JPopupMenu: Add client property to control the maximum size of a popup menu,

core/src/main/java/com/github/weisj/darklaf/components/ScrollPopupMenu.java

@@ -119,7 +119,7 @@ public class ScrollPopupMenu extends JPopupMenu {
     }
 
     private Popup createPopup() {
-        return popupMenuContainer.createPopup(this, posX, posY, maxHeight);
+        return popupMenuContainer.createPopup(this, posX, posY, -1, maxHeight);
     }
 
     @Override

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

@@ -33,6 +33,7 @@ import javax.swing.plaf.basic.BasicPopupMenuUI;
 import com.github.weisj.darklaf.components.ScrollPopupMenu;
 import com.github.weisj.darklaf.ui.DarkPopupFactory;
 import com.github.weisj.darklaf.util.DarkUIUtil;
+import com.github.weisj.darklaf.util.PropertyUtil;
 
 /**
  * This implementation for PopupMenuUI is almost identical to the one of BasicPopupMenuUI. The key
@@ -48,6 +49,7 @@ public class DarkPopupMenuUI extends BasicPopupMenuUI {
     public static final String KEY_DO_NOT_CANCEL_ON_SCROLL = "doNotCancelOnScroll";
     public static final String HIDE_POPUP_VALUE = "doNotCancelPopup";
     public static final String KEY_DEFAULT_LIGHTWEIGHT_POPUPS = "PopupMenu.defaultLightWeightPopups";
+    public static final String KEY_MAX_POPUP_SIZE = "maxPopupSize";
     private PopupMenuContainer popupMenuContainer;
 
     public static ComponentUI createUI(final JComponent x) {
@@ -103,7 +105,18 @@ public class DarkPopupMenuUI extends BasicPopupMenuUI {
     public Popup getPopup(final JPopupMenu popup, final int x, final int y) {
         PopupMenuContainer container = getPopupMenuContainer();
         if (container == null) return super.getPopup(popup, x, y);
-        int maxHeight = DarkUIUtil.getScreenBounds(popup, x, y, false).height;
-        return container.createPopup(popup, x, y, maxHeight);
+        Dimension maxSize = PropertyUtil.getObject(popup, KEY_MAX_POPUP_SIZE, Dimension.class);
+        int maxHeight = -1;
+        int maxWidth = -1;
+        if (maxSize != null) {
+            maxHeight = maxSize.height;
+            maxWidth = maxSize.width;
+        }
+        if (maxHeight <= 0 || maxWidth <= 0) {
+            Rectangle screenSize = DarkUIUtil.getScreenBounds(popup, x, y, false);
+            if (maxHeight <= 0) maxHeight = screenSize.height;
+            if (maxWidth <= 0) maxWidth = screenSize.width;
+        }
+        return container.createPopup(popup, x, y, maxWidth, maxHeight);
     }
 }

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

@@ -125,10 +125,13 @@ public class PopupMenuContainer extends JPanel {
         }
     }
 
-    public Popup createPopup(final JPopupMenu popupMenu, final int posX, final int posY, final int maxHeight) {
+    public Popup createPopup(final JPopupMenu popupMenu, final int posX, final int posY,
+            final int maxWidth, final int maxHeight) {
         final Dimension prefSize = popupMenu.getPreferredSize();
         uninstallListeners();
-        if (maxHeight <= 0 || prefSize.height <= maxHeight) {
+        boolean exceedsHorizontalSize = (maxHeight > 0 && prefSize.height > maxHeight);
+        boolean exceedsVerticalSize = (maxWidth > 0 && prefSize.width > maxWidth);
+        if (!exceedsHorizontalSize && !exceedsVerticalSize) {
             setBounds(0, 0, prefSize.width, prefSize.height);
             popupMenu.setBorderPainted(true);
             return PopupFactory.getSharedInstance().getPopup(popupMenu.getInvoker(), popupMenu, posX, posY);
@@ -139,14 +142,24 @@ public class PopupMenuContainer extends JPanel {
             if (popupMenu.getComponentCount() > 0) {
                 increment = Math.max(1, popupMenu.getComponent(0).getPreferredSize().height / 2);
             }
-            JScrollBar bar = scrollPane.getVerticalScrollBar();
-            bar.setValue(bar.getMinimum());
-            bar.setUnitIncrement(increment);
+            JScrollBar verticalBar = scrollPane.getVerticalScrollBar();
+            verticalBar.setValue(verticalBar.getMinimum());
+            verticalBar.setUnitIncrement(increment);
+
+            JScrollBar horizontalBar = scrollPane.getHorizontalScrollBar();
+            horizontalBar.setValue(horizontalBar.getMinimum());
+            horizontalBar.setUnitIncrement(increment);
+
             view.removeAll();
             view.add(popupMenu, BorderLayout.CENTER);
             setBorder(popupMenu.getBorder());
             popupMenu.setBorderPainted(false);
-            setPreferredSize(new Dimension(prefSize.width + bar.getPreferredSize().width, maxHeight));
+            Dimension constraintSize = new Dimension(prefSize);
+            if (exceedsHorizontalSize) constraintSize.width += verticalBar.getPreferredSize().width;
+            if (exceedsVerticalSize) constraintSize.height += horizontalBar.getPreferredSize().height;
+            if (maxWidth > 0) constraintSize.width = Math.min(constraintSize.width, maxWidth);
+            if (maxHeight > 0) constraintSize.height = Math.min(constraintSize.height, maxHeight);
+            setPreferredSize(constraintSize);
             return PopupFactory.getSharedInstance().getPopup(popupMenu.getInvoker(), this, posX, posY);
         }
     }