/// <summary>
/// Handle keys related to scrolling.
/// </summary>
/// <param name="key">The key to handle.</param>
/// <returns>A value indicating whether the key was handled.</returns>
private bool HandleScrollKeys(Key key)
{
ScrollViewer scrollHost = ItemsControlHelper.ScrollHost;
if (scrollHost != null)
{
switch (key)
{
case Key.PageUp:
// Move horizontally if we've run out of room vertically
if (!NumericExtensions.IsGreaterThan(scrollHost.ExtentHeight, scrollHost.ViewportHeight))
{
scrollHost.PageLeft();
}
else
{
scrollHost.PageUp();
}
return(true);
case Key.PageDown:
// Move horizontally if we've run out of room vertically
if (!NumericExtensions.IsGreaterThan(scrollHost.ExtentHeight, scrollHost.ViewportHeight))
{
scrollHost.PageRight();
}
else
{
scrollHost.PageDown();
}
return(true);
case Key.Home:
scrollHost.ScrollToTop();
return(true);
case Key.End:
scrollHost.ScrollToBottom();
return(true);
case Key.Left:
scrollHost.LineLeft();
return(true);
case Key.Right:
scrollHost.LineRight();
return(true);
case Key.Up:
scrollHost.LineUp();
return(true);
case Key.Down:
scrollHost.LineDown();
return(true);
}
}
return(false);
}
/// <summary>
/// If the control contains a ScrollViewer, this will reset the viewer
/// to be scrolled to the top.
/// </summary>
private void ResetScrollViewer()
{
if (SelectorControl != null)
{
ScrollViewer sv = SelectorControl.GetLogicalChildrenBreadthFirst().OfType <ScrollViewer>().FirstOrDefault();
if (sv != null)
{
sv.ScrollToTop();
}
}
}
public void Load(IPdfSource source, string password = null)
{
virtualPanel = VisualTreeHelperEx.FindChild<CustomVirtualizingPanel>(this);
scrollViewer = VisualTreeHelperEx.FindChild<ScrollViewer>(this);
virtualPanel.PageRowBounds = parent.PageRowBounds.Select(f => f.SizeIncludingOffset).ToArray();
imageProvider = new PdfImageProvider(source, parent.TotalPages,
new PageDisplaySettings(parent.GetPagesPerRow(), parent.ViewType, parent.HorizontalMargin,
parent.Rotation),
password: password);
if (parent.ZoomType == ZoomType.Fixed)
CreateNewItemsSource();
else if (parent.ZoomType == ZoomType.FitToHeight)
ZoomToHeight();
else if (parent.ZoomType == ZoomType.FitToWidth)
ZoomToWidth();
if (scrollViewer != null)
{
scrollViewer.Visibility = Visibility.Visible;
scrollViewer.ScrollToTop();
}
}
private bool HandleScrollKeys(Key key)
{
ScrollViewer scroller = ScrollHost;
if (scroller != null)
{
bool invert = (FlowDirection == FlowDirection.RightToLeft);
switch (key)
{
case Key.Up:
scroller.LineUp();
return(true);
case Key.Down:
scroller.LineDown();
return(true);
case Key.Left:
if (invert)
{
scroller.LineRight();
}
else
{
scroller.LineLeft();
}
return(true);
case Key.Right:
if (invert)
{
scroller.LineLeft();
}
else
{
scroller.LineRight();
}
return(true);
case Key.Home:
scroller.ScrollToTop();
return(true);
case Key.End:
scroller.ScrollToBottom();
return(true);
case Key.PageUp:
//if vertically scrollable - go vertical, otherwise horizontal
if (DoubleUtil.GreaterThan(scroller.ExtentHeight, scroller.ViewportHeight))
{
scroller.PageUp();
}
else
{
scroller.PageLeft();
}
return(true);
case Key.PageDown:
//if vertically scrollable - go vertical, otherwise horizontal
if (DoubleUtil.GreaterThan(scroller.ExtentHeight, scroller.ViewportHeight))
{
scroller.PageDown();
}
else
{
scroller.PageRight();
}
return(true);
}
}
return(false);
}
/// <summary>
/// If the control contains a ScrollViewer, this will reset the viewer
/// to be scrolled to the top.
/// </summary>
private void ResetScrollViewer()
{
ScrollViewer sv = SelectorControl?.GetLogicalChildrenBreadthFirst().OfType <ScrollViewer>().FirstOrDefault();
sv?.ScrollToTop();
}
/// <summary>
/// This is the command scroll adjustment code which synchronizes two ScrollViewer instances.
/// </summary>
/// <param name="sv">ScrollViewer to adjust</param>
/// <param name="e">Change in the source</param>
/// <param name="hadjust">Horizontal adjustment</param>
/// <param name="vadjust">Vertical adjustment</param>
private static void AdjustScrollPosition(ScrollViewer sv, ScrollChangedEventArgs e, double hadjust, double vadjust)
{
if (e.HorizontalChange != 0 || e.ExtentWidthChange != 0)
{
if (e.HorizontalOffset == 0)
sv.ScrollToLeftEnd();
else if (e.HorizontalOffset >= e.ExtentWidth-5)
sv.ScrollToRightEnd();
else if (e.ExtentWidth + hadjust == sv.ExtentWidth)
sv.ScrollToHorizontalOffset(e.HorizontalOffset + hadjust);
else
sv.ScrollToHorizontalOffset((sv.ExtentWidth * (e.HorizontalOffset / e.ExtentWidth)) + hadjust);
}
if (e.VerticalChange != 0 || e.ExtentHeightChange != 0)
{
if (e.VerticalOffset == 0)
sv.ScrollToTop();
else if (e.VerticalOffset >= e.ExtentHeight-5)
sv.ScrollToBottom();
else if (e.ExtentHeight + vadjust == sv.ExtentHeight)
sv.ScrollToVerticalOffset(e.VerticalOffset + vadjust);
else
sv.ScrollToVerticalOffset((sv.ExtentHeight * (e.VerticalOffset / e.ExtentHeight)) + vadjust);
}
}
internal static void ResetScrollPositions( ScrollViewer scrollViewer )
{
if( scrollViewer == null )
{
throw new ArgumentNullException( "scrollViewer" );
}
DataGridScrollViewer dataGridScrollViewer = scrollViewer as DataGridScrollViewer;
if( dataGridScrollViewer != null )
{
foreach( SynchronizedScrollViewer ssv in dataGridScrollViewer.SynchronizedScrollViewers )
{
ssv.ScrollToTop();
ssv.ScrollToLeftEnd();
}
}
scrollViewer.ScrollToTop();
scrollViewer.ScrollToLeftEnd();
}
/// <summary>
/// Handle keys related to scrolling.
/// </summary>
/// <param name="key">The key to handle.</param>
/// <returns>A value indicating whether the key was handled.</returns>
private bool HandleScrollKeys(Key key)
{
ScrollViewer scrollHost = ItemsControlHelper.ScrollHost;
if (scrollHost != null)
{
// Some keys (e.g. Left/Right) need to be translated in RightToLeft mode
Key invariantKey = InteractionHelper.GetLogicalKey(FlowDirection, key);
switch (invariantKey)
{
case Key.PageUp:
// Move horizontally if we've run out of room vertically
if (!NumericExtensions.IsGreaterThan(scrollHost.ExtentHeight, scrollHost.ViewportHeight))
{
scrollHost.PageLeft();
}
else
{
scrollHost.PageUp();
}
return(true);
case Key.PageDown:
// Move horizontally if we've run out of room vertically
if (!NumericExtensions.IsGreaterThan(scrollHost.ExtentHeight, scrollHost.ViewportHeight))
{
scrollHost.PageRight();
}
else
{
scrollHost.PageDown();
}
return(true);
case Key.Home:
scrollHost.ScrollToTop();
return(true);
case Key.End:
scrollHost.ScrollToBottom();
return(true);
case Key.Left:
scrollHost.LineLeft();
return(true);
case Key.Right:
scrollHost.LineRight();
return(true);
case Key.Up:
scrollHost.LineUp();
return(true);
case Key.Down:
scrollHost.LineDown();
return(true);
}
}
return(false);
}
// Token: 0x060058E9 RID: 22761 RVA: 0x00189730 File Offset: 0x00187930
private bool HandleScrollKeys(Key key)
{
ScrollViewer scrollHost = base.ScrollHost;
if (scrollHost != null)
{
bool flag = base.FlowDirection == FlowDirection.RightToLeft;
switch (key)
{
case Key.Prior:
if (DoubleUtil.GreaterThan(scrollHost.ExtentHeight, scrollHost.ViewportHeight))
{
scrollHost.PageUp();
}
else
{
scrollHost.PageLeft();
}
return(true);
case Key.Next:
if (DoubleUtil.GreaterThan(scrollHost.ExtentHeight, scrollHost.ViewportHeight))
{
scrollHost.PageDown();
}
else
{
scrollHost.PageRight();
}
return(true);
case Key.End:
scrollHost.ScrollToBottom();
return(true);
case Key.Home:
scrollHost.ScrollToTop();
return(true);
case Key.Left:
if (flag)
{
scrollHost.LineRight();
}
else
{
scrollHost.LineLeft();
}
return(true);
case Key.Up:
scrollHost.LineUp();
return(true);
case Key.Right:
if (flag)
{
scrollHost.LineLeft();
}
else
{
scrollHost.LineRight();
}
return(true);
case Key.Down:
scrollHost.LineDown();
return(true);
}
}
return(false);
}
