Package com.formdev.flatlaf.ui

Class FlatNativeWindowsLibrary

java.lang.Object

com.formdev.flatlaf.ui.FlatNativeWindowsLibrary

public class FlatNativeWindowsLibrary
extends Object

Native methods for Windows.

Note: This is private API. Do not use!

Since:

3.1

Field Summary

Fields

Modifier and Type	Field	Description
static int	DWMWCP_DEFAULT	DWM_WINDOW_CORNER_PREFERENCE see https://learn.microsoft.com/en-us/windows/win32/api/dwmapi/ne-dwmapi-dwm_window_corner_preference
static int	DWMWCP_DONOTROUND	DWM_WINDOW_CORNER_PREFERENCE see https://learn.microsoft.com/en-us/windows/win32/api/dwmapi/ne-dwmapi-dwm_window_corner_preference
static int	DWMWCP_ROUND	DWM_WINDOW_CORNER_PREFERENCE see https://learn.microsoft.com/en-us/windows/win32/api/dwmapi/ne-dwmapi-dwm_window_corner_preference
static int	DWMWCP_ROUNDSMALL	DWM_WINDOW_CORNER_PREFERENCE see https://learn.microsoft.com/en-us/windows/win32/api/dwmapi/ne-dwmapi-dwm_window_corner_preference

Constructor Summary

Constructors

Constructor	Description
FlatNativeWindowsLibrary()

Method Summary

Modifier and Type	Method	Description
static long	getHWND(Window window)	Gets the Windows window handle (HWND) for the given Swing window.
static long	getOSBuildNumber()	Gets the Windows operating system build number.
static boolean	isLoaded()
static boolean	setWindowBorderColor(long hwnd, int red, int green, int blue)	Sets the color of the window border.
static boolean	setWindowCornerPreference(long hwnd, int cornerPreference)	Sets the rounded corner preference for the window.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

DWMWCP_DEFAULT

public static final int DWMWCP_DEFAULT

DWM_WINDOW_CORNER_PREFERENCE see https://learn.microsoft.com/en-us/windows/win32/api/dwmapi/ne-dwmapi-dwm_window_corner_preference

See Also:

Constant Field Values

DWMWCP_DONOTROUND

public static final int DWMWCP_DONOTROUND

DWM_WINDOW_CORNER_PREFERENCE see https://learn.microsoft.com/en-us/windows/win32/api/dwmapi/ne-dwmapi-dwm_window_corner_preference

See Also:

Constant Field Values

DWMWCP_ROUND

public static final int DWMWCP_ROUND

DWM_WINDOW_CORNER_PREFERENCE see https://learn.microsoft.com/en-us/windows/win32/api/dwmapi/ne-dwmapi-dwm_window_corner_preference

See Also:

Constant Field Values

DWMWCP_ROUNDSMALL

public static final int DWMWCP_ROUNDSMALL

DWM_WINDOW_CORNER_PREFERENCE see https://learn.microsoft.com/en-us/windows/win32/api/dwmapi/ne-dwmapi-dwm_window_corner_preference

See Also:

Constant Field Values

Constructor Detail

FlatNativeWindowsLibrary

public FlatNativeWindowsLibrary()

Method Detail

isLoaded

public static boolean isLoaded()

getOSBuildNumber

public static long getOSBuildNumber()

Gets the Windows operating system build number.

Invokes Win32 API method GetVersionEx() and returns OSVERSIONINFO.dwBuildNumber. See https://learn.microsoft.com/en-us/windows/win32/api/sysinfoapi/nf-sysinfoapi-getversionexa

getHWND

public static long getHWND(Window window)

Gets the Windows window handle (HWND) for the given Swing window.

Note that the underlying Windows window must be already created, otherwise this method returns zero. Use following to ensure this:

 if( !window.isDisplayable() )
     window.addNotify();
 

or invoke this method after packing the window. E.g.

 window.pack();
 long hwnd = getHWND( window );
 

setWindowCornerPreference

public static boolean setWindowCornerPreference(long hwnd,
                                                int cornerPreference)

Sets the rounded corner preference for the window. Allowed values are DWMWCP_DEFAULT, DWMWCP_DONOTROUND, DWMWCP_ROUND and DWMWCP_ROUNDSMALL.

Invokes Win32 API method DwmSetWindowAttribute(DWMWA_WINDOW_CORNER_PREFERENCE). See https://learn.microsoft.com/en-us/windows/win32/api/dwmapi/nf-dwmapi-dwmsetwindowattribute

Supported since Windows 11 Build 22000.

setWindowBorderColor

public static boolean setWindowBorderColor(long hwnd,
                                           int red,
                                           int green,
                                           int blue)

Sets the color of the window border. The red/green/blue values must be in range 0 - 255. If red is -1, then the system default border color is used (useful to reset the border color). If red is -2, then no border is painted.

Invokes Win32 API method DwmSetWindowAttribute(DWMWA_BORDER_COLOR). See https://learn.microsoft.com/en-us/windows/win32/api/dwmapi/nf-dwmapi-dwmsetwindowattribute

Supported since Windows 11 Build 22000.