Made PopupMenus heavyweight by default.

Added shadows to popupmenus on windows.
Added demo for PopupMenu.
Removed duplicate line in jni-library.gradle.kts

buildSrc/src/main/kotlin/jni-library.gradle.kts

@@ -104,7 +104,6 @@ afterEvaluate {
                                 binary.linkTask.get().debuggable.set(false)
                                 //Build and copy library
                                 dependsOn(binary.linkTask)
-                                val variantName = binary.targetMachine.variantName
                                 into("$libraryPath/$variantName") {
                                     from(binary.runtimeFile)
                                 }

core/src/main/java/com/github/weisj/darklaf/DarkLaf.java

@@ -119,7 +119,12 @@ public class DarkLaf extends BasicLookAndFeel implements PropertyChangeListener
                 patchMacOSFonts(defaults);
             }
             setupDecorations();
-
+            String key = DarkPopupMenuUI.KEY_DEFAULT_LIGHTWEIGHT_POPUPS;
+            if (SystemInfo.isWindows10 && Decorations.isCustomDecorationSupported()) {
+                JPopupMenu.setDefaultLightWeightPopupEnabled(defaults.getBoolean(key + ".windows"));
+            } else {
+                JPopupMenu.setDefaultLightWeightPopupEnabled(defaults.getBoolean(key));
+            }
             return defaults;
         } catch (final Exception e) {
             LOGGER.log(Level.SEVERE, e.toString(), e.getStackTrace());
@@ -349,7 +354,23 @@ public class DarkLaf extends BasicLookAndFeel implements PropertyChangeListener
          * This is disadvantageous for the behaviour of custom tooltips.
          */
         call("initialize");
-        PopupFactory.setSharedInstance(new PopupFactory());
+        PopupFactory.setSharedInstance(new PopupFactory() {
+            @Override
+            public Popup getPopup(final Component owner, final Component contents,
+                                  final int x, final int y) throws IllegalArgumentException {
+                Popup popup = super.getPopup(owner, contents, x, y);
+                // Sometimes the background is java.awt.SystemColor[i=7]
+                // It results in a flash of white background that is repainted with
+                // the proper popup background later.
+                // That is why we set window background explicitly.
+                Window window = SwingUtilities.getWindowAncestor(contents);
+                if (window != null) {
+                    window.setBackground(UIManager.getColor("PopupMenu.translucentBackground"));
+                    Decorations.initPopupWindow(window);
+                }
+                return popup;
+            }
+        });
         PropertyLoader.reset();
         UIManager.addPropertyChangeListener(this);
     }

core/src/main/java/com/github/weisj/darklaf/decorators/MouseDelegate.java

@@ -0,0 +1,74 @@
+/*
+ * MIT License
+ *
+ * Copyright (c) 2020 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, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+package com.github.weisj.darklaf.decorators;
+
+import java.awt.event.MouseAdapter;
+import java.awt.event.MouseEvent;
+import java.awt.event.MouseListener;
+
+public class MouseDelegate implements MouseListener {
+
+    protected MouseListener delegate;
+
+    public MouseDelegate(final MouseListener delegate) {
+        setDelegate(delegate);
+    }
+
+    public MouseListener getDelegate() {
+        return delegate;
+    }
+
+    public void setDelegate(final MouseListener delegate) {
+        this.delegate = delegate;
+        if (delegate == null) {
+            this.delegate = new MouseAdapter() {
+            };
+        }
+    }
+
+    @Override
+    public void mouseClicked(final MouseEvent e) {
+        delegate.mouseClicked(e);
+    }
+
+    @Override
+    public void mousePressed(final MouseEvent e) {
+        delegate.mousePressed(e);
+    }
+
+    @Override
+    public void mouseReleased(final MouseEvent e) {
+        delegate.mousePressed(e);
+    }
+
+    @Override
+    public void mouseEntered(final MouseEvent e) {
+        delegate.mouseEntered(e);
+    }
+
+    @Override
+    public void mouseExited(final MouseEvent e) {
+        delegate.mouseExited(e);
+    }
+}

core/src/main/java/com/github/weisj/darklaf/platform/Decorations.java

@@ -33,6 +33,7 @@ import com.github.weisj.darklaf.util.PropertyValue;
 import com.github.weisj.darklaf.util.SystemInfo;
 
 import javax.swing.*;
+import java.awt.*;
 import java.util.Properties;
 
 public final class Decorations {
@@ -63,6 +64,10 @@ public final class Decorations {
         return decorationsProvider.createTitlePane(rootPane, decorationStyle);
     }
 
+    public static void initPopupWindow(final Window window) {
+        decorationsProvider.initPopupWindow(window);
+    }
+
 
     public static boolean isCustomDecorationSupported() {
         return decorationsProvider.isCustomDecorationSupported()

core/src/main/java/com/github/weisj/darklaf/ui/menu/DarkMenuUI.java

@@ -23,6 +23,7 @@
  */
 package com.github.weisj.darklaf.ui.menu;
 
+import com.github.weisj.darklaf.decorators.MouseDelegate;
 import com.github.weisj.darklaf.util.DarkUIUtil;
 import com.github.weisj.darklaf.util.GraphicsContext;
 import com.github.weisj.darklaf.util.GraphicsUtil;
@@ -34,15 +35,56 @@ import javax.swing.*;
 import javax.swing.plaf.ComponentUI;
 import javax.swing.plaf.basic.BasicMenuUI;
 import java.awt.*;
+import java.awt.event.MouseEvent;
+import java.awt.event.MouseListener;
 
 public class DarkMenuUI extends BasicMenuUI {
 
     protected Icon arrowIconHover;
+    protected JMenu menu;
+    protected MouseListener mouseListener;
 
     public static ComponentUI createUI(final JComponent x) {
         return new DarkMenuUI();
     }
 
+    @Override
+    public void installUI(final JComponent c) {
+        menu = (JMenu) c;
+        super.installUI(c);
+    }
+
+    @Override
+    protected void installListeners() {
+        super.installListeners();
+        for (MouseListener listener : menu.getMouseListeners()) {
+            if (listener.getClass().getEnclosingClass().equals(BasicMenuUI.class)) {
+                menu.removeMouseListener(listener);
+                mouseListener = new MouseDelegate(listener) {
+                    @Override
+                    public void mouseEntered(final MouseEvent e) {
+                        MenuSelectionManager manager = MenuSelectionManager.defaultManager();
+                        MenuElement[] selectedPath = manager.getSelectedPath();
+                        for (MenuElement element : selectedPath) {
+                            if (element.equals(menu)) {
+                                return;
+                            }
+                        }
+                        super.mouseEntered(e);
+                    }
+                };
+                menu.addMouseListener(mouseListener);
+                break;
+            }
+        }
+    }
+
+    @Override
+    protected void uninstallListeners() {
+        super.uninstallListeners();
+        menu.removeMouseListener(mouseListener);
+    }
+
     @Override
     protected void installDefaults() {
         super.installDefaults();

core/src/main/java/com/github/weisj/darklaf/ui/popupmenu/DarkPopupMenuUI.java

@@ -57,7 +57,7 @@ public class DarkPopupMenuUI extends BasicPopupMenuUI {
         "doNotCancelPopup"));
     public static final StringBuilder MOUSE_GRABBER_KEY = new StringBuilder(
         "javax.swing.plaf.basic.BasicPopupMenuUI.MouseGrabber");
-
+    public static final String KEY_DEFAULT_LIGHTWEIGHT_POPUPS = "PopupMenu.defaultLightWeightPopups";
 
     public static ComponentUI createUI(final JComponent x) {
         return new DarkPopupMenuUI();

core/src/main/resources/com/github/weisj/darklaf/properties/platform/mac.properties

@@ -20,3 +20,4 @@ List.alternateRowColor           = true
 FileChooser.listViewWindowsStyle   = false
 CheckBox.borderInsets              = 2,2,2,2
 RadioButton.borderInsets           = 2,2,2,2
+PopupMenu.defaultLightWeightPopups = false

core/src/main/resources/com/github/weisj/darklaf/properties/platform/windows.properties

@@ -26,3 +26,4 @@ FileChooser.listViewWindowsStyle               = true
 Table.alternateRowColor                    = false
 Tree.alternateRowColor                     = false
 List.alternateRowColor                     = false
+PopupMenu.defaultLightWeightPopups.windows = false

core/src/main/resources/com/github/weisj/darklaf/properties/ui/popupMenu.properties

@@ -26,3 +26,4 @@ PopupMenuUI                     = com.github.weisj.darklaf.ui.popupmenu.DarkPopu
 PopupMenu.border                   = com.github.weisj.darklaf.ui.popupmenu.DarkPopupMenuBorder
 PopupMenu.translucentBackground    = %backgroundContainer
 PopupMenu.borderColor              = %borderSecondary
+PopupMenu.defaultLightWeightPopups = true

core/src/test/java/ui/popupMenu/PopupMenuDemo.java

@@ -0,0 +1,67 @@
+/*
+ * MIT License
+ *
+ * Copyright (c) 2020 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, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+package ui.popupMenu;
+
+import ui.ComponentDemo;
+
+import javax.swing.*;
+import java.awt.*;
+
+public class PopupMenuDemo implements ComponentDemo {
+
+    public static void main(final String[] args) {
+        ComponentDemo.showDemo(new PopupMenuDemo());
+    }
+
+    @Override
+    public JComponent createComponent() {
+        JPanel panel = new JPanel();
+        panel.setLayout(new GridBagLayout());
+        panel.add(new JLabel("Right click anywhere to open menu.") {{
+            setInheritsPopupMenu(true);
+        }});
+        panel.setPreferredSize(new Dimension(200, 200));
+        panel.setComponentPopupMenu(new JPopupMenu() {{
+            for (int i = 0; i < 3; i++) {
+                add(new JMenu("Menu " + i) {{
+                    for (int j = 0; j < 2; j++) {
+                        add(new JMenu("SubMenu " + j) {{
+                            add(new JMenuItem("Item"));
+                        }});
+                        add(new JMenuItem("Item 1"));
+                        add(new JMenuItem("Item 2"));
+                    }
+                    add(new JMenuItem("Item 1"));
+                    add(new JMenuItem("Item 2"));
+                }});
+            }
+        }});
+        return panel;
+    }
+
+    @Override
+    public String getTitle() {
+        return "PopupMenu Demo";
+    }
+}

decorations-base/src/main/java/com/github/weisj/darklaf/decorations/DecorationsProvider.java

@@ -24,6 +24,7 @@
 package com.github.weisj.darklaf.decorations;
 
 import javax.swing.*;
+import java.awt.*;
 import java.util.Properties;
 
 public interface DecorationsProvider {
@@ -57,4 +58,10 @@ public interface DecorationsProvider {
      * @param currentDefaults the current ui defaults.
      */
     void loadDecorationProperties(Properties properties, UIDefaults currentDefaults);
+
+    /**
+     * Initialize the window of a popup menu.
+     */
+    default void initPopupWindow(final Window window) {
+    }
 }

windows/src/main/cpp/JNIDecorations.cpp

@@ -34,6 +34,7 @@ std::map<HWND, WindowWrapper *> wrapper_map = std::map<HWND, WindowWrapper *>();
 
 LRESULT HitTestNCA(HWND hWnd, WPARAM wParam, LPARAM lParam, WindowWrapper *wrapper)
 {
+    if (wrapper->popup_menu) return HTCLIENT;
     // Get the point coordinates for the hit test.
     POINT ptMouse = {GET_X_LPARAM(lParam), GET_Y_LPARAM(lParam)};
 
@@ -75,7 +76,9 @@ LRESULT HitTestNCA(HWND hWnd, WPARAM wParam, LPARAM lParam, WindowWrapper *wrapp
     if (hit == HTNOWHERE || !wrapper->resizable)
     {
         //Handle window drag.
-        if (ptMouse.y < rcWindow.top + wrapper->height && ptMouse.x >= rcWindow.left + wrapper->left && ptMouse.x <= rcWindow.right - wrapper->right)
+        if (ptMouse.y < rcWindow.top + wrapper->height
+            && ptMouse.x >= rcWindow.left + wrapper->left
+            && ptMouse.x <= rcWindow.right - wrapper->right)
         {
             return HTCAPTION;
         }
@@ -165,32 +168,43 @@ Java_com_github_weisj_darklaf_platform_windows_JNIDecorationsWindows_setBackgrou
     }
 }
 
-JNIEXPORT void JNICALL
-Java_com_github_weisj_darklaf_platform_windows_JNIDecorationsWindows_installDecorations(JNIEnv *env, jclass obj, jlong hwnd)
+void extend_client_frame(HWND handle)
 {
-    HWND handle = reinterpret_cast<HWND>(hwnd);
-
-    auto it = wrapper_map.find(handle);
-    if (it != wrapper_map.end())
-    {
-        //Prevent multiple installations overriding the real window procedure.
-        return;
-    }
-
     MARGINS margins = {0, 0, 0, 1};
     DwmExtendFrameIntoClientArea(handle, &margins);
+}
 
+void setup_window_style(HWND handle)
+{
     auto style = GetWindowLongPtr(handle, GWL_STYLE);
     SetWindowLongPtr(handle, GWL_STYLE, style | WS_THICKFRAME);
+}
+
+void install_decorations(HWND handle, bool is_popup)
+{
+    //Prevent multiple installations overriding the real window procedure.
+    auto it = wrapper_map.find(handle);
+    if (it != wrapper_map.end()) return;
+
+    extend_client_frame(handle);
+    setup_window_style(handle);
 
     SetWindowPos(handle, NULL, 0, 0, 0, 0, SWP_NOZORDER | SWP_NOOWNERZORDER | SWP_NOMOVE | SWP_NOSIZE | SWP_FRAMECHANGED);
     WNDPROC proc = reinterpret_cast<WNDPROC>(GetWindowLongPtr(handle, GWL_WNDPROC));
 
     WindowWrapper *wrapper = new WindowWrapper();
     wrapper->prev_proc = proc;
+    wrapper->popup_menu = is_popup;
     wrapper_map[handle] = wrapper;
 
-    SetWindowLongPtr((HWND)hwnd, GWL_WNDPROC, (LONG_PTR)WindowWrapper::WindowProc);
+    SetWindowLongPtr(handle, GWL_WNDPROC, (LONG_PTR)WindowWrapper::WindowProc);
+}
+
+JNIEXPORT void JNICALL
+Java_com_github_weisj_darklaf_platform_windows_JNIDecorationsWindows_installDecorations(JNIEnv *env, jclass obj, jlong hwnd)
+{
+    HWND handle = reinterpret_cast<HWND>(hwnd);
+    install_decorations(handle, false);
 }
 
 JNIEXPORT void JNICALL
@@ -206,6 +220,13 @@ Java_com_github_weisj_darklaf_platform_windows_JNIDecorationsWindows_uninstallDe
     }
 }
 
+JNIEXPORT void JNICALL
+Java_com_github_weisj_darklaf_platform_windows_JNIDecorationsWindows_installPopupMenuDecorations(JNIEnv *env, jclass obj, jlong hwnd)
+{
+    HWND handle = reinterpret_cast<HWND>(hwnd);
+    install_decorations(handle, true);
+}
+
 //Window functions.
 
 JNIEXPORT void JNICALL

windows/src/main/cpp/JNIDecorations.h

@@ -29,6 +29,7 @@ class WindowWrapper
 {
 public:
     bool resizable = true;
+    bool popup_menu = false;
     WNDPROC prev_proc;
     COLORREF background = RGB(255, 255, 255);
 

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

@@ -54,6 +54,8 @@ public class JNIDecorationsWindows {
 
     public static native void uninstallDecorations(final long hwnd);
 
+    public static native void installPopupMenuDecorations(final long hwnd);
+
     /**
      * Load the decorations-library if necessary.
      */

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

@@ -27,9 +27,13 @@ import com.github.weisj.darklaf.PropertyLoader;
 import com.github.weisj.darklaf.decorations.CustomTitlePane;
 import com.github.weisj.darklaf.decorations.DecorationsProvider;
 import com.github.weisj.darklaf.icons.IconLoader;
+import com.github.weisj.darklaf.platform.PointerUtil;
 import com.github.weisj.darklaf.platform.windows.ui.WindowsTitlePane;
 
 import javax.swing.*;
+import java.awt.*;
+import java.awt.event.WindowAdapter;
+import java.awt.event.WindowEvent;
 import java.util.Properties;
 
 public class WindowsDecorationsProvider implements DecorationsProvider {
@@ -49,6 +53,23 @@ public class WindowsDecorationsProvider implements DecorationsProvider {
         JNIDecorationsWindows.updateLibrary();
     }
 
+    @Override
+    public void initPopupWindow(final Window window) {
+        if (!window.isDisplayable()) {
+            window.addNotify();
+        }
+        long hwnd = PointerUtil.getHWND(window);
+        if (hwnd != 0) {
+            JNIDecorationsWindows.installPopupMenuDecorations(hwnd);
+            window.addWindowListener(new WindowAdapter() {
+                @Override
+                public void windowClosing(final WindowEvent e) {
+                    JNIDecorationsWindows.uninstallDecorations(hwnd);
+                }
+            });
+        }
+    }
+
     @Override
     public void loadDecorationProperties(final Properties properties, final UIDefaults currentDefaults) {
         IconLoader iconLoader = IconLoader.get(WindowsDecorationsProvider.class);