WM_THEMECHANGED message

Broadcast to every window following a theme change event. Examples of theme change events are the activation of a theme, the deactivation of a theme, or a transition from one theme to another.

#define WM_THEMECHANGED                 0x031A

Parameters

wParam

This parameter is reserved.

lParam

This parameter is reserved.

Return value

Type: LRESULT

If an application processes this message, it should return zero.

Remarks

A window receives this message through its WindowProc function.

Themes are specifications for the appearance of controls, so that the visual element of a control is treated separately from its functionality.

To release an existing theme handle, call CloseThemeData. To acquire a new theme handle, use OpenThemeData.

Following the WM_THEMECHANGED broadcast, any existing theme handles are invalid. A theme-aware window should release and reopen any of its pre-existing theme handles when it receives the WM_THEMECHANGED message. If the OpenThemeData function returns NULL, the window should paint unthemed.

Requirements

See also

Other Resources

CloseThemeData

IsThemeActive

OpenThemeData