void OnOwnerMouseWheel(object sender, MouseWheelEventArgs e)
{
if ((Keyboard.Modifiers & ModifierKeys.Control) == 0)
{
e.Handled = true;
ISimpleManupulationSupport sms = this.owner as ISimpleManupulationSupport;
if (sms != null)
{
RenderScrollViewer rsv = this.owner as RenderScrollViewer;
if (rsv == null)
{
return;
}
bool vScroll = rsv.ComputedVerticalScrollBarVisibility == Visibility.Visible;
bool hScroll = rsv.ComputedHorizontalScrollBarVisibility == Visibility.Visible;
double delta = -e.Delta * 1.0;
if (vScroll)
{
sms.ScrollBy(0, delta, true);
}
else if (hScroll)
{
sms.ScrollBy(delta, 0, true);
}
}
}
else
{
e.Handled = true;
ISimpleManupulationSupport sms = this.owner as ISimpleManupulationSupport;
if (sms != null)
{
sms.ScaleBy((double)e.Delta, true);
}
}
}
void OnOwnerMouseMove(object sender, MouseEventArgs e)
{
if (!this.manipulationInProgress)
{
return;
}
mouseMoveHandled = true;
Point newPosition = e.GetPosition(this.owner);
ISimpleManupulationSupport sms = this.owner as ISimpleManupulationSupport;
if (sms != null)
{
sms.ScrollBy(this.lastPosition.X - newPosition.X, this.lastPosition.Y - newPosition.Y, true);
}
this.lastPosition = newPosition;
}
void OnOwnerManipulationDelta(object sender, ManipulationDeltaEventArgs e)
{
ISimpleManupulationSupport sms = this.owner as ISimpleManupulationSupport;
if (sms != null)
{
double sx = 1.0 + (e.DeltaManipulation.Scale.X - 1.0) / 1.0;
double sy = 1.0 + (e.DeltaManipulation.Scale.Y - 1.0) / 1.0;
double prec = 0.0005;
bool b1 = Math.Abs(sx - 1.0) <= prec;
bool b2 = Math.Abs(sy - 1.0) <= prec;
if (!b1 || !b2)
{
sms.ScaleBy(sx, false);
}
else
{
sms.ScrollBy(-e.DeltaManipulation.Translation.X, -e.DeltaManipulation.Translation.Y, false);
}
}
e.Handled = true;
}