FileChooser: make top-right buttons look like toolbar buttons

flatlaf-core/src/main/java/com/formdev/flatlaf/FlatClientProperties.java

@@ -31,7 +31,7 @@ public interface FlatClientProperties
 	 * <strong>Components</strong> {@link javax.swing.JButton} and {@link javax.swing.JToggleButton}<br>
 	 * <strong>Value type</strong> {@link java.lang.String}<br>
 	 * <strong>Allowed Values</strong> {@link #BUTTON_TYPE_SQUARE}, {@link #BUTTON_TYPE_ROUND_RECT},
-	 * {@link #BUTTON_TYPE_TAB} and {@link #BUTTON_TYPE_HELP}
+	 * {@link #BUTTON_TYPE_TAB}, {@link #BUTTON_TYPE_HELP} and {@link BUTTON_TYPE_TOOLBAR_BUTTON}
 	 */
 	String BUTTON_TYPE = "JButton.buttonType";
 
@@ -71,6 +71,15 @@ public interface FlatClientProperties
 	 */
 	String BUTTON_TYPE_HELP = "help";
 
+	/**
+	 * Paint the button in toolbar style.
+	 * <p>
+	 * <strong>Components</strong> {@link javax.swing.JButton} and {@link javax.swing.JToggleButton}
+	 *
+	 * @see #BUTTON_TYPE
+	 */
+	String BUTTON_TYPE_TOOLBAR_BUTTON = "toolBarButton";
+
 	/**
 	 * Specifies selected state of a checkbox.
 	 * <p>

flatlaf-core/src/main/java/com/formdev/flatlaf/ui/FlatButtonUI.java

@@ -249,7 +249,8 @@ public class FlatButtonUI
 	}
 
 	static boolean isToolBarButton( Component c ) {
-		return c.getParent() instanceof JToolBar;
+		return c.getParent() instanceof JToolBar ||
+			(c instanceof AbstractButton && clientPropertyEquals( (AbstractButton) c, BUTTON_TYPE, BUTTON_TYPE_TOOLBAR_BUTTON ));
 	}
 
 	@Override

flatlaf-core/src/main/java/com/formdev/flatlaf/ui/FlatFileChooserUI.java

@@ -16,15 +16,26 @@
 
 package com.formdev.flatlaf.ui;
 
+import java.awt.BorderLayout;
+import java.awt.Component;
 import java.awt.Dimension;
+import java.awt.Insets;
 import java.io.File;
+import javax.swing.AbstractButton;
+import javax.swing.Box;
+import javax.swing.BoxLayout;
 import javax.swing.Icon;
 import javax.swing.ImageIcon;
+import javax.swing.JButton;
 import javax.swing.JComponent;
 import javax.swing.JFileChooser;
+import javax.swing.JPanel;
+import javax.swing.JToggleButton;
+import javax.swing.UIManager;
 import javax.swing.filechooser.FileView;
 import javax.swing.plaf.ComponentUI;
 import javax.swing.plaf.metal.MetalFileChooserUI;
+import com.formdev.flatlaf.FlatClientProperties;
 import com.formdev.flatlaf.util.ScaledImageIcon;
 import com.formdev.flatlaf.util.UIScale;
 
@@ -132,6 +143,40 @@ public class FlatFileChooserUI
 		super( filechooser );
 	}
 
+	@Override
+	public void installComponents( JFileChooser fc ) {
+		super.installComponents( fc );
+
+		patchUI( fc );
+	}
+
+	private void patchUI( JFileChooser fc ) {
+		// turn top-right buttons into toolbar buttons
+		Component topPanel = fc.getComponent( 0 );
+		if( (topPanel instanceof JPanel) &&
+			(((JPanel)topPanel).getLayout() instanceof BorderLayout) )
+		{
+			Component topButtonPanel = ((JPanel)topPanel).getComponent( 0 );
+			if( (topButtonPanel instanceof JPanel) &&
+				(((JPanel)topButtonPanel).getLayout() instanceof BoxLayout) )
+			{
+				Insets margin = UIManager.getInsets( "Button.margin" );
+				Component[] comps = ((JPanel)topButtonPanel).getComponents();
+				for( int i = comps.length - 1; i >= 0; i-- ) {
+					Component c = comps[i];
+					if( c instanceof JButton || c instanceof JToggleButton ) {
+						AbstractButton b = (AbstractButton)c;
+						b.putClientProperty( FlatClientProperties.BUTTON_TYPE,
+							FlatClientProperties.BUTTON_TYPE_TOOLBAR_BUTTON );
+						b.setMargin( margin );
+						b.setFocusable( false );
+					} else if( c instanceof Box.Filler )
+						((JPanel)topButtonPanel).remove( i );
+				}
+			}
+		}
+	}
+
 	@Override
 	public Dimension getPreferredSize( JComponent c ) {
 		return UIScale.scale( super.getPreferredSize( c ) );