public void DrawBackground(GraphicsContext dc, int partId, int stateId, Rect drawRect, Rect clipRect)
{
AssertPartDefined(partId, stateId);
using (StructureBuffer <Rect> clipRectPtr = new StructureBuffer <Rect>())
{
clipRectPtr.Value = clipRect;
int hr = NativeMethods.DrawThemeBackground(Handle, dc.Handle, partId, stateId, ref drawRect, clipRectPtr.Handle);
if (hr != 0)
{
Marshal.ThrowExceptionForHR(hr);
}
}
}
/// <summary>
/// Creates a new instance of Font.
/// </summary>
/// <param name="ptr">
/// The native handle to the font data.
/// </param>
public Font(IntPtr ptr)
{
Handle = ptr;
using (StructureBuffer <LOGFONT> logFontPtr = new StructureBuffer <LOGFONT>())
{
int returnedSize = NativeMethods.GetObject(Handle, logFontPtr.Size, logFontPtr.Handle);
if (logFontPtr.Size != returnedSize)
{
throw new InvalidOperationException($"GetObject() returned incorrect size (got {returnedSize} bytes, expected {logFontPtr.Size} bytes)");
}
mFontDescriptor = logFontPtr.Value;
}
}
public static Font CreateSystemUIFont()
{
using (StructureBuffer <NONCLIENTMETRICSW> metricsPtr = new StructureBuffer <NONCLIENTMETRICSW>())
{
const int SPI_GETNONCLIENTMETRICS = 0x29;
NONCLIENTMETRICSW metrics = new NONCLIENTMETRICSW();
metrics.cbSize = Marshal.SizeOf <NONCLIENTMETRICSW>();
metricsPtr.Value = metrics;
NativeMethods.SystemParametersInfoW(SPI_GETNONCLIENTMETRICS, metricsPtr.Size, metricsPtr.Handle, 0);
return(new Font(metricsPtr.Value.lfMessageFont));
}
}
public void ShowPopupMenu(Point windowRelativePosition, Control owner, PopupMenuFlags flags, Rect excludeRect)
{
Point screenPosition = windowRelativePosition;
bool success = NativeMethods.ClientToScreen(owner.Handle, ref screenPosition);
if (!success)
{
throw new System.ComponentModel.Win32Exception();
}
TPMPARAMS paramStruct = new TPMPARAMS();
paramStruct.cbStruct = Convert.ToUInt32(Marshal.SizeOf <TPMPARAMS>());
paramStruct.rcExclude = excludeRect;
using (StructureBuffer <TPMPARAMS> ptr = new StructureBuffer <TPMPARAMS>())
{
ptr.Value = paramStruct;
NativeMethods.TrackPopupMenuEx(Handle, (uint)flags, screenPosition.x, screenPosition.y, owner.Handle, ptr.Handle);
}
}
