Hi,
The "IsTabStop" property is not designed for this purpose it's for navigating from different UI components by using the TAB key. It will take the focus from canvas and hold it which may introduce the issue. I suggest you to implement the "scroll via arrow keys" function in following way.
1. Set the necessary listeners to the PARENT WINDOW
Code:
KeyDown += PDFReaderPage_KeyDown;
LostFocus += PDFReaderPage_LostFocus;
2. Deal with focus lost event
Code:
private void PDFReaderPage_LostFocus(object sender, RoutedEventArgs e)
{
Focus(FocusState.Keyboard);
}
3 Deal with the key down event
Code:
private void PDFReaderPage_KeyDown(object sender, KeyRoutedEventArgs e)
{
if (e.Key == Windows.System.VirtualKey.Down)
{
PDFPos pos = m_view.vGetPos(0, 0);
m_view.vSetPos(pos, 0, -50);
}
else if (e.Key == Windows.System.VirtualKey.Up)
{
PDFPos pos = m_view.vGetPos(0, 0);
m_view.vSetPos(pos, 0, 50);
}
}
