nana::dev::widget_content_measurer_interface Class Reference

An interface for measuring content of the widget. More...

Inheritance diagram for nana::dev::widget_content_measurer_interface:

Public Types
using	graph_reference = paint::graphics &

Public Member Functions
virtual	~widget_content_measurer_interface ()=default
virtual ::std::optional< size >	measure (graph_reference graph, unsigned limit_pixels, bool limit_width) const =0
	Measures content. More...
virtual size	extension () const =0
	Returns the extension to the size of widget from content extent. More...

Detailed Description

An interface for measuring content of the widget.

Member Typedef Documentation

using nana::dev::widget_content_measurer_interface::graph_reference = paint::graphics&

Constructor & Destructor Documentation

virtual nana::dev::widget_content_measurer_interface::~widget_content_measurer_interface ( )

virtualdefault

Member Function Documentation

virtual size nana::dev::widget_content_measurer_interface::extension ( ) const

pure virtual

Returns the extension to the size of widget from content extent.

Returns

the width and height of extension to the widget size.

Implemented in nana::drawerbase::label::trigger::implement::measurer, nana::drawerbase::picture::content_measurer, and nana::drawerbase::button::trigger::measurer.

virtual ::std::optional<size> nana::dev::widget_content_measurer_interface::measure ( graph_reference  graph, unsigned  limit_pixels, bool  limit_width  ) const

pure virtual

Measures content.

Parameters

graph	The graphics for the operation.
limit_pixels	The number of pixels of the limited edge. If this parameter is zero, it is ignored.
limit_width	True if limits the width, false if limits the height.

Returns

the size of content.

Implemented in nana::drawerbase::label::trigger::implement::measurer, nana::drawerbase::picture::content_measurer, and nana::drawerbase::button::trigger::measurer.