Made selection highlight invisible when text component doesn't have focus.

core/src/main/java/com/github/weisj/darklaf/ui/text/DarkCaret.java

@@ -28,13 +28,8 @@ import com.github.weisj.darklaf.util.DarkUIUtil;
 import javax.swing.*;
 import javax.swing.plaf.TextUI;
 import javax.swing.plaf.UIResource;
-import javax.swing.text.BadLocationException;
-import javax.swing.text.DefaultCaret;
+import javax.swing.text.*;
 import javax.swing.text.DefaultHighlighterDark.DarkHighlightPainter;
-import javax.swing.text.Highlighter;
-import javax.swing.text.JTextComponent;
-import javax.swing.text.Position;
-import javax.swing.text.Segment;
 import java.awt.*;
 import java.awt.datatransfer.Clipboard;
 import java.awt.datatransfer.Transferable;
@@ -230,6 +225,15 @@ public class DarkCaret extends DefaultCaret implements UIResource {
         return selectionPainter;
     }
 
+    @Override
+    public boolean isSelectionVisible() {
+        return super.isSelectionVisible() && selectionPainter.isEnabled();
+    }
+
+    public void setPaintSelectionHighlight(final boolean paintSelectionHighlight) {
+        selectionPainter.setEnabled(paintSelectionHighlight);
+    }
+
     public boolean getPasteOnMiddleMouseClick() {
         return pasteOnMiddleMouseClick;
     }

core/src/main/java/com/github/weisj/darklaf/ui/text/DarkTextFieldUI.java

@@ -54,13 +54,6 @@ public class DarkTextFieldUI extends DarkTextFieldUIBridge implements PropertyCh
     protected static Icon clearHover;
     protected static Icon search;
     protected static Icon searchWithHistory;
-    private final FocusListener focusListener = new FocusAdapter() {
-        public void focusLost(final FocusEvent e) {
-            if (Boolean.FALSE.equals(getComponent().getClientProperty(KEY_KEEP_SELECTION_ON_FOCUS_LOST))) {
-                getComponent().select(0, 0);
-            }
-        }
-    };
     protected int arcSize;
     protected int searchArcSize;
     protected int borderSize;
@@ -284,7 +277,6 @@ public class DarkTextFieldUI extends DarkTextFieldUIBridge implements PropertyCh
         JTextComponent c = getComponent();
         c.addMouseListener(mouseListener);
         c.addMouseMotionListener(mouseMotionListener);
-        c.addFocusListener(focusListener);
         c.addKeyListener(keyListener);
     }
 
@@ -293,7 +285,6 @@ public class DarkTextFieldUI extends DarkTextFieldUIBridge implements PropertyCh
         JTextComponent c = getComponent();
         c.removeMouseListener(mouseListener);
         c.removeMouseMotionListener(mouseMotionListener);
-        c.removeFocusListener(focusListener);
         c.removeKeyListener(keyListener);
     }
 

core/src/main/java/com/github/weisj/darklaf/ui/text/DarkTextUI.java

@@ -61,11 +61,19 @@ public abstract class DarkTextUI extends BasicTextUI implements PropertyChangeLi
     private FocusListener focusListener = new FocusListener() {
         @Override
         public void focusGained(final FocusEvent e) {
+            Caret caret = editor.getCaret();
+            if (caret instanceof DarkCaret) {
+                ((DarkCaret) caret).setPaintSelectionHighlight(true);
+            }
             editor.repaint();
         }
 
         @Override
         public void focusLost(final FocusEvent e) {
+            Caret caret = editor.getCaret();
+            if (caret instanceof DarkCaret) {
+                ((DarkCaret) caret).setPaintSelectionHighlight(false);
+            }
             editor.repaint();
         }
     };

core/src/main/java/javax/swing/text/DefaultHighlighterDark/DarkHighlightPainter.java

@@ -59,6 +59,7 @@ public class DarkHighlightPainter extends DefaultHighlighter.DefaultHighlightPai
     private int repaintCount = 0;
     private int arcSize;
     private boolean suppressRounded = false;
+    private boolean enabled;
 
 
     public DarkHighlightPainter() {
@@ -81,11 +82,12 @@ public class DarkHighlightPainter extends DefaultHighlighter.DefaultHighlightPai
         setPaint(paint);
         setRoundedEdges(rounded);
         setAlpha(alpha);
+        setEnabled(true);
         arcSize = UIManager.getInt("Highlight.arc");
         wrapper = new ColorWrapper(color) {
             @Override
             public boolean equals(final Object obj) {
-                return obj != null;
+                return obj != null && enabled;
             }
         };
     }
@@ -116,6 +118,7 @@ public class DarkHighlightPainter extends DefaultHighlighter.DefaultHighlightPai
     @Override
     public void paint(final Graphics g, final int offs0, final int offs1, final Shape bounds,
                       final JTextComponent c) {
+        if (!enabled) return;
         Rectangle alloc = bounds.getBounds();
         Graphics2D g2d = (Graphics2D) g;
         GraphicsContext context = new GraphicsContext(g2d);
@@ -183,6 +186,7 @@ public class DarkHighlightPainter extends DefaultHighlighter.DefaultHighlightPai
     @Override
     public Shape paintLayer(final Graphics g, final int offs0, final int offs1,
                             final Shape bounds, final JTextComponent c, final View view) {
+        if (!enabled) return bounds;
         color = (Color) view.getAttributes().getAttribute(StyleConstantsEx.SelectedForeground);
         if (color == null) {
             color = c.getSelectedTextColor();
@@ -204,7 +208,7 @@ public class DarkHighlightPainter extends DefaultHighlighter.DefaultHighlightPai
             context.restore();
         }
         /*
-         * To make sure the the right part of the highlight is actually painted we manually repaint
+         * To make sure the correct part of the highlight is actually painted we manually repaint
          * after the selection has changed.
          */
         if (dirtyShape != null && (selectionEnd != c.getSelectionEnd()
@@ -521,4 +525,12 @@ public class DarkHighlightPainter extends DefaultHighlighter.DefaultHighlightPai
             g2d.setPaint(paint);
         }
     }
+
+    public boolean isEnabled() {
+        return enabled;
+    }
+
+    public void setEnabled(final boolean enabled) {
+        this.enabled = enabled;
+    }
 }