IDEA-193662: Tabbed Pane: focused state

platform/platform-impl/src/com/intellij/ide/ui/laf/darcula/darcula.properties

@@ -84,6 +84,7 @@ TabbedPane.tabSelectionHeight=2
 TabbedPane.selectedColor=4890cf
 TabbedPane.selectedDisabledColor=7a7a7a
 TabbedPane.hoverColor=2e3133
+TabbedPane.focusColor=3d4b5c
 TabbedPane.selectedLabelShift=0
 TabbedPane.contentAreaColor=6b6b6b
 # tabFillStyle can take "underline" or "fill" values

platform/platform-impl/src/com/intellij/ide/ui/laf/darcula/ui/DarculaTabbedPaneUI.java

@@ -163,7 +163,16 @@ public class DarculaTabbedPaneUI extends BasicTabbedPaneUI {
 
       case underline:
       default:
-        g.setColor(tabPane.isEnabled() && tabIndex == hoverTab ? HOVER_COLOR : tabPane.getBackground());
+        Color c = tabPane.getBackground();
+        if (tabPane.isEnabled()) {
+          if (tabPane.hasFocus() && isSelected) {
+            c = FOCUS_COLOR;
+          } else if (tabIndex == hoverTab) {
+            c = HOVER_COLOR;
+          }
+        }
+
+        g.setColor(c);
         break;
     }
 
@@ -330,4 +339,8 @@ public class DarculaTabbedPaneUI extends BasicTabbedPaneUI {
 
   @Override
   protected void paintContentBorderBottomEdge(Graphics g, int tabPlacement, int selectedIndex, int x, int y, int w, int h) {}
-}
+
+  @Override
+  protected void paintFocusIndicator(Graphics g, int tabPlacement, Rectangle[] rects, int tabIndex, Rectangle iconRect, Rectangle textRect,
+                                     boolean isSelected) {}
+  }

platform/platform-impl/src/com/intellij/ide/ui/laf/intellijlaf.properties

@@ -226,6 +226,7 @@ TabbedPane.tabSelectionHeight=2
 TabbedPane.selectedColor=357ecc
 TabbedPane.selectedDisabledColor=ababab
 TabbedPane.hoverColor=d9d9d9
+TabbedPane.focusColor=dae4ed
 TabbedPane.selectedLabelShift=0
 TabbedPane.contentAreaColor=bfbfbf
 # tabFillStyle can take "underline" or "fill" values

platform/platform-impl/src/com/intellij/ide/ui/laf/intellijlaf_mac.properties

@@ -68,6 +68,7 @@ TabbedPane.tabSelectionHeight=2
 TabbedPane.selectedColor=357ecc
 TabbedPane.selectedDisabledColor=ababab
 TabbedPane.hoverColor=d9d9d9
+TabbedPane.focusColor=dae4ed
 TabbedPane.selectedLabelShift=0
 TabbedPane.contentAreaColor=bfbfbf
 # tabFillStyle can take "underline" or "fill" values

platform/platform-impl/src/com/intellij/ide/ui/laf/intellijlaf_native.properties

@@ -196,6 +196,7 @@ TabbedPane.tabSelectionHeight=2
 TabbedPane.selectedColor=357ecc
 TabbedPane.selectedDisabledColor=ababab
 TabbedPane.hoverColor=d9d9d9
+TabbedPane.focusColor=dae4ed
 TabbedPane.selectedLabelShift=0
 TabbedPane.contentAreaColor=bfbfbf
 # tabFillStyle can take "underline" or "fill" values

platform/platform-impl/src/com/intellij/internal/ui/ComponentPanelTestAction.java

@@ -5,6 +5,7 @@ import com.intellij.openapi.actionSystem.AnActionEvent;
 import com.intellij.openapi.application.ModalityState;
 import com.intellij.openapi.project.DumbAwareAction;
 import com.intellij.openapi.project.Project;
+import com.intellij.openapi.ui.ComboBox;
 import com.intellij.openapi.ui.ComponentWithBrowseButton;
 import com.intellij.openapi.ui.DialogWrapper;
 import com.intellij.openapi.ui.panel.ComponentPanel;
@@ -21,6 +22,8 @@ import com.intellij.util.ObjectUtils;
 import com.intellij.util.ui.JBUI;
 import com.intellij.util.ui.UI;
 import com.intellij.util.ui.UIUtil;
+import com.intellij.util.ui.components.BorderLayoutPanel;
+import org.intellij.lang.annotations.MagicConstant;
 import org.jetbrains.annotations.Nullable;
 
 import javax.swing.*;
@@ -30,6 +33,31 @@ import java.awt.*;
 import java.util.Arrays;
 
 public class ComponentPanelTestAction extends DumbAwareAction {
+  private enum Placement {
+    Top    (SwingConstants.TOP, "Top"),
+    Bottom (SwingConstants.BOTTOM, "Bottom"),
+    Left   (SwingConstants.LEFT, "Left"),
+    Right  (SwingConstants.RIGHT, "Right");
+
+    private final String name;
+    private final int placement;
+
+    Placement(int placement, String name) {
+      this.name = name;
+      this.placement = placement;
+    }
+
+    @Override
+    public String toString() {
+      return name;
+    }
+
+    @MagicConstant(intValues = {SwingConstants.TOP, SwingConstants.BOTTOM, SwingConstants.LEFT, SwingConstants.RIGHT})
+    public int placement() {
+      return placement;
+    }
+  }
+
   @Override
   public void actionPerformed(AnActionEvent e) {
     Project project = e.getProject();
@@ -65,9 +93,6 @@ public class ComponentPanelTestAction extends DumbAwareAction {
         pane.addTab(title, JBUI.Panels.simplePanel(label));
       }
 
-      //pane.setTabLayoutPolicy(JTabbedPane.SCROLL_TAB_LAYOUT);
-      //pane.putClientProperty("JTabbedPane.hasFullBorder", Boolean.TRUE);
-
       pane.addChangeListener(e -> {
         if (pane.getSelectedIndex() == 2) {
           myAlarm.addRequest(progressTimerRequest, 200, ModalityState.any());
@@ -76,7 +101,29 @@ public class ComponentPanelTestAction extends DumbAwareAction {
         }
       });
 
-      return pane;
+      BorderLayoutPanel panel = JBUI.Panels.simplePanel(pane);
+
+      JPanel southPanel = new JPanel();
+      southPanel.setLayout(new BoxLayout(southPanel, BoxLayout.X_AXIS));
+
+      JCheckBox enabledCB = new JCheckBox("Enable TabPane", true);
+      enabledCB.addActionListener(e -> pane.setEnabled(enabledCB.isSelected()));
+      southPanel.add(enabledCB);
+
+      southPanel.add(Box.createRigidArea(JBUI.size(UIUtil.DEFAULT_HGAP, 0)));
+
+      JComboBox<Placement> placementCombo = new ComboBox<>(Placement.values());
+      placementCombo.setSelectedIndex(0);
+      placementCombo.addActionListener(e -> {
+        Placement p = (Placement)placementCombo.getSelectedItem();
+        if (p != null) pane.setTabPlacement(p.placement());
+      });
+      southPanel.add(placementCombo);
+      southPanel.add(new Box.Filler(JBUI.size(0), JBUI.size(0), JBUI.size(Integer.MAX_VALUE, 0)));
+
+      panel.addToBottom(southPanel);
+
+      return panel;
     }
 
     private JComponent createComponentPanel() {

platform/util/src/com/intellij/util/ui/JBUI.java

@@ -1645,6 +1645,7 @@ public class JBUI {
       public static final Color DISABLED_SELECTED_COLOR = JBColor.namedColor("TabbedPane.selectedDisabledColor", Gray.xAB);
       public static final Color DISABLED_TEXT_COLOR = JBColor.namedColor("TabbedPane.disabledText", Gray.x99);
       public static final Color HOVER_COLOR = JBColor.namedColor("TabbedPane.hoverColor", Gray.xD9);
+      public static final Color FOCUS_COLOR = JBColor.namedColor("TabbedPane.focusColor", 0xDAE4ED);
       public static final JBValue TAB_HEIGHT = new JBValue.UIInteger("TabbedPane.tabHeight", 32);
       public static final JBValue SELECTION_HEIGHT = new JBValue.UIInteger("TabbedPane.tabSelectionHeight", 2);
     }