/// <summary>
/// Get the size of a themed part in a givenstate.
/// </summary>
/// <param name="g">Graphics object reference.</param>
/// <param name="part">Theme part.</param>
/// <param name="state">Theme state of part.</param>
/// <param name="themeSize">How to calculate the size.</param>
/// <returns>new Size if themed; otherwise Size.Empty</returns>
public Size GetThemePartSize(Graphics g, int part, int state, THEMESIZE themeSize)
{
Size retSize = Size.Empty;
if (IsControlThemed)
{
Win32.SIZE size = new Win32.SIZE();
IntPtr hDC = g.GetHdc();
Uxtheme.GetThemePartSize(_hTheme, hDC, part, state, IntPtr.Zero, themeSize, ref size);
g.ReleaseHdc(hDC);
// Copy back results
retSize.Width = size.cx;
retSize.Height = size.cy;
}
return(retSize);
}
public static extern IntPtr GetThemePartSize(SafeThemeHandle hTheme, IntPtr hdc, int iPartId, int iStateId, IntPtr prc, THEMESIZE eSize, ref Size psz);
public static extern int GetThemePartSize([NativeTypeName("HTHEME")] IntPtr hTheme, [NativeTypeName("HDC")] IntPtr hdc, int iPartId, int iStateId, [NativeTypeName("LPCRECT")] RECT *prc, [NativeTypeName("enum THEMESIZE")] THEMESIZE eSize, SIZE *psz);
public static extern IntPtr GetThemePartSize(IntPtr hTheme, IntPtr hdc, ThemeParts iPartId, int iStateId,
IntPtr prc, THEMESIZE eSize, out SIZE psz);
public static extern IntPtr GetThemePartSize(IntPtr hTheme, IntPtr hdc, ThemeParts iPartId, int iStateId,
[MarshalAs(UnmanagedType.Struct)] SIZE prc, THEMESIZE eSize, out SIZE psz);
public static extern int GetThemePartSize(IntPtr hTheme, IntPtr hdc, int iPartId, int iStateId, ref RECT prc, THEMESIZE eSize, ref SIZE psz);
public static extern int GetThemePartSize(HandleRef hTheme, HandleRef hdc, int iPartId, int iStateId, IntPtr prc, THEMESIZE eSize, ref SIZE psz);
public static extern HRESULT GetThemePartSize(HTHEME hTheme, HDC hdc, int iPartId, int iStateId, [NativeTypeName("LPCRECT")] RECT *prc, [NativeTypeName("enum THEMESIZE")] THEMESIZE eSize, SIZE *psz);
private static extern int GetThemePartSize(IntPtr hTheme, IntPtr hdc, int iPartId, int iStateId, ref Rectangle prc, THEMESIZE eSize, ref Size psz);
public Size?GetPartSize(IDeviceContext graphics, int partId, int stateId, Rectangle?destRect, THEMESIZE themeSize)
{
using (var hdc = new SafeDCHandle(graphics))
{
if (GetThemePartSize(hTheme, hdc, partId, stateId, destRect, themeSize, out var sz).Succeeded)
{
return(sz);
}
return(null);
}
}
