How to sync Ctrl+mousewheel across controls? - wpf

Question

I have a class which handles a scrollbar PreviewMouseWheel event which zooms a timeline control, and everything works perfectly, except that I have to be over the scrollbar for the clr+mouse zoom to visually change the state of the scrollbar thumb. I have implemented the same PreviewMouseWheel event in the timeline control which has a different class for its datacontext, which zooms, but does not visually update the adjacent scrollbar control. What would be the best approach to handle the clr+mouse across the entire window?
public void ZoomScrollbar_PreviewMouseWheel(object sender, MouseWheelEventArgs e)
{
FrameworkElement el;
el = (FrameworkElement)sender;
if (Keyboard.Modifiers == ModifierKeys.Control)
{
var newValue = InitialZoomValue;
if(e.Delta > 0)
{
newValue += 1;
}
else
{
newValue -= 1;
}
OnZoomScroll(newValue);
InitialZoomValue = newValue;
}
}
<Style x:Key="TimelineToolboxStyle" TargetType="{x:Type controls:TimelineToolbox}">
<Setter Property="Template">
<Setter.Value>
<ControlTemplate TargetType="{x:Type controls:TimelineToolbox}">
<Grid x:Name="MainGrid">
<Grid.RowDefinitions>
<RowDefinition Height="10" />
<RowDefinition Height="*" />
<RowDefinition Height="10" />
</Grid.RowDefinitions>
<ScrollBar x:Name="ZoomScrollbar"
Grid.Row="1"
Minimum="1"
Maximum="12"
Value="{TemplateBinding InitialZoomValue}"
SmallChange="1"
Style="{DynamicResource ZoomScrollBarStyle}"
BorderThickness="9,0"
Width="22"
Margin="0"
BorderBrush="{x:Null}"
Background="Black"/>
</Grid>
</ControlTemplate>
</Setter.Value>
</Setter>
</Style>

Answer 1

I was able to get the mouse wheel to sync with the scrollbar by calling the scrollbar's PreviewMouseWheel event handler from code behind.
private void TimelineBand_PreviewMouseWheel(object sender, MouseWheelEventArgs e)
{
if (Keyboard.Modifiers == ModifierKeys.Control)
{
TimeLineToolBoxControl.ZoomScrollbar_PreviewMouseWheel(sender, e);
}
}