hi::v1::radio_button_widget Class Reference

#include <hikogui/widgets/radio_button_widget.hpp>

Inheritance diagram for hi::v1::radio_button_widget:

Public Types
using	super = abstract_button_widget
using	delegate_type = typename super::delegate_type
Public Types inherited from hi::v1::abstract_button_widget
using	super = widget
using	delegate_type = button_delegate

Public Member Functions
	radio_button_widget (widget *parent, std::shared_ptr< delegate_type > delegate, button_widget_attribute auto &&...attributes) noexcept
	Construct a radio button widget.
template<different_from< std::shared_ptr< delegate_type > > Value, forward_of< observer< observer_decay_t< Value > > > OnValue, button_widget_attribute... Attributes> requires requires { make_default_radio_button_delegate(hi_forward(value), hi_forward(on_value)); }
	radio_button_widget (widget *parent, Value &&value, OnValue &&on_value, Attributes &&...attributes) noexcept
	Construct a radio button widget with a default button delegate.
Public Member Functions inherited from hi::v1::abstract_button_widget
	abstract_button_widget (widget *parent, std::shared_ptr< delegate_type > delegate) noexcept
button_state	state () const noexcept
	Get the current state of the button.
Public Member Functions inherited from hi::v1::widget
	widget (widget *parent) noexcept
	widget (const widget &)=delete
widget &	operator= (const widget &)=delete
	widget (widget &&)=delete
widget &	operator= (widget &&)=delete
generator< widget_intf & >	children (bool include_invisible) noexcept override
	Get a list of child widgets.
hitbox	hitbox_test (point2 position) const noexcept override
	Find the widget that is under the mouse cursor.
virtual hitbox	hitbox_test_from_parent (point2 position) const noexcept
	Call hitbox_test from a parent widget.
virtual hitbox	hitbox_test_from_parent (point2 position, hitbox sibling_hitbox) const noexcept
	Call hitbox_test from a parent widget.
bool	accepts_keyboard_focus (keyboard_focus_group group) const noexcept override
	Check if the widget will accept keyboard focus.
box_constraints	update_constraints () noexcept override
	Update the constraints of the widget.
void	set_layout (widget_layout const &context) noexcept override
	Update the internal layout of the widget.
widget_layout const &	layout () const noexcept override
	Get the current layout for this widget.
void	draw (draw_context const &context) noexcept override
	Draw the widget.
bool	process_event (gui_event const &event) const noexcept override
	Send a event to the window.
void	request_redraw () const noexcept override
	Request the widget to be redrawn on the next frame.
bool	handle_event (gui_event const &event) noexcept override
	Handle command.
bool	handle_event_recursive (gui_event const &event, std::vector< widget_id > const &reject_list=std::vector< widget_id >{}) noexcept override
	Handle command recursive.
virtual widget_id	find_next_widget (widget_id current_keyboard_widget, keyboard_focus_group group, keyboard_focus_direction direction) const noexcept override
	Find the next widget that handles keyboard focus.
widget_id	find_first_widget (keyboard_focus_group group) const noexcept override
widget_id	find_last_widget (keyboard_focus_group group) const noexcept override
bool	is_first (keyboard_focus_group group) const noexcept
	Is this widget the first widget in the parent container.
bool	is_last (keyboard_focus_group group) const noexcept
	Is this widget the last widget in the parent container.
void	scroll_to_show (hi::aarectangle rectangle) noexcept override
	Scroll to show the given rectangle on the window.
void	set_window (gui_window *window) noexcept override
	Set the window for this tree of widgets.
gui_window *	window () const noexcept override
	Get the window that the widget is owned by.
hi::theme const &	theme () const noexcept
gfx_surface const *	surface () const noexcept
virtual color	foreground_color () const noexcept
virtual color	focus_color () const noexcept
virtual color	accent_color () const noexcept
virtual color	label_color () const noexcept
virtual generator< widget_intf & >	children (bool include_invisible) noexcept=0
	Get a list of child widgets.
virtual generator< widget_intf const & >	children (bool include_invisible) const noexcept final
	Get a list of child widgets.
virtual void	scroll_to_show (hi::aarectangle rectangle) noexcept=0
	Scroll to show the given rectangle on the window.
void	scroll_to_show () noexcept
	Scroll to show the important part of the widget.
Public Member Functions inherited from hi::v1::widget_intf
	widget_intf (widget_intf *parent) noexcept
std::vector< widget_id >	parent_chain () const noexcept
	Get a list of parents of a given widget.
void	scroll_to_show () noexcept
	Scroll to show the important part of the widget.

Additional Inherited Members
Data Fields inherited from hi::v1::abstract_button_widget
std::shared_ptr< delegate_type >	delegate
	The delegate that controls the button widget.
observer< label >	on_label = txt("on")
	The label to show when the button is in the 'on' state.
observer< label >	off_label = txt("off")
	The label to show when the button is in the 'off' state.
observer< label >	other_label = txt("other")
	The label to show when the button is in the 'other' state.
observer< alignment >	alignment
	The alignment of the button and on/off/other label.
observer< semantic_text_style >	text_style = semantic_text_style::label
	The text style to button's label.
notifier< void()>	pressed
Data Fields inherited from hi::v1::widget
observer< widget_mode >	mode = widget_mode::enabled
	The widget mode.
observer< bool >	hover = false
	Mouse cursor is hovering over the widget.
observer< bool >	focus = false
	The widget has keyboard focus.
int	semantic_layer = 0
	The draw layer of the widget.
int	logical_layer = 0
	The logical layer of the widget.
observer< extent2 >	minimum = extent2{}
	The minimum size this widget is allowed to be.
observer< extent2 >	maximum = extent2::large()
	The maximum size this widget is allowed to be.
Data Fields inherited from hi::v1::widget_intf
widget_id	id = {}
	The numeric identifier of a widget.
widget_intf *	parent = nullptr
	Pointer to the parent widget.

Detailed Description

A graphical control element that allows the user to choose only one of a predefined set of mutually exclusive options.

A radio-button has two different states with different visual representation:

• on: The radio button shows a solid circle inside it
• other: The radio button shows empty.

Each time a user activates the radio-button it switches its state to 'on'.

A radio button cannot itself switch state to 'other', this state may be caused by external factors. The canonical example is another radio button in a set, which is configured with a different on_value.

In the following example we create three radio button widgets on the window which observes the same value. Each radio button is configured with a different on_value: 1, 2 and 3. Initially the value is 0, and therefor none of the radio buttons is selected when the application is started.

    observer<int> value = 0;
 
    widget->content().make_widget<radio_button_widget>("B1", value, 1, txt("one"));
    widget->content().make_widget<radio_button_widget>("B2", value, 2, txt("two"));
    widget->content().make_widget<radio_button_widget>("B3", value, 3, txt("three"));

Note

Unlike some other GUI toolkits a radio button is a singular widget. Multiple radio buttons may share a delegate or an observer which allows radio buttons to act as a set.

Constructor & Destructor Documentation

radio_button_widget() [1/2]

hi::v1::radio_button_widget::radio_button_widget ( widget * parent, std::shared_ptr< delegate_type > delegate, button_widget_attribute auto &&... attributes )

inlinenoexcept

Construct a radio button widget.

Parameters

parent	The parent widget that owns this radio button widget.
delegate	The delegate to use to manage the state of the radio button.
attributes	Different attributes used to configure the label's on the radio button: a label, alignment or semantic_text_style. If one label is passed it will be shown in all states. If two labels are passed the first label is shown in on-state and the second for off-state.

radio_button_widget() [2/2]

template<different_from< std::shared_ptr< delegate_type > > Value, forward_of< observer< observer_decay_t< Value > > > OnValue, button_widget_attribute... Attributes>
requires requires { make_default_radio_button_delegate(hi_forward(value), hi_forward(on_value)); }

hi::v1::radio_button_widget::radio_button_widget ( widget * parent, Value && value, OnValue && on_value, Attributes &&... attributes )

inlinenoexcept

Construct a radio button widget with a default button delegate.

Parameters

parent	The parent widget that owns this radio button widget.
value	The value or observer value which represents the state of the radio button.
on_value	An optional on-value. This value is used to determine which value yields an 'on' state.
attributes	Different attributes used to configure the label's on the radio button: a label, alignment or semantic_text_style. If one label is passed it will be shown in all states. If two labels are passed the first label is shown in on-state and the second for off-state.

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

• hikogui/src/hikogui/widgets/radio_button_widget.hpp