hi::v1::scroll_widget< Axis, Name > Class Template Reference

#include <hikogui/widgets/scroll_widget.hpp>

Inheritance diagram for hi::v1::scroll_widget< Axis, Name >:

Public Types
using	super = widget
using	aperture_type = scroll_aperture_widget<prefix>
using	horizontal_bar_type = scroll_bar_widget<axis::horizontal, prefix>
using	vertical_bar_type = scroll_bar_widget<axis::vertical, prefix>
Public Types inherited from hi::v1::widget
using	callback_token = notifier<void()>::callback_token
using	awaiter_type = notifier<void()>::awaiter_type

Public Member Functions
	scroll_widget (widget *parent) noexcept
	Constructs an empty scroll widget.
template<typename Widget , typename... Args>
Widget &	make_widget (Args &&...args) noexcept
	Add a content widget directly to this scroll widget.
Public Member Functions inherited from hi::v1::widget
	widget (widget *parent) noexcept
	widget (widget const &)=delete
	widget (widget &&)=delete
widget &	operator= (widget &&)=delete
widget &	operator= (widget const &)=delete
generator< widget & >	children (bool include_invisible) noexcept
virtual hitbox	hitbox_test_from_parent (point2i position) const noexcept
	Call hitbox_test from a parent widget.
virtual hitbox	hitbox_test_from_parent (point2i position, hitbox sibling_hitbox) const noexcept
	Call hitbox_test from a parent widget.
virtual bool	accepts_keyboard_focus (keyboard_focus_group group) const noexcept
	Check if the widget will accept keyboard focus.
void	reset_layout (gui_window *new_window, gfx_surface *new_surface, float new_scale) noexcept
	Reset the layout.
virtual sub_theme_selector_type	sub_theme_selector () const noexcept
virtual bool	process_event (gui_event const &event) const noexcept
virtual void	request_redraw () const noexcept
	Request the widget to be redrawn on the next frame.
virtual bool	handle_event (gui_event const &event) noexcept
	Handle command.
virtual bool	handle_event_recursive (gui_event const &event, std::vector< widget_id > const &reject_list=std::vector< widget_id >{}) noexcept
	Handle command recursive.
virtual widget_id	find_next_widget (widget_id current_keyboard_widget, keyboard_focus_group group, keyboard_focus_direction direction) const noexcept
	Find the next widget that handles keyboard focus.
widget_id	find_first_widget (keyboard_focus_group group) const noexcept
widget_id	find_last_widget (keyboard_focus_group group) const noexcept
bool	is_first (keyboard_focus_group group) const noexcept
bool	is_last (keyboard_focus_group group) const noexcept
virtual void	scroll_to_show (hi::aarectanglei rectangle) noexcept
	Scroll to show the given rectangle on the window.
std::vector< widget_id >	parent_chain () const noexcept
	Get a list of parents of a given widget.
virtual bool	is_tab_button () const noexcept
	Check if this widget is a tab-button.
template<forward_of< void()> Callback>
callback_token	subscribe (Callback &&callback, callback_flags flags=callback_flags::synchronous) const noexcept
awaiter_type	operator co_await () const noexcept

Static Public Attributes
static constexpr auto	prefix = Name / "scroll"
static constexpr hi::axis	axis = Axis

Additional Inherited Members
Data Fields inherited from hi::v1::widget
widget_id	id = {}
	The numeric identifier of a widget.
widget *	parent = nullptr
	Pointer to the parent widget.
gui_window *	window = nullptr
	The window this widget is on.
gfx_surface *	surface = nullptr
	The surface this widget is drawn on.
observer< widget_mode >	mode = widget_mode::enabled
	The widget mode.
observer< bool >	hover = false
	Mouse cursor is hovering over the widget.
observer< bool >	clicked = false
	The widget is being clicked by the mouse.
observer< bool >	focus = false
	The widget has keyboard focus.
observer< widget_state >	state = widget_state::off
	The state of the widget.
size_t	semantic_layer = 0_uz
	The draw layer of the widget.
observer< extent2i >	minimum = extent2i{}
	The minimum size this widget is allowed to be.
observer< extent2i >	maximum = extent2i::large()
	The maximum size this widget is allowed to be.
widget_layout	layout

Detailed Description

template<axis Axis = axis::both, fixed_string Name = "">
class hi::v1::scroll_widget< Axis, Name >

The scroll widget allows a content widget to be shown in less space than is required.

The user can then show the part of the content widget by using the scroll-bar widgets which are provided by the scroll widget.

The size of the scroll widget is based on the widget::minimum_size(), widget::preferred_size() and widget::maximum_size() of the content widget together with the space needed for the scrollbars.

In the directions that are allowed for scrolling the minimum size of the scroll widget is adjusted to be much smaller, up to the smallest size of the scroll-bar widget in that direction.

Scroll-bars are automatically added when the actual size of the scroll widget is smaller than the content, this will happen even if the template parameters given did not allow scrolling in that direction. This is useful behavior when the scroll widget is part of an overlay widget which was unable to size to the minimum size requested.

Template Parameters

Axis	the axis that the content may be scrolled. Allowed values are axis::horizontal, axis::vertical or axis::both.

Constructor & Destructor Documentation

scroll_widget()

template<axis Axis = axis::both, fixed_string Name = "">

hi::v1::scroll_widget< Axis, Name >::scroll_widget ( widget * parent )

inlinenoexcept

Constructs an empty scroll widget.

Parameters

parent

The parent widget.

Member Function Documentation

make_widget()

template<axis Axis = axis::both, fixed_string Name = "">

template<typename Widget , typename... Args>

Widget & hi::v1::scroll_widget< Axis, Name >::make_widget ( Args &&... args )

inlinenoexcept

Add a content widget directly to this scroll widget.

This widget is added as the content widget.

Precondition

No content widgets have been added before.

Template Parameters

Widget

The type of the widget to be constructed.

Parameters

args	The arguments passed to the constructor of the widget.

Returns

A reference to the widget that was created.

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

• hikogui/src/hikogui/widgets/scroll_widget.hpp