internal unsafe void DrawBackground(Gdi32.HDC dc, Rectangle bounds, Rectangle clipRectangle, IntPtr hwnd)
{
if (bounds.Width < 0 || bounds.Height < 0 || clipRectangle.Width < 0 || clipRectangle.Height < 0)
{
return;
}
if (IntPtr.Zero != hwnd)
{
using var htheme = new UxTheme.OpenThemeDataScope(hwnd, Class);
if (htheme.IsNull)
{
throw new InvalidOperationException(SR.VisualStyleHandleCreationFailed);
}
RECT rect = bounds;
RECT clipRect = clipRectangle;
_lastHResult = DrawThemeBackground(htheme, dc, Part, State, ref rect, &clipRect);
}
else
{
RECT rect = bounds;
RECT clipRect = clipRectangle;
_lastHResult = DrawThemeBackground(this, dc, Part, State, ref rect, &clipRect);
}
}
internal unsafe Size GetPartSize(Gdi32.HDC dc, ThemeSizeType type, IntPtr hwnd = default)
{
// Valid values are 0x0 to 0x2
SourceGenerated.EnumValidator.Validate(type, nameof(type));
if (DpiHelper.IsPerMonitorV2Awareness && hwnd != IntPtr.Zero)
{
using var htheme = new UxTheme.OpenThemeDataScope(hwnd, Class);
if (htheme.IsNull)
{
throw new InvalidOperationException(SR.VisualStyleHandleCreationFailed);
}
_lastHResult = GetThemePartSize(htheme, dc, Part, State, null, type, out Size dpiSize);
return(dpiSize);
}
_lastHResult = GetThemePartSize(this, dc, Part, State, null, type, out Size size);
return(size);
}
internal unsafe Size GetPartSize(Gdi32.HDC dc, ThemeSizeType type, IntPtr hwnd = default)
{
// Valid values are 0x0 to 0x2
if (!ClientUtils.IsEnumValid(type, (int)type, (int)ThemeSizeType.Minimum, (int)ThemeSizeType.Draw))
{
throw new InvalidEnumArgumentException(nameof(type), (int)type, typeof(ThemeSizeType));
}
if (DpiHelper.IsPerMonitorV2Awareness && hwnd != IntPtr.Zero)
{
using var htheme = new UxTheme.OpenThemeDataScope(hwnd, Class);
if (htheme.IsNull)
{
throw new InvalidOperationException(SR.VisualStyleHandleCreationFailed);
}
_lastHResult = GetThemePartSize(htheme, dc, Part, State, null, type, out Size dpiSize);
return(dpiSize);
}
_lastHResult = GetThemePartSize(this, dc, Part, State, null, type, out Size size);
return(size);
}