/// <summary>
/// The AdornerWindow intercepts all designer-related messages and forwards them to the BehaviorService
/// for appropriate actions. Note that Paint and HitTest messages are correctly parsed and translated
/// to AdornerWindow coords.
/// </summary>
protected override void WndProc(ref Message m)
{
//special test hooks
if (m.Msg == (int)WM_GETALLSNAPLINES)
{
_behaviorService.TestHook_GetAllSnapLines(ref m);
}
else if (m.Msg == (int)WM_GETRECENTSNAPLINES)
{
_behaviorService.TestHook_GetRecentSnapLines(ref m);
}
switch ((User32.WM)m.Msg)
{
case User32.WM.PAINT:
{
// Stash off the region we have to update.
using var hrgn = new Gdi32.RegionScope(0, 0, 0, 0);
User32.GetUpdateRgn(m.HWnd, hrgn, BOOL.TRUE);
// The region we have to update in terms of the smallest rectangle that completely encloses
// the update region of the window gives us the clip rectangle.
RECT clip = new RECT();
User32.GetUpdateRect(m.HWnd, ref clip, BOOL.TRUE);
Rectangle paintRect = clip;
using Region region = hrgn.CreateGdiPlusRegion();
// Call the base class to do its painting.
DefWndProc(ref m);
// Now do our own painting.
using Graphics g = Graphics.FromHwnd(m.HWnd);
using PaintEventArgs pevent = new PaintEventArgs(g, paintRect);
g.Clip = region;
_behaviorService.PropagatePaint(pevent);
break;
}
case User32.WM.NCHITTEST:
Point pt = PARAM.ToPoint(m.LParamInternal);
var pt1 = new Point();
pt1 = PointToClient(pt1);
pt.Offset(pt1.X, pt1.Y);
if (_behaviorService.PropagateHitTest(pt) && !ProcessingDrag)
{
m.ResultInternal = (nint)User32.HT.TRANSPARENT;
}
else
{
m.ResultInternal = (nint)User32.HT.CLIENT;
}
break;
case User32.WM.CAPTURECHANGED:
base.WndProc(ref m);
_behaviorService.OnLoseCapture();
break;
default:
base.WndProc(ref m);
break;
}
}