DwmExtendFrameIntoClientArea without Aero Glass

Question

Using the DwmExtendFrameIntoClientArea API call with Aero Glass enabled works just fine. However, I want it to work when Aero Glass is disabled as well, like how it

Answer 1

You need to paint the window background yourself. You should not actually hard-code the colors as previous posts have suggested, but use the theme functions to retrieve them, like so (semi-pseudocode):

DWORD rgb;
HANDLE hTheme = OpenThemeData(GetDesktopWindow(), L"WINDOW");
GetThemeColor(hTheme, WP_CAPTION, CS_ACTIVE,
     ? TMT_FILLCOLORHINT : TMT_BORDERCOLORHINT, &rgb);

// Can use these functions to retrieve the individual RGB values
BYTE r = GetRValue(rgb);
BYTE g = GetGValue(rgb);
BYTE b = GetBValue(rgb);

These colors will remain correct even if the user changes title bar colors in the control panel (unlike using COLOR_ACTIVECAPTION / COLOR_GRADIENTACTIVECAPTION). You should also check that themes are active using IsThemeActive() before attempting to get theme colors.

The values of the constants for quick reference:

• WP_CAPTION: 1
• CS_ACTIVE: 1
• TMT_FILLCOLORHINT: 3821
• TMT_BORDERCOLORHINT: 3822