internal static AutoSplitAlignment GetAlignment(Point mousePosition, Point targetLocation, Size targetSize)
{
AutoSplitAlignment alignment = AutoSplitAlignment.None;
if (mousePosition.X >= targetLocation.X && mousePosition.X <= targetLocation.X + targetSize.Width)
{
alignment = AutoSplitAlignment.Vertical;
}
else if (mousePosition.Y >= targetLocation.Y && mousePosition.Y <= targetLocation.Y + targetSize.Height)
{
alignment = AutoSplitAlignment.Horizontal;
}
return(alignment);
}
internal static Point CalculateDropLocation(Point mousePosition, Point originalDropLocation, Size droppedSize, Point srcLocation, Point destLocation, Size srcSize, Size destSize, HashSet <Point> shapeLocations)
{
Point dropLocation = originalDropLocation;
double distToSrc = DesignerGeometryHelper.ManhattanDistanceBetweenPoints(mousePosition, new Point(srcLocation.X + (srcSize.Width / 2), srcLocation.Y + (srcSize.Height / 2)));
double distToDest = DesignerGeometryHelper.ManhattanDistanceBetweenPoints(mousePosition, new Point(destLocation.X + (destSize.Width / 2), destLocation.Y + (destSize.Height / 2)));
AutoSplitAlignment srcAlignment = GetAlignment(mousePosition, srcLocation, srcSize);
AutoSplitAlignment destAlignment = GetAlignment(mousePosition, destLocation, destSize);
if ((distToSrc <= distToDest || destAlignment == AutoSplitAlignment.None) && srcAlignment == AutoSplitAlignment.Vertical)
{
dropLocation = CalculateDropLocationToAlignVertically(dropLocation, droppedSize, srcLocation, srcSize);
}
else if ((distToSrc <= distToDest || destAlignment == AutoSplitAlignment.None) && srcAlignment == AutoSplitAlignment.Horizontal)
{
dropLocation = CalculateDropLocationToAlignHorizontally(dropLocation, droppedSize, srcLocation, srcSize);
}
else if ((distToSrc >= distToDest || srcAlignment == AutoSplitAlignment.None) && destAlignment == AutoSplitAlignment.Vertical)
{
dropLocation = CalculateDropLocationToAlignVertically(dropLocation, droppedSize, destLocation, destSize);
}
else if ((distToSrc >= distToDest || srcAlignment == AutoSplitAlignment.None) && destAlignment == AutoSplitAlignment.Horizontal)
{
dropLocation = CalculateDropLocationToAlignHorizontally(dropLocation, droppedSize, destLocation, destSize);
}
dropLocation.X = dropLocation.X < 0 ? 0 : dropLocation.X;
dropLocation.Y = dropLocation.Y < 0 ? 0 : dropLocation.Y;
// To avoid overlaps with existing shapes
if (shapeLocations != null)
{
while (shapeLocations.Contains(dropLocation))
{
dropLocation.Offset(FreeFormPanel.GridSize, FreeFormPanel.GridSize);
}
}
return(dropLocation);
}
