private bool SetValueStartDrag(
Func <IInputElement, Point> getPosition,
Action <UIElement> captureDevice)
{
if (!_canDrag)
{
return(false);
}
try
{
_isDragStarting = true;
var originTrackPoint = getPosition(_track);
var newValue = _track.ValueFromPoint(originTrackPoint);
newValue = Math.Min(this.Maximum, Math.Max(this.Minimum, Math.Round(newValue)));
if (newValue == this.Value)
{
return(false);
}
// Set new value.
_updateValue.Invoke(this, new object[] { newValue });
}
finally
{
_isDragStarting = false;
}
// Reproduce Thumb.OnMouseLeftButtonDown method.
if (!_thumb.IsDragging)
{
// Start drag operation for Thumb.
_thumb.Focus();
captureDevice(_thumb);
_thumbIsDragging.SetValue(_thumb, true);
var originThumbPoint = getPosition(_thumb);
var originThumbPointToScreen = _thumb.PointToScreen(originThumbPoint);
//_thumbOriginThumbPoint.SetValue(_thumb, originThumbPoint);
_thumbPreviousScreenCoordPosition.SetValue(_thumb, originThumbPointToScreen);
_thumbOriginScreenCoordPosition.SetValue(_thumb, originThumbPointToScreen);
try
{
_thumb.RaiseEvent(new DragStartedEventArgs(originThumbPoint.X, originThumbPoint.Y));
}
catch
{
_thumb.CancelDrag();
throw;
}
}
return(true);
}
private void OnThumbPointerPressed(object sender, PointerRoutedEventArgs e)
{
Thumb thumb = sender as Thumb;
if (thumb != null && thumb.IsTabStop)
{
if (thumb.FocusState == FocusState.Unfocused)
{
thumb.Focus(FocusState.Programmatic);
}
}
}
protected virtual bool SetValueStartDrag(
Func <IInputElement, Point> getPosition,
Action <UIElement> captureDevice)
{
if (!CanDrag)
{
return(false);
}
if (!this.IsFocused)
{
this.Focus();
}
var originTrackPoint = getPosition(_track);
var newValue = _track.ValueFromPoint(originTrackPoint);
if (UpdateValue(newValue))
{
return(false);
}
// Reproduce Thumb.OnMouseLeftButtonDown method.
if (!_thumb.IsDragging)
{
// Start drag operation for Thumb.
_thumb.Focus();
captureDevice(_thumb);
_thumbIsDragging.SetValue(_thumb, true);
var originThumbPoint = getPosition(_thumb);
var originThumbPointToScreen = _thumb.PointToScreen(originThumbPoint);
//_thumbOriginThumbPoint.SetValue(_thumb, originThumbPoint);
_thumbPreviousScreenCoordPosition.SetValue(_thumb, originThumbPointToScreen);
_thumbOriginScreenCoordPosition.SetValue(_thumb, originThumbPointToScreen);
try
{
// Trigger Thumb.DragStartedEvent event.
_thumb.RaiseEvent(new DragStartedEventArgs(originThumbPoint.X, originThumbPoint.Y));
}
catch
{
_thumb.CancelDrag();
throw;
}
}
return(true);
}
void OnClickOnSmallOrLargeDecreaseIncreaseButtons(double amountByWhichToIncreaseOrDecreaseTheValue, ScrollEventType scrollEventType)
{
double newValue = CoerceValue(this.Value + amountByWhichToIncreaseOrDecreaseTheValue);
if (newValue != this.Value)
{
this.SetCurrentValue(RangeBase.ValueProperty, newValue); // Note: we do not use "this.Value = newValue" because it deletes any bindings that the user may have set to the scrollbar with <ScrollBar Value="{Binding...}"/>.
if (this.Scroll != null)
{
this.Scroll(this, new ScrollEventArgs(newValue, scrollEventType));
}
}
if (Orientation == Orientation.Horizontal)
{
_horizontalThumb.Focus();
}
else
{
_verticalThumb.Focus();
}
}
