WPF Addict

Synchronize Listbox SelectedItem with component

18/08/2016 admin Aucun commentaire

For synchronize SelectedItem with focused component in DataTemplate for exemple

 <ListBox VerticalContentAlignment="Stretch"
          HorizontalContentAlignment="Stretch">
          <ListBox.ItemContainerStyle>
              <Style TargetType="{x:Type ListBoxItem}">
                  <Style.Triggers>
                      <Trigger Property="IsKeyboardFocusWithin"
                               Value="True">
                          <Setter Property="IsSelected"
                                    Value="True" />
                      </Trigger>
                  </Style.Triggers>
              </Style>
          </ListBox.ItemContainerStyle>
</ListBox>

<ListBox VerticalContentAlignment="Stretch"

HorizontalContentAlignment="Stretch">

<ListBox.ItemContainerStyle>

<Style.Triggers>

<Trigger Property="IsKeyboardFocusWithin"

Value="True">

<Setter Property="IsSelected"

Value="True" />

</Trigger>

</Style.Triggers>

</Style>

</ListBox.ItemContainerStyle>

</ListBox>

Categories: wpf Tags: item, listbox, selecteditem, xaml

DoEvents WPF

10/08/2016 admin Aucun commentaire

here is the common code for having DoEvents() function for WPF

#region DoEvents
private static DispatcherOperationCallback exitFrameCallback = new DispatcherOperationCallback(ExitFrame);

/// <summary> 
/// Processes all UI messages currently in the message queue.
/// </summary>

public static void DoEvents()
{
	// Create new nested message pump.

	DispatcherFrame nestedFrame = new DispatcherFrame();

	// Dispatch a callback to the current message queue, when getting called,
	// this callback will end the nested message loop.
	// note that the priority of this callback should be lower than the that of UI event messages.

	DispatcherOperation exitOperation = Dispatcher.CurrentDispatcher.BeginInvoke(
	DispatcherPriority.Background, exitFrameCallback, nestedFrame);

	// pump the nested message loop, the nested message loop will
	// immediately process the messages left inside the message queue.

	Dispatcher.PushFrame(nestedFrame);

	// If the "exitFrame" callback doesn't get finished, Abort it.

	if (exitOperation.Status != DispatcherOperationStatus.Completed)
	{
		exitOperation.Abort();
	}
}

private static Object ExitFrame(Object state)
{
	DispatcherFrame frame = state as DispatcherFrame;

	// Exit the nested message loop.

	frame.Continue = false;
	return null;
}
#endregion

#region DoEvents

private static DispatcherOperationCallback exitFrameCallback = new DispatcherOperationCallback(ExitFrame);

/// <summary>

/// Processes all UI messages currently in the message queue.

/// </summary>

public static void DoEvents()

{

// Create new nested message pump.

DispatcherFrame nestedFrame = new DispatcherFrame();

// Dispatch a callback to the current message queue, when getting called,

// this callback will end the nested message loop.

// note that the priority of this callback should be lower than the that of UI event messages.

DispatcherOperation exitOperation = Dispatcher.CurrentDispatcher.BeginInvoke(

DispatcherPriority.Background, exitFrameCallback, nestedFrame);

// pump the nested message loop, the nested message loop will

// immediately process the messages left inside the message queue.

Dispatcher.PushFrame(nestedFrame);

// If the "exitFrame" callback doesn't get finished, Abort it.

if (exitOperation.Status != DispatcherOperationStatus.Completed)

{

exitOperation.Abort();

}

private static Object ExitFrame(Object state)

{

DispatcherFrame frame = state as DispatcherFrame;

// Exit the nested message loop.

frame.Continue = false;

return null;

}

#endregion

place this in App class and use App.DoEvents();

Categories: wpf Tags: c#

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