private static void HandleDatePickerDialogKey(object sender, DialogKeyEventArgs e)
{
// If the DatePicker is dropped down and Enter or Escape are pressed, we should
// cancel or commit the selection change rather than allowing the default button
// or cancel button to be invoked.
DatePicker datePicker = (DatePicker)sender;
if ((e.Key == Key.Enter || e.Key == Key.Escape) && datePicker.IsDropDownOpen)
{
e.Handled = true;
}
}
private static void HandleComboBoxDialogKey(object sender, DialogKeyEventArgs e)
{
// If the ComboBox is dropped down and Enter or Escape are pressed, we should
// cancel or commit the selection change rather than allowing the default button
// or cancel button to be invoked.
ComboBox comboBox = (ComboBox)sender;
if ((e.Key == Key.Enter || e.Key == Key.Escape) && comboBox.IsDropDownOpen)
{
e.Handled = true;
}
}
IntPtr SourceHook(IntPtr hwnd, int msg, IntPtr wParam, IntPtr lParam, ref bool handled)
{
// Handle WM_GETDLGCODE in order to allow for arrow and tab navigation inside the dialog page.
// By returning this code, Windows will pass arrow and tab keys to our HWND instead of handling
// them for its own default tab and directional navigation.
switch (msg)
{
case NativeMethods.WM_GETDLGCODE:
int dlgCode = NativeMethods.DLGC_WANTARROWS | NativeMethods.DLGC_WANTTAB | NativeMethods.DLGC_WANTCHARS;
// Ask the currently-focused element if it wants to handle all keys or not. The DialogKeyPendingEvent
// is a routed event starting with the focused control. If any control in the route handles
// this message, then we'll add DLGC_WANTALLKEYS to request that this pending message
// be delivered to our content instead of the default dialog procedure.
IInputElement currentElement = Keyboard.FocusedElement;
if (currentElement != null)
{
DialogKeyEventArgs args = new DialogKeyEventArgs(DialogKeyPendingEvent, KeyInterop.KeyFromVirtualKey(wParam.ToInt32()));
currentElement.RaiseEvent(args);
if (args.Handled)
{
dlgCode |= NativeMethods.DLGC_WANTALLKEYS;
}
}
handled = true;
return new IntPtr(dlgCode);
}
return IntPtr.Zero;
}