Menu Class Reference

#include <ImFusion/GUI/Menu.h>

Represents a hierarchical menu of actions used to describe menu bars, context menus, or popup menus. More...

Detailed Description

Represents a hierarchical menu of actions used to describe menu bars, context menus, or popup menus.

This class does not implement any rendering or other visual representation of the underlying menu but serves only as GUI library-agnostic interface to describe the appearance and behavior of it.

A menu is formed by a list of items, where each item is either a clickable action, a divider separating groups of related actions, or a recursive submenu of the same form.

Example:

Menu m;
m.addAction("Reset", [this]() { reset(); }, "Reset to default settings");
m.addToggleAction("Show details", showsDetails(); [this]() { setShowDetails(!showsDetails()); });
m.addSeparator();
{
    Menu submenu("Extras", "Advanced options");
    submenu.addAction(...);
    m.addSubmenu(std::move(submenu));
}

Warning

Due to the asynchronous nature of context menus make sure to follow the following guidelines on object lifetimes: Action callbacks should only capture references/pointers to objects that have at least the same lifetime as the object that is creating the menu. Receivers of a Menu instance must ensure that the menu does not outlive the lifetime of all objects to which the original ContextMenuEvent was passed to.

Classes
struct	Action
	Represents an item inside a Menu where a callback function is called when user clicks on it. More...
struct	Separator
	Represents a separator to be shown as divider between unrelated groups of actions. More...

Public Types
using	Item = Utils::Variant<Action, Separator, Menu>
	A menu item is either an action, a separator, or a recursive submenu.

Public Member Functions
	Menu (const std::string &title="", const std::string &description="")
	Creates a new menu.
void	addAction (const std::string &title, Action::ActivationCallback activationCallback, const std::string &description="", std::shared_ptr< TypedImage< uint8_t > > icon=nullptr)
	Adds a new regular Action to the end of the list of actions.
void	addToggleAction (const std::string &title, bool checkState, Action::ActivationCallback activationCallback, const std::string &description="", std::shared_ptr< TypedImage< uint8_t > > icon=nullptr)
	Adds a new checkable Action (representing a boolean state that is toggled when clicked) to the end of the list of actions.
void	addRadioAction (const std::string &title, bool checkState, Action::ActivationCallback activationCallback, const std::string &description="", std::shared_ptr< TypedImage< uint8_t > > icon=nullptr)
	Adds a new exclusively checkable Action (representing one of multiple mutually exclusive options) to the end of the list of actions.
void	addSeparator (const std::string &title="", const std::string &description="")
	Adds a new Separator to the end of the list of actions.
void	addSubmenu (Menu &&m)
	Add an existing menu as submenu to the end of the list of actions.
void	insertItem (Item &&item, int position=-1)
	Insert an existing item into the list of actions at the given position.
void	setIcon (std::shared_ptr< TypedImage< uint8_t > > icon)
	Set the optional icon to show next to the entry of this menu when shown as submenu within a parent menu.
void	clearItems ()
	Removes all items from this menu, title and description will remain unchanged.
bool	isEmpty () const
	Returns if this menu does not contains any items.
void	appendMenu (Menu otherMenu)
	Appends all items of otherMenu to the end of this menu's list of items.
const std::string &	title () const
const std::string &	description () const
const std::shared_ptr< TypedImage< uint8_t > > &	icon () const
const std::vector< Item > &	items () const
	Returns the list of items comprising this menu.
std::vector< Item > &	items ()

Constructor & Destructor Documentation

Menu()

Menu ( const std::string & title = "", const std::string & description = "" )

explicit

Creates a new menu.

Parameters

title	Optional text that should be displayed to represent the (sub) menu
description	Optional text that explains (sub) menu, to be shown as tooltip/and or in the status bar

Member Function Documentation

addAction()

void addAction	(	const std::string &	title,
		Action::ActivationCallback	activationCallback,
		const std::string &	description = "",
		std::shared_ptr< TypedImage< uint8_t > >	icon = nullptr )

Adds a new regular Action to the end of the list of actions.

Parameters

title	Text to be displayed on the menu entry.
activationCallback	Callback function to be called when this action was clicked by the user
description	Optional text that explains the menu entry, to be shown as tooltip/and or in the status bar.
icon	Optional icon to show next to the menu entry

addToggleAction()

void addToggleAction	(	const std::string &	title,
		bool	checkState,
		Action::ActivationCallback	activationCallback,
		const std::string &	description = "",
		std::shared_ptr< TypedImage< uint8_t > >	icon = nullptr )

Adds a new checkable Action (representing a boolean state that is toggled when clicked) to the end of the list of actions.

Parameters

title	Text to be displayed on the menu entry.
checkState	Flag if the underlying state is currently checked.
activationCallback	Callback function to be called when this action was clicked by the user
description	Optional text that explains the menu entry, to be shown as tooltip/and or in the status bar.
icon	Optional icon to show next to the menu entry

addRadioAction()

void addRadioAction	(	const std::string &	title,
		bool	checkState,
		Action::ActivationCallback	activationCallback,
		const std::string &	description = "",
		std::shared_ptr< TypedImage< uint8_t > >	icon = nullptr )

Adds a new exclusively checkable Action (representing one of multiple mutually exclusive options) to the end of the list of actions.

A group of exclusive options is formed by the set of adjacent actions of this type where there is no separator in-between.

Parameters

title	Text to be displayed on the menu entry.
checkState	Flag if the underlying option is currently selected.
activationCallback	Callback function to be called when this action was clicked by the user
description	Optional text that explains the menu entry, to be shown as tooltip/and or in the status bar.
icon	Optional icon to show next to the menu entry

addSeparator()

void addSeparator	(	const std::string &	title = "",
		const std::string &	description = "" )

Adds a new Separator to the end of the list of actions.

Parameters

title	Optional text to be shown next to the separator and serving as group header.
description	Optional text that explains the subsequent group, to be shown as tooltip/and or in the status bar.

insertItem()

void insertItem	(	Item &&	item,
		int	position = -1 )

Insert an existing item into the list of actions at the given position.

Will insert to the end if position is negative.

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The documentation for this class was generated from the following file:

• ImFusion/GUI/Menu.h