View Source wxMenu (wx v2.4.3)
A menu is a popup (or pull down) list of items, one of which may be selected before the menu goes away (clicking elsewhere dismisses the menu).
Menus may be used to construct either menu bars or popup menus.
A menu item has an integer ID associated with it which can be used to identify the
selection, or to change the menu item in some way. A menu item with a special identifier wxID_SEPARATOR
is a separator item and doesn't have an associated command but just makes a separator
line appear in the menu.
Note: Please note that wxID_ABOUT and wxID_EXIT are predefined by wxWidgets and have
a special meaning since entries using these IDs will be taken out of the normal menus
under macOS and will be inserted into the system menu (following the appropriate macOS
interface guideline).
Menu items may be either normal items, check items or radio items. Normal items
don't have any special properties while the check items have a boolean flag associated to
them and they show a checkmark in the menu when the flag is set. wxWidgets automatically
toggles the flag value when the item is clicked and its value may be retrieved using
either isChecked/2 method of wxMenu or wxMenuBar itself or by using wxEvent::IsChecked when
you get the menu notification for the item in question.
The radio items are similar to the check items except that all the other items in the same radio group are unchecked when a radio item is checked. The radio group is formed by a contiguous range of radio items, i.e. it starts at the first item of this kind and ends with the first item of a different kind (or the end of the menu). Notice that because the radio groups are defined in terms of the item positions inserting or removing the items in the menu containing the radio items risks to not work correctly.
Allocation strategy
All menus must be created on the heap because all menus attached to a menubar or to
another menu will be deleted by their parent when it is deleted. The only exception to
this rule are the popup menus (i.e. menus used with wxWindow:popupMenu/4) as wxWidgets does not destroy them
to allow reusing the same menu more than once. But the exception applies only to the menus
themselves and not to any submenus of popup menus which are still destroyed by wxWidgets
as usual and so must be heap-allocated.
As the frame menubar is deleted by the frame itself, it means that normally all menus used are deleted automatically.
Event handling
Event handlers for the commands generated by the menu items can be connected directly to
the menu object itself using wxEvtHandler::Bind() (not implemented in wx). If this menu
is a submenu of another one, the events from its items can also be processed in the parent
menu and so on, recursively.
If the menu is part of a menu bar, then events can also be handled in wxMenuBar object.
Finally, menu events can also be handled in the associated window, which is either the wxFrame
associated with the menu bar this menu belongs to or the window for which wxWindow:popupMenu/4 was called for
the popup menus.
See overview_events_bind for how to bind event handlers to the various objects.
See:
This class is derived, and can use functions, from:
wxWidgets docs: wxMenu
Summary
Functions
Adds a menu item object.
Equivalent to append(This, Id, Item, []).
Adds a menu item.
Adds a submenu.
Adds a checkable item to the end of the menu.
Adds a radio item to the end of the menu.
Adds a separator to the end of the menu.
Inserts a break in a menu, causing the next appended item to appear in a new column.
Checks or unchecks the menu item.
Deletes the menu item from the menu.
Deletes the menu item from the menu.
Destroys the object
Enables or disables (greys out) a menu item.
Finds the menu id for a menu item string.
Returns the wxMenuItem given a position in the menu.
Returns the help string associated with a menu item.
Returns a menu item label.
Returns the number of items in the menu.
Returns the title of the menu.
Inserts the given item before the position pos.
Inserts the given item before the position pos.
Inserts the given submenu before the position pos.
Inserts a checkable item at the given position.
Inserts a radio item at the given position.
Inserts a separator at the given position.
Determines whether a menu item is checked.
Determines whether a menu item is enabled.
Constructs a wxMenu object.
Constructs a wxMenu object with a title.
Inserts the given item at position 0, i.e. before all the other existing items.
Inserts the given item at position 0, i.e. before all the other existing items.
Inserts the given submenu at position 0.
Inserts a checkable item at position 0.
Inserts a radio item at position 0.
Inserts a separator at position 0.
Removes the menu item from the menu but doesn't delete the associated C++ object.
Sets an item's help string.
Sets the label of a menu item.
Sets the title of the menu.
Types
-type wxMenu() :: wx:wx_object().
Functions
-spec append(This, MenuItem) -> wxMenuItem:wxMenuItem() when This :: wxMenu(), MenuItem :: wxMenuItem:wxMenuItem().
Adds a menu item object.
This is the most generic variant of append/5 method because it may be used for both items
(including separators) and submenus and because you can also specify various extra
properties of a menu item this way, such as bitmaps and fonts.
Remark: See the remarks for the other append/5 overloads.
See:
-spec append(This, Id, Item) -> wxMenuItem:wxMenuItem() when This :: wxMenu(), Id :: integer(), Item :: unicode:chardata().
Equivalent to append(This, Id, Item, []).
-spec append(This, Id, Item, SubMenu) -> wxMenuItem:wxMenuItem() when This :: wxMenu(), Id :: integer(), Item :: unicode:chardata(), SubMenu :: wxMenu(); (This, Id, Item, [Option]) -> wxMenuItem:wxMenuItem() when This :: wxMenu(), Id :: integer(), Item :: unicode:chardata(), Option :: {help, unicode:chardata()} | {kind, wx:wx_enum()}.
Adds a menu item.
Example: or even better for stock menu items (see wxMenuItem:new/1):
Remark: This command can be used after the menu has been shown, as well as on initial creation of a menu or menubar.
See:
-spec append(This, Id, Item, SubMenu, [Option]) -> wxMenuItem:wxMenuItem() when This :: wxMenu(), Id :: integer(), Item :: unicode:chardata(), SubMenu :: wxMenu(), Option :: {help, unicode:chardata()}.
Adds a submenu.
Deprecated:
This function is deprecated, use AppendSubMenu() (not implemented in wx) instead.
See:
-spec appendCheckItem(This, Id, Item) -> wxMenuItem:wxMenuItem() when This :: wxMenu(), Id :: integer(), Item :: unicode:chardata().
Equivalent to appendCheckItem(This, Id, Item, []).
-spec appendCheckItem(This, Id, Item, [Option]) -> wxMenuItem:wxMenuItem() when This :: wxMenu(), Id :: integer(), Item :: unicode:chardata(), Option :: {help, unicode:chardata()}.
Adds a checkable item to the end of the menu.
See:
-spec appendRadioItem(This, Id, Item) -> wxMenuItem:wxMenuItem() when This :: wxMenu(), Id :: integer(), Item :: unicode:chardata().
Equivalent to appendRadioItem(This, Id, Item, []).
-spec appendRadioItem(This, Id, Item, [Option]) -> wxMenuItem:wxMenuItem() when This :: wxMenu(), Id :: integer(), Item :: unicode:chardata(), Option :: {help, unicode:chardata()}.
Adds a radio item to the end of the menu.
All consequent radio items form a group and when an item in the group is checked, all the others are automatically unchecked.
Note: Radio items are not supported under wxMotif.
See:
-spec appendSeparator(This) -> wxMenuItem:wxMenuItem() when This :: wxMenu().
Adds a separator to the end of the menu.
See:
-spec break(This) -> ok when This :: wxMenu().
Inserts a break in a menu, causing the next appended item to appear in a new column.
This function only actually inserts a break in wxMSW and does nothing under the other platforms.
Checks or unchecks the menu item.
See: isChecked/2
-spec 'Destroy'(This, Id) -> boolean() when This :: wxMenu(), Id :: integer(); (This, Item) -> boolean() when This :: wxMenu(), Item :: wxMenuItem:wxMenuItem().
Deletes the menu item from the menu.
If the item is a submenu, it will be deleted. Use remove/2 if you want to keep the submenu (for
example, to reuse it later).
See:
-spec delete(This, Id) -> boolean() when This :: wxMenu(), Id :: integer(); (This, Item) -> boolean() when This :: wxMenu(), Item :: wxMenuItem:wxMenuItem().
Deletes the menu item from the menu.
If the item is a submenu, it will not be deleted. Use 'Destroy'/2 if you want to delete a submenu.
See:
-spec destroy(This :: wxMenu()) -> ok.
Destroys the object
Enables or disables (greys out) a menu item.
See: isEnabled/2
-spec findItem(This, Id) -> wxMenuItem:wxMenuItem() when This :: wxMenu(), Id :: integer(); (This, ItemString) -> integer() when This :: wxMenu(), ItemString :: unicode:chardata().
Finds the menu id for a menu item string.
Return: Menu item identifier, or wxNOT_FOUND if none is found.
Remark: Any special menu codes are stripped out of source and target strings before matching.
-spec findItemByPosition(This, Position) -> wxMenuItem:wxMenuItem() when This :: wxMenu(), Position :: integer().
Returns the wxMenuItem given a position in the menu.
-spec getHelpString(This, Id) -> unicode:charlist() when This :: wxMenu(), Id :: integer().
Returns the help string associated with a menu item.
Return: The help string, or the empty string if there is no help string or the item was not found.
See:
-spec getLabel(This, Id) -> unicode:charlist() when This :: wxMenu(), Id :: integer().
Returns a menu item label.
Return: The item label, or the empty string if the item was not found.
See: setLabel/3
Returns the number of items in the menu.
-spec getMenuItems(This) -> [wxMenuItem:wxMenuItem()] when This :: wxMenu().
-spec getTitle(This) -> unicode:charlist() when This :: wxMenu().
Returns the title of the menu.
See: setTitle/2
-spec insert(This, Pos, Id) -> wxMenuItem:wxMenuItem() when This :: wxMenu(), Pos :: integer(), Id :: integer(); (This, Pos, MenuItem) -> wxMenuItem:wxMenuItem() when This :: wxMenu(), Pos :: integer(), MenuItem :: wxMenuItem:wxMenuItem().
Inserts the given item before the position pos.
Inserting the item at position getMenuItemCount/1 is the same as appending it.
See:
-spec insert(This, Pos, Id, [Option]) -> wxMenuItem:wxMenuItem() when This :: wxMenu(), Pos :: integer(), Id :: integer(), Option :: {text, unicode:chardata()} | {help, unicode:chardata()} | {kind, wx:wx_enum()}.
Inserts the given item before the position pos.
Inserting the item at position getMenuItemCount/1 is the same as appending it.
See:
-spec insert(This, Pos, Id, Text, Submenu) -> wxMenuItem:wxMenuItem() when This :: wxMenu(), Pos :: integer(), Id :: integer(), Text :: unicode:chardata(), Submenu :: wxMenu().
Equivalent to insert(This, Pos, Id, Text, Submenu, []).
-spec insert(This, Pos, Id, Text, Submenu, [Option]) -> wxMenuItem:wxMenuItem() when This :: wxMenu(), Pos :: integer(), Id :: integer(), Text :: unicode:chardata(), Submenu :: wxMenu(), Option :: {help, unicode:chardata()}.
Inserts the given submenu before the position pos.
text is the text shown in the menu for it and help is the help string shown in the
status bar when the submenu item is selected.
See: prepend/5
-spec insertCheckItem(This, Pos, Id, Item) -> wxMenuItem:wxMenuItem() when This :: wxMenu(), Pos :: integer(), Id :: integer(), Item :: unicode:chardata().
Equivalent to insertCheckItem(This, Pos, Id, Item, []).
-spec insertCheckItem(This, Pos, Id, Item, [Option]) -> wxMenuItem:wxMenuItem() when This :: wxMenu(), Pos :: integer(), Id :: integer(), Item :: unicode:chardata(), Option :: {help, unicode:chardata()}.
Inserts a checkable item at the given position.
See:
-spec insertRadioItem(This, Pos, Id, Item) -> wxMenuItem:wxMenuItem() when This :: wxMenu(), Pos :: integer(), Id :: integer(), Item :: unicode:chardata().
Equivalent to insertRadioItem(This, Pos, Id, Item, []).
-spec insertRadioItem(This, Pos, Id, Item, [Option]) -> wxMenuItem:wxMenuItem() when This :: wxMenu(), Pos :: integer(), Id :: integer(), Item :: unicode:chardata(), Option :: {help, unicode:chardata()}.
Inserts a radio item at the given position.
See:
-spec insertSeparator(This, Pos) -> wxMenuItem:wxMenuItem() when This :: wxMenu(), Pos :: integer().
Inserts a separator at the given position.
See:
Determines whether a menu item is checked.
Return: true if the menu item is checked, false otherwise.
See: check/3
Determines whether a menu item is enabled.
Return: true if the menu item is enabled, false otherwise.
See: enable/3
-spec new() -> wxMenu().
Constructs a wxMenu object.
Constructs a wxMenu object.
-spec new(Title, [Option]) -> wxMenu() when Title :: unicode:chardata(), Option :: {style, integer()}.
Constructs a wxMenu object with a title.
-spec prepend(This, Id) -> wxMenuItem:wxMenuItem() when This :: wxMenu(), Id :: integer(); (This, Item) -> wxMenuItem:wxMenuItem() when This :: wxMenu(), Item :: wxMenuItem:wxMenuItem().
Inserts the given item at position 0, i.e. before all the other existing items.
See:
-spec prepend(This, Id, [Option]) -> wxMenuItem:wxMenuItem() when This :: wxMenu(), Id :: integer(), Option :: {text, unicode:chardata()} | {help, unicode:chardata()} | {kind, wx:wx_enum()}.
Inserts the given item at position 0, i.e. before all the other existing items.
See:
-spec prepend(This, Id, Text, Submenu) -> wxMenuItem:wxMenuItem() when This :: wxMenu(), Id :: integer(), Text :: unicode:chardata(), Submenu :: wxMenu().
Equivalent to prepend(This, Id, Text, Submenu, []).
-spec prepend(This, Id, Text, Submenu, [Option]) -> wxMenuItem:wxMenuItem() when This :: wxMenu(), Id :: integer(), Text :: unicode:chardata(), Submenu :: wxMenu(), Option :: {help, unicode:chardata()}.
Inserts the given submenu at position 0.
See: insert/6
-spec prependCheckItem(This, Id, Item) -> wxMenuItem:wxMenuItem() when This :: wxMenu(), Id :: integer(), Item :: unicode:chardata().
Equivalent to prependCheckItem(This, Id, Item, []).
-spec prependCheckItem(This, Id, Item, [Option]) -> wxMenuItem:wxMenuItem() when This :: wxMenu(), Id :: integer(), Item :: unicode:chardata(), Option :: {help, unicode:chardata()}.
Inserts a checkable item at position 0.
See:
-spec prependRadioItem(This, Id, Item) -> wxMenuItem:wxMenuItem() when This :: wxMenu(), Id :: integer(), Item :: unicode:chardata().
Equivalent to prependRadioItem(This, Id, Item, []).
-spec prependRadioItem(This, Id, Item, [Option]) -> wxMenuItem:wxMenuItem() when This :: wxMenu(), Id :: integer(), Item :: unicode:chardata(), Option :: {help, unicode:chardata()}.
Inserts a radio item at position 0.
See:
-spec prependSeparator(This) -> wxMenuItem:wxMenuItem() when This :: wxMenu().
Inserts a separator at position 0.
See:
-spec remove(This, Id) -> wxMenuItem:wxMenuItem() when This :: wxMenu(), Id :: integer(); (This, Item) -> wxMenuItem:wxMenuItem() when This :: wxMenu(), Item :: wxMenuItem:wxMenuItem().
Removes the menu item from the menu but doesn't delete the associated C++ object.
This allows you to reuse the same item later by adding it back to the menu (especially useful with submenus).
Return: A pointer to the item which was detached from the menu.
-spec setHelpString(This, Id, HelpString) -> ok when This :: wxMenu(), Id :: integer(), HelpString :: unicode:chardata().
Sets an item's help string.
See: getHelpString/2
-spec setLabel(This, Id, Label) -> ok when This :: wxMenu(), Id :: integer(), Label :: unicode:chardata().
Sets the label of a menu item.
See:
-spec setTitle(This, Title) -> ok when This :: wxMenu(), Title :: unicode:chardata().
Sets the title of the menu.
Remark: Notice that you can only call this method directly for the popup menus, to change
the title of a menu that is part of a menu bar you need to use wxMenuBar:setLabelTop/3.
See: getTitle/1