет";
btn3.Visibility = Visibility.Collapsed;
break;
case MessageBoxButton.YesNoCancel:
btn1.Text = "Да";
btn2.Text = "Нет";
btn3.Text = "Отмена";
break;
}
//Top = (SystemMetrics.ScreenHeight - Height) / 2;
}
//
// instance implementation of PushFrame
private void PushFrameImpl(DispatcherFrame frame)
{
_frameDepth++;
try
{
while (frame.Continue)
{
DispatcherOperation op = null;
bool aborted = false;
//
// Dequeue the next operation if appropriate
if (_queue.Count > 0)
{
op = (DispatcherOperation)_queue.Dequeue();
//Must check aborted flag inside lock because
//user program could call op.Abort() between
//here and before the call to Invoke()
aborted = op.Status == DispatcherOperationStatus.Aborted;
}
if (op != null)
{
if (!aborted)
{
// Invoke the operation:
Debug.Assert(op._status == DispatcherOperationStatus.Pending);
// Mark this operation as executing.
op._status = DispatcherOperationStatus.Executing;
op._result = null;
try
{
op._result = op._method(op._args);
}
catch (Exception e)
{
if (_finalExceptionHandler == null ||
!_finalExceptionHandler(op, e))
{
throw;
}
}
// Mark this operation as completed.
op._status = DispatcherOperationStatus.Completed;
// Raise the Completed so anyone who is waiting will wake up.
op.OnCompleted();
}
}
else
{
_event.WaitOne();
}
}
}
finally
{
_frameDepth--;
// If this was the last frame to exit after a quit, we
// can now dispose the dispatcher.
if (_frameDepth == 0)
{
if (_hasShutdownStarted)
{
ShutdownImpl();
}
}
}
}
/// <summary>
/// Push an execution frame.
/// </summary>
/// <param name="frame">
/// The frame for the dispatcher to process.
/// </param>
public static void PushFrame(DispatcherFrame frame)
{
if (frame == null)
{
throw new ArgumentNullException("frame");
}
Dispatcher dispatcher = Dispatcher.CurrentDispatcher;
if (dispatcher._hasShutdownFinished)
{
throw new InvalidOperationException();
}
dispatcher.PushFrameImpl(frame);
}
