public bool UpdateView(Point hitPoint, bool clear)
{
if (clear)
{
Clear();
return(false);
}
Point testPoint = _DragHelper.TranslateHitPoint(hitPoint, _DragHelper._MetroControlPanel);
_DropPage = _DragHelper._MetroControlPanel.HitTestForOne <MetroStartPage>(testPoint);
if (_DropPage == null)
{
Clear();
return(false);
}
SetDropTargetTiles(_DragHelper.TranslateHitPoint(hitPoint, _DropPage), _DropPage);
return(true);
}
public bool DoScroll(Point hitPoint)
{
Point pos = _DragHelper.TranslateHitPoint(hitPoint, _ScrollViewer);
if (pos.Y >= 0 && pos.Y <= _ScrollViewer.ActualHeight)
{
IsScrolling = UpdateScroll(pos.X);
}
else
{
StopStoryboard(true);
IsScrolling = false;
_LastMousePosition = Double.NaN;
}
return(IsScrolling);
}
private bool SpreadPages(Point hitPoint)
{
MetroStartPage pageLeft = null, pageRight = null;
bool doSearch = true;
var testPoint = _DragHelper.TranslateHitPoint(hitPoint, _DragHelper._MetroControlPanel);
if (testPoint.Y < 0 || testPoint.Y > _DragHelper._MetroControlPanel.ActualHeight)
{
doSearch = false;
}
var hitPage = _DragHelper._MetroControlPanel.HitTestForOne <MetroStartPage>(testPoint);
if (hitPage != null)
{
if (hitPage.MainContent != null)
{
var contentPos = _DragHelper.TranslateHitPoint(hitPoint, hitPage.MainContent);
if (contentPos.X < 0)
{
pageRight = hitPage;
}
else if (contentPos.X > hitPage.MainContent.ActualWidth)
{
pageLeft = hitPage;
}
}
}
if (doSearch)
{
int leftIndex = 0;
if (pageLeft != null)
{
leftIndex = _DragHelper._MetroControl.ItemContainerGenerator.IndexFromContainer(pageLeft) + 1;
}
int rightIndex = _DragHelper._MetroControl.Items.Count;
if (pageRight != null)
{
rightIndex = _DragHelper._MetroControl.ItemContainerGenerator.IndexFromContainer(pageRight);
}
for (int i = leftIndex; i < rightIndex; i++)
{
var page = _DragHelper._MetroControlPanel.Children[i] as MetroStartPage;
// Pages are separated by margins on grids defined in their templates. The
// grids don't have background set so drag events make it through. Here we're
// getting the visible portion of the page against which to test mouse position.
var visible = page.MainContent;
if (visible == null)
{
visible = page;
}
var hitPos = _DragHelper.TranslateHitPoint(hitPoint, visible);
if (visible.IsPointWithin(hitPos))
{
pageLeft = pageRight = null;
break;
}
else if (hitPos.X < 0)
{
pageRight = page;
break;
}
else if (hitPos.X > visible.ActualWidth)
{
pageLeft = page;
}
}
if (_DragHelper._DragSourcePage.Items.Count == 1 && (pageLeft == _DragHelper._DragSourcePage || pageRight == _DragHelper._DragSourcePage))
{
pageRight = pageLeft = null;
}
}
if (pageLeft != _SpreadPageLeft)
{
if (_SpreadPageLeft != null)
{
VisualStateManager.GoToState(_SpreadPageLeft, "NoSpread", true);
}
if (pageLeft != null)
{
VisualStateManager.GoToState(pageLeft, "SpreadLeft", true);
}
_SpreadPageLeft = pageLeft;
}
if (pageRight != _SpreadPageRight)
{
if (_SpreadPageRight != null)
{
VisualStateManager.GoToState(_SpreadPageRight, "NoSpread", true);
}
if (pageRight != null)
{
VisualStateManager.GoToState(pageRight, "SpreadRight", true);
}
_SpreadPageRight = pageRight;
}
return(pageLeft != null || pageRight != null);
}