protected MouseInputListener createMouseInputListener()

in IDEtalk/core/src/jetbrains/communicator/util/MultipleSelectionListUI.java [20:120]
84 lines of code
21 McCabe index (conditional complexity)

  protected MouseInputListener createMouseInputListener() {
    return new MouseInputListener() {
      @Override
      public void mouseClicked(MouseEvent e) {}
      @Override
      public void mouseEntered(MouseEvent e) {}
      @Override
      public void mouseExited(MouseEvent e) {}
      @Override
      public void mousePressed(MouseEvent e) {
        if (e.isConsumed()) {
          selectedOnPress = false;
          return;
        }
        selectedOnPress = true;
        adjustFocusAndSelection(e);
      }

      void adjustFocusAndSelection(MouseEvent e) {
        if (!SwingUtilities.isLeftMouseButton(e)) {
          return;
        }

        if (!list.isEnabled()) {
          return;
        }

        /* Request focus before updating the list selection.  This implies
         * that the current focus owner will see a focusLost() event
         * before the lists selection is updated IF requestFocus() is
         * synchronous (it is on Windows).  See bug 4122345
         */
        if (!list.hasFocus() && list.isRequestFocusEnabled()) {
          IdeFocusManager.getGlobalInstance().doWhenFocusSettlesDown(() -> IdeFocusManager.getGlobalInstance().requestFocus(list, true));
        }

        int row = locationToIndex(list, e.getPoint());
        if (row != -1) {
          myLastPressedRow = row;
          boolean adjusting = e.getID() == MouseEvent.MOUSE_PRESSED;
          list.setValueIsAdjusting(adjusting);
          int anchorIndex = list.getAnchorSelectionIndex();
          if (e.isShiftDown() && (anchorIndex != -1)) {
            list.setSelectionInterval(anchorIndex, row);
          } else {
            toggleSelection(row);
          }
        }
      }

      @Override
      public void mouseDragged(MouseEvent e) {
        if (e.isConsumed()) {
          return;
        }
        if (!SwingUtilities.isLeftMouseButton(e)) {
          return;
        }
        if (!list.isEnabled()) {
          return;
        }
        if (e.isShiftDown() || e.isControlDown()) {
          return;
        }

        int row = locationToIndex(list, e.getPoint());
        if (row != -1 && row != myLastDraggedRow && row != myLastPressedRow) {
          myLastDraggedRow = row;
          Rectangle cellBounds = getCellBounds(list, row, row);
          if (cellBounds != null) {
            list.scrollRectToVisible(cellBounds);
            toggleSelection(row);
            //list.setSelectionInterval(row, row);
          }
        }
        if (row == -1) {
          list.clearSelection();
        }
      }

      @Override
      public void mouseMoved(MouseEvent e) {
      }

      @Override
      public void mouseReleased(MouseEvent e) {
        if (selectedOnPress) {
          if (!SwingUtilities.isLeftMouseButton(e)) {
            return;
          }

          list.setValueIsAdjusting(false);
        } else {
          adjustFocusAndSelection(e);
        }
      }

      private boolean selectedOnPress;

    };
  }