Abstract base class for the generator. More...

#include <generator.hpp>

Inheritance diagram for gui2::tgenerator_:

Public Types
enum	tplacement { horizontal_list, vertical_list, grid, independent }
	Determines how the items are placed. More...

typedef std::function< bool(unsigned, unsigned)>	torder_func

Public Types inherited from gui2::event::tdispatcher
enum	tevent_type { pre = 1, child = 2, post = 4 }

enum	tposition { front_pre_child, back_pre_child, front_child, back_child, front_post_child, back_post_child }
	The position where to add a new callback in the signal handler. More...

enum	tmouse_behavior { all, hit, none }
	The behavior of the mouse events. More...

Public Member Functions
virtual	~tgenerator_ ()

virtual void	delete_item (const unsigned index)=0
	Deletes an item. More...

virtual void	clear ()=0
	Deletes all items. More...

virtual void	select_item (const unsigned index, const bool select)=0
	(De)selects an item. More...

void	toggle_item (const unsigned index)
	Toggles the selection state of an item. More...

virtual bool	is_selected (const unsigned index) const =0
	Returns whether the item is selected. More...

virtual void	set_item_shown (const unsigned index, const bool show)=0
	Shows or hides an item. More...

virtual bool	get_item_shown (const unsigned index) const =0
	Returns whether the item is shown. More...

virtual unsigned	get_item_count () const =0
	Returns the number of items. More...

virtual unsigned	get_selected_item_count () const =0
	Returns the number of selected items. More...

virtual int	get_selected_item () const =0
	Returns the selected item. More...

virtual tgrid &	item (const unsigned index)=0
	Gets the grid of an item. More...

virtual const tgrid &	item (const unsigned index) const =0
	Gets the grid of an item. More...

virtual tgrid &	create_item (const int index, tbuilder_grid_const_ptr list_builder, const string_map &item_data, const std::function< void(twidget &)> &callback)=0
	Creates a new item. More...

virtual tgrid &	create_item (const int index, tbuilder_grid_const_ptr list_builder, const std::map< std::string, string_map > &data, const std::function< void(twidget &)> &callback)=0
	Creates a new item. More...

virtual void	create_items (const int index, tbuilder_grid_const_ptr list_builder, const std::vector< string_map > &data, const std::function< void(twidget &)> &callback)=0
	Creates one or more new item(s). More...

virtual void	create_items (const int index, tbuilder_grid_const_ptr list_builder, const std::vector< std::map< std::string, string_map > > &data, const std::function< void(twidget &)> &callback)=0
	Creates one or more new item(s). More...

virtual void	set_order (const torder_func &order)=0

virtual void	layout_initialise (const bool full_initialisation) override=0
	See twidget::layout_initialise. More...

virtual void	request_reduce_width (const unsigned maximum_width) override=0
	See twidget::request_reduce_width. More...

virtual void	request_reduce_height (const unsigned maximum_height) override=0
	See twidget::request_reduce_height. More...

virtual tpoint	calculate_best_size () const override=0
	See twidget::calculate_best_size. More...

virtual void	place (const tpoint &origin, const tpoint &size) override=0
	See twidget::place. More...

virtual void	set_origin (const tpoint &origin) override=0
	See twidget::set_origin. More...

virtual void	set_visible_rectangle (const SDL_Rect &rectangle) override=0
	See twidget::set_visible_rectangle. More...

virtual void	impl_draw_children (surface &frame_buffer, int x_offset, int y_offset) override=0
	See twidget::impl_draw_children. More...

virtual twidget *	find_at (const tpoint &coordinate, const bool must_be_active) override=0
	See twidget::find_at. More...

virtual const twidget *	find_at (const tpoint &coordinate, const bool must_be_active) const override=0
	See twidget::find_at. More...

virtual void	handle_key_up_arrow (SDLMod modifier, bool &handled)=0
	Up arrow key pressed. More...

virtual void	handle_key_down_arrow (SDLMod modifier, bool &handled)=0
	Down arrow key pressed. More...

virtual void	handle_key_left_arrow (SDLMod modifier, bool &handled)=0
	Left arrow key pressed. More...

virtual void	handle_key_right_arrow (SDLMod modifier, bool &handled)=0
	Right arrow key pressed. More...

Public Member Functions inherited from gui2::twidget
	twidget ()

	twidget (const tbuilder_widget &builder)
	Constructor. More...

virtual	~twidget () override

void	set_id (const std::string &id)

const std::string &	id () const

twindow *	get_window ()
	Get the parent window. More...

const twindow *	get_window () const
	The constant version of get_window. More...

tdialog *	dialog ()
	Returns the top-level dialogue. More...

void	set_parent (twidget *parent)

twidget *	parent ()

virtual void	demand_reduce_width (const unsigned maximum_width)
	Tries to reduce the width of a widget. More...

virtual void	demand_reduce_height (const unsigned maximum_height)
	Tries to reduce the height of a widget. More...

tpoint	get_best_size () const
	Gets the best size for the widget. More...

virtual bool	can_mouse_focus () const
	Whether the mouse move/click event go 'through' this widget. More...

virtual bool	can_wrap () const
	Can the widget wrap. More...

virtual void	set_size (const tpoint &size)
	Sets the size of the widget. More...

virtual void	move (const int x_offset, const int y_offset)
	Moves a widget. More...

virtual void	layout_children ()
	Allows a widget to update its children. More...

tpoint	get_origin () const
	Returns the screen origin of the widget. More...

tpoint	get_size () const
	Returns the size of the widget. More...

SDL_Rect	get_rectangle () const
	Gets the bounding rectangle of the widget on the screen. More...

int	get_x () const

int	get_y () const

unsigned	get_width () const

unsigned	get_height () const

void	set_linked_group (const std::string &linked_group)

SDL_Rect	calculate_blitting_rectangle (const int x_offset, const int y_offset)
	Calculates the blitting rectangle of the widget. More...

SDL_Rect	calculate_clipping_rectangle (const int x_offset, const int y_offset)
	Calculates the clipping rectangle of the widget. More...

void	draw_background (surface &frame_buffer, int x_offset, int y_offset)
	Draws the background of a widget. More...

void	draw_children (surface &frame_buffer, int x_offset, int y_offset)
	Draws the children of a widget. More...

void	draw_foreground (surface &frame_buffer, int x_offset, int y_offset)
	Draws the foreground of the widget. More...

void	populate_dirty_list (twindow &caller, std::vector< twidget * > &call_stack)
	Adds a widget to the dirty list if it is dirty. More...

SDL_Rect	get_dirty_rectangle () const
	Gets the dirty rectangle of the widget. More...

void	set_is_dirty (const bool is_dirty)

bool	get_is_dirty () const

void	set_visible (const tvisible::scoped_enum visible)

tvisible::scoped_enum	get_visible () const

tredraw_action::scoped_enum	get_drawing_action () const

void	set_debug_border_mode (const unsigned debug_border_mode)

void	set_debug_border_colour (const unsigned debug_border_colour)

virtual twidget *	find (const std::string &id, const bool must_be_active)
	Returns a widget with the wanted id. More...

virtual const twidget *	find (const std::string &id, const bool must_be_active) const
	The constant version of find. More...

virtual bool	has_widget (const twidget &widget) const
	Does the widget contain the widget. More...

virtual bool	disable_click_dismiss () const =0
	Does the widget disable easy close? More...

virtual iterator::twalker_ *	create_walker ()=0
	Creates a new walker object on the heap. More...

Public Member Functions inherited from gui2::tevent_executor
	tevent_executor ()

virtual	~tevent_executor ()

void	set_wants_mouse_hover (const bool hover=true)

bool	wants_mouse_hover () const

void	set_wants_mouse_left_double_click (const bool click=true)

bool	wants_mouse_left_double_click () const

void	set_wants_mouse_middle_double_click (const bool click=true)

bool	wants_mouse_middle_double_click () const

tevent_executor &	set_wants_mouse_right_double_click (const bool click=true)

bool	wants_mouse_right_double_click () const

Public Member Functions inherited from gui2::event::tdispatcher
	tdispatcher ()

virtual	~tdispatcher ()

void	connect ()
	Connects the dispatcher to the event handler. More...

bool	has_event (const tevent event, const tevent_type event_type)

bool	fire (const tevent event, twidget &target)
	Fires an event which has no extra parameters. More...

bool	fire (const tevent event, twidget &target, const tpoint &coordinate)
	Fires an event which takes a coordinate parameter. More...

bool	fire (const tevent event, twidget &target, const SDLKey key, const SDLMod modifier, const utf8::string &unicode)
	Fires an event which takes keyboard parameters. More...

bool	fire (const tevent event, twidget &target, void *)
	Fires an event which takes notification parameters. More...

bool	fire (const tevent event, twidget &target, tmessage &message)
	Fires an event which takes message parameters. More...

template<tevent E>
boost::enable_if < boost::mpl::has_key < tset_event, boost::mpl::int_ < E > > >::type	connect_signal (const tsignal_function &signal, const tposition position=back_child)
	Connect a signal for callback in tset_event. More...

template<tevent E>
boost::enable_if < boost::mpl::has_key < tset_event, boost::mpl::int_ < E > > >::type	disconnect_signal (const tsignal_function &signal, const tposition position=back_child)
	Disconnect a signal for callback in tset_event. More...

template<tevent E>
boost::enable_if < boost::mpl::has_key < tset_event_mouse, boost::mpl::int_< E > > >::type	connect_signal (const tsignal_mouse_function &signal, const tposition position=back_child)
	Connect a signal for callback in tset_event_mouse. More...

template<tevent E>
boost::enable_if < boost::mpl::has_key < tset_event_mouse, boost::mpl::int_< E > > >::type	disconnect_signal (const tsignal_mouse_function &signal, const tposition position=back_child)
	Disconnect a signal for callback in tset_event_mouse. More...

template<tevent E>
boost::enable_if < boost::mpl::has_key < tset_event_keyboard, boost::mpl::int_< E > > >::type	connect_signal (const tsignal_keyboard_function &signal, const tposition position=back_child)
	Connect a signal for callback in tset_event_keyboard. More...

template<tevent E>
boost::enable_if < boost::mpl::has_key < tset_event_keyboard, boost::mpl::int_< E > > >::type	disconnect_signal (const tsignal_keyboard_function &signal, const tposition position=back_child)
	Disconnect a signal for callback in tset_event_keyboard. More...

template<tevent E>
boost::enable_if < boost::mpl::has_key < tset_event_notification, boost::mpl::int_< E > > >::type	connect_signal (const tsignal_notification_function &signal, const tposition position=back_child)
	Connect a signal for callback in tset_event_notification. More...

template<tevent E>
boost::enable_if < boost::mpl::has_key < tset_event_notification, boost::mpl::int_< E > > >::type	disconnect_signal (const tsignal_notification_function &signal, const tposition position=back_child)
	Disconnect a signal for callback in tset_event_notification. More...

template<tevent E>
boost::enable_if < boost::mpl::has_key < tset_event_message, boost::mpl::int_< E > > >::type	connect_signal (const tsignal_message_function &signal, const tposition position=back_child)
	Connect a signal for callback in tset_event_message. More...

template<tevent E>
boost::enable_if < boost::mpl::has_key < tset_event_message, boost::mpl::int_< E > > >::type	disconnect_signal (const tsignal_message_function &signal, const tposition position=back_child)
	Disconnect a signal for callback in tset_event_message. More...

void	capture_mouse ()
	Captures the mouse. More...

void	release_mouse ()
	Releases the mouse capture. More...

void	set_mouse_behavior (const tmouse_behavior mouse_behavior)

tmouse_behavior	get_mouse_behavior () const

void	set_want_keyboard_input (const bool want_keyboard_input)

bool	get_want_keyboard_input () const

void	register_hotkey (const hotkey::HOTKEY_COMMAND id, const thotkey_function &function)
	Registers a hotkey. More...

bool	execute_hotkey (const hotkey::HOTKEY_COMMAND id)
	Executes a hotkey. More...

Static Public Member Functions
static tgenerator_ *	build (const bool has_minimum, const bool has_maximum, const tplacement placement, const bool select)
	Create a new generator. More...

Protected Member Functions
virtual void	child_populate_dirty_list (twindow &caller, const std::vector< twidget * > &call_stack) override=0
	See twidget::child_populate_dirty_list. More...

virtual void	do_select_item (const unsigned index)=0
	Selects a not selected item. More...

virtual void	do_deselect_item (const unsigned index)=0
	Deselects a selected item. More...

virtual tgrid &	item_ordered (const unsigned index)=0
	Gets the grid of an item. More...

virtual const tgrid &	item_ordered (const unsigned index) const =0
	Gets the grid of an item. More...

virtual unsigned	get_ordered_index (unsigned index) const =0

virtual unsigned	get_item_at_ordered (unsigned index_ordered) const =0

Protected Member Functions inherited from gui2::twidget
void	set_layout_size (const tpoint &size)

const tpoint &	layout_size () const

Friends
class	tdebug_layout_graph

Detailed Description

Abstract base class for the generator.

A generator is a class which holds multiple grids and controls their placement on the screen. The final class is policy based, more info about the possible policies is documented in the build() function. This function is the factory to generate the classes as well.

Definition at line 41 of file generator.hpp.

Member Typedef Documentation

typedef std::function<bool (unsigned, unsigned)> gui2::tgenerator_::torder_func

Definition at line 239 of file generator.hpp.

Member Enumeration Documentation

enum gui2::tgenerator_::tplacement

Determines how the items are placed.

Enumerator
horizontal_list
vertical_list
grid
independent

Definition at line 51 of file generator.hpp.

Constructor & Destructor Documentation

virtual gui2::tgenerator_::~tgenerator_ ( )

inlinevirtual

Definition at line 46 of file generator.hpp.

Member Function Documentation

tgenerator_ * gui2::tgenerator_::build	(	const bool	has_minimum,
		const bool	has_maximum,
		const tplacement	placement,
		const bool	select
	)

static

Create a new generator.

Parameters

has_minimum	Does one item need to be selected.
has_maximum	Is one the maximum number of items that can be selected?
placement	The placement of the grids, see tplacement for more info.
select	If a grid is selected, what should happen? If true the grid is selected, if false the grid is shown.

Returns: A pointer to a new object. The caller gets ownership of the new object.

Definition at line 802 of file generator.cpp.

References GENERATE_BODY.

virtual tpoint gui2::tgenerator_::calculate_best_size ( ) const

overridepure virtual

See twidget::calculate_best_size.

Implements gui2::twidget.

Implemented in gui2::policy::placement::tindependent, gui2::policy::placement::tmatrix, gui2::policy::placement::tvertical_list, and gui2::policy::placement::thorizontal_list.

Referenced by gui2::tlistbox::set_row_shown().

virtual void gui2::tgenerator_::child_populate_dirty_list	(	twindow &	caller,
		const std::vector< twidget * > &	call_stack
	)

overrideprotectedpure virtual

See twidget::child_populate_dirty_list.

Reimplemented from gui2::twidget.

virtual void gui2::tgenerator_::clear ( )

pure virtual

Deletes all items.

Referenced by gui2::tmulti_page::clear().

virtual tgrid& gui2::tgenerator_::create_item	(	const int	index,
		tbuilder_grid_const_ptr	list_builder,
		const string_map &	item_data,
		const std::function< void(twidget &)> &	callback
	)

pure virtual

Creates a new item.

The item_data is used for the first widget found, this normally should be used when there's one widget in an item.

Parameters

index	The item before which to add the new item, 0 == begin, -1 == end.
list_builder	A grid builder that's will build the contents of the new item.
item_data	The data to initialize the parameters of the new item.
callback	The callback function to call when an item in the grid is (de)selected.

Returns: A reference to the newly created grid.

Referenced by gui2::tmulti_page::add_page(), gui2::tlistbox::add_row(), and gui2::tstacked_widget::finalize().

virtual tgrid& gui2::tgenerator_::create_item	(	const int	index,
		tbuilder_grid_const_ptr	list_builder,
		const std::map< std::string, string_map > &	data,
		const std::function< void(twidget &)> &	callback
	)

pure virtual

Creates a new item.

The item_data is used by id, and is meant to set multiple widgets in an item.

Parameters

index	The item before which to add the new item, 0 == begin, -1 == end.
list_builder	A grid builder that's will build the contents of the new item.
data	The data to initialize the parameters of the new item.
callback	The callback function to call when an item in the grid is (de)selected.

Returns: A reference to the newly created grid.

virtual void gui2::tgenerator_::create_items	(	const int	index,
		tbuilder_grid_const_ptr	list_builder,
		const std::vector< string_map > &	data,
		const std::function< void(twidget &)> &	callback
	)

pure virtual

Creates one or more new item(s).

For every item in item_data a new item is generated. This version expects one widget per item.

Parameters

index	The item before which to add the new item, 0 == begin, -1 == end.
list_builder	A grid builder that's will build the contents of the new item.
data	The data to initialize the parameters of the new item.
callback	The callback function to call when an item in the grid is (de)selected.

Referenced by gui2::tmulti_page::finalize(), and gui2::tlistbox::finalize().

virtual void gui2::tgenerator_::create_items	(	const int	index,
		tbuilder_grid_const_ptr	list_builder,
		const std::vector< std::map< std::string, string_map > > &	data,
		const std::function< void(twidget &)> &	callback
	)

pure virtual

Creates one or more new item(s).

For every item in item_data a new item is generated. This version expects multiple widgets per item.

Parameters

index	The item before which to add the new item, 0 == begin, -1 == end.
list_builder	A grid builder that's will build the contents of the new item.
data	The data to initialize the parameters of the new item.
callback	The callback function to call when an item in the grid is (de)selected.

virtual void gui2::tgenerator_::delete_item ( const unsigned index )

pure virtual

Deletes an item.

Implemented in gui2::policy::minimum_selection::tnone, and gui2::policy::minimum_selection::tone.

Referenced by gui2::tmulti_page::remove_page(), and gui2::tlistbox::remove_row().

virtual void gui2::tgenerator_::do_deselect_item ( const unsigned index )

protectedpure virtual

Deselects a selected item.

Parameters

index The index of a selected item.

Referenced by gui2::policy::minimum_selection::tone::delete_item(), gui2::policy::minimum_selection::tnone::delete_item(), gui2::policy::minimum_selection::tone::deselect_item(), gui2::policy::minimum_selection::tnone::deselect_item(), gui2::policy::maximum_selection::tone::select_item(), gui2::policy::minimum_selection::tone::set_item_shown(), and gui2::policy::minimum_selection::tnone::set_item_shown().

virtual void gui2::tgenerator_::do_select_item ( const unsigned index )

protectedpure virtual

Selects a not selected item.

Parameters

index The index of a not selected item.

Referenced by gui2::policy::minimum_selection::tone::create_item(), gui2::policy::minimum_selection::tone::delete_item(), gui2::policy::maximum_selection::tone::select_item(), gui2::policy::maximum_selection::tinfinite::select_item(), and gui2::policy::minimum_selection::tone::set_item_shown().

virtual twidget* gui2::tgenerator_::find_at	(	const tpoint &	coordinate,
		const bool	must_be_active
	)

overridepure virtual

See twidget::find_at.

Reimplemented from gui2::twidget.

Implemented in gui2::policy::placement::tindependent, gui2::policy::placement::tmatrix, gui2::policy::placement::tvertical_list, and gui2::policy::placement::thorizontal_list.

virtual const twidget* gui2::tgenerator_::find_at	(	const tpoint &	coordinate,
		const bool	must_be_active
	)		const

overridepure virtual

See twidget::find_at.

Reimplemented from gui2::twidget.

Implemented in gui2::policy::placement::tindependent, gui2::policy::placement::tmatrix, gui2::policy::placement::tvertical_list, and gui2::policy::placement::thorizontal_list.

virtual unsigned gui2::tgenerator_::get_item_at_ordered ( unsigned index_ordered ) const

protectedpure virtual

Referenced by gui2::policy::minimum_selection::tone::delete_item(), gui2::policy::placement::tvertical_list::handle_key_down_arrow(), gui2::policy::placement::thorizontal_list::handle_key_left_arrow(), gui2::policy::placement::thorizontal_list::handle_key_right_arrow(), gui2::policy::placement::tvertical_list::handle_key_up_arrow(), gui2::policy::placement::thorizontal_list::place(), gui2::policy::placement::tvertical_list::place(), gui2::policy::placement::thorizontal_list::set_origin(), and gui2::policy::placement::tvertical_list::set_origin().

virtual unsigned gui2::tgenerator_::get_item_count ( ) const

pure virtual

Returns the number of items.

virtual bool gui2::tgenerator_::get_item_shown ( const unsigned index ) const

pure virtual

Returns whether the item is shown.

virtual unsigned gui2::tgenerator_::get_ordered_index ( unsigned index ) const

protectedpure virtual

Referenced by gui2::policy::minimum_selection::tone::delete_item(), gui2::policy::placement::tvertical_list::handle_key_down_arrow(), gui2::policy::placement::thorizontal_list::handle_key_left_arrow(), gui2::policy::placement::thorizontal_list::handle_key_right_arrow(), and gui2::policy::placement::tvertical_list::handle_key_up_arrow().

virtual int gui2::tgenerator_::get_selected_item ( ) const

pure virtual

Returns the selected item.

If a list has multiple selected items it looks whether it knows the last item actually selected, if that item is selected that one is chosen. Else is goes through all selected items and returns the first one selected.

Note: tstacked_widget depends on that behavior it always has all items selected and thus shown and by default the last selected item (the top one) is active.

Returns: The selected item, -1 if none selected.

Referenced by gui2::policy::placement::tindependent::find_at(), gui2::tmulti_page::get_selected_page(), gui2::tlistbox::get_selected_row(), gui2::tlistbox::handle_key_down_arrow(), gui2::policy::placement::tvertical_list::handle_key_down_arrow(), gui2::policy::placement::thorizontal_list::handle_key_left_arrow(), gui2::tlistbox::handle_key_left_arrow(), gui2::policy::placement::thorizontal_list::handle_key_right_arrow(), gui2::tlistbox::handle_key_right_arrow(), gui2::tlistbox::handle_key_up_arrow(), gui2::policy::placement::tvertical_list::handle_key_up_arrow(), gui2::tlistbox::place(), and gui2::policy::maximum_selection::tone::select_item().

virtual unsigned gui2::tgenerator_::get_selected_item_count ( ) const

pure virtual

Returns the number of selected items.

Referenced by gui2::policy::minimum_selection::tone::create_item(), gui2::policy::minimum_selection::tone::delete_item(), gui2::policy::minimum_selection::tone::deselect_item(), gui2::policy::placement::tvertical_list::handle_key_down_arrow(), gui2::policy::placement::thorizontal_list::handle_key_left_arrow(), gui2::policy::placement::thorizontal_list::handle_key_right_arrow(), gui2::policy::placement::tvertical_list::handle_key_up_arrow(), gui2::policy::maximum_selection::tone::select_item(), and gui2::policy::minimum_selection::tone::set_item_shown().

virtual void gui2::tgenerator_::handle_key_down_arrow	(	SDLMod	modifier,
		bool &	handled
	)

pure virtual

Down arrow key pressed.

Parameters

modifier	The SDL keyboard modifier when the key was pressed.
handled	If the function handles the key it should set handled to true else do not modify it. This is used in the keyboard event changing.

Implemented in gui2::policy::placement::tindependent, gui2::policy::placement::tmatrix, gui2::policy::placement::tvertical_list, and gui2::policy::placement::thorizontal_list.

Referenced by gui2::tlistbox::handle_key_down_arrow().

virtual void gui2::tgenerator_::handle_key_left_arrow	(	SDLMod	modifier,
		bool &	handled
	)

pure virtual

Left arrow key pressed.

Parameters

modifier	The SDL keyboard modifier when the key was pressed.
handled	If the function handles the key it should set handled to true else do not modify it. This is used in the keyboard event changing.

Implemented in gui2::policy::placement::tindependent, gui2::policy::placement::tmatrix, gui2::policy::placement::tvertical_list, and gui2::policy::placement::thorizontal_list.

Referenced by gui2::tlistbox::handle_key_left_arrow().

virtual void gui2::tgenerator_::handle_key_right_arrow	(	SDLMod	modifier,
		bool &	handled
	)

pure virtual

Right arrow key pressed.

Parameters

modifier	The SDL keyboard modifier when the key was pressed.
handled	If the function handles the key it should set handled to true else do not modify it. This is used in the keyboard event changing.

Implemented in gui2::policy::placement::tindependent, gui2::policy::placement::tmatrix, gui2::policy::placement::tvertical_list, and gui2::policy::placement::thorizontal_list.

Referenced by gui2::tlistbox::handle_key_right_arrow().

virtual void gui2::tgenerator_::handle_key_up_arrow	(	SDLMod	modifier,
		bool &	handled
	)

pure virtual

Up arrow key pressed.

Parameters

modifier	The SDL keyboard modifier when the key was pressed.
handled	If the function handles the key it should set handled to true else do not modify it. This is used in the keyboard event changing.

Implemented in gui2::policy::placement::tindependent, gui2::policy::placement::tmatrix, gui2::policy::placement::tvertical_list, and gui2::policy::placement::thorizontal_list.

Referenced by gui2::tlistbox::handle_key_up_arrow().