public MagnetEdge GetOppsiteEdge()
{
return(new MagnetEdge {
EdgeDir = MagnetUtils.OppsiteEdge(EdgeDir), End = End, Start = Start, Window = null
});
}
private int FindClosestEdge(MagnetEdge refEdge)
{
if (refEdge == null)
{
return(int.MinValue);
}
// get all forms edges list
var edges = Forms
.Where(frm => (frm != m_OriginalForm) && frm.Visible)
.SelectMany(MagnetUtils.FormToEdges)
.Where(t => !m_MoveLocks.Any(q => (q.Item1 == t.Window) && (q.Item2 == MagnetUtils.OppsiteEdge(t.EdgeDir))))
.ToList();
var corners = Forms
.Where(frm => (frm != m_OriginalForm) && frm.Visible)
.SelectMany(MagnetUtils.FormToCorners)
.Where(t => !m_ResizeLocks.Any(q => (q.Item1 == t.Window) && (q.Item2 == t.AttractsEdge)))
.ToList();
var bestDist = int.MaxValue;
foreach (var edge in edges)
{
var dist = edge.MeasureAttraction(refEdge);
if (dist != int.MinValue)
{
if (Math.Abs(dist) < bestDist)
{
bestDist = dist;
}
}
}
foreach (var corner in corners)
{
var dist = corner.MeasureAttraction(refEdge);
if (dist != int.MinValue)
{
if (Math.Abs(dist) < bestDist)
{
bestDist = dist;
}
}
}
return(bestDist);
}
protected override void WndProc(ref Message m)
{
if (m.Msg == WM_ENTERSIZEMOVE)
{
// Reset move tracking
var currRect = new WinRect();
GetWindowRect(Handle, ref currRect);
m_MoveSum = new Point(currRect.Left, currRect.Top);
m_MovePrevPos = new Point(currRect.Left, currRect.Top);
// Scan for move locks
m_MoveLocks.Clear();
var otherEdges = Forms
.Where(frm => (frm != m_OriginalForm) && frm.Visible)
.Where(frm => Forms.IndexOf(m_OriginalForm) == 0)
.SelectMany(MagnetUtils.FormToEdges).ToList();
var windowEdges = MagnetUtils.RectToEdges(currRect.ToRectangle());
foreach (var windowEdge in windowEdges)
{
foreach (var otherEdge in otherEdges)
{
if (windowEdge.MeasureAttraction(otherEdge) == 0)
{
m_MoveLocks.Add(new Tuple <Form, EdgeDirection>(otherEdge.Window, windowEdge.EdgeDir));
}
}
}
// Scan for resize locks
m_ResizeLocks.Clear();
foreach (var windowEdge in windowEdges)
{
foreach (var otherEdge in otherEdges)
{
if ((windowEdge.EdgeDir == otherEdge.EdgeDir) &&
((windowEdge.Start == otherEdge.End) ||
(windowEdge.End == otherEdge.Start)))
{
m_ResizeLocks.Add(new Tuple <Form, EdgeDirection>(otherEdge.Window, otherEdge.EdgeDir));
}
}
}
// Remove resize locks duplications
m_ResizeLocks = m_ResizeLocks.GroupBy(a => a.Item1.GetHashCode() ^ a.Item2.GetHashCode()).Select(grp => grp.First()).ToList();
}
else if (m.Msg == WM_SIZING)
{
var rc = (WinRect)Marshal.PtrToStructure(m.LParam, typeof(WinRect));
// Convert WinRect into edge list
var resizeRect = rc.ToRectangle();
var windowEdges = MagnetUtils.RectToEdges(resizeRect).ToDictionary(edge => edge.EdgeDir, edge => edge);
// Create resize map
var map = new Dictionary <int, EdgeDirection[]>
{
{ WMSZ_LEFT, new[] { EdgeDirection.Left } },
{ WMSZ_RIGHT, new[] { EdgeDirection.Right } },
{ WMSZ_TOP, new[] { EdgeDirection.Top } },
{ WMSZ_BOTTOM, new[] { EdgeDirection.Bottom } },
{ WMSZ_LEFT + WMSZ_TOP, new[] { EdgeDirection.Left, EdgeDirection.Top } },
{ WMSZ_LEFT + WMSZ_BOTTOM, new[] { EdgeDirection.Left, EdgeDirection.Bottom } },
{ WMSZ_RIGHT + WMSZ_TOP, new[] { EdgeDirection.Right, EdgeDirection.Top } },
{ WMSZ_RIGHT + WMSZ_BOTTOM, new[] { EdgeDirection.Right, EdgeDirection.Bottom } },
};
// Edge list
EdgeDirection[] edgeList;
if (!map.TryGetValue(m.WParam.ToInt32(), out edgeList))
{
edgeList = new EdgeDirection[0];
}
// Handle horizontal resize
foreach (var edgeDir in edgeList)
{
var movingEdge = windowEdges[edgeDir];
var magDistance = FindClosestEdge(movingEdge);
if (Math.Abs(magDistance) < 20)
{
resizeRect = MagnetUtils.ShiftRectangleEdge(resizeRect, edgeDir, magDistance);
}
}
// Rebuild new position edges
windowEdges = MagnetUtils.RectToEdges(resizeRect).ToDictionary(a => a.EdgeDir, a => a);
// Enforce resize locks
foreach (var resizeLock in m_ResizeLocks)
{
var otherRect = resizeLock.Item1.Bounds;
otherRect = MagnetUtils.SetRectangleEdge(otherRect, windowEdges[resizeLock.Item2]);
resizeLock.Item1.SetBounds(otherRect.X, otherRect.Y, otherRect.Width, otherRect.Height);
}
// Enfore move-on-resize windows
foreach (var moveLock in m_MoveLocks)
{
var otherRect = moveLock.Item1.Bounds;
otherRect = MagnetUtils.SetEntireRectangleEdge(otherRect, windowEdges[moveLock.Item2].GetOppsiteEdge());
moveLock.Item1.SetBounds(otherRect.X, otherRect.Y, otherRect.Width, otherRect.Height);
}
// Convert rect to LParam
rc = WinRect.FromRectangle(resizeRect);
Marshal.StructureToPtr(rc, m.LParam, true);
m.Result = new IntPtr(1);
}
else if (m.Msg == WM_MOVING)
{
var rc = (WinRect)Marshal.PtrToStructure(m.LParam, typeof(WinRect));
// Update MoveSum
m_MoveSum.X += rc.Left - m_MovePrevPos.X;
m_MoveSum.Y += rc.Top - m_MovePrevPos.Y;
// Convert WinRect into edge list
var moveRect = rc.ToRectangle();
moveRect.Location = m_MoveSum;
// Do magnetics twice, this has to be done so edge-to-edge works first and only then edge-to-corner works
for (int i = 0; i < 2; i++)
{
// Scan all edges directions and check if we can stick to other windows
foreach (EdgeDirection edgeType in Enum.GetValues(typeof(EdgeDirection)))
{
// Get edge info
var edge = MagnetUtils.RectToEdges(moveRect).First(t => t.EdgeDir == edgeType);
// Stick to other windows
var magDistance = FindClosestEdge(edge);
if (Math.Abs(magDistance) < 20)
{
moveRect = MagnetUtils.ShiftEntireRectangle(moveRect, edge.EdgeDir, magDistance);
}
}
}
// Move other windows
foreach (var lockedWindows in m_MoveLocks)
{
var otherRect = lockedWindows.Item1.Bounds;
otherRect.Offset(moveRect.Location.X - m_MovePrevPos.X, moveRect.Location.Y - m_MovePrevPos.Y);
lockedWindows.Item1.SetBounds(otherRect.X, otherRect.Y, otherRect.Width, otherRect.Height);
}
// Save position to track delta
m_MovePrevPos = moveRect.Location;
// Convert rect to LParam
rc = WinRect.FromRectangle(moveRect);
Marshal.StructureToPtr(rc, m.LParam, true);
m.Result = new IntPtr(1);
}
base.WndProc(ref m);
}