Inheritance diagram for tt::scroll_bar_widget< IsVertical >:

Public Types
using	super = widget

Public Member Functions
template<typename Content , typename Aperture , typename Offset >
	scroll_bar_widget (gui_window &window, std::shared_ptr< abstract_container_widget > parent, Content &&content, Aperture &&aperture, Offset &&offset) noexcept

bool	update_constraints (hires_utc_clock::time_point display_time_point, bool need_reconstrain) noexcept override
	Update the constraints of the widget.

void	update_layout (hires_utc_clock::time_point display_time_point, bool need_layout) noexcept override
	Update the internal layout of the widget.

void	draw (draw_context context, hires_utc_clock::time_point display_time_point) noexcept override
	Draw the widget.

hit_box	hitbox_test (point2 position) const noexcept override
	Find the widget that is under the mouse cursor.

bool	handle_event (mouse_event const &event) noexcept

bool	accepts_keyboard_focus (keyboard_focus_group group) const noexcept override
	Check if the widget will accept keyboard focus.

bool	visible () const noexcept
	Is the scrollbar visible.

color	background_color () const noexcept override

color	foreground_color () const noexcept override

Public Member Functions inherited from tt::widget
	widget (gui_window &window, std::shared_ptr< abstract_container_widget > parent) noexcept

	widget (const widget &)=delete

widget &	operator= (const widget &)=delete

	widget (widget &&)=delete

widget &	operator= (widget &&)=delete

virtual void	init () noexcept
	Should be called right after allocating and constructing a widget.

float	margin () const noexcept
	Get the margin around the Widget.

float	draw_layer () const noexcept
	The first drawing layer of the widget.

int	logical_layer () const noexcept
	The logical layer of the widget.

int	semantic_layer () const noexcept
	The semantic layer of the widget.

ranged_int< 3 >	width_resistance () const noexcept
	Get the resistance in width.

ranged_int< 3 >	height_resistance () const noexcept
	Get the resistance in height.

interval_extent2	preferred_size () const noexcept
	Get the size-range of the widget.

void	set_layout_parameters (geo::transformer auto const &local_to_parent, extent2 size, aarectangle const &clipping_rectangle) noexcept
	Set the location and size of the widget inside the window.

void	set_layout_parameters_from_parent (aarectangle child_rectangle, aarectangle parent_clipping_rectangle, float draw_layer_delta) noexcept

void	set_layout_parameters_from_parent (aarectangle child_rectangle) noexcept

matrix3	parent_to_local () const noexcept

matrix3	local_to_parent () const noexcept

matrix3	window_to_local () const noexcept

matrix3	local_to_window () const noexcept

extent2	size () const noexcept

float	width () const noexcept

float	height () const noexcept

aarectangle	rectangle () const noexcept
	Get the rectangle in local coordinates.

virtual float	base_line () const noexcept
	Return the base-line where the text should be located.

aarectangle	clipping_rectangle () const noexcept

gui_device *	device () const noexcept

virtual color	focus_color () const noexcept

virtual color	accent_color () const noexcept

virtual color	label_color () const noexcept

virtual void	request_redraw () const noexcept

virtual bool	handle_event (command command) noexcept
	Handle command.

virtual bool	handle_event (std::vector< command > const &commands) noexcept

virtual bool	handle_command_recursive (command command, std::vector< std::shared_ptr< widget > > const &reject_list) noexcept
	Handle command recursive.

virtual bool	handle_event (keyboard_event const &event) noexcept
	Handle keyboard event.

virtual std::shared_ptr< widget >	find_next_widget (std::shared_ptr< widget > const &current_keyboard_widget, keyboard_focus_group group, keyboard_focus_direction direction) const noexcept
	Find the next widget that handles keyboard focus.

std::shared_ptr< abstract_container_widget const >	shared_parent () const noexcept
	Get a shared_ptr to the parent.

std::shared_ptr< abstract_container_widget >	shared_parent () noexcept
	Get a shared_ptr to the parent.

abstract_container_widget const &	parent () const noexcept
	Get a reference to the parent.

abstract_container_widget &	parent () noexcept
	Get a reference to the parent.

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.

Public Member Functions inherited from std::enable_shared_from_this< widget >
T	enable_shared_from_this (T... args)

T	operator= (T... args)

T	shared_from_this (T... args)

T	~enable_shared_from_this (T... args)

Static Public Attributes
static constexpr bool	is_vertical = IsVertical

Additional Inherited Members
Static Public Member Functions inherited from tt::widget
static std::vector< std::shared_ptr< widget > >	parent_chain (std::shared_ptr< tt::widget > const &child_widget) noexcept
	Get a list of parents of a given widget.

Data Fields inherited from tt::widget
gui_window &	window
	Convenient reference to the Window.

observable< bool >	enabled = true
	The widget is enabled.

Member Function Documentation

◆ accepts_keyboard_focus()

template<bool IsVertical>

bool tt::scroll_bar_widget< IsVertical >::accepts_keyboard_focus ( keyboard_focus_group group ) const

inlineoverridevirtualnoexcept

Check if the widget will accept keyboard focus.

Precondition: mutex must be locked by current thread.

Reimplemented from tt::widget.

◆ background_color()

template<bool IsVertical>

color tt::scroll_bar_widget< IsVertical >::background_color ( ) const

inlineoverridevirtualnoexcept

Reimplemented from tt::widget.

◆ draw()

template<bool IsVertical>

void tt::scroll_bar_widget< IsVertical >::draw	(	draw_context	context,
		hires_utc_clock::time_point	display_time_point )

inlineoverridevirtualnoexcept

Draw the widget.

This function is called by the window (optionally) on every frame. It should recursively call this function on every visible child. This function is only called when updateLayout() has returned true.

The overriding function should call the base class's draw(), the place where the call this function will determine the order of the vertices into each buffer. This is important when needing to do the painters algorithm for alpha-compositing. However the pipelines are always drawn in the same order.

Precondition: mutex must be locked by current thread.

Parameters

context	The context to where the widget will draw.
display_time_point	The time point when the widget will be shown on the screen.

Reimplemented from tt::widget.

◆ foreground_color()

template<bool IsVertical>

color tt::scroll_bar_widget< IsVertical >::foreground_color ( ) const

inlineoverridevirtualnoexcept

Reimplemented from tt::widget.

◆ handle_event()

template<bool IsVertical>

bool tt::scroll_bar_widget< IsVertical >::handle_event ( mouse_event const & event )

inlinevirtualnoexcept

Handle mouse event. Called by the operating system to show the position and button state of the mouse. This is called very often so it must be made efficient. This function is also used to determine the mouse cursor.

In most cased overriding methods should call the super's handle_event() at the start of the function, to detect hover.

When this method does not handle the event the window will call handle_event() on the widget's parent.

Parameters

event The mouse event, positions are in window coordinates.

Returns: If this widget has handled the mouse event.

Reimplemented from tt::widget.

◆ hitbox_test()

template<bool IsVertical>

hit_box tt::scroll_bar_widget< IsVertical >::hitbox_test ( point2 position ) const

inlineoverridevirtualnoexcept

Find the widget that is under the mouse cursor.

This function will recursively test with visual child widgets, when widgets overlap on the screen the hitbox object with the highest elevation is returned.

Parameters

position The coordinate of the mouse local to the widget.

Returns: A hit_box object with the cursor-type and a reference to the widget.

Reimplemented from tt::widget.

◆ update_constraints()

template<bool IsVertical>

bool tt::scroll_bar_widget< IsVertical >::update_constraints	(	hires_utc_clock::time_point	display_time_point,
		bool	need_reconstrain )

inlineoverridevirtualnoexcept

Update the constraints of the widget.

This function is called on each vertical sync, even if no drawing is to be done. It should recursively call updateConstraints() on each of the visible children, so they get a chance to update.

This function may be used for expensive calculations, such as text-shaping, which should only be done when the data changes. Because this function is called on every vertical sync it should cache these calculations.

Subclasses should call updateConstraints() on its base-class to check if the constraints where changed. Widget::update_constraints() will check if requestConstraints was set. Container::update_constraints() will check if any of the children changed constraints.

If the container, due to a change in constraints, wants the window to resize to the minimum size it should set window.requestResize to true.

This function will change what is returned by preferred_size() and preferred_base_line().

Precondition: mutex must be locked by current thread.

Parameters

display_time_point	The time point when the widget will be shown on the screen.
need_reconstrain	Force the widget to re-constrain.

Returns: True if its or any children's constraints has changed.

Reimplemented from tt::widget.

◆ update_layout()

template<bool IsVertical>

void tt::scroll_bar_widget< IsVertical >::update_layout	(	hires_utc_clock::time_point	display_time_point,
		bool	need_layout )

inlineoverridevirtualnoexcept

Update the internal layout of the widget.

This function is called on each vertical sync, even if no drawing is to be done. It should recursively call updateLayout() on each of the visible children, so they get a chance to update.

This function may be used for expensive calculations, such as geometry calculations, which should only be done when the data or sizes change. Because this function is called on every vertical sync it should cache these calculations.

This function will likely call set_layout_parameters() on its children.

Subclasses should call updateLayout() on its children, call updateLayout() on its base class with forceLayout argument to the result of layoutRequest.exchange(false).

Precondition: mutex must be locked by current thread.

Parameters

display_time_point	The time point when the widget will be shown on the screen.
need_layout	Force the widget to layout

Reimplemented from tt::widget.

◆ visible()

template<bool IsVertical>

bool tt::scroll_bar_widget< IsVertical >::visible ( ) const

inlinenoexcept

Is the scrollbar visible.

When the content is the same size as the scroll-view then the scrollbar becomes invisible.

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

hikogui/src/ttauri/widgets/scroll_bar_widget.hpp

Public Types

Public Member Functions

Static Public Attributes

Additional Inherited Members

Member Function Documentation

◆ accepts_keyboard_focus()

◆ background_color()

◆ draw()

◆ foreground_color()

◆ handle_event()

◆ hitbox_test()

◆ update_constraints()

◆ update_layout()

◆ visible()