public static void CreateRegion(IntPtr hWnd, int radius, RoundStyle roundStyle, bool redraw)
{
var lpRect = new RECT();
NativeMethods.GetWindowRect(hWnd, ref lpRect);
var rect = new Rectangle(Point.Empty, lpRect.Size);
if (roundStyle != RoundStyle.None)
{
using (var path = DrawHelper.CreateRoundPath(rect, radius, roundStyle, true)) //
{
using (var region = new Region(path))
{
path.Widen(Pens.White);
region.Union(path);
var windowDC = NativeMethods.GetWindowDC(hWnd);
try
{
using (var graphics = Graphics.FromHdc(windowDC))
{
NativeMethods.SetWindowRgn(hWnd, region.GetHrgn(graphics), redraw);
}
}
finally
{
NativeMethods.ReleaseDC(hWnd, windowDC);
}
}
return;
}
}
var hRgn = NativeMethods.CreateRectRgn(0, 0, rect.Width, rect.Height);
NativeMethods.SetWindowRgn(hWnd, hRgn, redraw);
}
private void WmNcpaint(ref Message m)
{
base.WndProc(ref m);
checked
{
if (this.RenderWithVisualStyles())
{
int iPartId = 1;
int iStateId;
if (base.Enabled)
{
if (base.ReadOnly)
{
iStateId = 6;
}
else
{
iStateId = 1;
}
}
else
{
iStateId = 4;
}
NativeMethods.RECT rECT;
NativeMethods.GetWindowRect(base.Handle, out rECT);
rECT.Right -= rECT.Left;
rECT.Bottom -= rECT.Top;
rECT.Top = (rECT.Left = 0);
IntPtr windowDC = NativeMethods.GetWindowDC(base.Handle);
NativeMethods.RECT rECT2 = rECT;
rECT2.Left += this.borderRect.Left;
rECT2.Top += this.borderRect.Top;
rECT2.Right -= this.borderRect.Right;
rECT2.Bottom -= this.borderRect.Bottom;
NativeMethods.ExcludeClipRect(windowDC, rECT2.Left, rECT2.Top, rECT2.Right, rECT2.Bottom);
IntPtr hTheme = NativeMethods.OpenThemeData(base.Handle, "EDIT");
if (NativeMethods.IsThemeBackgroundPartiallyTransparent(hTheme, 1, 1) != 0)
{
NativeMethods.DrawThemeParentBackground(base.Handle, windowDC, ref rECT);
}
NativeMethods.DrawThemeBackground(hTheme, windowDC, iPartId, iStateId, ref rECT, IntPtr.Zero);
NativeMethods.CloseThemeData(hTheme);
NativeMethods.ReleaseDC(base.Handle, windowDC);
m.Result = IntPtr.Zero;
}
}
}
private void WmNccalcsize(ref Message m)
{
base.WndProc(ref m);
if (this.RenderWithVisualStyles())
{
NativeMethods.NCCALCSIZE_PARAMS nCCALCSIZE_PARAMS = default(NativeMethods.NCCALCSIZE_PARAMS);
NativeMethods.RECT rECT;
if (m.WParam == IntPtr.Zero)
{
rECT = (NativeMethods.RECT)Marshal.PtrToStructure(m.LParam, typeof(NativeMethods.RECT));
}
else
{
nCCALCSIZE_PARAMS = (NativeMethods.NCCALCSIZE_PARAMS)Marshal.PtrToStructure(m.LParam, typeof(NativeMethods.NCCALCSIZE_PARAMS));
rECT = nCCALCSIZE_PARAMS.rgrc0;
}
IntPtr windowDC = NativeMethods.GetWindowDC(base.Handle);
IntPtr hTheme = NativeMethods.OpenThemeData(base.Handle, "EDIT");
NativeMethods.RECT rECT2;
if (NativeMethods.GetThemeBackgroundContentRect(hTheme, windowDC, 1, 1, ref rECT, out rECT2) == 0)
{
rECT2.Inflate(-1, -1);
this.borderRect = checked (new NativeMethods.RECT(rECT2.Left - rECT.Left, rECT2.Top - rECT.Top, rECT.Right - rECT2.Right, rECT.Bottom - rECT2.Bottom));
if (m.WParam == IntPtr.Zero)
{
Marshal.StructureToPtr(rECT2, m.LParam, false);
}
else
{
nCCALCSIZE_PARAMS.rgrc0 = rECT2;
Marshal.StructureToPtr(nCCALCSIZE_PARAMS, m.LParam, false);
}
m.Result = new IntPtr(768);
}
NativeMethods.CloseThemeData(hTheme);
NativeMethods.ReleaseDC(base.Handle, windowDC);
}
}
