KTextEditor::Cursor Class Reference

#include <cursor.h>

Inheritance diagram for KTextEditor::Cursor:

Public Member Functions
	Cursor ()
	Cursor (int line, int column)
	Cursor (const Cursor &copy)
virtual	~Cursor ()
virtual bool	isSmartCursor () const
virtual bool	isValid () const
Cursor &	operator= (const Cursor &cursor)
Range *	range () const
virtual SmartCursor *	toSmartCursor () const
Position
The following functions provide access to, and manipulation of, the cursor's position.
virtual void	setPosition (const Cursor &position)
void	setPosition (int line, int column)
virtual int	line () const
virtual void	setLine (int line)
int	column () const
virtual void	setColumn (int column)
bool	atStartOfLine () const
bool	atStartOfDocument () const
void	position (int &line, int &column) const

Static Public Member Functions
static Cursor	invalid ()
static Cursor	start ()

Protected Member Functions
void	cursorChangedDirectly (const Cursor &from)
virtual void	setRange (Range *range)

Protected Attributes
int	m_column
int	m_line
Range *	m_range

Friends
bool	operator!= (const Cursor &c1, const Cursor &c2)
Cursor	operator+ (const Cursor &c1, const Cursor &c2)
Cursor &	operator+= (Cursor &c1, const Cursor &c2)
Cursor	operator- (const Cursor &c1, const Cursor &c2)
Cursor &	operator-= (Cursor &c1, const Cursor &c2)
bool	operator< (const Cursor &c1, const Cursor &c2)
QDebug	operator<< (QDebug s, const Cursor &cursor)
bool	operator<= (const Cursor &c1, const Cursor &c2)
bool	operator== (const Cursor &c1, const Cursor &c2)
bool	operator> (const Cursor &c1, const Cursor &c2)
bool	operator>= (const Cursor &c1, const Cursor &c2)

Detailed Description

An object which represents a position in a Document.

A Cursor is a basic class which contains the line() and column() a position in a Document. It is very lightweight and maintains no affiliation with a particular Document.

If you want additional functionality such as the ability to maintain position in a document, see SmartCursor.

Note

The Cursor class is designed to be passed via value, while SmartCursor and derivatives must be passed via pointer or reference as they maintain a connection with their document internally and cannot be copied.

Lines and columns start at 0.

Think of cursors as having their position at the start of a character, not in the middle of one.

If a Cursor is associated with a Range the Range will be notified whenever the cursor (i.e. start or end position) changes its position. Read the class documentation about Ranges for further details.

See also

SmartCursor

Definition at line 61 of file cursor.h.

Constructor & Destructor Documentation

Cursor::Cursor

(

)

The default constructor creates a cursor at position (0,0).

Definition at line 26 of file cursor.cpp.

Cursor::Cursor	(	int	line,
		int	column
	)

This constructor creates a cursor initialized with line and column.

Parameters

line	line for cursor
column	column for cursor

Definition at line 33 of file cursor.cpp.

Cursor::Cursor

(

const Cursor &

copy

)

Copy constructor.

Does not copy the owning range, as a range does not have any association with copies of its cursors.

Parameters

copy	the cursor to copy.

Definition at line 40 of file cursor.cpp.

Cursor::~Cursor ( )

virtual

Virtual destructor.

Definition at line 129 of file cursor.cpp.

Member Function Documentation

bool KTextEditor::Cursor::atStartOfDocument

(

)

const

Determine if this cursor is located at the start of a document.

Returns

true if the cursor is situated at the start of the document, false if it isn't.

Definition at line 153 of file cursor.cpp.

bool KTextEditor::Cursor::atStartOfLine

(

)

const

Determine if this cursor is located at the start of a line.

Returns

true if the cursor is situated at the start of the line, false if it isn't.

Definition at line 148 of file cursor.cpp.

int Cursor::column

(

)

const

Retrieve the column on which this cursor is situated.

Returns

column number, where 0 is the first column.

Definition at line 79 of file cursor.cpp.

void KTextEditor::Cursor::cursorChangedDirectly ( const Cursor &  from )

protected

Notify the owning range, if any, that this cursor has changed directly.

Definition at line 138 of file cursor.cpp.

Cursor Cursor::invalid ( )

static

Returns an invalid cursor.

Definition at line 52 of file cursor.cpp.

bool Cursor::isSmartCursor ( ) const

virtual

Returns whether this cursor is a SmartCursor.

Reimplemented in KTextEditor::SmartCursor.

Definition at line 109 of file cursor.cpp.

bool Cursor::isValid ( ) const

virtual

Returns whether the current position of this cursor is a valid position (line + column must both be >= 0).

Smart cursors should override this to return whether the cursor is valid within the linked document.

Reimplemented in KTextEditor::SmartCursor.

Definition at line 47 of file cursor.cpp.

int Cursor::line ( ) const

virtual

Retrieve the line on which this cursor is situated.

Returns

line number, where 0 is the first line.

Definition at line 62 of file cursor.cpp.

Cursor& KTextEditor::Cursor::operator= ( const Cursor &  cursor )

inline

Assignment operator.

Same as setPosition().

Parameters

cursor

the position to assign.

Returns

a reference to this cursor

See also

setPosition()

Definition at line 202 of file cursor.h.

void Cursor::position	(	int &	line,
		int &	column
	)		const

Get both the line and column of the cursor position.

Parameters

line	will be filled with current cursor line
column	will be filled with current cursor column

Definition at line 119 of file cursor.cpp.

Range * Cursor::range

(

)

const

Returns the range that this cursor belongs to, if any.

Definition at line 124 of file cursor.cpp.

void Cursor::setColumn ( int  column )

virtual

Set the cursor column to column.

Parameters

column

new cursor column

Definition at line 84 of file cursor.cpp.

void Cursor::setLine ( int  line )

virtual

Set the cursor line to line.

Parameters

line	new cursor line

Definition at line 67 of file cursor.cpp.

void Cursor::setPosition ( const Cursor &  position )

virtual

Set the current cursor position to position.

Parameters

position

new cursor position

Todo:

add bool to indicate success or not, for smart cursors?

Definition at line 96 of file cursor.cpp.

void Cursor::setPosition	(	int	line,
		int	column
	)

This is an overloaded member function, provided for convenience. It differs from the above function only in what argument(s) it accepts.Set the cursor position to line and column.

Parameters

line	new cursor line
column	new cursor column

Definition at line 114 of file cursor.cpp.

void Cursor::setRange ( Range *  range )

protectedvirtual

Sets the range that this cursor belongs to.

Parameters

range

the range that this cursor is referenced from.

Definition at line 133 of file cursor.cpp.

Cursor Cursor::start ( )

static

Returns a cursor representing the start of any document - i.e., line 0, column 0.

Definition at line 57 of file cursor.cpp.

SmartCursor * KTextEditor::Cursor::toSmartCursor ( ) const

virtual

Returns this cursor as a SmartCursor, if it is one.

Reimplemented in KTextEditor::SmartCursor.

Definition at line 158 of file cursor.cpp.

Friends And Related Function Documentation

bool operator!= ( const Cursor &  c1, const Cursor &  c2  )

friend

Inequality operator.

Parameters

c1	first cursor to compare
c2	second cursor to compare

Returns

true, if c1's and c2's line and column are not equal.

Definition at line 262 of file cursor.h.

Cursor operator+ ( const Cursor &  c1, const Cursor &  c2  )

friend

Addition operator.

Takes two cursors and returns their summation.

Parameters

c1	the first position
c2	the second position

Returns

a the summation of the two input cursors

Definition at line 211 of file cursor.h.

Cursor& operator+= ( Cursor &  c1, const Cursor &  c2  )

friend

Addition assignment operator.

Adds c2 to this cursor.

Parameters

c1	the cursor being added to
c2	the position to add

Returns

a reference to the cursor which has just been added to

Definition at line 220 of file cursor.h.

Cursor operator- ( const Cursor &  c1, const Cursor &  c2  )

friend

Subtraction operator.

Takes two cursors and returns the subtraction of c2 from c1.

Parameters

c1	the first position
c2	the second position

Returns

a cursor representing the subtraction of c2 from c1

Definition at line 231 of file cursor.h.

Cursor& operator-= ( Cursor &  c1, const Cursor &  c2  )

friend

Subtraction assignment operator.

Subtracts c2 from c1.

Parameters

c1	the cursor being subtracted from
c2	the position to subtract

Returns

a reference to the cursor which has just been subtracted from

Definition at line 240 of file cursor.h.

bool operator< ( const Cursor &  c1, const Cursor &  c2  )

friend

Less than operator.

Parameters

c1	first cursor to compare
c2	second cursor to compare

Returns

true, if c1's position is greater than or equal to c2's position, otherwise false.

Definition at line 292 of file cursor.h.

QDebug operator<< ( QDebug  s, const Cursor &  cursor  )

friend

kDebug() stream operator.

Writes this cursor to the debug output in a nicely formatted way.

Definition at line 308 of file cursor.h.

bool operator<= ( const Cursor &  c1, const Cursor &  c2  )

friend

Less than or equal to operator.

Parameters

c1	first cursor to compare
c2	second cursor to compare

Returns

true, if c1's position is lesser than or equal to c2's position, otherwise false.

Definition at line 302 of file cursor.h.

bool operator== ( const Cursor &  c1, const Cursor &  c2  )

friend

Equality operator.

Note

comparison between two invalid cursors is undefined. comparison between and invalid and a valid cursor will always be false.

Parameters

c1	first cursor to compare
c2	second cursor to compare

Returns

true, if c1's and c2's line and column are equal.

Definition at line 253 of file cursor.h.

bool operator> ( const Cursor &  c1, const Cursor &  c2  )

friend

Greater than operator.

Parameters

c1	first cursor to compare
c2	second cursor to compare

Returns

true, if c1's position is greater than c2's position, otherwise false.

Definition at line 272 of file cursor.h.

bool operator>= ( const Cursor &  c1, const Cursor &  c2  )

friend

Greater than or equal to operator.

Parameters

c1	first cursor to compare
c2	second cursor to compare

Returns

true, if c1's position is greater than or equal to c2's position, otherwise false.

Definition at line 282 of file cursor.h.

Member Data Documentation

int KTextEditor::Cursor::m_column

protected

Cursor column

Definition at line 345 of file cursor.h.

int KTextEditor::Cursor::m_line

protected

Cursor line

Definition at line 338 of file cursor.h.

Range* KTextEditor::Cursor::m_range

protected

Range which owns this cursor, if any

Definition at line 352 of file cursor.h.

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

• cursor.h
• cursor.cpp