private void updateBackground() {
   if (UIUtil.isUnderDarcula()) {
     setBackgroundImage(IconLoader.getIcon("/frame_background.png"));
     String icon = ApplicationInfoEx.getInstanceEx().getEditorBackgroundImageUrl();
     if (icon != null) setCenterImage(IconLoader.getIcon(icon));
   } else {
     setBackgroundImage(null);
     setCenterImage(null);
   }
 }
  private class CloseTab extends AnAction implements DumbAware {

    ShadowAction myShadow;
    private final TabInfo myTabInfo;
    private final Icon myIcon = IconLoader.getIcon("/actions/close.png");
    private final Icon myNewIcon = IconLoader.getIcon("/actions/closeNew.png");
    private final Icon myHoveredIcon = IconLoader.getIcon("/actions/closeHovered.png");
    private final Icon myNewHoveredIcon = IconLoader.getIcon("/actions/closeNewHovered.png");

    public CloseTab(JComponent c, TabInfo info) {
      myTabInfo = info;
      myShadow =
          new ShadowAction(this, ActionManager.getInstance().getAction(IdeActions.ACTION_CLOSE), c);
    }

    @Override
    public void update(final AnActionEvent e) {
      e.getPresentation().setIcon(myTabs.isEditorTabs() ? myNewIcon : myIcon);
      e.getPresentation().setHoveredIcon(myTabs.isEditorTabs() ? myNewHoveredIcon : myHoveredIcon);
      e.getPresentation().setVisible(UISettings.getInstance().SHOW_CLOSE_BUTTON);
      e.getPresentation().setText("Close. Alt-click to close others.");
    }

    public void actionPerformed(final AnActionEvent e) {
      final FileEditorManagerEx mgr = FileEditorManagerEx.getInstanceEx(myProject);
      EditorWindow window;
      final VirtualFile file = (VirtualFile) myTabInfo.getObject();
      if (ActionPlaces.EDITOR_TAB.equals(e.getPlace())) {
        window = myWindow;
      } else {
        window = mgr.getCurrentWindow();
      }

      if (window != null) {
        if ((e.getModifiers() & InputEvent.ALT_MASK) != 0) {
          window.closeAllExcept(file);
        } else {
          if (window.findFileComposite(file) != null) {
            mgr.closeFile(file, window);
          }
        }
      }
    }
  }
  AbstractPopup init(
      final Project project,
      @NotNull final JComponent component,
      @Nullable final JComponent preferredFocusedComponent,
      final boolean requestFocus,
      final boolean focusable,
      final boolean forceHeavyweight,
      final boolean movable,
      final String dimensionServiceKey,
      final boolean resizable,
      @Nullable final String caption,
      @Nullable final Computable<Boolean> callback,
      final boolean cancelOnClickOutside,
      @Nullable final Set<JBPopupListener> listeners,
      final boolean useDimServiceForXYLocation,
      InplaceButton commandButton,
      @Nullable final IconButton cancelButton,
      @Nullable final MouseChecker cancelOnMouseOutCallback,
      final boolean cancelOnWindow,
      @Nullable final ActiveIcon titleIcon,
      final boolean cancelKeyEnabled,
      final boolean locateBycontent,
      final boolean placeWithinScreenBounds,
      @Nullable final Dimension minSize,
      float alpha,
      @Nullable MaskProvider maskProvider,
      boolean inStack,
      boolean modalContext,
      @Nullable Component[] focusOwners,
      @Nullable String adText,
      int adTextAlignment,
      final boolean headerAlwaysFocusable,
      @NotNull List<Pair<ActionListener, KeyStroke>> keyboardActions,
      Component settingsButtons,
      @Nullable final Processor<JBPopup> pinCallback,
      boolean mayBeParent,
      boolean showShadow) {
    if (requestFocus && !focusable) {
      assert false
          : "Incorrect argument combination: requestFocus="
              + requestFocus
              + " focusable="
              + focusable;
    }

    myActivityKey = new UiActivity.Focus("Popup:" + this);
    myProject = project;
    myComponent = component;
    myPopupBorder = PopupBorder.Factory.create(true, showShadow);
    myShadowed = showShadow;
    myPaintShadow =
        showShadow
            && !SystemInfo.isMac
            && !movable
            && !resizable
            && Registry.is("ide.popup.dropShadow");
    myContent = createContentPanel(resizable, myPopupBorder, isToDrawMacCorner() && resizable);
    myMayBeParent = mayBeParent;

    myContent.add(component, BorderLayout.CENTER);
    if (adText != null) {
      setAdText(adText, adTextAlignment);
    }

    myCancelKeyEnabled = cancelKeyEnabled;
    myLocateByContent = locateBycontent;
    myLocateWithinScreen = placeWithinScreenBounds;
    myAlpha = alpha;
    myMaskProvider = maskProvider;
    myInStack = inStack;
    myModalContext = modalContext;
    myFocusOwners = focusOwners;
    myHeaderAlwaysFocusable = headerAlwaysFocusable;
    myMovable = movable;

    ActiveIcon actualIcon = titleIcon == null ? new ActiveIcon(EmptyIcon.ICON_0) : titleIcon;

    myHeaderPanel = new JPanel(new BorderLayout());

    if (caption != null) {
      if (caption.length() > 0) {
        myCaption = new TitlePanel(actualIcon.getRegular(), actualIcon.getInactive());
        ((TitlePanel) myCaption).setText(caption);
      } else {
        myCaption = new CaptionPanel();
      }

      if (pinCallback != null) {
        myCaption.setButtonComponent(
            new InplaceButton(
                new IconButton(
                    "Pin",
                    IconLoader.getIcon("/general/autohideOff.png"),
                    IconLoader.getIcon("/general/autohideOff.png"),
                    IconLoader.getIcon("/general/autohideOffInactive.png")),
                new ActionListener() {
                  public void actionPerformed(final ActionEvent e) {
                    pinCallback.process(AbstractPopup.this);
                  }
                }));
      } else if (cancelButton != null) {
        myCaption.setButtonComponent(
            new InplaceButton(
                cancelButton,
                new ActionListener() {
                  public void actionPerformed(final ActionEvent e) {
                    cancel();
                  }
                }));
      } else if (commandButton != null) {
        myCaption.setButtonComponent(commandButton);
      }
    } else {
      myCaption = new CaptionPanel();
      myCaption.setBorder(null);
      myCaption.setPreferredSize(new Dimension(0, 0));
    }

    setWindowActive(myHeaderAlwaysFocusable);

    myHeaderPanel.add(myCaption, BorderLayout.NORTH);
    myContent.add(myHeaderPanel, BorderLayout.NORTH);

    myForcedHeavyweight = true;
    myResizable = resizable;
    myPreferredFocusedComponent = preferredFocusedComponent;
    myRequestFocus = requestFocus;
    myFocusable = focusable;
    myDimensionServiceKey = dimensionServiceKey;
    myCallBack = callback;
    myCancelOnClickOutside = cancelOnClickOutside;
    myCancelOnMouseOutCallback = cancelOnMouseOutCallback;
    myListeners = listeners == null ? new HashSet<JBPopupListener>() : listeners;
    myUseDimServiceForXYLocation = useDimServiceForXYLocation;
    myCancelOnWindow = cancelOnWindow;
    myMinSize = minSize;

    for (Pair<ActionListener, KeyStroke> pair : keyboardActions) {
      myContent.registerKeyboardAction(
          pair.getFirst(), pair.getSecond(), JComponent.WHEN_IN_FOCUSED_WINDOW);
    }

    if (settingsButtons != null) {
      myCaption.addSettingsComponent(settingsButtons);
    }

    return this;
  }