Package org.eclipse.swt.widgets

Class Menu

java.lang.Object
org.eclipse.swt.widgets.Widget
org.eclipse.swt.widgets.Menu
public class Menu extends Widget
Instances of this class are user interface objects that contain menu items.
Styles:
BAR, DROP_DOWN, POP_UP, NO_RADIO_GROUP
LEFT_TO_RIGHT, RIGHT_TO_LEFT
Events:
Help, Hide, Show

Note: Only one of BAR, DROP_DOWN and POP_UP may be specified. Only one of LEFT_TO_RIGHT or RIGHT_TO_LEFT may be specified.

IMPORTANT: This class is not intended to be subclassed.

See Also:
Restriction:
This class is not intended to be subclassed by clients.

  • Field Summary

    Fields
    Modifier and Type
    Field
    Description
    long
    handle
    the handle to the OS resource (Warning: This field is platform dependent)

  • Constructor Summary

    Constructors
    Constructor
    Description
    Menu(Control parent)
    Constructs a new instance of this class given its parent, and sets the style for the instance so that the instance will be a popup menu on the given parent's shell.
    Menu(Decorations parent, int style)
    Constructs a new instance of this class given its parent (which must be a Decorations) and a style value describing its behavior and appearance.
    Menu(Menu parentMenu)
    Constructs a new instance of this class given its parent (which must be a Menu) and sets the style for the instance so that the instance will be a drop-down menu on the given parent's parent.
    Menu(MenuItem parentItem)
    Constructs a new instance of this class given its parent (which must be a MenuItem) and sets the style for the instance so that the instance will be a drop-down menu on the given parent's parent menu.

  • Method Summary

    Modifier and Type
    Method
    Description
    void
    addHelpListener(HelpListener listener)
    Adds the listener to the collection of listeners who will be notified when help events are generated for the control, by sending it one of the messages defined in the HelpListener interface.
    void
    addMenuListener(MenuListener listener)
    Adds the listener to the collection of listeners who will be notified when menus are hidden or shown, by sending it one of the messages defined in the MenuListener interface.
    MenuItem
    getDefaultItem()
    Returns the default menu item or null if none has been previously set.
    boolean
    getEnabled()
    Returns true if the receiver is enabled, and false otherwise.
    MenuItem
    getItem(int index)
    Returns the item at the given, zero-relative index in the receiver.
    int
    getItemCount()
    Returns the number of items contained in the receiver.
    MenuItem[]
    getItems()
    Returns a (possibly empty) array of MenuItems which are the items in the receiver.
    int
    getOrientation()
    Returns the orientation of the receiver, which will be one of the constants SWT.LEFT_TO_RIGHT or SWT.RIGHT_TO_LEFT.
    Decorations
    getParent()
    Returns the receiver's parent, which must be a Decorations.
    MenuItem
    getParentItem()
    Returns the receiver's parent item, which must be a MenuItem or null when the receiver is a root.
    Menu
    getParentMenu()
    Returns the receiver's parent item, which must be a Menu or null when the receiver is a root.
    Shell
    getShell()
    Returns the receiver's shell.
    boolean
    getVisible()
    Returns true if the receiver is visible, and false otherwise.
    int
    indexOf(MenuItem item)
    Searches the receiver's list starting at the first item (index 0) until an item is found that is equal to the argument, and returns the index of that item.
    boolean
    isEnabled()
    Returns true if the receiver is enabled and all of the receiver's ancestors are enabled, and false otherwise.
    boolean
    isVisible()
    Returns true if the receiver is visible and all of the receiver's ancestors are visible and false otherwise.
    void
    removeHelpListener(HelpListener listener)
    Removes the listener from the collection of listeners who will be notified when the help events are generated for the control.
    void
    removeMenuListener(MenuListener listener)
    Removes the listener from the collection of listeners who will be notified when the menu events are generated for the control.
    void
    setDefaultItem(MenuItem item)
    Sets the default menu item to the argument or removes the default emphasis when the argument is null.
    void
    setEnabled(boolean enabled)
    Enables the receiver if the argument is true, and disables it otherwise.
    void
    setLocation(int x, int y)
    Sets the location of the receiver, which must be a popup, to the point specified by the arguments which are relative to the display.
    void
    setLocation(Point location)
    Sets the location of the receiver, which must be a popup, to the point specified by the argument which is relative to the display.
    void
    setOrientation(int orientation)
    Sets the orientation of the receiver, which must be one of the constants SWT.LEFT_TO_RIGHT or SWT.RIGHT_TO_LEFT.
    void
    setVisible(boolean visible)
    Marks the receiver as visible if the argument is true, and marks it invisible otherwise.

    Methods inherited from class org.eclipse.swt.widgets.Widget

    addDisposeListener, addListener, checkSubclass, checkWidget, dispose, getData, getData, getDisplay, getListeners, getStyle, isAutoDirection, isDisposed, isListening, notifyListeners, removeDisposeListener, removeListener, removeListener, reskin, setData, setData, toString

    Methods inherited from class java.lang.Object

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

  • Field Details

    • handle

      public long handle
      the handle to the OS resource (Warning: This field is platform dependent)

      IMPORTANT: This field is not part of the SWT public API. It is marked public only so that it can be shared within the packages provided by SWT. It is not available on all platforms and should never be accessed from application code.

      Restriction:
      This field is not intended to be referenced by clients.

  • Constructor Details

    • Menu

      public Menu(Control parent)
      Constructs a new instance of this class given its parent, and sets the style for the instance so that the instance will be a popup menu on the given parent's shell.

      After constructing a menu, it can be set into its parent using parent.setMenu(menu). In this case, the parent may be any control in the same widget tree as the parent.

      Parameters:
      parent - a control which will be the parent of the new instance (cannot be null)
      Throws:
      IllegalArgumentException -
      • ERROR_NULL_ARGUMENT - if the parent is null
      SWTException -
      • ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the parent
      • ERROR_INVALID_SUBCLASS - if this class is not an allowed subclass
      See Also:

    • Menu

      public Menu(Decorations parent, int style)
      Constructs a new instance of this class given its parent (which must be a Decorations) and a style value describing its behavior and appearance.

      The style value is either one of the style constants defined in class SWT which is applicable to instances of this class, or must be built by bitwise OR'ing together (that is, using the int "|" operator) two or more of those SWT style constants. The class description lists the style constants that are applicable to the class. Style bits are also inherited from superclasses.

      After constructing a menu or menuBar, it can be set into its parent using parent.setMenu(menu) or parent.setMenuBar(menuBar).

      Parameters:
      parent - a decorations control which will be the parent of the new instance (cannot be null)
      style - the style of menu to construct
      Throws:
      IllegalArgumentException -
      • ERROR_NULL_ARGUMENT - if the parent is null
      SWTException -
      • ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the parent
      • ERROR_INVALID_SUBCLASS - if this class is not an allowed subclass
      See Also:

    • Menu

      public Menu(Menu parentMenu)
      Constructs a new instance of this class given its parent (which must be a Menu) and sets the style for the instance so that the instance will be a drop-down menu on the given parent's parent.

      After constructing a drop-down menu, it can be set into its parentMenu using parentMenu.setMenu(menu).

      Parameters:
      parentMenu - a menu which will be the parent of the new instance (cannot be null)
      Throws:
      IllegalArgumentException -
      • ERROR_NULL_ARGUMENT - if the parent is null
      SWTException -
      • ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the parent
      • ERROR_INVALID_SUBCLASS - if this class is not an allowed subclass
      See Also:

    • Menu

      public Menu(MenuItem parentItem)
      Constructs a new instance of this class given its parent (which must be a MenuItem) and sets the style for the instance so that the instance will be a drop-down menu on the given parent's parent menu.

      After constructing a drop-down menu, it can be set into its parentItem using parentItem.setMenu(menu).

      Parameters:
      parentItem - a menu item which will be the parent of the new instance (cannot be null)
      Throws:
      IllegalArgumentException -
      • ERROR_NULL_ARGUMENT - if the parent is null
      SWTException -
      • ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the parent
      • ERROR_INVALID_SUBCLASS - if this class is not an allowed subclass
      See Also:

  • Method Details

    • addHelpListener

      public void addHelpListener(HelpListener listener)
      Adds the listener to the collection of listeners who will be notified when help events are generated for the control, by sending it one of the messages defined in the HelpListener interface.
      Parameters:
      listener - the listener which should be notified
      Throws:
      IllegalArgumentException -
      • ERROR_NULL_ARGUMENT - if the listener is null
      SWTException -
      • ERROR_WIDGET_DISPOSED - if the receiver has been disposed
      • ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver
      See Also:

    • addMenuListener

      public void addMenuListener(MenuListener listener)
      Adds the listener to the collection of listeners who will be notified when menus are hidden or shown, by sending it one of the messages defined in the MenuListener interface.
      Parameters:
      listener - the listener which should be notified
      Throws:
      IllegalArgumentException -
      • ERROR_NULL_ARGUMENT - if the listener is null
      SWTException -
      • ERROR_WIDGET_DISPOSED - if the receiver has been disposed
      • ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver
      See Also:

    • getDefaultItem

      public MenuItem getDefaultItem()
      Returns the default menu item or null if none has been previously set.
      Returns:
      the default menu item.
      Throws:
      SWTException -
      • ERROR_WIDGET_DISPOSED - if the receiver has been disposed
      • ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver

    • getEnabled

      public boolean getEnabled()
      Returns true if the receiver is enabled, and false otherwise. A disabled menu is typically not selectable from the user interface and draws with an inactive or "grayed" look.
      Returns:
      the receiver's enabled state
      Throws:
      SWTException -
      • ERROR_WIDGET_DISPOSED - if the receiver has been disposed
      • ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver
      See Also:

    • getItem

      public MenuItem getItem(int index)
      Returns the item at the given, zero-relative index in the receiver. Throws an exception if the index is out of range.
      Parameters:
      index - the index of the item to return
      Returns:
      the item at the given index
      Throws:
      IllegalArgumentException -
      • ERROR_INVALID_RANGE - if the index is not between 0 and the number of elements in the list minus 1 (inclusive)
      SWTException -
      • ERROR_WIDGET_DISPOSED - if the receiver has been disposed
      • ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver

    • getItemCount

      public int getItemCount()
      Returns the number of items contained in the receiver.
      Returns:
      the number of items
      Throws:
      SWTException -
      • ERROR_WIDGET_DISPOSED - if the receiver has been disposed
      • ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver

    • getItems

      public MenuItem[] getItems()
      Returns a (possibly empty) array of MenuItems which are the items in the receiver.

      Note: This is not the actual structure used by the receiver to maintain its list of items, so modifying the array will not affect the receiver.

      Returns:
      the items in the receiver
      Throws:
      SWTException -
      • ERROR_WIDGET_DISPOSED - if the receiver has been disposed
      • ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver

    • getOrientation

      public int getOrientation()
      Returns the orientation of the receiver, which will be one of the constants SWT.LEFT_TO_RIGHT or SWT.RIGHT_TO_LEFT.
      Returns:
      the orientation style
      Throws:
      SWTException -
      • ERROR_WIDGET_DISPOSED - if the receiver has been disposed
      • ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver
      Since:
      3.7

    • getParent

      public Decorations getParent()
      Returns the receiver's parent, which must be a Decorations.
      Returns:
      the receiver's parent
      Throws:
      SWTException -
      • ERROR_WIDGET_DISPOSED - if the receiver has been disposed
      • ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver

    • getParentItem

      public MenuItem getParentItem()
      Returns the receiver's parent item, which must be a MenuItem or null when the receiver is a root.
      Returns:
      the receiver's parent item
      Throws:
      SWTException -
      • ERROR_WIDGET_DISPOSED - if the receiver has been disposed
      • ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver

    • getParentMenu

      public Menu getParentMenu()
      Returns the receiver's parent item, which must be a Menu or null when the receiver is a root.
      Returns:
      the receiver's parent item
      Throws:
      SWTException -
      • ERROR_WIDGET_DISPOSED - if the receiver has been disposed
      • ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver

    • getShell

      public Shell getShell()
      Returns the receiver's shell. For all controls other than shells, this simply returns the control's nearest ancestor shell. Shells return themselves, even if they are children of other shells. Returns null if receiver or its ancestor is the application menubar.
      Returns:
      the receiver's shell or null
      Throws:
      SWTException -
      • ERROR_WIDGET_DISPOSED - if the receiver has been disposed
      • ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver
      See Also:

    • getVisible

      public boolean getVisible()
      Returns true if the receiver is visible, and false otherwise.

      If one of the receiver's ancestors is not visible or some other condition makes the receiver not visible, this method may still indicate that it is considered visible even though it may not actually be showing.

      Returns:
      the receiver's visibility state
      Throws:
      SWTException -
      • ERROR_WIDGET_DISPOSED - if the receiver has been disposed
      • ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver

    • indexOf

      public int indexOf(MenuItem item)
      Searches the receiver's list starting at the first item (index 0) until an item is found that is equal to the argument, and returns the index of that item. If no item is found, returns -1.
      Parameters:
      item - the search item
      Returns:
      the index of the item
      Throws:
      IllegalArgumentException -
      • ERROR_NULL_ARGUMENT - if the item is null
      SWTException -
      • ERROR_WIDGET_DISPOSED - if the receiver has been disposed
      • ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver

    • isEnabled

      public boolean isEnabled()
      Returns true if the receiver is enabled and all of the receiver's ancestors are enabled, and false otherwise. A disabled menu is typically not selectable from the user interface and draws with an inactive or "grayed" look.
      Returns:
      the receiver's enabled state
      Throws:
      SWTException -
      • ERROR_WIDGET_DISPOSED - if the receiver has been disposed
      • ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver
      See Also:

    • isVisible

      public boolean isVisible()
      Returns true if the receiver is visible and all of the receiver's ancestors are visible and false otherwise.
      Returns:
      the receiver's visibility state
      Throws:
      SWTException -
      • ERROR_WIDGET_DISPOSED - if the receiver has been disposed
      • ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver
      See Also:

    • removeHelpListener

      public void removeHelpListener(HelpListener listener)
      Removes the listener from the collection of listeners who will be notified when the help events are generated for the control.
      Parameters:
      listener - the listener which should no longer be notified
      Throws:
      IllegalArgumentException -
      • ERROR_NULL_ARGUMENT - if the listener is null
      SWTException -
      • ERROR_WIDGET_DISPOSED - if the receiver has been disposed
      • ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver
      See Also:

    • removeMenuListener

      public void removeMenuListener(MenuListener listener)
      Removes the listener from the collection of listeners who will be notified when the menu events are generated for the control.
      Parameters:
      listener - the listener which should no longer be notified
      Throws:
      IllegalArgumentException -
      • ERROR_NULL_ARGUMENT - if the listener is null
      SWTException -
      • ERROR_WIDGET_DISPOSED - if the receiver has been disposed
      • ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver
      See Also:

    • setDefaultItem

      public void setDefaultItem(MenuItem item)
      Sets the default menu item to the argument or removes the default emphasis when the argument is null.
      Parameters:
      item - the default menu item or null
      Throws:
      IllegalArgumentException -
      • ERROR_INVALID_ARGUMENT - if the menu item has been disposed
      SWTException -
      • ERROR_WIDGET_DISPOSED - if the receiver has been disposed
      • ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver

    • setEnabled

      public void setEnabled(boolean enabled)
      Enables the receiver if the argument is true, and disables it otherwise. A disabled menu is typically not selectable from the user interface and draws with an inactive or "grayed" look.
      Parameters:
      enabled - the new enabled state
      Throws:
      SWTException -
      • ERROR_WIDGET_DISPOSED - if the receiver has been disposed
      • ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver

    • setLocation

      public void setLocation(int x, int y)
      Sets the location of the receiver, which must be a popup, to the point specified by the arguments which are relative to the display.

      Note that this is different from most widgets where the location of the widget is relative to the parent.

      Also note that the actual location of the menu is dependent on platform specific behavior. For example: on Linux with Wayland this operation is a hint due to lack of global coordinates.

      Parameters:
      x - the new x coordinate for the receiver
      y - the new y coordinate for the receiver
      Throws:
      SWTException -
      • ERROR_WIDGET_DISPOSED - if the receiver has been disposed
      • ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver

    • setLocation

      public void setLocation(Point location)
      Sets the location of the receiver, which must be a popup, to the point specified by the argument which is relative to the display.

      Note that this is different from most widgets where the location of the widget is relative to the parent.

      Note that the platform window manager ultimately has control over the location of popup menus.

      Parameters:
      location - the new location for the receiver
      Throws:
      IllegalArgumentException -
      • ERROR_NULL_ARGUMENT - if the point is null
      SWTException -
      • ERROR_WIDGET_DISPOSED - if the receiver has been disposed
      • ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver
      Since:
      2.1

    • setOrientation

      public void setOrientation(int orientation)
      Sets the orientation of the receiver, which must be one of the constants SWT.LEFT_TO_RIGHT or SWT.RIGHT_TO_LEFT.
      Parameters:
      orientation - new orientation style
      Throws:
      SWTException -
      • ERROR_WIDGET_DISPOSED - if the receiver has been disposed
      • ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver
      Since:
      3.7

    • setVisible

      public void setVisible(boolean visible)
      Marks the receiver as visible if the argument is true, and marks it invisible otherwise.

      If one of the receiver's ancestors is not visible or some other condition makes the receiver not visible, marking it visible may not actually cause it to be displayed.

      Parameters:
      visible - the new visibility state
      Throws:
      SWTException -
      • ERROR_WIDGET_DISPOSED - if the receiver has been disposed
      • ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver