Package jmri.util

Class MenuScroller

java.lang.Object
jmri.util.MenuScroller
All Implemented Interfaces:
MouseWheelListener, EventListener
public class MenuScroller extends Object implements MouseWheelListener
A class that provides scrolling capabilities to a long menu dropdown or popup menu. A number of items can optionally be frozen at the top and/or bottom of the menu.

Implementation note: The default number of items to display at a time is 15, and the default scrolling interval is 125 milliseconds.

  • Constructor Summary

    Constructors
    Constructor
    Description
    MenuScroller(JMenu menu)
    Construct a MenuScroller that scrolls a menu with the default number of items to display at a time, and default scrolling interval.
    MenuScroller(JMenu menu, int scrollCount)
    Construct a MenuScroller that scrolls a menu with the specified number of items to display at a time, and default scrolling interval.
    MenuScroller(JMenu menu, int scrollCount, int interval)
    Construct a MenuScroller that scrolls a menu with the specified number of items to display at a time, and specified scrolling interval.
    MenuScroller(JMenu menu, int scrollCount, int interval, int topFixedCount, int bottomFixedCount)
    Construct a MenuScroller that scrolls a menu with the specified number of items to display in the scrolling region, the specified scrolling interval, and the specified numbers of items fixed at the top and bottom of the menu.
    MenuScroller(JPopupMenu menu)
    Construct a MenuScroller that scrolls a popup menu with the default number of items to display at a time, and default scrolling interval.
    MenuScroller(JPopupMenu menu, int scrollCount)
    Construct a MenuScroller that scrolls a popup menu with the specified number of items to display at a time, and default scrolling interval.
    MenuScroller(JPopupMenu menu, int scrollCount, int interval)
    Construct a MenuScroller that scrolls a popup menu with the specified number of items to display at a time, and specified scrolling interval.
    MenuScroller(JPopupMenu menu, int scrollCount, int interval, int topFixedCount, int bottomFixedCount)
    Construct a MenuScroller that scrolls a popup menu with the specified number of items to display in the scrolling region, the specified scrolling interval, and the specified numbers of items fixed at the top and bottom of the popup menu.

  • Method Summary

    Modifier and Type
    Method
    Description
    void
    dispose()
    Remove this MenuScroller from the associated menu and restores the default behavior of the menu.
    protected void
    finalize()
    Ensure that the dispose method of this MenuScroller is called when there are no more refrences to it.
    int
    getBottomFixedCount()
    Return the number of items fixed at the bottom of the menu or popup menu.
    int
    getInterval()
    Return the scroll interval in milliseconds.
    int
    getscrollCount()
    Return the number of items in the scrolling portion of the menu.
    int
    getTopFixedCount()
    Return the number of items fixed at the top of the menu or popup menu.
    void
    keepVisible(int index)
    Scroll the item at the specified index into view each time the menu is opened.
    void
    keepVisible(JMenuItem item)
    Scroll the specified item into view each time the menu is opened.
    void
    mouseWheelMoved(MouseWheelEvent e)
     
    void
    setBottomFixedCount(int bottomFixedCount)
    Set the number of items to fix at the bottom of the menu or popup menu.
    void
    setInterval(int interval)
    Set the scroll interval in milliseconds.
    void
    setScrollCount(int scrollCount)
    Set the number of items in the scrolling portion of the menu.
    static MenuScroller
    setScrollerFor(JMenu menu)
    Register a menu to be scrolled with the default number of items to display at a time and the default scrolling interval.
    static MenuScroller
    setScrollerFor(JMenu menu, int scrollCount)
    Register a menu to be scrolled with the default number of items to display at a time and the specified scrolling interval.
    static MenuScroller
    setScrollerFor(JMenu menu, int scrollCount, int interval)
    Register a menu to be scrolled, with the specified number of items to display at a time and the specified scrolling interval.
    static MenuScroller
    setScrollerFor(JMenu menu, int scrollCount, int interval, int topFixedCount, int bottomFixedCount)
    Register a menu to be scrolled, with the specified number of items to display in the scrolling region, the specified scrolling interval, and the specified numbers of items fixed at the top and bottom of the menu.
    static MenuScroller
    setScrollerFor(JPopupMenu menu)
    Register a popup menu to be scrolled with the default number of items to display at a time and the default scrolling interval.
    static MenuScroller
    setScrollerFor(JPopupMenu menu, int scrollCount)
    Register a popup menu to be scrolled with the default number of items to display at a time and the specified scrolling interval.
    static MenuScroller
    setScrollerFor(JPopupMenu menu, int scrollCount, int interval)
    Register a popup menu to be scrolled, with the specified number of items to display at a time and the specified scrolling interval.
    static MenuScroller
    setScrollerFor(JPopupMenu menu, int scrollCount, int interval, int topFixedCount, int bottomFixedCount)
    Register a popup menu to be scrolled, with the specified number of items to display in the scrolling region, the specified scrolling interval, and the specified numbers of items fixed at the top and bottom of the popup menu.
    void
    setTopFixedCount(int topFixedCount)
    Set the number of items to fix at the top of the menu or popup menu.

    Methods inherited from class java.lang.Object

    clone, equals, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

  • Constructor Details

    • MenuScroller

      public MenuScroller(JMenu menu)
      Construct a MenuScroller that scrolls a menu with the default number of items to display at a time, and default scrolling interval.
      Parameters:
      menu - the menu

    • MenuScroller

      public MenuScroller(JPopupMenu menu)
      Construct a MenuScroller that scrolls a popup menu with the default number of items to display at a time, and default scrolling interval.
      Parameters:
      menu - the popup menu

    • MenuScroller

      public MenuScroller(JMenu menu, int scrollCount)
      Construct a MenuScroller that scrolls a menu with the specified number of items to display at a time, and default scrolling interval.
      Parameters:
      menu - the menu
      scrollCount - the number of items to display at a time
      Throws:
      IllegalArgumentException - if scrollCount is 0 or negative

    • MenuScroller

      public MenuScroller(JPopupMenu menu, int scrollCount)
      Construct a MenuScroller that scrolls a popup menu with the specified number of items to display at a time, and default scrolling interval.
      Parameters:
      menu - the popup menu
      scrollCount - the number of items to display at a time
      Throws:
      IllegalArgumentException - if scrollCount is 0 or negative

    • MenuScroller

      public MenuScroller(JMenu menu, int scrollCount, int interval)
      Construct a MenuScroller that scrolls a menu with the specified number of items to display at a time, and specified scrolling interval.
      Parameters:
      menu - the menu
      scrollCount - the number of items to display at a time
      interval - the scroll interval, in milliseconds
      Throws:
      IllegalArgumentException - if scrollCount or interval is 0 or negative

    • MenuScroller

      public MenuScroller(JPopupMenu menu, int scrollCount, int interval)
      Construct a MenuScroller that scrolls a popup menu with the specified number of items to display at a time, and specified scrolling interval.
      Parameters:
      menu - the popup menu
      scrollCount - the number of items to display at a time
      interval - the scroll interval, in milliseconds
      Throws:
      IllegalArgumentException - if scrollCount or interval is 0 or negative

    • MenuScroller

      public MenuScroller(JMenu menu, int scrollCount, int interval, int topFixedCount, int bottomFixedCount)
      Construct a MenuScroller that scrolls a menu with the specified number of items to display in the scrolling region, the specified scrolling interval, and the specified numbers of items fixed at the top and bottom of the menu.
      Parameters:
      menu - the menu
      scrollCount - the number of items to display in the scrolling portion
      interval - the scroll interval, in milliseconds
      topFixedCount - the number of items to fix at the top. May be 0
      bottomFixedCount - the number of items to fix at the bottom. May be 0
      Throws:
      IllegalArgumentException - if scrollCount or interval is 0 or negative or if topFixedCount or bottomFixedCount is negative

    • MenuScroller

      public MenuScroller(JPopupMenu menu, int scrollCount, int interval, int topFixedCount, int bottomFixedCount)
      Construct a MenuScroller that scrolls a popup menu with the specified number of items to display in the scrolling region, the specified scrolling interval, and the specified numbers of items fixed at the top and bottom of the popup menu.
      Parameters:
      menu - the popup menu
      scrollCount - the number of items to display in the scrolling portion
      interval - the scroll interval, in milliseconds
      topFixedCount - the number of items to fix at the top. May be 0
      bottomFixedCount - the number of items to fix at the bottom. May be 0
      Throws:
      IllegalArgumentException - if scrollCount or interval is 0 or negative or if topFixedCount or bottomFixedCount is negative

  • Method Details

    • setScrollerFor

      public static MenuScroller setScrollerFor(JMenu menu)
      Register a menu to be scrolled with the default number of items to display at a time and the default scrolling interval.
      Parameters:
      menu - the menu
      Returns:
      the MenuScroller

    • setScrollerFor

      public static MenuScroller setScrollerFor(JPopupMenu menu)
      Register a popup menu to be scrolled with the default number of items to display at a time and the default scrolling interval.
      Parameters:
      menu - the popup menu
      Returns:
      the MenuScroller

    • setScrollerFor

      public static MenuScroller setScrollerFor(JMenu menu, int scrollCount)
      Register a menu to be scrolled with the default number of items to display at a time and the specified scrolling interval.
      Parameters:
      menu - the menu
      scrollCount - the number of items to display at a time
      Returns:
      the MenuScroller
      Throws:
      IllegalArgumentException - if scrollCount is 0 or negative

    • setScrollerFor

      public static MenuScroller setScrollerFor(JPopupMenu menu, int scrollCount)
      Register a popup menu to be scrolled with the default number of items to display at a time and the specified scrolling interval.
      Parameters:
      menu - the popup menu
      scrollCount - the number of items to display at a time
      Returns:
      the MenuScroller
      Throws:
      IllegalArgumentException - if scrollCount is 0 or negative

    • setScrollerFor

      public static MenuScroller setScrollerFor(JMenu menu, int scrollCount, int interval)
      Register a menu to be scrolled, with the specified number of items to display at a time and the specified scrolling interval.
      Parameters:
      menu - the menu
      scrollCount - the number of items to be displayed at a time
      interval - the scroll interval, in milliseconds
      Returns:
      the MenuScroller
      Throws:
      IllegalArgumentException - if scrollCount or interval is 0 or negative

    • setScrollerFor

      public static MenuScroller setScrollerFor(JPopupMenu menu, int scrollCount, int interval)
      Register a popup menu to be scrolled, with the specified number of items to display at a time and the specified scrolling interval.
      Parameters:
      menu - the popup menu
      scrollCount - the number of items to be displayed at a time
      interval - the scroll interval, in milliseconds
      Returns:
      the MenuScroller
      Throws:
      IllegalArgumentException - if scrollCount or interval is 0 or negative

    • setScrollerFor

      public static MenuScroller setScrollerFor(JMenu menu, int scrollCount, int interval, int topFixedCount, int bottomFixedCount)
      Register a menu to be scrolled, with the specified number of items to display in the scrolling region, the specified scrolling interval, and the specified numbers of items fixed at the top and bottom of the menu.
      Parameters:
      menu - the menu
      scrollCount - the number of items to display in the scrolling portion
      interval - the scroll interval, in milliseconds
      topFixedCount - the number of items to fix at the top. May be 0.
      bottomFixedCount - the number of items to fix at the bottom. May be 0
      Returns:
      the MenuScroller
      Throws:
      IllegalArgumentException - if scrollCount or interval is 0 or negative or if topFixedCount or bottomFixedCount is negative

    • setScrollerFor

      public static MenuScroller setScrollerFor(JPopupMenu menu, int scrollCount, int interval, int topFixedCount, int bottomFixedCount)
      Register a popup menu to be scrolled, with the specified number of items to display in the scrolling region, the specified scrolling interval, and the specified numbers of items fixed at the top and bottom of the popup menu.
      Parameters:
      menu - the popup menu
      scrollCount - the number of items to display in the scrolling portion
      interval - the scroll interval, in milliseconds
      topFixedCount - the number of items to fix at the top. May be 0
      bottomFixedCount - the number of items to fix at the bottom. May be 0
      Returns:
      the MenuScroller
      Throws:
      IllegalArgumentException - if scrollCount or interval is 0 or negative or if topFixedCount or bottomFixedCount is negative

    • mouseWheelMoved

      public void mouseWheelMoved(MouseWheelEvent e)
      Specified by:
      mouseWheelMoved in interface MouseWheelListener

    • getInterval

      public int getInterval()
      Return the scroll interval in milliseconds.
      Returns:
      the scroll interval in milliseconds

    • setInterval

      public void setInterval(int interval)
      Set the scroll interval in milliseconds.
      Parameters:
      interval - the scroll interval in milliseconds
      Throws:
      IllegalArgumentException - if interval is 0 or negative

    • getscrollCount

      public int getscrollCount()
      Return the number of items in the scrolling portion of the menu.
      Returns:
      the number of items to display at a time

    • setScrollCount

      public void setScrollCount(int scrollCount)
      Set the number of items in the scrolling portion of the menu.
      Parameters:
      scrollCount - the number of items to display at a time
      Throws:
      IllegalArgumentException - if scrollCount is 0 or negative

    • getTopFixedCount

      public int getTopFixedCount()
      Return the number of items fixed at the top of the menu or popup menu.
      Returns:
      the number of items

    • setTopFixedCount

      public void setTopFixedCount(int topFixedCount)
      Set the number of items to fix at the top of the menu or popup menu.
      Parameters:
      topFixedCount - the number of items

    • getBottomFixedCount

      public int getBottomFixedCount()
      Return the number of items fixed at the bottom of the menu or popup menu.
      Returns:
      the number of items

    • setBottomFixedCount

      public void setBottomFixedCount(int bottomFixedCount)
      Set the number of items to fix at the bottom of the menu or popup menu.
      Parameters:
      bottomFixedCount - the number of items

    • keepVisible

      public void keepVisible(JMenuItem item)
      Scroll the specified item into view each time the menu is opened. Call this method with null to restore the default behavior, which is to show the menu as it last appeared.
      Parameters:
      item - the item to keep visible
      See Also:

    • keepVisible

      public void keepVisible(int index)
      Scroll the item at the specified index into view each time the menu is opened. Call this method with -1 to restore the default behavior, which is to show the menu as it last appeared.
      Parameters:
      index - the index of the item to keep visible
      See Also:

    • dispose

      public void dispose()
      Remove this MenuScroller from the associated menu and restores the default behavior of the menu.

    • finalize

      protected void finalize() throws Throwable
      Ensure that the dispose method of this MenuScroller is called when there are no more refrences to it.
      Overrides:
      finalize in class Object
      Throws:
      Throwable - if an error occurs.
      See Also: