private Dock GetHitSide(MetroStartPage targetPage, MetroTile hitTile, MetroTile dragTile, Point pos)
{
// For vertically oriented pages, if dragging a small tile and the hit tile is also small,
// treat as if horizontal oriented.
if (targetPage.Orientation == Orientation.Vertical && !(hitTile.Type == MetroTileType.Small && dragTile.Type == MetroTileType.Small))
{
double dY = (hitTile.RenderSize.Height / 2) - pos.Y;
if (dY > 0)
{
return(Dock.Top);
}
return(Dock.Bottom);
}
else
{
double dX = (hitTile.RenderSize.Width / 2) - pos.X;
if (dX > 0)
{
return(Dock.Left);
}
return(Dock.Right);
}
}
private void ClearDropTargetState(MetroTile tile)
{
VisualStateManager.GoToState(tile, "NoDrop", true);
}
private void UpdateDropTargetTiles(MetroTile newDropTarget, MetroTile newDropTarget2, MetroTile newSecondary, MetroTile newSecondary2, Dock side)
{
if (!IsOneOfOrNull(_DropTargetTile, newDropTarget, newDropTarget2, newSecondary, newSecondary2))
{
ClearDropTargetState(_DropTargetTile);
}
if (!IsOneOfOrNull(_DropTargetTile2, newDropTarget, newDropTarget2, newSecondary, newSecondary2))
{
ClearDropTargetState(_DropTargetTile2);
}
if (!IsOneOfOrNull(_SecondaryDropTargetTile, newDropTarget, newDropTarget2, newSecondary, newSecondary2))
{
ClearDropTargetState(_SecondaryDropTargetTile);
}
if (!IsOneOfOrNull(_SecondaryDropTargetTile2, newDropTarget, newDropTarget2, newSecondary, newSecondary2))
{
ClearDropTargetState(_SecondaryDropTargetTile2);
}
_DropTargetTile = newDropTarget;
_DropTargetTile2 = newDropTarget2;
_SecondaryDropTargetTile = newSecondary;
_SecondaryDropTargetTile2 = newSecondary2;
if (_DropTargetTile != null)
{
SetDropTargetState(_DropTargetTile, side);
}
if (_DropTargetTile2 != null)
{
SetDropTargetState(_DropTargetTile2, side);
}
if (_SecondaryDropTargetTile != null)
{
SetDropTargetState(_SecondaryDropTargetTile, OppositeSide(side));
}
if (_SecondaryDropTargetTile2 != null)
{
SetDropTargetState(_SecondaryDropTargetTile2, OppositeSide(side));
}
}
private MetroTile FindSecondaryTargetTile(MetroStartPage targetPage, MetroTile targetTile, MetroTile dragTile, Dock hitSide, out int dropIndex)
{
int targetIndex = targetPage.ItemContainerGenerator.IndexFromContainer(targetTile);
dropIndex = targetIndex;
if (targetTile == _DragHelper._DragTile)
{
return(null);
}
int sourceIndex = targetPage.ItemContainerGenerator.IndexFromContainer(dragTile);
if (sourceIndex < 0)
{
sourceIndex = int.MaxValue;
}
int secondaryIndex = -1;
if (hitSide == Dock.Top)
{
if (!IsTileOnPageTop(targetPage, targetTile))
{
secondaryIndex = targetIndex - 1;
}
if (sourceIndex < targetIndex)
{
dropIndex--;
}
}
else if (hitSide == Dock.Bottom)
{
if (!IsTileOnPageBottom(targetPage, targetTile))
{
secondaryIndex = targetIndex + 1;
}
if (sourceIndex > targetIndex)
{
dropIndex++;
}
}
else if (hitSide == Dock.Left)
{
if (!IsTileOnPageLeft(targetPage, targetTile))
{
secondaryIndex = targetIndex - 1;
}
if (sourceIndex < targetIndex)
{
dropIndex--;
}
}
else if (hitSide == Dock.Right)
{
if (!IsTileOnPageRight(targetPage, targetTile))
{
secondaryIndex = targetIndex + 1;
}
if (sourceIndex > targetIndex)
{
dropIndex++;
}
}
MetroTile secondary = null;
if (secondaryIndex >= 0 && secondaryIndex < targetPage.Items.Count)
{
secondary = targetPage.ItemContainerGenerator.ContainerFromIndex(secondaryIndex) as MetroTile;
// special case handling for when dropping small tile into empty space beside another small tile,
// in this situation there should be no secondary.
if (secondary != null && secondary.Type != MetroTileType.Small && secondary != dragTile && targetTile.Type == MetroTileType.Small && dragTile.Type == MetroTileType.Small)
{
secondary = null;
}
}
return(secondary);
}
private void SetDropTargetTiles(Point position, MetroStartPage dropTargetPage)
{
var dragTile = _DragHelper._DragTile;
bool suppressAnimation = false;
MetroTile secondaryTarget = null, target2 = null, secondaryTarget2 = null;
var target = dropTargetPage.HitTestForOne <MetroTile>(position, _DragHelper._DragTile.Margin);
if (target == null && dragTile.Type == MetroTileType.Small)
{
target = dropTargetPage.HitTestForOne <MetroTile>(position, new Thickness(0, 0, dragTile.Width, 0));
if (target != null && target.Type == MetroTileType.Large)
{
target = null;
}
suppressAnimation = true;
}
Dock hitSide = Dock.Left;
if (target != null)
{
hitSide = GetHitSide(dropTargetPage, target, dragTile, dropTargetPage.TranslatePoint(position, target));
// If vertical orientation, and hitting a small tile, there might be another small tile beside it which also needs to be animated.
if (_DropPage.Orientation == Orientation.Vertical && target.Type == MetroTileType.Small && dragTile.Type == MetroTileType.Large)
{
int index, adjacentIndex;
target2 = FindAdjacentSmallTile(target, out index, out adjacentIndex);
if (target2 != null)
{
// Might need to switch target and target2 because target defines the insertion index.
if ((hitSide == Dock.Top && adjacentIndex < index) || (hitSide == Dock.Bottom && adjacentIndex > index))
{
var temp = target;
target = target2;
target2 = temp;
}
}
}
// Look for secondary drop target if not dropping onto self or not dropping one small tile onto another small tile.
secondaryTarget = FindSecondaryTargetTile(dropTargetPage, target, dragTile, hitSide, out _DropIndex);
if (secondaryTarget != null && _DropPage.Orientation == Orientation.Vertical && secondaryTarget.Type == MetroTileType.Small && dragTile.Type == MetroTileType.Large)
{
int index, adjacentIndex;
secondaryTarget2 = FindAdjacentSmallTile(secondaryTarget, out index, out adjacentIndex);
}
}
else
{
_DropIndex = _DropPage.Items.Count;
if (_DragHelper._DragSourcePage == _DropPage)
{
_DropIndex--;
}
}
if (!suppressAnimation)
{
UpdateDropTargetTiles(target, target2, secondaryTarget, secondaryTarget2, hitSide);
}
else
{
UpdateDropTargetTiles(null, null, null, null, Dock.Left);
}
}