Expose bounds of title bar buttons

This is especially useful on macOS with fullSizeContentView enabled
to ensure components in the title bar area don't get obscured by the
buttons.

macos/src/main/java/com/github/weisj/darklaf/platform/macos/JNIDecorationsMacOS.java

@@ -1,7 +1,7 @@
 /*
  * MIT License
  *
- * Copyright (c) 2019-2021 Jannis Weis
+ * Copyright (c) 2019-2022 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,
@@ -44,4 +44,6 @@ public final class JNIDecorationsMacOS {
     public static native boolean isFullscreen(final long hwnd);
 
     public static native double getTitleFontSize(final long hwnd);
+
+    public static native float[] windowButtonRect(final long hwnd);
 }

macos/src/main/java/com/github/weisj/darklaf/platform/macos/MacOSDecorationsProvider.java

@@ -26,10 +26,7 @@ import java.util.List;
 
 import javax.swing.*;
 
-import com.github.weisj.darklaf.platform.CustomTitlePane;
-import com.github.weisj.darklaf.platform.DecorationsProvider;
-import com.github.weisj.darklaf.platform.SystemInfo;
-import com.github.weisj.darklaf.platform.UnsupportedProviderException;
+import com.github.weisj.darklaf.platform.*;
 import com.github.weisj.darklaf.platform.macos.ui.MacOSTitlePane;
 
 public class MacOSDecorationsProvider implements DecorationsProvider {
@@ -65,4 +62,13 @@ public class MacOSDecorationsProvider implements DecorationsProvider {
     public boolean supportsNativeTitleLabel() {
         return SystemInfo.isMacOSMojave;
     }
+
+    @Override
+    public TitlePaneLayoutInfo titlePaneLayoutInfo(final CustomTitlePane customTitlePane) {
+        if (!(customTitlePane instanceof MacOSTitlePane)) throw new IllegalStateException();
+        long hwnd = ((MacOSTitlePane) customTitlePane).windowHandle();
+        if (hwnd == 0) return new TitlePaneLayoutInfo(new Rectangle(0, 0, -1, -1));
+        float[] b = JNIDecorationsMacOS.windowButtonRect(((MacOSTitlePane) customTitlePane).windowHandle());
+        return new TitlePaneLayoutInfo(new Rectangle((int) b[0], (int) b[1], (int) b[2], (int) b[3]));
+    }
 }

macos/src/main/java/com/github/weisj/darklaf/platform/macos/ui/MacOSTitlePane.java

@@ -198,6 +198,10 @@ public class MacOSTitlePane extends CustomTitlePane {
         return new RootPanePropertyChangeListener();
     }
 
+    public long windowHandle() {
+        return decorationInformation.windowHandle;
+    }
+
     protected class RootPanePropertyChangeListener implements PropertyChangeListener {
 
         @Override

macos/src/main/objcpp/Decorations.mm

@@ -155,3 +155,29 @@ JNF_COCOA_ENTER(env);
     }];
 JNF_COCOA_EXIT(env);
 }
+
+NSRect join(NSRect r, NSButton* button) {
+    NSRect buttonRect = [button convertRect: [button bounds] toView: nil];
+    return NSUnionRect(r, buttonRect);
+}
+
+JNIEXPORT jfloatArray JNICALL
+Java_com_github_weisj_darklaf_platform_macos_JNIDecorationsMacOS_windowButtonRect(JNIEnv *env, jclass, jlong hwnd) {
+JNF_COCOA_ENTER(env);
+    NSWindow *nsWindow = OBJC(hwnd);
+    NSButton *closeButton = [nsWindow standardWindowButton: NSWindowCloseButton];
+    NSButton *minimizeButton = [nsWindow standardWindowButton: NSWindowMiniaturizeButton];
+    NSButton *zoomButton = [nsWindow standardWindowButton: NSWindowZoomButton];
+
+    NSRect rect = NSMakeRect(0,0, -1, -1);
+    if (closeButton) rect = join(rect, closeButton);
+    if (minimizeButton) rect = join(rect, minimizeButton);
+    if (zoomButton) rect = join(rect, zoomButton);
+
+    jfloatArray bounds = env->NewFloatArray(4);
+    jfloat rawBounds[4] = {rect.origin.x, rect.origin.y, rect.size.width, rect.size.height};
+    env->SetFloatArrayRegion(bounds, 0, 0, rawBounds);
+
+    return bounds;
+JNF_COCOA_EXIT(env);
+}

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

@@ -77,4 +77,12 @@ public interface DecorationsProvider {
     default boolean supportsNativeTitleLabel() {
         return false;
     }
+
+    /**
+     * Compute the layout information for the title pane.
+     *
+     * @param customTitlePane the given title pane
+     * @return information about the layout of the title pane
+     */
+    TitlePaneLayoutInfo titlePaneLayoutInfo(final CustomTitlePane customTitlePane);
 }

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

@@ -0,0 +1,35 @@
+/*
+ * MIT License
+ *
+ * Copyright (c) 2022 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.platform;
+
+import java.awt.*;
+
+public class TitlePaneLayoutInfo {
+    private final Rectangle windowButtonRect;
+
+    public TitlePaneLayoutInfo(final Rectangle windowButtonRect) {
+        this.windowButtonRect = windowButtonRect;
+    }
+
+    public Rectangle windowButtonRect() {
+        return windowButtonRect;
+    }
+}

platform-decorations/src/main/java/com/github/weisj/darklaf/platform/decorations/DefaultDecorationsProvider.java

@@ -28,6 +28,7 @@ import javax.swing.*;
 
 import com.github.weisj.darklaf.platform.CustomTitlePane;
 import com.github.weisj.darklaf.platform.DecorationsProvider;
+import com.github.weisj.darklaf.platform.TitlePaneLayoutInfo;
 
 class DefaultDecorationsProvider implements DecorationsProvider {
 
@@ -59,4 +60,8 @@ class DefaultDecorationsProvider implements DecorationsProvider {
         return Collections.emptyList();
     }
 
+    @Override
+    public TitlePaneLayoutInfo titlePaneLayoutInfo(final CustomTitlePane customTitlePane) {
+        return new TitlePaneLayoutInfo(new Rectangle());
+    }
 }

platform-decorations/src/main/java/com/github/weisj/darklaf/platform/decorations/NativeDecorationsManager.java

@@ -24,10 +24,12 @@ import java.awt.*;
 import java.util.Properties;
 
 import javax.swing.*;
+import javax.swing.plaf.RootPaneUI;
 
 import com.github.weisj.darklaf.platform.CustomTitlePane;
 import com.github.weisj.darklaf.platform.DecorationsProvider;
 import com.github.weisj.darklaf.platform.SystemInfo;
+import com.github.weisj.darklaf.platform.TitlePaneLayoutInfo;
 import com.github.weisj.darklaf.platform.macos.MacOSDecorationsProvider;
 import com.github.weisj.darklaf.platform.windows.WindowsDecorationsProvider;
 import com.github.weisj.darklaf.properties.PropertyLoader;
@@ -114,4 +116,10 @@ public class NativeDecorationsManager {
     public boolean supportsNativeTitleText() {
         return decorationsProvider.supportsNativeTitleLabel();
     }
+
+    public TitlePaneLayoutInfo titlePaneLayoutInfo(final RootPaneContainer frameOrDialog) {
+        RootPaneUI ui = frameOrDialog.getRootPane().getUI();
+        if (!(ui instanceof AbstractNativeDecorationsRootPaneUI)) throw new IllegalStateException();
+        return decorationsProvider.titlePaneLayoutInfo(((AbstractNativeDecorationsRootPaneUI) ui).titlePane());
+    }
 }

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

@@ -27,10 +27,7 @@ import java.util.List;
 import javax.swing.*;
 import javax.swing.border.Border;
 
-import com.github.weisj.darklaf.platform.CustomTitlePane;
-import com.github.weisj.darklaf.platform.DecorationsProvider;
-import com.github.weisj.darklaf.platform.SystemInfo;
-import com.github.weisj.darklaf.platform.UnsupportedProviderException;
+import com.github.weisj.darklaf.platform.*;
 import com.github.weisj.darklaf.platform.windows.ui.WindowsTitlePane;
 
 public class WindowsDecorationsProvider implements DecorationsProvider {
@@ -96,6 +93,13 @@ public class WindowsDecorationsProvider implements DecorationsProvider {
         }
     }
 
+    @Override
+    public TitlePaneLayoutInfo titlePaneLayoutInfo(final CustomTitlePane customTitlePane) {
+        if (!(customTitlePane instanceof WindowsTitlePane)) throw new IllegalStateException();
+        WindowsTitlePane titlePane = (WindowsTitlePane) customTitlePane;
+        return new TitlePaneLayoutInfo(titlePane.windowButtonRect());
+    }
+
     @Override
     public List<String> getPropertyResourcePaths() {
         ArrayList<String> properties = new ArrayList<>();

windows/src/main/java/com/github/weisj/darklaf/platform/windows/ui/WindowsTitlePane.java

@@ -26,6 +26,7 @@ import java.awt.image.BufferedImage;
 import java.beans.PropertyChangeEvent;
 import java.beans.PropertyChangeListener;
 import java.util.List;
+import java.util.function.Consumer;
 import java.util.logging.Logger;
 
 import javax.accessibility.AccessibleContext;
@@ -689,6 +690,20 @@ public class WindowsTitlePane extends CustomTitlePane {
         }
     }
 
+    public Rectangle windowButtonRect() {
+        Rectangle rect = new Rectangle(0, 0, -1, -1);
+        if (hideTitleBar()) return rect;
+        Consumer<JComponent> joinRect = c -> {
+            if (c != null && c.isVisible()) {
+                rect.setBounds(rect.union(c.getBounds()));
+            }
+        };
+        joinRect.accept(closeButton);
+        joinRect.accept(maximizeToggleButton);
+        joinRect.accept(minimizeButton);
+        return rect;
+    }
+
     private abstract class TitlePaneAction extends AbstractAction {
         private TitlePaneAction(Icon icon, String... resourceNames) {
             super("", icon);