Button: default button

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

@@ -51,10 +51,11 @@ public class FlatButtonBorder
 		}
 	}
 
-	public Paint getBorderColor( Component c ) {
+	private Paint getBorderColor( Component c ) {
 		if( c.isEnabled() ) {
-			Color startColor = UIManager.getColor( "Button.startBorderColor" );
-			Color endColor = UIManager.getColor( "Button.endBorderColor" );
+			boolean def = FlatButtonUI.isDefaultButton( c );
+			Color startColor = UIManager.getColor( def ? "Button.default.startBorderColor" : "Button.startBorderColor" );
+			Color endColor = UIManager.getColor( def ? "Button.default.endBorderColor" : "Button.endBorderColor" );
 			return (startColor.equals( endColor ) )
 				? startColor
 				: new GradientPaint( 0, getFocusWidth(), startColor,

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

@@ -16,11 +16,14 @@
 
 package com.formdev.flatlaf.ui;
 
+import java.awt.Color;
+import java.awt.Component;
 import java.awt.FontMetrics;
 import java.awt.Graphics;
 import java.awt.Graphics2D;
 import java.awt.Rectangle;
 import javax.swing.AbstractButton;
+import javax.swing.JButton;
 import javax.swing.JComponent;
 import javax.swing.UIManager;
 import javax.swing.plaf.ComponentUI;
@@ -43,6 +46,10 @@ public class FlatButtonUI
 		return instance;
 	}
 
+	static boolean isDefaultButton( Component c ) {
+		return c instanceof JButton && ((JButton)c).isDefaultButton();
+	}
+
 	@Override
 	public void update( Graphics g, JComponent c ) {
 		if( c.isOpaque() ) {
@@ -57,7 +64,7 @@ public class FlatButtonUI
 					float focusWidth = 2;
 					float arc = 6;
 
-					g2.setColor( c.getBackground() );
+					g2.setColor( getBackground( c ) );
 					FlatUIUtils.fillRoundRectangle( g2, 0, 0, c.getWidth(), c.getHeight(), focusWidth, arc );
 				} finally {
 					g2.dispose();
@@ -71,16 +78,22 @@ public class FlatButtonUI
 	@Override
 	protected void paintText( Graphics g, JComponent c, Rectangle textRect, String text ) {
 		AbstractButton b = (AbstractButton) c;
-		if( b.getModel().isEnabled() )
-			super.paintText( g, c, textRect, text );
-		else {
-			// paint disabled text
-			FontMetrics fm = SwingUtilities2.getFontMetrics( c, g );
-			int mnemonicIndex = b.getDisplayedMnemonicIndex();
-			g.setColor( UIManager.getColor( "Button.disabledText" ) );
-			SwingUtilities2.drawStringUnderlineCharAt( c, g, text, mnemonicIndex,
-				textRect.x + getTextShiftOffset(),
-				textRect.y + fm.getAscent() + getTextShiftOffset() );
-		}
+		FontMetrics fm = SwingUtilities2.getFontMetrics( c, g );
+		int mnemonicIndex = b.getDisplayedMnemonicIndex();
+
+		g.setColor( b.getModel().isEnabled() ? getForeground( c ) : UIManager.getColor( "Button.disabledText" ) );
+		SwingUtilities2.drawStringUnderlineCharAt( c, g, text, mnemonicIndex,
+			textRect.x + getTextShiftOffset(),
+			textRect.y + fm.getAscent() + getTextShiftOffset() );
+	}
+
+	private Color getBackground( Component c ) {
+		boolean def = FlatButtonUI.isDefaultButton( c );
+		return def ? UIManager.getColor( "Button.default.background" ) : c.getBackground();
+	}
+
+	private Color getForeground( Component c ) {
+		boolean def = FlatButtonUI.isDefaultButton( c );
+		return def ? UIManager.getColor( "Button.default.foreground" ) : c.getForeground();
 	}
 }

flatlaf-core/src/main/resources/com/formdev/flatlaf/FlatDarkLaf.properties

@@ -51,6 +51,11 @@ Button.startBorderColor=5e6060
 Button.endBorderColor=5e6060
 Button.disabledBorderColor=5e6060
 
+Button.default.background=365880
+Button.default.foreground=bbbbbb
+Button.default.startBorderColor=4c708c
+Button.default.endBorderColor=4c708c
+
 
 #---- Label ----
 

flatlaf-core/src/main/resources/com/formdev/flatlaf/FlatLightLaf.properties

@@ -51,6 +51,11 @@ Button.startBorderColor=bfbfbf
 Button.endBorderColor=b3b3b3
 Button.disabledBorderColor=cfcfcf
 
+Button.default.background=4A86C7
+Button.default.foreground=f0f0f0
+Button.default.startBorderColor=4779ba
+Button.default.endBorderColor=3167ad
+
 
 #---- Label ----
 

flatlaf-core/src/test/java/com/formdev/flatlaf/FlatComponentsTest.java

@@ -55,12 +55,13 @@ public class FlatComponentsTest
 		JButton button2 = new JButton();
 		JButton button3 = new JButton();
 		JButton button4 = new JButton();
+		FlatComponentsTest.TestDefaultButton button5 = new FlatComponentsTest.TestDefaultButton();
 
 		//======== this ========
 		setLayout(new GridBagLayout());
-		((GridBagLayout)getLayout()).columnWidths = new int[] {0, 0, 0, 0, 0, 0};
+		((GridBagLayout)getLayout()).columnWidths = new int[] {0, 0, 0, 0, 0, 0, 0};
 		((GridBagLayout)getLayout()).rowHeights = new int[] {0, 0, 0};
-		((GridBagLayout)getLayout()).columnWeights = new double[] {0.0, 0.0, 0.0, 0.0, 0.0, 1.0E-4};
+		((GridBagLayout)getLayout()).columnWeights = new double[] {0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 1.0E-4};
 		((GridBagLayout)getLayout()).rowWeights = new double[] {0.0, 0.0, 1.0E-4};
 
 		//---- labelLabel ----
@@ -117,6 +118,13 @@ public class FlatComponentsTest
 		button4.setSelected(true);
 		button4.setEnabled(false);
 		add(button4, new GridBagConstraints(4, 1, 1, 1, 0.0, 0.0,
+			GridBagConstraints.CENTER, GridBagConstraints.BOTH,
+			new Insets(0, 0, 0, 5), 0, 0));
+
+		//---- button5 ----
+		button5.setText("default");
+		button5.setDisplayedMnemonicIndex(0);
+		add(button5, new GridBagConstraints(5, 1, 1, 1, 0.0, 0.0,
 			GridBagConstraints.CENTER, GridBagConstraints.BOTH,
 			new Insets(0, 0, 0, 0), 0, 0));
 		// JFormDesigner - End of component initialization  //GEN-END:initComponents
@@ -124,4 +132,15 @@ public class FlatComponentsTest
 
 	// JFormDesigner - Variables declaration - DO NOT MODIFY  //GEN-BEGIN:variables
 	// JFormDesigner - End of variables declaration  //GEN-END:variables
+
+	//---- class TestDefaultButton --------------------------------------------
+
+	private static class TestDefaultButton
+		extends JButton
+	{
+		@Override
+		public boolean isDefaultButton() {
+			return true;
+		}
+	}
 }

flatlaf-core/src/test/java/com/formdev/flatlaf/FlatComponentsTest.jfd

@@ -7,7 +7,7 @@ new FormModel {
 			"JavaCodeGenerator.defaultVariableLocal": true
 		}
 		add( new FormContainer( "javax.swing.JPanel", new FormLayoutManager( class java.awt.GridBagLayout ) {
-			"$columnSpecs": "0, 0, 0, 0, 0"
+			"$columnSpecs": "0, 0, 0, 0, 0, 0"
 			"$rowSpecs": "0, 0"
 			"$hGap": 5
 			"$vGap": 5
@@ -74,6 +74,14 @@ new FormModel {
 				"gridx": 4
 				"gridy": 1
 			} )
+			add( new FormComponent( "com.formdev.flatlaf.FlatComponentsTest$TestDefaultButton" ) {
+				name: "button5"
+				"text": "default"
+				"displayedMnemonicIndex": 0
+			}, new FormLayoutConstraints( class com.jformdesigner.runtime.GridBagConstraintsEx ) {
+				"gridx": 5
+				"gridy": 1
+			} )
 		}, new FormLayoutConstraints( null ) {
 			"location": new java.awt.Point( 0, 0 )
 			"size": new java.awt.Dimension( 580, 300 )

flatlaf-core/src/test/resources/com/formdev/flatlaf/FlatTestLaf.properties

@@ -29,6 +29,11 @@ Button.startBorderColor=ff0000
 Button.endBorderColor=0000ff
 Button.disabledBorderColor=000088
 
+Button.default.background=dddddd
+Button.default.foreground=880000
+Button.default.startBorderColor=ff0000
+Button.default.endBorderColor=ff0000
+
 
 #---- Label ----