XAccessibleText Interface Reference

Implement this interface to give read-only access to a text. More...

import"XAccessibleText.idl";

Inheritance diagram for XAccessibleText:

Public Member Functions
long	getCaretPosition ()
	Return the position of the caret. More...
boolean	setCaretPosition ([in] long nIndex) raises (::com::sun::star::lang::IndexOutOfBoundsException)
	Set the position of the caret. More...
char	getCharacter ([in] long nIndex) raises (::com::sun::star::lang::IndexOutOfBoundsException)
	Return the character at the specified position. More...
sequence<::com::sun::star::beans::PropertyValue >	getCharacterAttributes ([in] long nIndex, [in] sequence< string > aRequestedAttributes) raises (::com::sun::star::lang::IndexOutOfBoundsException, ::com::sun::star::beans::UnknownPropertyException)
	Get the attribute set for the specified position. More...
::com::sun::star::awt::Rectangle	getCharacterBounds ([in] long nIndex) raises (::com::sun::star::lang::IndexOutOfBoundsException)
	Return the bounding box of the specified position. More...
long	getCharacterCount ()
	Return the number of characters in the represented text. More...
long	getIndexAtPoint ([in] ::com::sun::star::awt::Point aPoint)
	Return the text position for the specified screen position. More...
string	getSelectedText ()
	Return the selected text. More...
long	getSelectionStart ()
	Return the position of the start of the selection. More...
long	getSelectionEnd ()
	Return the position of the end of the selection. More...
boolean	setSelection ([in] long nStartIndex, [in] long nEndIndex) raises (::com::sun::star::lang::IndexOutOfBoundsException)
	Set a new selection. More...
string	getText ()
	Return the whole text. More...
string	getTextRange ([in] long nStartIndex, [in] long nEndIndex) raises (::com::sun::star::lang::IndexOutOfBoundsException)
	Return the specified text range. More...
TextSegment	getTextAtIndex ([in] long nIndex, [in] short nTextType) raises (::com::sun::star::lang::IndexOutOfBoundsException, ::com::sun::star::lang::IllegalArgumentException)
	Get a text portion around the given position. More...
TextSegment	getTextBeforeIndex ([in] long nIndex, [in] short nTextType) raises (::com::sun::star::lang::IndexOutOfBoundsException, ::com::sun::star::lang::IllegalArgumentException)
	Get a text portion before the given position. More...
TextSegment	getTextBehindIndex ([in] long nIndex, [in] short nTextType) raises (::com::sun::star::lang::IndexOutOfBoundsException, ::com::sun::star::lang::IllegalArgumentException)
	Get a text portion behind the given position. More...
boolean	copyText ([in] long nStartIndex, [in] long nEndIndex) raises (::com::sun::star::lang::IndexOutOfBoundsException)
	Copy the specified text into the clipboard. More...
boolean	scrollSubstringTo ([in] long nStartIndex, [in] long nEndIndex, [in] AccessibleScrollType aScrollType) raises (::com::sun::star::lang::IndexOutOfBoundsException)
	Scroll the specified text to make it visible on screen. More...
Public Member Functions inherited from XInterface
any	queryInterface ([in] type aType)
	queries for a new interface to an existing UNO object. More...
void	acquire ()
	increases the reference counter by one. More...
void	release ()
	decreases the reference counter by one. More...

Detailed Description

Implement this interface to give read-only access to a text.

The XAccessibleText interface should be implemented by all UNO components that present textual information on the display like buttons, text entry fields, or text portions of the document window. The interface provides access to the text's content, attributes, and spatial location. However, text can not be modified with this interface. That is the task of the XAccessibleEditableText interface.

The text length, i.e. the number of characters in the text, is returned by XAccessibleText::getCharacterCount(). All methods that operate on particular characters (e.g. XAccessibleText::getCharacterAt()) use character indices from 0 to length-1. All methods that operate on character positions (e.g. XAccessibleText::getTextRange()) use indices from 0 to length.

Please note that accessible text does not necessarily support selection. In this case it should behave as if there where no selection. An empty selection is used for example to express the current cursor position.

Since

OOo 1.1.2

Member Function Documentation

copyText()

boolean copyText	(	[in] long	nStartIndex,
		[in] long	nEndIndex
	)
raises	(	::com::sun::star::lang::IndexOutOfBoundsException
	)

Copy the specified text into the clipboard.

Copy the specified text into the clipboard. The text that is copied is the same text that would have been selected by the XAccessibleText::getTextRange() method.

The other clipboard related methods XAccessibleEditableText::cutText() and XAccessibleEditableText::deleteText() can be found in the XAccessibleEditableText because of their destructive nature.

Parameters

nStartIndex	Start index of the text to copied into the clipboard. The valid range is 0..length.
nEndIndex	End index of the text to copied into the clipboard. The valid range is 0..length.

Returns

Returns TRUE if the specified text has been copied successfully into the clipboard.

Exceptions

com::sun::star::lang::IndexOutOfBoundsException

if the indices are invalid

getCaretPosition()

long getCaretPosition

(

)

Return the position of the caret.

Returns the offset of the caret. The caret is often called text cursor. The caret is actually the position between two characters. Its position/offset is that of the character to the right of it.

Returns

The returned offset is relative to the text represented by this object.

getCharacter()

char getCharacter	(	[in] long	nIndex	)
raises	(	::com::sun::star::lang::IndexOutOfBoundsException
	)

Return the character at the specified position.

Returns the character at the given index.

Parameters

nIndex

The index of the character to return. The valid range is 0..length-1.

Returns

the character at the index nIndex.

Exceptions

com::sun::star::lang::IndexOutOfBoundsException

if the index is invalid

getCharacterAttributes()

sequence<::com::sun::star::beans::PropertyValue> getCharacterAttributes	(	[in] long	nIndex,
		[in] sequence< string >	aRequestedAttributes
	)
raises	(	::com::sun::star::lang::IndexOutOfBoundsException,
		::com::sun::star::beans::UnknownPropertyException
	)

Get the attribute set for the specified position.

Returns a set of attributes that are associated for the character at the given index. To prevent the method from returning possibly large sets of attributes that the caller is not interested in the caller has to provide a list of attributes that he wants to be returned.

Parameters

nIndex	The index of the character for which to return its attributes. The valid range is 0..length-1.
aRequestedAttributes	This string sequence defines the set of attributes that the caller is interested in. When there are attributes defined that are not listed in the sequence then they are not returned. When there are requested attributes that are not defined for the character then they are ignored, too.

An empty sequence signals the callers interest in all the attributes. This is useful in two cases: a) Simply as a way to avoid passing a potentially large array to the called object or b) when the caller does not know what attributes the called objects supports but is interested in all of them nevertheless.

Returns

Returns the explicitly or implicitly (empty aRequestedAttributes argument) requested attributes of the specified character. Each attribute is represented by a com::sun::star::beans::PropertyValue object. The returned list of attribute descriptions contains all attributes that are both members of the sequence of requested attributes and are defined for the character at the specified index.

Exceptions

com::sun::star::lang::IndexOutOfBoundsException

if the index is invalid

See also

CharacterProperties

getCharacterBounds()

::com::sun::star::awt::Rectangle getCharacterBounds	(	[in] long	nIndex	)
raises	(	::com::sun::star::lang::IndexOutOfBoundsException
	)

Return the bounding box of the specified position.

Returns the bounding box of the indexed character.

The virtual character after the last character of the represented text, i.e. the one at position length is a special case. It represents the current input position and will therefore typically be queried by AT more often than other positions. Because it does not represent an existing character its bounding box is defined in relation to preceding characters. It should be roughly equivalent to the bounding box of some character when inserted at the end of the text. Its height typically being the maximal height of all the characters in the text or the height of the preceding character, its width being at least one pixel so that the bounding box is not degenerate.
Note that the index "length" is not always valid. Whether it is or not is implementation dependent. It typically is when text is editable or otherwise when on the screen the caret can be placed behind the text. You can be sure that the index is valid after you have received an AccessibleEventId::CARET event for this index.

Parameters

nIndex

Index of the character for which to return its bounding box. The valid range is 0..length.

Returns

The bounding box of the referenced character. The bounding box of the virtual character at position length has to have non-empty dimensions.

Exceptions

com::sun::star::lang::IndexOutOfBoundsException

if the index is invalid

getCharacterCount()

long getCharacterCount

(

)

Return the number of characters in the represented text.

Returns the number of characters in the text represented by this object or, in other words, the text length.

Returns

Returns the number of characters of this object's text. A zero value indicates an empty text.

getIndexAtPoint()

long getIndexAtPoint

(

[in] ::com::sun::star::awt::Point

aPoint

)

Return the text position for the specified screen position.

Given a point in local coordinates, i.e. relative to the coordinate system of the object, return the zero-based index of the character under that point. The same functionality could be achieved by using the bounding boxes for each character as returned by XAccessibleText::getCharacterBounds(). The method XAccessibleText::getIndexAtPoint(), however, can be implemented in a more efficient way.

Parameters

aPoint

The position for which to look up the index of the character that is rendered on to the display at that point.

Returns

Index of the character under the given point or -1 if the point is invalid or there is no character under the point.

getSelectedText()

string getSelectedText

(

)

Return the selected text.

Returns the portion of the text that is selected.

Returns

The returned text is the selected portion of the object's text. If no text is selected when this method is called or when selection is not supported an empty string is returned.

getSelectionEnd()

long getSelectionEnd

(

)

Return the position of the end of the selection.

Returns the index of the end of the selected text.

Returns

If there is no selection or selection is not supported the position of selection start and end will be the same undefined value.

getSelectionStart()

long getSelectionStart

(

)

Return the position of the start of the selection.

Returns the index of the start of the selected text.

Returns

If there is no selection or selection is not supported the position of selection start and end will be the same undefined value.

getText()

string getText

(

)

Return the whole text.

Returns the complete text. This is equivalent to a call to XAccessibleText::getTextRange() with the arguments zero and getCharacterCount()-1.

Returns

Returns a string that contains the complete text.

getTextAtIndex()

TextSegment getTextAtIndex	(	[in] long	nIndex,
		[in] short	nTextType
	)
raises	(	::com::sun::star::lang::IndexOutOfBoundsException,
		::com::sun::star::lang::IllegalArgumentException
	)

Get a text portion around the given position.

Returns the substring of the specified text type that contains the character at the given index, if any. For example, given the text type AccessibleTextType::WORD, the word which contains the character at position nIndex is returned, or an empty string if no word is found at the that position.

Parameters

nIndex	Index of the character whose containing text portion is to be returned. The valid range is 0..length.
nTextType	The type of the text portion to return. See AccessibleTextType for the complete list.

Returns

Returns the requested text portion. This portion may be empty or invalid when no appropriate text portion is found or text type is invalid.

Exceptions

com::sun::star::lang::IndexOutOfBoundsException	if the index is invalid
com::sun::star::lang::IllegalArgumentException	if the given text type is not valid.

getTextBeforeIndex()

TextSegment getTextBeforeIndex	(	[in] long	nIndex,
		[in] short	nTextType
	)
raises	(	::com::sun::star::lang::IndexOutOfBoundsException,
		::com::sun::star::lang::IllegalArgumentException
	)

Get a text portion before the given position.

Returns the substring of the specified text type that is located before the given character and does not include it. The result of this method should be same as a result for XAccessibleText::getTextAtIndex() with a suitably decreased index value.

For example, if text type is AccessibleTextType::WORD, then the complete word that is closest to and located before nIndex is returned.

If the index is valid, but no suitable word (or other text type) is found, an empty text segment is returned.

Parameters

nIndex	Index of the character for which to return the text part before it. The index character will not be part of the returned string. The valid range is 0..length.
nTextType	The type of the text portion to return. See AccessibleTextType for the complete list.

Returns

Returns the requested text portion. This portion may be empty or invalid when no appropriate text portion is found or text type is invalid.

Exceptions

com::sun::star::lang::IndexOutOfBoundsException	if the index is invalid.
com::sun::star::lang::IllegalArgumentException	if the given text type is not valid.

getTextBehindIndex()

TextSegment getTextBehindIndex	(	[in] long	nIndex,
		[in] short	nTextType
	)
raises	(	::com::sun::star::lang::IndexOutOfBoundsException,
		::com::sun::star::lang::IllegalArgumentException
	)

Get a text portion behind the given position.

Returns the substring of the specified text type that is located after the given character and does not include it. The result of this method should be same as a result for XAccessibleText::getTextAtIndex() with a suitably increased index value.

For example, if text type is AccessibleTextType::WORD, then the complete word that is closest to and located behind nIndex is returned.

If the index is valid, but no suitable word (or other text type) is found, an empty string is returned.

Parameters

nIndex	Index of the character for which to return the text part after it. The index character will not be part of the returned string. The valid range is 0..length.
nTextType	The type of the text portion to return. See AccessibleTextType for the complete list.

Returns

Returns the requested text portion. This portion may be empty or invalid when no appropriate text portion is found or text type is invalid.

Exceptions

com::sun::star::lang::IndexOutOfBoundsException	if the index is invalid
com::sun::star::lang::IllegalArgumentException	if the given text type is not valid.

getTextRange()

string getTextRange	(	[in] long	nStartIndex,
		[in] long	nEndIndex
	)
raises	(	::com::sun::star::lang::IndexOutOfBoundsException
	)

Return the specified text range.

Returns the substring between the two given indices.

The substring starts with the character at nStartIndex (inclusive) and up to the character at nEndIndex (exclusive), if nStartIndex is less or equal nEndIndex. If nEndIndex is lower than nStartIndex, the result is the same as a call with the two arguments being exchanged.

The whole text can be requested by passing the indices zero and getCharacterCount(). If both indices have the same value, an empty string is returned.

Parameters

nStartIndex	Index of the first character to include in the returned string. The valid range is 0..length.
nEndIndex	Index of the last character to exclude in the returned string. The valid range is 0..length.

Returns

Returns the substring starting with the character at nStartIndex (inclusive) and up to the character at nEndIndex (exclusive), if nStartIndex is less than or equal to nEndIndex.

Exceptions

com::sun::star::lang::IndexOutOfBoundsException

if the indices are invalid

scrollSubstringTo()

boolean scrollSubstringTo	(	[in] long	nStartIndex,
		[in] long	nEndIndex,
		[in] AccessibleScrollType	aScrollType
	)
raises	(	::com::sun::star::lang::IndexOutOfBoundsException
	)

Scroll the specified text to make it visible on screen.

Parameters

nStartIndex	Start index of the text to scroll. The valid range is 0..length.
nEndIndex	End index of the text to scroll. The valid range is nStartIndex..length.
aScrollType	Type of scroll to perform. See AccessibleScrollType for the complete list.

Returns

Returns TRUE if the specified text has been scrolled successfully.

Exceptions

com::sun::star::lang::IndexOutOfBoundsException

if the indices are invalid

Since

LibreOffice 7.0

setCaretPosition()

boolean setCaretPosition	(	[in] long	nIndex	)
raises	(	::com::sun::star::lang::IndexOutOfBoundsException
	)

Set the position of the caret.

The caret is often called text cursor. The caret is actually the position between two characters. Its position/offset is that of the character to the right of it.

Setting the caret position may or may not alter the current selection. A change of the selection is notified to the accessibility event listeners with an AccessibleEventId::ACCESSIBLE_SELECTION_EVENT.

When the new caret position differs from the old one (which, of course, is the standard case) this is notified to the accessibility event listeners with an AccessibleEventId::ACCESSIBLE_CARET_EVENT.

Parameters

nIndex

The new index of the caret. This caret is actually placed to the left side of the character with that index. An index of 0 places the caret so that the next insertion goes before the first character. An index of getCharacterCount() leads to insertion after the last character.

Returns

Returns TRUE if the caret has been moved and FALSE otherwise. A TRUE value does not necessarily mean that the caret has been positioned exactly at the required position. If that position lies inside a read-only area the caret is positioned before or behind it. Listen to the caret event to determine the new position.

Exceptions

com::sun::star::lang::IndexOutOfBoundsException

if the index is not valid.

setSelection()

boolean setSelection	(	[in] long	nStartIndex,
		[in] long	nEndIndex
	)
raises	(	::com::sun::star::lang::IndexOutOfBoundsException
	)

Set a new selection.

Sets the selected text portion according to the given indices. The old selection is replaced by the new selection.

The selection encompasses the same string of text that XAccessibleText::getTextRange() would have selected. See there for details.

Setting the selection may or may not change the caret position. Typically the caret is moved to the position after the second argument. When the caret is moved this is notified to the accessibility event listeners with an AccessibleEventId::ACCESSIBLE_CARET_EVENT.

Parameters

nStartIndex	The first character of the new selection. The valid range is 0..length.
nEndIndex	The position after the last character of the new selection. The valid range is 0..length.

Returns

Returns TRUE if the selection has been set successfully and FALSE otherwise or when selection is not supported.

Exceptions

com::sun::star::lang::IndexOutOfBoundsException

if the indices are invalid

---

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

• com/sun/star/accessibility/XAccessibleText.idl