tt::detail::observable_value< T > Class Template Reference

Inheritance diagram for tt::detail::observable_value< T >:

Public Member Functions
	observable_value (T const &value) noexcept
virtual T	load () const noexcept override
	Get the current value.
virtual bool	store (T const &new_value) noexcept override
	Set the value.
Public Member Functions inherited from tt::detail::observable_base< T >
	observable_base (observable_base const &)=delete
	observable_base (observable_base &&)=delete
observable_base &	operator= (observable_base const &)=delete
observable_base &	operator= (observable_base &&)=delete
	observable_base () noexcept
	Constructor.
T	previous_value () const noexcept
	Get the previous value.
time_point	time_when_last_modified () const noexcept
	Time when the value was modified last.
duration	duration_since_last_modified () const noexcept
	Duration since the value was last modified.
float	animation_progress (duration animation_duration) const noexcept
	The relative time since the start of the animation.
T	load (duration animation_duration) const noexcept
	Get the current value animated over the animation_duration.
size_t	add_callback (callback_type callback) noexcept
	Add a callback as a listener.
void	remove_callback (size_t id) noexcept
	Remove a callback.

Additional Inherited Members
Public Types inherited from tt::detail::observable_base< T >
using	callback_type = std::function<void(T const &)>
using	time_point = typename hires_utc_clock::time_point
using	duration = typename hires_utc_clock::duration

Member Function Documentation

load()

template<typename T >

virtual T tt::detail::observable_value< T >::load ( ) const

inlineoverridevirtualnoexcept

Get the current value.

The value is often calculated directly from the cached values retrieved from notifications down the chain.

Implements tt::detail::observable_base< T >.

store()

template<typename T >

virtual bool tt::detail::observable_value< T >::store ( T const & new_value )

inlineoverridevirtualnoexcept

Set the value.

The value is often not directly stored, but instead forwarded up the chain of observables. And then let the notifications flowing backward updated the cached values so that loads() will be quick.

Parameters

new_value

The new value

Returns

true if the value was different from before.

Implements tt::detail::observable_base< T >.

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

• hikogui/src/TTauri/Foundation/detail/observable_value.hpp