Windows: Allow changing the window border radius for popups

platform-base/src/main/java/com/github/weisj/darklaf/platform/DecorationsConstants.java

@@ -1,7 +1,7 @@
 /*
  * MIT License
  *
- * Copyright (c) 2022 Jannis Weis
+ * Copyright (c) 2022-2023 Jannis Weis
  *
  * Permission is hereby granted, free of charge, to any person obtaining a copy of this software and
  * associated documentation files (the "Software"), to deal in the Software without restriction,
@@ -28,4 +28,5 @@ public interface DecorationsConstants {
     String KEY_UNIFIED_MENUBAR = "JRootPane.unifiedMenuBar";
     String KEY_COLORED_TITLE_BAR = "JRootPane.coloredTitleBar";
     String KEY_HIDE_TITLE = "JRootPane.hideTitle";
+    String KEY_WINDOWS_SMALL_CORNER_RADIUS = "JRootPane.windows.smallCornerRadius";
 }

windows/src/main/cpp/Decorations.cpp

@@ -1,7 +1,7 @@
 /*
  * MIT License
  *
- * Copyright (c) 2019-2022 Jannis Weis
+ * Copyright (c) 2019-2023 Jannis Weis
  *
  * Permission is hereby granted, free of charge, to any person obtaining a copy of this software and
  * associated documentation files (the "Software"), to deal in the Software without restriction,
@@ -316,14 +316,14 @@ static void SetupWindowStyle(HWND handle) {
     SetWindowLongPtr(handle, GWL_STYLE, style);
 }
 
-static bool InstallDecorations(HWND handle, bool is_popup) {
+static bool InstallDecorations(HWND handle, bool is_popup, bool use_small_corner_arc = false) {
     // Prevent multiple installations overriding the real window procedure.
     auto it = wrapper_map.find(handle);
     if (it != wrapper_map.end()) return false;
 
     SetupWindowStyle(handle);
     ExtendClientFrame(handle);
-    if (is_popup) {
+    if (use_small_corner_arc) {
         auto attribute = DWMWINDOWATTRIBUTE::DWMWA_WINDOW_CORNER_PREFERENCE;
         auto preference = DWM_WINDOW_CORNER_PREFERENCE::DWMWCP_ROUNDSMALL;
         DwmSetWindowAttribute(handle, attribute, &preference, sizeof(preference));
@@ -509,9 +509,9 @@ Java_com_github_weisj_darklaf_platform_windows_JNIDecorationsWindows_uninstallDe
 }
 
 JNIEXPORT jboolean JNICALL
-Java_com_github_weisj_darklaf_platform_windows_JNIDecorationsWindows_installPopupMenuDecorations(JNIEnv*, jclass, jlong hwnd) {
+Java_com_github_weisj_darklaf_platform_windows_JNIDecorationsWindows_installPopupMenuDecorations(JNIEnv*, jclass, jlong hwnd, jboolean useSmallCornerArc) {
     HWND handle = reinterpret_cast<HWND>(hwnd);
-    return static_cast<jboolean>(InstallDecorations(handle, true));
+    return static_cast<jboolean>(InstallDecorations(handle, true, useSmallCornerArc));
 }
 
 //Window functions.

windows/src/main/java/com/github/weisj/darklaf/platform/windows/JNIDecorationsWindows.java

@@ -1,7 +1,7 @@
 /*
  * MIT License
  *
- * Copyright (c) 2019-2021 Jannis Weis
+ * Copyright (c) 2019-2023 Jannis Weis
  *
  * Permission is hereby granted, free of charge, to any person obtaining a copy of this software and
  * associated documentation files (the "Software"), to deal in the Software without restriction,
@@ -48,7 +48,7 @@ public final class JNIDecorationsWindows {
 
     public static native void uninstallDecorations(final long hwnd, final boolean decorated);
 
-    public static native boolean installPopupMenuDecorations(final long hwnd);
+    public static native boolean installPopupMenuDecorations(final long hwnd, final boolean useSmallCornerArc);
 
     public static native void init();
 

windows/src/main/java/com/github/weisj/darklaf/platform/windows/WindowsDecorationsProvider.java

@@ -1,7 +1,7 @@
 /*
  * MIT License
  *
- * Copyright (c) 2019-2022 Jannis Weis
+ * Copyright (c) 2019-2023 Jannis Weis
  *
  * Permission is hereby granted, free of charge, to any person obtaining a copy of this software and
  * associated documentation files (the "Software"), to deal in the Software without restriction,
@@ -29,6 +29,7 @@ import javax.swing.border.Border;
 
 import com.github.weisj.darklaf.platform.*;
 import com.github.weisj.darklaf.platform.windows.ui.WindowsTitlePane;
+import com.github.weisj.darklaf.util.PropertyUtil;
 
 public class WindowsDecorationsProvider implements DecorationsProvider {
 
@@ -61,7 +62,9 @@ public class WindowsDecorationsProvider implements DecorationsProvider {
         }
         PointerUtil.WindowPointer hwnd = PointerUtil.getHWND(window);
         if (hwnd.isValid()) {
-            JNIDecorationsWindows.installPopupMenuDecorations(hwnd.value());
+
+            JNIDecorationsWindows.installPopupMenuDecorations(hwnd.value(),
+                    useSmallCornerRadiusForWindow(window));
             if (window instanceof RootPaneContainer) {
                 JRootPane rootPane = ((RootPaneContainer) window).getRootPane();
                 Color bg = rootPane != null ? rootPane.getBackground() : null;
@@ -72,6 +75,12 @@ public class WindowsDecorationsProvider implements DecorationsProvider {
         }
     }
 
+    private boolean useSmallCornerRadiusForWindow(final Window w) {
+        if (!(w instanceof RootPaneContainer)) return false;
+        return PropertyUtil.getBooleanProperty(((RootPaneContainer) w).getRootPane(),
+                DecorationsConstants.KEY_WINDOWS_SMALL_CORNER_RADIUS, true);
+    }
+
     @Override
     public void uninstallPopupWindow(final Window window) {
         if (window.isDisplayable()) {