atkmm: Atk::Text Class Reference

atkmm 2.22.7

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Atk::Text Class Reference

The ATK interface implemented by components with text content. More...

`#include <atkmm/text.h>`

Inheritance diagram for Atk::Text:
[legend]

## Public Member Functions
AtkText* | gobj ()
| Provides access to the underlying C GObject.
const AtkText* | gobj () const
| Provides access to the underlying C GObject.
Glib::ustring | get_text (int start_offset, int end_offset) const
| Gets the specified text. More...
gunichar | get_character_at_offset (int offset) const
| Gets the specified text. More...
Glib::ustring | get_text_after_offset (int offset, TextBoundary boundary_type, int& start_offset, int& end_offset) const
| Gets the specified text. More...
Glib::ustring | get_text_at_offset (int offset, TextBoundary boundary_type, int& start_offset, int& end_offset) const
| Gets the specified text. More...
Glib::ustring | get_text_before_offset (int offset, TextBoundary boundary_type, int& start_offset, int& end_offset) const
| Gets the specified text. More...
int | get_caret_offset () const
| Gets the offset position of the caret (cursor). More...
void | get_character_extents (int offset, int& x, int& y, int& width, int& height, CoordType coords) const
| Get the bounding box containing the glyph representing the character at a particular text offset. More...
AttributeSet | get_run_attributes (int offset, int& start_offset, int& end_offset) const
| Creates an Atk::AttributeSet which consists of the attributes explicitly set at the position offset in the text. More...
AttributeSet | get_default_attributes () const
| Creates an Atk::AttributeSet which consists of the default values of attributes for the text. More...
int | get_character_count () const
| Gets the character count. More...
int | get_offset_at_point (int x, int y, CoordType coords) const
| Gets the offset of the character located at coordinates x and y. More...
int | get_n_selections () const
| Gets the number of selected regions. More...
Glib::ustring | get_selection (int selection_num, int& start_offset, int& end_offset) const
| Gets the text from the specified selection. More...
bool | add_selection (int start_offset, int end_offset)
| Adds a selection bounded by the specified offsets. More...
bool | remove_selection (int selection_num)
| Removes the specified selection. More...
bool | set_selection (int selection_num, int start_offset, int end_offset)
| Changes the start and end offset of the specified selection. More...
bool | set_caret_offset (int offset)
| Sets the caret (cursor) position to the specified offset. More...
void | get_range_extents (int start_offset, int end_offset, CoordType coord_type, Rectangle& rect)
| Get the bounding box for text within the specified range. More...
AtkTextRange** | get_bounded_ranges (const Rectangle& rect, CoordType coord_type, TextClipType x_clip_type, TextClipType y_clip_type)
| Get the ranges of text in the specified bounding box. More...
Glib::SignalProxy2< void, int, int > | signal_text_changed ()
Glib::SignalProxy1< void, int > | signal_text_caret_moved ()
Glib::SignalProxy0< void > | signal_text_selection_changed ()
Glib::SignalProxy0< void > | signal_text_attributes_changed ()

## Static Public Member Functions
static GType | get_type ()
| Get the GType for this class, for use with the underlying GObject type system.

## Protected Member Functions
| Text ()
| You should derive from this class to use it.
virtual void | on_text_changed (int position, int length)
| This is a default handler for the signal signal_text_changed().
virtual void | on_text_caret_moved (int location)
| This is a default handler for the signal signal_text_caret_moved().
virtual void | on_text_selection_changed ()
| This is a default handler for the signal signal_text_selection_changed().
virtual void | on_text_attributes_changed ()
| This is a default handler for the signal signal_text_attributes_changed().

## Related Functions
(Note that these are not member functions.)
Glib::RefPtr< Atk::Text > | wrap (AtkText* object, bool take_copy=false)
| A Glib::wrap() method for this object. More...

## Detailed Description

The ATK interface implemented by components with text content.

This should be implemented by Atk::Objects on behalf of widgets that have text content which is either attributed or otherwise non-trivial. Atk::Objects whose text content is simple, unattributed, and very brief may expose that content via Atk::Object::get_name() instead; however if the text is editable, multi-line, typically longer than three or four words, attributed, selectable, or if the object already uses the 'name' ATK property for other information, this Text interface should be used to expose the text content. In the case of editable text content, Atk::EditableText (a subtype of the Atk::Text interface) should be implemented instead.

Atk::Text provides not only traversal facilities and change notification for text content, but also caret tracking and glyph bounding box calculations. Note that the text strings are exposed as UTF-8, and are therefore potentially multi-byte, and caret-to-byte offset mapping makes no assumptions about the character length; also bounding box glyph-to-offset mapping may be complex for languages which use ligatures.

## Member Function Documentation

bool Atk::Text::add_selection | ( | int | start_offset,
|  | int | end_offset
| ) |  |

Adds a selection bounded by the specified offsets.

Parameters

  start_offset | The start position of the selected region.
  end_offset | The offset of the first character after the selected region.

Returns
  `true` if success, `false` otherwise.

AtkTextRange** Atk::Text::get_bounded_ranges | ( | const Rectangle & | rect,
|  | CoordType | coord_type,
|  | TextClipType | x_clip_type,
|  | TextClipType | y_clip_type
| ) |  |

Get the ranges of text in the specified bounding box.

Since atkmm 1.3:

Parameters

  rect | An AtkTextRectagle giving the dimensions of the bounding box.
  coord_type | Specify whether coordinates are relative to the screen or widget window.
  x_clip_type | Specify the horizontal clip type.
  y_clip_type | Specify the vertical clip type.

Returns
  Array of AtkTextRange. The last element of the array returned by this function will be `0`.

int Atk::Text::get_caret_offset | ( |  | ) | const

Gets the offset position of the caret (cursor).

Returns
  The offset position of the caret (cursor).

gunichar Atk::Text::get_character_at_offset | ( | int | offset | ) | const

Gets the specified text.

Parameters

  offset | Position.

Returns
  The character at offset.

int Atk::Text::get_character_count | ( |  | ) | const

Gets the character count.

Returns
  The number of characters.

void Atk::Text::get_character_extents | ( | int | offset,
|  | int & | x,
|  | int & | y,
|  | int & | width,
|  | int & | height,
|  | CoordType | coords
| ) |  | const

Get the bounding box containing the glyph representing the character at a particular text offset.

Parameters

  offset | The offset of the text character for which bounding information is required.
  x | Pointer for the x cordinate of the bounding box.
  y | Pointer for the y cordinate of the bounding box.
  width | Pointer for the width of the bounding box.
  height | Pointer for the height of the bounding box.
  coords | Specify whether coordinates are relative to the screen or widget window.

AttributeSet Atk::Text::get_default_attributes | ( |  | ) | const

Creates an Atk::AttributeSet which consists of the default values of attributes for the text.

See the enum AtkTextAttribute for types of text attributes that can be returned. Note that other attributes may also be returned.

Returns
  An Atk::AttributeSet which contains the default values of attributes. at offset.

int Atk::Text::get_n_selections | ( |  | ) | const

Gets the number of selected regions.

Returns
  The number of selected regions, or -1 if a failure occurred.

int Atk::Text::get_offset_at_point | ( | int | x,
|  | int | y,
|  | CoordType | coords
| ) |  | const

Gets the offset of the character located at coordinates x and y.

x and y are interpreted as being relative to the screen or this widget's window depending on coords.

Parameters

  x | Screen x-position of character.
  y | Screen y-position of character.
  coords | Specify whether coordinates are relative to the screen or widget window.

Returns
  The offset to the character which is located at the specified x and y coordinates.

void Atk::Text::get_range_extents | ( | int | start_offset,
|  | int | end_offset,
|  | CoordType | coord_type,
|  | Rectangle & | rect
| ) |  |

Get the bounding box for text within the specified range.

Since atkmm 1.3:

Parameters

  start_offset | The offset of the first text character for which boundary information is required.
  end_offset | The offset of the text character after the last character for which boundary information is required.
  coord_type | Specify whether coordinates are relative to the screen or widget window.
  rect | A pointer to a AtkTextRectangle which is filled in by this function.

AttributeSet Atk::Text::get_run_attributes | ( | int | offset,
|  | int & | start_offset,
|  | int & | end_offset
| ) |  | const

Creates an Atk::AttributeSet which consists of the attributes explicitly set at the position offset in the text.

start_offset and end_offset are set to the start and end of the range around offset where the attributes are invariant. See the enum AtkTextAttribute for types of text attributes that can be returned. Note that other attributes may also be returned.

Parameters

  offset | The offset at which to get the attributes.
  start_offset | The address to put the start offset of the range.
  end_offset | The address to put the end offset of the range.

Returns
  An Atk::AttributeSet which contains the attributes explicitly set at offset.

Glib::ustring Atk::Text::get_selection | ( | int | selection_num,
|  | int & | start_offset,
|  | int & | end_offset
| ) |  | const

Gets the text from the specified selection.

Parameters

  selection_num | The selection number. The selected regions are assigned numbers that correspond to how far the region is from the start of the text. The selected region closest to the beginning of the text region is assigned the number 0, etc. Note that adding, moving or deleting a selected region can change the numbering.
  start_offset | Passes back the start position of the selected region.
  end_offset | Passes back the end position of (e.g. offset immediately past) the selected region.

Returns
  The selected text.

Glib::ustring Atk::Text::get_text | ( | int | start_offset,
|  | int | end_offset
| ) |  | const

Gets the specified text.

Parameters

  start_offset | Start position.
  end_offset | End position.

Returns
  The text from start_offset up to, but not including end_offset.

Glib::ustring Atk::Text::get_text_after_offset | ( | int | offset,
|  | TextBoundary | boundary_type,
|  | int & | start_offset,
|  | int & | end_offset
| ) |  | const

Gets the specified text.

If the boundary_type if ATK_TEXT_BOUNDARY_CHAR the character after the offset is returned.

If the boundary_type is ATK_TEXT_BOUNDARY_WORD_START the returned string is from the word start after the offset to the next word start.

The returned string will contain the word after the offset if the offset is inside a word or if the offset is not inside a word.

If the boundary_type is ATK_TEXT_BOUNDARY_WORD_END the returned string is from the word end at or after the offset to the next work end.

The returned string will contain the word after the offset if the offset is inside a word and will contain the word after the word after the offset if the offset is not inside a word.

If the boundary type is ATK_TEXT_BOUNDARY_SENTENCE_START the returned string is from the sentence start after the offset to the next sentence start.

The returned string will contain the sentence after the offset if the offset is inside a sentence or if the offset is not inside a sentence.

If the boundary_type is ATK_TEXT_BOUNDARY_SENTENCE_END the returned string is from the sentence end at or after the offset to the next sentence end.

The returned string will contain the sentence after the offset if the offset is inside a sentence and will contain the sentence after the sentence after the offset if the offset is not inside a sentence.

If the boundary type is ATK_TEXT_BOUNDARY_LINE_START the returned string is from the line start after the offset to the next line start.

If the boundary_type is ATK_TEXT_BOUNDARY_LINE_END the returned string is from the line end at or after the offset to the next line start.

Parameters

  offset | Position.
  boundary_type | An Atk::TextBoundary.
  start_offset | The start offset of the returned string.
  end_offset | The offset of the first character after the returned substring.

Returns
  The text after offset bounded by the specified boundary_type.

Glib::ustring Atk::Text::get_text_at_offset | ( | int | offset,
|  | TextBoundary | boundary_type,
|  | int & | start_offset,
|  | int & | end_offset
| ) |  | const

Gets the specified text.

If the boundary_type if ATK_TEXT_BOUNDARY_CHAR the character at the offset is returned.

If the boundary_type is ATK_TEXT_BOUNDARY_WORD_START the returned string is from the word start at or before the offset to the word start after the offset.

The returned string will contain the word at the offset if the offset is inside a word and will contain the word before the offset if the offset is not inside a word.

If the boundary_type is ATK_TEXT_BOUNDARY_WORD_END the returned string is from the word end before the offset to the word end at or after the offset.

The returned string will contain the word at the offset if the offset is inside a word and will contain the word after to the offset if the offset is not inside a word.

If the boundary type is ATK_TEXT_BOUNDARY_SENTENCE_START the returned string is from the sentence start at or before the offset to the sentence start after the offset.

The returned string will contain the sentence at the offset if the offset is inside a sentence and will contain the sentence before the offset if the offset is not inside a sentence.

If the boundary_type is ATK_TEXT_BOUNDARY_SENTENCE_END the returned string is from the sentence end before the offset to the sentence end at or after the offset.

The returned string will contain the sentence at the offset if the offset is inside a sentence and will contain the sentence after the offset if the offset is not inside a sentence.

If the boundary type is ATK_TEXT_BOUNDARY_LINE_START the returned string is from the line start at or before the offset to the line start after the offset.

If the boundary_type is ATK_TEXT_BOUNDARY_LINE_END the returned string is from the line end before the offset to the line end at or after the offset.

Parameters

  offset | Position.
  boundary_type | An Atk::TextBoundary.
  start_offset | The start offset of the returned string.
  end_offset | The offset of the first character after the returned substring.

Returns
  The text at offset bounded by the specified boundary_type.

Glib::ustring Atk::Text::get_text_before_offset | ( | int | offset,
|  | TextBoundary | boundary_type,
|  | int & | start_offset,
|  | int & | end_offset
| ) |  | const

Gets the specified text.

If the boundary_type if ATK_TEXT_BOUNDARY_CHAR the character before the offset is returned.

If the boundary_type is ATK_TEXT_BOUNDARY_WORD_START the returned string is from the word start before the word start before the offset to the word start before the offset.

The returned string will contain the word before the offset if the offset is inside a word and will contain the word before the word before the offset if the offset is not inside a word.

If the boundary_type is ATK_TEXT_BOUNDARY_WORD_END the returned string is from the word end before the word end at or before the offset to the word end at or before the offset.

The returned string will contain the word before the offset if the offset is inside a word or if the offset is not inside a word.

If the boundary type is ATK_TEXT_BOUNDARY_SENTENCE_START the returned string is from the sentence start before the sentence start before the offset to the sentence start before the offset.

The returned string will contain the sentence before the offset if the offset is inside a sentence and will contain the sentence before the sentence before the offset if the offset is not inside a sentence.

If the boundary_type is ATK_TEXT_BOUNDARY_SENTENCE_END the returned string is from the sentence end before the sentence end at or before the offset to the sentence end at or before the offset.

The returned string will contain the sentence before the offset if the offset is inside a sentence or if the offset is not inside a sentence.

If the boundary type is ATK_TEXT_BOUNDARY_LINE_START the returned string is from the line start before the line start ar or before the offset to the line start ar or before the offset.

If the boundary_type is ATK_TEXT_BOUNDARY_LINE_END the returned string is from the line end before the line end before the offset to the line end before the offset.

Parameters

  offset | Position.
  boundary_type | An Atk::TextBoundary.
  start_offset | The start offset of the returned string.
  end_offset | The offset of the first character after the returned substring.

Returns
  The text before offset bounded by the specified boundary_type.

bool Atk::Text::remove_selection | ( | int | selection_num | ) |

Removes the specified selection.

Parameters

  selection_num | The selection number. The selected regions are assigned numbers that correspond to how far the region is from the start of the text. The selected region closest to the beginning of the text region is assigned the number 0, etc. Note that adding, moving or deleting a selected region can change the numbering.

Returns
  `true` if success, `false` otherwise.

bool Atk::Text::set_caret_offset | ( | int | offset | ) |

Sets the caret (cursor) position to the specified offset.

Parameters

  offset | Position.

Returns
  `true` if success, `false` otherwise.

bool Atk::Text::set_selection | ( | int | selection_num,
|  | int | start_offset,
|  | int | end_offset
| ) |  |

Changes the start and end offset of the specified selection.

Parameters

  selection_num | The selection number. The selected regions are assigned numbers that correspond to how far the region is from the start of the text. The selected region closest to the beginning of the text region is assigned the number 0, etc. Note that adding, moving or deleting a selected region can change the numbering.
  start_offset | The new start position of the selection.
  end_offset | The new end position of (e.g. offset immediately past) the selection.

Returns
  `true` if success, `false` otherwise.

Glib::SignalProxy0< void > Atk::Text::signal_text_attributes_changed | ( |  | ) |

Slot Prototype:
  `void on_my_text_attributes_changed()`

Glib::SignalProxy1< void,int > Atk::Text::signal_text_caret_moved | ( |  | ) |

Slot Prototype:
  `void on_my_text_caret_moved(int location)`

Glib::SignalProxy2< void,int,int > Atk::Text::signal_text_changed | ( |  | ) |

Slot Prototype:
  `void on_my_text_changed(int position, int length)`

Glib::SignalProxy0< void > Atk::Text::signal_text_selection_changed | ( |  | ) |

Slot Prototype:
  `void on_my_text_selection_changed()`

## Friends And Related Function Documentation

Glib::RefPtr< Atk::Text > wrap | ( | AtkText * | object,
|  | bool | take_copy = `false`
| ) |  |
| related

A Glib::wrap() method for this object.

Parameters

  object | The C instance.
  take_copy | False if the result should take ownership of the C instance. True if it should take a new copy or ref.

Returns
  A C++ instance that wraps this C instance.