gui2::iterator::twalker_ Class Reference

The walker abstract base class. More...

#include <walker.hpp>

Inheritance diagram for gui2::iterator::twalker_:

Public Types
enum	tlevel { widget, grid, child }
	The level to walk at. More...
enum	tstate { valid, invalid, fail }
	The state of the walker. More...

Public Member Functions
virtual	~twalker_ ()
virtual tstate	next (const tlevel level)=0
	Make the next widget the current one. More...
virtual bool	at_end (const tlevel level) const =0
	Returns whether the current widget is valid. More...
virtual gui2::twidget *	get (const tlevel level)=0
	Returns a pointer to the current widget. More...

Detailed Description

The walker abstract base class.

Definition at line 27 of file walker.hpp.

Member Enumeration Documentation

enum gui2::iterator::twalker_::tlevel

The level to walk at.

Enumerator
widget	Visit the widget itself. Visit its nested grid.
grid	Visit the children of its nested grid.
child

Definition at line 35 of file walker.hpp.

enum gui2::iterator::twalker_::tstate

The state of the walker.

The enum is used to return the state of next.

Enumerator
valid	When calling next the following it has the following results. Precondition at_end == false Postcondition the next widget became the current one. at_end == false When calling next the following it has the following results. Precondition at_end == false Postcondition there is no longer a current widget. at_end == true
invalid	When calling next the following it has the following results. Precondition at_end == true Postcondition at_end == true
fail

Definition at line 51 of file walker.hpp.

Constructor & Destructor Documentation

virtual gui2::iterator::twalker_::~twalker_ ( )

inlinevirtual

Definition at line 30 of file walker.hpp.

Member Function Documentation

virtual bool gui2::iterator::twalker_::at_end ( const tlevel  level ) const

pure virtual

Returns whether the current widget is valid.

Parameters

level

Determines on which level the test should be executed.

Returns

Whether the current widget is valid.

Implemented in gui2::iterator::walker::twidget, and gui2::iterator::tgrid.

Referenced by gui2::iterator::policy::visit::tvisit< level >::at_end().

virtual gui2::twidget* gui2::iterator::twalker_::get ( const tlevel  level )

pure virtual

Returns a pointer to the current widget.

Precondition

The following assertion holds:

at_end(level) == false 

Parameters

level

Determines from which level should the current widget be returned.

Returns

Pointer to the current widget.

Implemented in gui2::iterator::walker::twidget, and gui2::iterator::tgrid.

virtual tstate gui2::iterator::twalker_::next ( const tlevel  level )

pure virtual

Make the next widget the current one.

Parameters

level

Determines on which level the next one should be selected.

Returns

The status of the operation.

Implemented in gui2::iterator::walker::twidget, and gui2::iterator::tgrid.

Referenced by gui2::iterator::policy::visit::tvisit< level >::next().

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

• gui/auxiliary/iterator/walker.hpp