protected override void OnVisualChildrenChanged(DependencyObject visualAdded, DependencyObject visualRemoved)
{
base.OnVisualChildrenChanged(visualAdded, visualRemoved);
if (visualAdded != null)
{
FrameworkElement visual = visualAdded as FrameworkElement;
Canvas.SetZIndex(visual, _maxZIndex);
visual.RenderTransform = new TranslateTransform();
visual.VerticalAlignment = Windows.VerticalAlignment.Top;
visual.HorizontalAlignment = Windows.HorizontalAlignment.Left;
visual.MouseDown += (s, e) =>
{
double currentZIndex = Canvas.GetZIndex(visual);
Canvas.SetZIndex(visual, ++_maxZIndex);
_isMouseDownOnChild = true;
_mouseClickedChild = visual;
_dragMoveStartMargin = visual.Margin;
_dragMoveStartedPageIndex = _currentPageIndex;
_dragMoveStartPosition = e.GetPosition(null);
};
visual.MouseMove += (s, e) =>
{
if (AllowDragMoveChild && _isMouseDownOnChild && e.LeftButton == Input.MouseButtonState.Pressed && s.Equals(_mouseClickedChild))
{
Point currentMousePosition = e.GetPosition(null);
double diffX = currentMousePosition.X - _dragMoveStartPosition.X;
double diffY = currentMousePosition.Y - _dragMoveStartPosition.Y;
Thickness tempMargin = _dragMoveStartMargin;
tempMargin.Left = _dragMoveStartMargin.Left + diffX;
tempMargin.Top = _dragMoveStartMargin.Top + diffY;
visual.Margin = tempMargin;
double mouseXPostion = e.GetPosition(this).X;
if (mouseXPostion < 50)
{
if (!_isAnimating)
{
NavigateToPreviousPage();
}
}
else if (mouseXPostion > this.ActualWidth - 50)
{
if (!_isAnimating)
{
NavigateToNextPage();
}
}
}
};
visual.MouseUp += (s, e) =>
{
if (_isMouseDownOnChild && _mouseClickedChild.Equals(visual))
{
e.Handled = true;
_isMouseDownOnChild = false;
int pageIndex = _currentPageIndex;
Thickness margin = visual.Margin;
margin.Left += (_currentPageIndex - _dragMoveStartedPageIndex) * this.Width;
//_dragMovedElements[visual] = margin;
visual.Margin = margin;
Duration tempDuration = NavigationAnimationDuration;
NavigationAnimationDuration = new Duration(TimeSpan.FromSeconds(0));
NavigateToPage(pageIndex, true);
NavigationAnimationDuration = tempDuration;
}
};
}
}
