Windows 11: use rounded popups with system border and system drop shadow

flatlaf-natives/flatlaf-natives-windows/src/main/cpp/FlatWndProc.cpp

@@ -29,6 +29,8 @@
  * @author Karl Tauber
  */
 
+HWND getWindowHandle( JNIEnv* env, jobject window );
+
 //---- JNI methods ------------------------------------------------------------
 
 extern "C"
@@ -540,7 +542,7 @@ void FlatWndProc::setMenuItemState( HMENU systemMenu, int item, bool enabled ) {
 	::SetMenuItemInfo( systemMenu, item, FALSE, &mii );
 }
 
-HWND FlatWndProc::getWindowHandle( JNIEnv* env, jobject window ) {
+HWND getWindowHandle( JNIEnv* env, jobject window ) {
 	JAWT awt;
 	awt.version = JAWT_VERSION_1_4;
 	if( !JAWT_GetAWT( env, &awt ) )

flatlaf-natives/flatlaf-natives-windows/src/main/cpp/FlatWndProc.h

@@ -67,6 +67,4 @@ private:
 	void sendMessageToClientArea( HWND hwnd, int uMsg, LPARAM lParam );
 	void openSystemMenu( HWND hwnd, int x, int y );
 	void setMenuItemState( HMENU systemMenu, int item, bool enabled );
-
-	static HWND getWindowHandle( JNIEnv* env, jobject window );
 };

flatlaf-natives/flatlaf-natives-windows/src/main/cpp/WinWrapper.cpp

@@ -0,0 +1,102 @@
+/*
+ * Copyright 2022 FormDev Software GmbH
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+// avoid inlining of printf()
+#define _NO_CRT_STDIO_INLINE
+
+#include <windows.h>
+#include <dwmapi.h>
+#include "com_formdev_flatlaf_ui_FlatNativeWindowsLibrary.h"
+
+/**
+ * @author Karl Tauber
+ */
+
+// see FlatWndProc.cpp
+HWND getWindowHandle( JNIEnv* env, jobject window );
+
+//---- Utility ----------------------------------------------------------------
+
+extern "C"
+JNIEXPORT jlong JNICALL Java_com_formdev_flatlaf_ui_FlatNativeWindowsLibrary_getOSBuildNumberImpl
+	( JNIEnv* env, jclass cls )
+{
+	OSVERSIONINFO info;
+	info.dwOSVersionInfoSize = sizeof( info );
+	if( !::GetVersionEx( &info ) )
+		return 0;
+	return info.dwBuildNumber;
+}
+
+extern "C"
+JNIEXPORT jlong JNICALL Java_com_formdev_flatlaf_ui_FlatNativeWindowsLibrary_getHWND
+	( JNIEnv* env, jclass cls, jobject window )
+{
+	return reinterpret_cast<jlong>( getWindowHandle( env, window ) );
+}
+
+//---- Desktop Window Manager (DWM) -------------------------------------------
+
+// define constants that may not available in older development environments
+
+#ifndef DWMWA_COLOR_DEFAULT
+
+#define DWMWA_WINDOW_CORNER_PREFERENCE		33
+#define DWMWA_BORDER_COLOR					34
+
+typedef enum  {
+  DWMWCP_DEFAULT = 0,
+  DWMWCP_DONOTROUND = 1,
+  DWMWCP_ROUND = 2,
+  DWMWCP_ROUNDSMALL = 3
+} DWM_WINDOW_CORNER_PREFERENCE;
+
+// Use this constant to reset any window part colors to the system default behavior
+#define DWMWA_COLOR_DEFAULT 0xFFFFFFFF
+
+// Use this constant to specify that a window part should not be rendered
+#define DWMWA_COLOR_NONE    0xFFFFFFFE
+
+#endif
+
+
+extern "C"
+JNIEXPORT jboolean JNICALL Java_com_formdev_flatlaf_ui_FlatNativeWindowsLibrary_setWindowCornerPreference
+	( JNIEnv* env, jclass cls, jlong hwnd, jint cornerPreference )
+{
+	if( hwnd == 0 )
+		return FALSE;
+
+	DWM_WINDOW_CORNER_PREFERENCE attr = (DWM_WINDOW_CORNER_PREFERENCE) cornerPreference;
+	return ::DwmSetWindowAttribute( reinterpret_cast<HWND>( hwnd ), DWMWA_WINDOW_CORNER_PREFERENCE, &attr, sizeof( attr ) ) == S_OK;
+}
+
+extern "C"
+JNIEXPORT jboolean JNICALL Java_com_formdev_flatlaf_ui_FlatNativeWindowsLibrary_setWindowBorderColor
+	( JNIEnv* env, jclass cls, jlong hwnd, jint red, jint green, jint blue )
+{
+	if( hwnd == 0 )
+		return FALSE;
+
+	COLORREF attr;
+	if( red == -1 ) 
+		attr = DWMWA_COLOR_DEFAULT;
+	else if( red == -2 )
+		attr = DWMWA_COLOR_NONE;
+	else
+		attr = RGB( red, green, blue );
+	return ::DwmSetWindowAttribute( reinterpret_cast<HWND>( hwnd ), DWMWA_BORDER_COLOR, &attr, sizeof( attr ) ) == S_OK;
+}