private void OnKeyDown(object sender, KeyEventArgs k)
{
if (PDFPageImageList != null && PDFPageImageList.Count > 0)
{
var ic = (ItemsControl)ScrollPDF.Content;
var itemWidth = ((ContentPresenter)ic.ItemContainerGenerator.
ContainerFromItem(ic.Items[0])).ActualWidth;
var numItemsShown = Math.Round(ActualWidth / itemWidth);
var maxScroll = (PDFPageImageList.Count - numItemsShown) * itemWidth;
// align offset to page
var offset = Math.Round(ScrollPDF.HorizontalOffset / itemWidth) * itemWidth;
if (k.Key == Key.Space || k.Key == Key.Right || k.Key == Key.Down)
{
ScrollPDF.ScrollToHorizontalOffset(
Math.Min(maxScroll, offset + itemWidth));
}
else if (k.Key == Key.Left || k.Key == Key.Up)
{
ScrollPDF.ScrollToHorizontalOffset(offset - itemWidth);
}
else if (k.Key == Key.Home)
{
ScrollPDF.ScrollToLeftEnd();
}
else if (k.Key == Key.End)
{
ScrollPDF.ScrollToHorizontalOffset(maxScroll);
//ScrollPDF.ScrollToRightEnd();
}
else if ((k.Key >= Key.D0 && k.Key <= Key.D9) ||
(k.Key >= Key.NumPad0 && k.Key <= Key.NumPad9))
{
int num;
if (int.TryParse(k.Key.ToString().First(
char.IsDigit).ToString(CultureInfo.InvariantCulture), out num))
{
var time = DateTime.Now.Ticks / TimeSpan.TicksPerMillisecond;
// 2 key within 200ms = double key press
if (time - lastKeyPressTime < 200)
{
num += lastKeyPressNumber * 10;
}
if (num != 0)
{
ScrollPDF.ScrollToHorizontalOffset((num - 1) * itemWidth);
}
lastKeyPressTime = time;
lastKeyPressNumber = num;
}
}
}
}
private void UpdateScaling()
{
if (PDFPageImageList == null || PagesToFit == 0)
{
ItemsMargin = new Thickness(0);
return;
}
var image = PDFPageImageList[0];
var screenWidth = ActualWidth - 2 * SystemParameters.ResizeFrameVerticalBorderWidth;
var screenHeight = ActualHeight -
(SystemParameters.WindowCaptionHeight
+ SystemParameters.ResizeFrameHorizontalBorderHeight
+ SystemParameters.HorizontalScrollBarHeight);
//var screenWidth = PDFContentArea.ActualWidth;
//var screenHeight = PDFContentArea.ActualHeight;
var screenAspect = screenWidth / screenHeight;
var pageWidth = image.PixelWidth;
var pageHeight = image.PixelHeight;
var pageAspect = ((double)PagesToFit * pageWidth) / pageHeight;
var newWidth = screenWidth;
var newHeight = screenHeight;
if (screenAspect > pageAspect) // need to reduce width
{
newWidth = screenHeight * pageAspect;
}
else // need to reduce height
{
newHeight = screenWidth / pageAspect;
}
var horiz = (screenWidth - newWidth) / 2.0;
var vert = (screenHeight - newHeight) / 2.0;
ItemsMargin = new Thickness(horiz, vert, horiz, vert);
var ic = (ItemsControl)ScrollPDF.Content;
var itemWidth = ((ContentPresenter)ic.ItemContainerGenerator.
ContainerFromItem(ic.Items[0])).ActualWidth;
if (itemWidth > double.Epsilon)
{
var offset = Math.Round(ScrollPDF.HorizontalOffset / itemWidth) * itemWidth;
ScrollPDF.ScrollToHorizontalOffset(offset);
}
}
