I had a similar issue before. I could not use scrolling, touch and style in the same time. At the end I developped a custom ScrollViewer. It is easier than you think, since you only need to watch / change some basic methods.
In your case you can check whether the user pressed on an empy surface or a list item. If it is a list item, you need to check whether it was a short press (so, touchup also occured after touchdown) or a long one.
Scrolling can be configured with PanningMode. It allows you to scroll with finger all over the usercontrol.
Here is my version of scrollviewer. It turns scrolling mode off when user pressed a button and turned on afterwards.
public class ScrollViewerWithTouch : ScrollViewer
{
/// <summary>
/// Original panning mode.
/// </summary>
private PanningMode panningMode;
/// <summary>
/// Set panning mode only once.
/// </summary>
private bool panningModeSet;
/// <summary>
/// Initializes static members of the <see cref="ScrollViewerWithTouch"/> class.
/// </summary>
static ScrollViewerWithTouch()
{
DefaultStyleKeyProperty.OverrideMetadata(typeof(ScrollViewerWithTouch), new FrameworkPropertyMetadata(typeof(ScrollViewerWithTouch)));
}
protected override void OnManipulationCompleted(ManipulationCompletedEventArgs e)
{
base.OnManipulationCompleted(e);
// set it back
this.PanningMode = this.panningMode;
}
protected override void OnManipulationStarted(ManipulationStartedEventArgs e)
{
// figure out what has the user touched
var result = VisualTreeHelper.HitTest(this, e.ManipulationOrigin);
if (result != null && result.VisualHit != null)
{
var hasButtonParent = this.HasButtonParent(result.VisualHit);
// if user touched a button then turn off panning mode, let style bubble down, in other case let it scroll
this.PanningMode = hasButtonParent ? PanningMode.None : this.panningMode;
}
base.OnManipulationStarted(e);
}
protected override void OnTouchDown(TouchEventArgs e)
{
// store panning mode or set it back to it's original state. OnManipulationCompleted does not do it every time, so we need to set it once more.
if (this.panningModeSet == false)
{
this.panningMode = this.PanningMode;
this.panningModeSet = true;
}
else
{
this.PanningMode = this.panningMode;
}
base.OnTouchDown(e);
}
private bool HasButtonParent(DependencyObject obj)
{
var parent = VisualTreeHelper.GetParent(obj);
if ((parent != null) && (parent is ButtonBase) == false)
{
return HasButtonParent(parent);
}
return parent != null;
}
}