Tooltip on scrollviewer in documentviewer - wpf

Question

I have a documentviewer which i used in my wpf project to show xps document reports of having around 600 pages which is working great. But from user point of view i like to show the current page number as a tooltip on my scrollviewer while dragging the scroll stating the current page number in view. Somewhat like in a PDF file like this -
I was looking out for some ideas how to implement this. Just a current page number if not possible to show a thumbnail image would be good enough for me.
Is there any in-built support in documentviewer for this functionality??
Thanks for any help..

Answer 1

I cannot find anything like IsScrolling so i would approach it like this:
<Popup Name="docPopup" AllowsTransparency="True" PlacementTarget="{x:Reference docViewer}" Placement="Center">
<Border Background="Black" CornerRadius="5" Padding="10" BorderBrush="White" BorderThickness="1">
<TextBlock Foreground="White">
<Run Text="{Binding ElementName=docViewer, Path=MasterPageNumber, Mode=OneWay}"/>
<Run Text=" / "/>
<Run Text="{Binding ElementName=docViewer, Path=PageCount, Mode=OneWay}"/>
</TextBlock>
</Border>
</Popup>
<DocumentViewer Name="docViewer" ScrollViewer.ScrollChanged="docViewer_ScrollChanged"/>
The popup should be displayed when the document is scrolled, then it should fade out after some time. This is done in the handler:
DoubleAnimationUsingKeyFrames anim;
private void docViewer_ScrollChanged(object sender, ScrollChangedEventArgs e)
{
if (anim == null)
{
anim = new DoubleAnimationUsingKeyFrames();
anim.Duration = (Duration)TimeSpan.FromSeconds(1);
anim.KeyFrames.Add(new DiscreteDoubleKeyFrame(1, KeyTime.FromTimeSpan(TimeSpan.FromSeconds(0))));
anim.KeyFrames.Add(new DiscreteDoubleKeyFrame(1, KeyTime.FromTimeSpan(TimeSpan.FromSeconds(0.5))));
anim.KeyFrames.Add(new LinearDoubleKeyFrame(0, KeyTime.FromTimeSpan(TimeSpan.FromSeconds(1))));
}
anim.Completed -= anim_Completed;
docPopup.Child.BeginAnimation(UIElement.OpacityProperty, null);
docPopup.Child.Opacity = 1;
docPopup.IsOpen = true;
anim.Completed += anim_Completed;
docPopup.Child.BeginAnimation(UIElement.OpacityProperty, anim);
}
void anim_Completed(object sender, EventArgs e)
{
docPopup.IsOpen = false;
}
Edit: The event fires also on scrolls done via mouse-wheel etc. you could wrap everything in the handler in if (Mouse.LeftButton == MouseButtonState.Pressed), not 100% accurate but who scrolls with the MouseWheel while left-clicking?