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DWMWINDOWATTRIBUTE enumeration (dwmapi.h)

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Options used by the DwmGetWindowAttribute and DwmSetWindowAttribute functions.

Syntax

typedef enum DWMWINDOWATTRIBUTE {
  DWMWA_NCRENDERING_ENABLED,
  DWMWA_NCRENDERING_POLICY,
  DWMWA_TRANSITIONS_FORCEDISABLED,
  DWMWA_ALLOW_NCPAINT,
  DWMWA_CAPTION_BUTTON_BOUNDS,
  DWMWA_NONCLIENT_RTL_LAYOUT,
  DWMWA_FORCE_ICONIC_REPRESENTATION,
  DWMWA_FLIP3D_POLICY,
  DWMWA_EXTENDED_FRAME_BOUNDS,
  DWMWA_HAS_ICONIC_BITMAP,
  DWMWA_DISALLOW_PEEK,
  DWMWA_EXCLUDED_FROM_PEEK,
  DWMWA_CLOAK,
  DWMWA_CLOAKED,
  DWMWA_FREEZE_REPRESENTATION,
  DWMWA_PASSIVE_UPDATE_MODE,
  DWMWA_USE_HOSTBACKDROPBRUSH,
  DWMWA_USE_IMMERSIVE_DARK_MODE = 20,
  DWMWA_WINDOW_CORNER_PREFERENCE = 33,
  DWMWA_BORDER_COLOR,
  DWMWA_CAPTION_COLOR,
  DWMWA_TEXT_COLOR,
  DWMWA_VISIBLE_FRAME_BORDER_THICKNESS,
  DWMWA_SYSTEMBACKDROP_TYPE,
  DWMWA_LAST
} ;

Constants

 
DWMWA_NCRENDERING_ENABLED
Use with DwmGetWindowAttribute. Discovers whether non-client rendering is enabled. The retrieved value is of type BOOL. TRUE if non-client rendering is enabled; otherwise, FALSE.
DWMWA_NCRENDERING_POLICY
Use with DwmSetWindowAttribute. Sets the non-client rendering policy. The pvAttribute parameter points to a value from the DWMNCRENDERINGPOLICY enumeration.
DWMWA_TRANSITIONS_FORCEDISABLED
Use with DwmSetWindowAttribute. Enables or forcibly disables DWM transitions. The pvAttribute parameter points to a value of type BOOL. TRUE to disable transitions, or FALSE to enable transitions.
DWMWA_ALLOW_NCPAINT
Use with DwmSetWindowAttribute. Enables content rendered in the non-client area to be visible on the frame drawn by DWM. The pvAttribute parameter points to a value of type BOOL. TRUE to enable content rendered in the non-client area to be visible on the frame; otherwise, FALSE.
DWMWA_CAPTION_BUTTON_BOUNDS
Use with DwmGetWindowAttribute. Retrieves the bounds of the caption button area in the window-relative space. The retrieved value is of type RECT. If the window is minimized or otherwise not visible to the user, then the value of the RECT retrieved is undefined. You should check whether the retrieved RECT contains a boundary that you can work with, and if it doesn't then you can conclude that the window is minimized or otherwise not visible.
DWMWA_NONCLIENT_RTL_LAYOUT
Use with DwmSetWindowAttribute. Specifies whether non-client content is right-to-left (RTL) mirrored. The pvAttribute parameter points to a value of type BOOL. TRUE if the non-client content is right-to-left (RTL) mirrored; otherwise, FALSE.
DWMWA_FORCE_ICONIC_REPRESENTATION
Use with DwmSetWindowAttribute. Forces the window to display an iconic thumbnail or peek representation (a static bitmap), even if a live or snapshot representation of the window is available. This value is normally set during a window's creation, and not changed throughout the window's lifetime. Some scenarios, however, might require the value to change over time. The pvAttribute parameter points to a value of type BOOL. TRUE to require a iconic thumbnail or peek representation; otherwise, FALSE.
DWMWA_FLIP3D_POLICY
Use with DwmSetWindowAttribute. Sets how Flip3D treats the window. The pvAttribute parameter points to a value from the DWMFLIP3DWINDOWPOLICY enumeration.
DWMWA_EXTENDED_FRAME_BOUNDS
Use with DwmGetWindowAttribute. Retrieves the extended frame bounds rectangle in screen space. The retrieved value is of type RECT.
DWMWA_HAS_ICONIC_BITMAP
Use with DwmSetWindowAttribute. The window will provide a bitmap for use by DWM as an iconic thumbnail or peek representation (a static bitmap) for the window. DWMWA_HAS_ICONIC_BITMAP can be specified with DWMWA_FORCE_ICONIC_REPRESENTATION. DWMWA_HAS_ICONIC_BITMAP normally is set during a window's creation and not changed throughout the window's lifetime. Some scenarios, however, might require the value to change over time. The pvAttribute parameter points to a value of type BOOL. TRUE to inform DWM that the window will provide an iconic thumbnail or peek representation; otherwise, FALSE.

Windows Vista and earlier: This value is not supported.
DWMWA_DISALLOW_PEEK
Use with DwmSetWindowAttribute. Do not show peek preview for the window. The peek view shows a full-sized preview of the window when the mouse hovers over the window's thumbnail in the taskbar. If this attribute is set, hovering the mouse pointer over the window's thumbnail dismisses peek (in case another window in the group has a peek preview showing). The pvAttribute parameter points to a value of type BOOL. TRUE to prevent peek functionality, or FALSE to allow it.

Windows Vista and earlier: This value is not supported.
DWMWA_EXCLUDED_FROM_PEEK
Use with DwmSetWindowAttribute. Prevents a window from fading to a glass sheet when peek is invoked. The pvAttribute parameter points to a value of type BOOL. TRUE to prevent the window from fading during another window's peek, or FALSE for normal behavior.

Windows Vista and earlier: This value is not supported.
DWMWA_CLOAK
Use with DwmSetWindowAttribute. Cloaks the window such that it is not visible to the user. The window is still composed by DWM.

Using with DirectComposition: Use the DWMWA_CLOAK flag to cloak the layered child window when animating a representation of the window's content via a DirectComposition visual that has been associated with the layered child window. For more details on this usage case, see How to animate the bitmap of a layered child window.

Windows 7 and earlier: This value is not supported.
DWMWA_CLOAKED
Use with DwmGetWindowAttribute. If the window is cloaked, provides one of the following values explaining why.

DWM_CLOAKED_APP (value 0x00000001). The window was cloaked by its owner application.

DWM_CLOAKED_SHELL (value 0x00000002). The window was cloaked by the Shell.

DWM_CLOAKED_INHERITED (value 0x00000004). The cloak value was inherited from its owner window.

Windows 7 and earlier: This value is not supported.
DWMWA_FREEZE_REPRESENTATION
Use with DwmSetWindowAttribute. Freeze the window's thumbnail image with its current visuals. Do no further live updates on the thumbnail image to match the window's contents.

Windows 7 and earlier: This value is not supported.
DWMWA_USE_HOSTBACKDROPBRUSH
Use with DwmSetWindowAttribute. Enables a non-UWP window to use host backdrop brushes. If this flag is set, then a Win32 app that calls Windows::UI::Composition APIs can build transparency effects using the host backdrop brush (see Compositor.CreateHostBackdropBrush). The pvAttribute parameter points to a value of type BOOL. TRUE to enable host backdrop brushes for the window, or FALSE to disable it.

This value is supported starting with Windows 11 Build 22000.
DWMWA_USE_IMMERSIVE_DARK_MODE
Use with DwmSetWindowAttribute. Allows the window frame for this window to be drawn in dark mode colors when the dark mode system setting is enabled. For compatibility reasons, all windows default to light mode regardless of the system setting. The pvAttribute parameter points to a value of type BOOL. TRUE to honor dark mode for the window, FALSE to always use light mode.

This value is supported starting with Windows 11 Build 22000.
DWMWA_WINDOW_CORNER_PREFERENCE
Use with DwmSetWindowAttribute. Specifies the rounded corner preference for a window. The pvAttribute parameter points to a value of type DWM_WINDOW_CORNER_PREFERENCE.

This value is supported starting with Windows 11 Build 22000.
DWMWA_BORDER_COLOR
Use with DwmSetWindowAttribute. Specifies the color of the window border. The pvAttribute parameter points to a value of type COLORREF. The app is responsible for changing the border color according to state changes, such as a change in window activation.

Specifying DWMWA_COLOR_NONE (value 0xFFFFFFFE) for the color will suppress the drawing of the window border. This makes it possible to have a rounded window with no border.

Specifying DWMWA_COLOR_DEFAULT (value 0xFFFFFFFF) for the color will reset the window back to using the system's default behavior for the border color.

This value is supported starting with Windows 11 Build 22000.
DWMWA_CAPTION_COLOR
Use with DwmSetWindowAttribute. Specifies the color of the caption. The pvAttribute parameter points to a value of type COLORREF.

Specifying DWMWA_COLOR_DEFAULT (value 0xFFFFFFFF) for the color will reset the window back to using the system's default behavior for the caption color.

This value is supported starting with Windows 11 Build 22000.
DWMWA_TEXT_COLOR
Use with DwmSetWindowAttribute. Specifies the color of the caption text. The pvAttribute parameter points to a value of type COLORREF.

Specifying DWMWA_COLOR_DEFAULT (value 0xFFFFFFFF) for the color will reset the window back to using the system's default behavior for the caption text color.

This value is supported starting with Windows 11 Build 22000.
DWMWA_VISIBLE_FRAME_BORDER_THICKNESS
Use with DwmGetWindowAttribute. Retrieves the width of the outer border that the DWM would draw around this window. The value can vary depending on the DPI of the window. The pvAttribute parameter points to a value of type UINT.

This value is supported starting with Windows 11 Build 22000.
DWMWA_SYSTEMBACKDROP_TYPE
Use with DwmGetWindowAttribute or DwmSetWindowAttribute. Retrieves or specifies the system-drawn backdrop material of a window, including behind the non-client area. The pvAttribute parameter points to a value of type DWM_SYSTEMBACKDROP_TYPE.

This value is supported starting with Windows 11 Build 22621.
DWMWA_LAST
The maximum recognized DWMWINDOWATTRIBUTE value, used for validation purposes.

Requirements

Requirement Value
Minimum supported client Windows Vista [desktop apps only]
Minimum supported server Windows Server 2008 [desktop apps only]
Header dwmapi.h

See also