public virtual void OrganiseOnDragCompleted(DragablzItemsControl requestor, Size measureBounds,
IEnumerable <DragablzItem> siblingItems, DragablzItem dragItem)
{
if (siblingItems == null)
{
throw new ArgumentNullException("siblingItems");
}
var currentLocations = siblingItems
.Select(GetLocationInfo)
.Union(new[] { GetLocationInfo(dragItem) })
.OrderBy(loc => loc.Item == dragItem ? loc.Start : _siblingItemLocationOnDragStart[loc.Item].Start);
var currentCoord = 0.0;
var z = int.MaxValue;
var logicalIndex = 0;
foreach (var location in currentLocations)
{
SetLocation(location.Item, currentCoord);
currentCoord += _getDesiredSize(location.Item) + _itemOffset;
Panel.SetZIndex(location.Item, --z);
location.Item.LogicalIndex = logicalIndex++;
}
Panel.SetZIndex(dragItem, int.MaxValue);
}
public virtual void OrganiseOnMouseDownWithin(DragablzItemsControl requestor, Size measureBounds, List <DragablzItem> siblingItems, DragablzItem dragablzItem)
{
var zIndex = int.MaxValue;
foreach (var source in siblingItems.OrderByDescending(Panel.GetZIndex))
{
Panel.SetZIndex(source, --zIndex);
}
Panel.SetZIndex(dragablzItem, int.MaxValue);
}
public virtual void Organise(DragablzItemsControl requestor, Size measureBounds, IOrderedEnumerable <DragablzItem> items)
{
if (items == null)
{
throw new ArgumentNullException("items");
}
OrganiseInternal(
requestor,
measureBounds,
items);
}
public virtual void OrganiseOnDragStarted(DragablzItemsControl requestor, Size measureBounds,
IEnumerable <DragablzItem> siblingItems, DragablzItem dragItem)
{
if (siblingItems == null)
{
throw new ArgumentNullException("siblingItems");
}
if (dragItem == null)
{
throw new ArgumentNullException("dragItem");
}
_siblingItemLocationOnDragStart = siblingItems.Select(GetLocationInfo).ToDictionary(loc => loc.Item);
}
public virtual Point ConstrainLocation(DragablzItemsControl requestor, Size measureBounds, Point itemCurrentLocation, Size itemCurrentSize, Point itemDesiredLocation, Size itemDesiredSize)
{
//we will stop it pushing beyond the bounds...unless it's already beyond...
var reduceBoundsWidth = itemCurrentLocation.X + itemCurrentSize.Width > measureBounds.Width
? 0
: itemDesiredSize.Width;
var reduceBoundsHeight = itemCurrentLocation.Y + itemCurrentSize.Height > measureBounds.Height
? 0
: itemDesiredSize.Height;
return(new Point(
Math.Min(Math.Max(itemDesiredLocation.X, 0), measureBounds.Width - reduceBoundsWidth),
Math.Min(Math.Max(itemDesiredLocation.Y, 0), measureBounds.Height - reduceBoundsHeight)));
}
public virtual void Organise(DragablzItemsControl requestor, Size measureBounds, IEnumerable <DragablzItem> items)
{
if (items == null)
{
throw new ArgumentNullException("items");
}
OrganiseInternal(
requestor,
measureBounds,
items.Select((di, idx) => new Tuple <int, DragablzItem>(idx, di))
.OrderBy(tuple => tuple,
MultiComparer <Tuple <int, DragablzItem> > .Ascending(tuple => _getLocation(tuple.Item2))
.ThenAscending(tuple => tuple.Item1))
.Select(tuple => tuple.Item2));
}
public virtual Point ConstrainLocation(DragablzItemsControl requestor, Size measureBounds, Point itemCurrentLocation,
Size itemCurrentSize, Point itemDesiredLocation, Size itemDesiredSize)
{
var fixedItems = requestor.FixedItemCount;
var lowerBound = fixedItems == 0
? -1d
: GetLocationInfo(requestor.DragablzItems()
.Take(fixedItems)
.Last()).End + _itemOffset - 1;
return(new Point(
_orientation == Orientation.Vertical
? 0
: Math.Min(Math.Max(lowerBound, itemDesiredLocation.X), (measureBounds.Width) + 1),
_orientation == Orientation.Horizontal
? 0
: Math.Min(Math.Max(lowerBound, itemDesiredLocation.Y), (measureBounds.Height) + 1)
));
}
public virtual Size Measure(DragablzItemsControl requestor, Size availableSize, IEnumerable <DragablzItem> items)
{
if (items == null)
{
throw new ArgumentNullException("items");
}
var size = new Size(double.PositiveInfinity, double.PositiveInfinity);
double width = 0, height = 0;
var isFirst = true;
foreach (var dragablzItem in items)
{
dragablzItem.Measure(size);
if (_orientation == Orientation.Horizontal)
{
width += !dragablzItem.IsLoaded ? dragablzItem.DesiredSize.Width : dragablzItem.ActualWidth;
if (!isFirst)
{
width += _itemOffset;
}
height = Math.Max(height,
!dragablzItem.IsLoaded ? dragablzItem.DesiredSize.Height : dragablzItem.ActualHeight);
}
else
{
width = Math.Max(width,
!dragablzItem.IsLoaded ? dragablzItem.DesiredSize.Width : dragablzItem.ActualWidth);
height += !dragablzItem.IsLoaded ? dragablzItem.DesiredSize.Height : dragablzItem.ActualHeight;
if (!isFirst)
{
height += _itemOffset;
}
}
isFirst = false;
}
return(new Size(Math.Max(width, 0), Math.Max(height, 0)));
}
private void OrganiseInternal(DragablzItemsControl requestor, Size measureBounds,
IEnumerable <DragablzItem> items)
{
var currentCoord = 0.0;
var z = int.MaxValue;
var logicalIndex = 0;
foreach (var newItem in items)
{
Panel.SetZIndex(newItem, newItem.IsSelected ? int.MaxValue : --z);
SetLocation(newItem, currentCoord);
newItem.LogicalIndex = logicalIndex++;
newItem.Measure(measureBounds);
var desiredSize = _getDesiredSize(newItem);
if (desiredSize == 0.0)
{
desiredSize = 1.0; //no measure? create something to help sorting
}
currentCoord += desiredSize + _itemOffset;
}
}
public virtual void OrganiseOnMouseDownWithin(DragablzItemsControl requestor, Size measureBounds,
List <DragablzItem> siblingItems, DragablzItem dragablzItem)
{
}
public virtual Size Measure(DragablzItemsControl requestor, Size availableSize, IEnumerable <DragablzItem> items)
{
return(availableSize);
}
public virtual void OrganiseOnDragCompleted(DragablzItemsControl requestor, Size measureBounds, IEnumerable <DragablzItem> siblingItems, DragablzItem dragItem)
{
}
public virtual void Organise(DragablzItemsControl requestor, Size measureBounds, IOrderedEnumerable <DragablzItem> items)
{
}