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ATK - Accessibility Toolkit | |
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AtkText;
enum AtkTextBoundary;
enum AtkTextClipType;
AtkTextRange;
AtkTextRectangle;
AtkAttribute;
typedef AtkAttributeSet;
enum AtkTextAttribute;
gchar* atk_text_get_text (AtkText *text,
gint start_offset,
gint end_offset);
gunichar atk_text_get_character_at_offset (AtkText *text,
gint offset);
gchar* atk_text_get_text_after_offset (AtkText *text,
gint offset,
AtkTextBoundary boundary_type,
gint *start_offset,
gint *end_offset);
gchar* atk_text_get_text_at_offset (AtkText *text,
gint offset,
AtkTextBoundary boundary_type,
gint *start_offset,
gint *end_offset);
gchar* atk_text_get_text_before_offset (AtkText *text,
gint offset,
AtkTextBoundary boundary_type,
gint *start_offset,
gint *end_offset);
gint atk_text_get_caret_offset (AtkText *text);
void atk_text_get_character_extents (AtkText *text,
gint offset,
gint *x,
gint *y,
gint *width,
gint *height,
AtkCoordType coords);
AtkAttributeSet* atk_text_get_run_attributes (AtkText *text,
gint offset,
gint *start_offset,
gint *end_offset);
AtkAttributeSet* atk_text_get_default_attributes (AtkText *text);
gint atk_text_get_character_count (AtkText *text);
gint atk_text_get_offset_at_point (AtkText *text,
gint x,
gint y,
AtkCoordType coords);
AtkTextRange** atk_text_get_bounded_ranges (AtkText *text,
AtkTextRectangle *rect,
AtkCoordType coord_type,
AtkTextClipType x_clip_type,
AtkTextClipType y_clip_type);
void atk_text_get_range_extents (AtkText *text,
gint start_offset,
gint end_offset,
AtkCoordType coord_type,
AtkTextRectangle *rect);
void atk_text_free_ranges (AtkTextRange **ranges);
gint atk_text_get_n_selections (AtkText *text);
gchar* atk_text_get_selection (AtkText *text,
gint selection_num,
gint *start_offset,
gint *end_offset);
gboolean atk_text_add_selection (AtkText *text,
gint start_offset,
gint end_offset);
gboolean atk_text_remove_selection (AtkText *text,
gint selection_num);
gboolean atk_text_set_selection (AtkText *text,
gint selection_num,
gint start_offset,
gint end_offset);
gboolean atk_text_set_caret_offset (AtkText *text,
gint offset);
void atk_attribute_set_free (AtkAttributeSet *attrib_set);
AtkTextAttribute atk_text_attribute_register (const gchar *name);
const gchar* atk_text_attribute_get_name (AtkTextAttribute attr);
AtkTextAttribute atk_text_attribute_for_name (const gchar *name);
const gchar* atk_text_attribute_get_value (AtkTextAttribute attr,
gint index_);
"text-attributes-changed" : Run Last "text-caret-moved" : Run Last "text-changed" : Run Last / Has Details "text-selection-changed" : Run Last
AtkText should be implemented by AtkObjects on behalf of widgets that have text content which is either attributed or otherwise non-trivial. AtkObjects 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, the AtkText interface should be used to expose the text content. In the case of editable text content, AtkEditableText (a subtype of the AtkText interface) should be implemented instead.
AtkText 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.
typedef enum {
ATK_TEXT_BOUNDARY_CHAR,
ATK_TEXT_BOUNDARY_WORD_START,
ATK_TEXT_BOUNDARY_WORD_END,
ATK_TEXT_BOUNDARY_SENTENCE_START,
ATK_TEXT_BOUNDARY_SENTENCE_END,
ATK_TEXT_BOUNDARY_LINE_START,
ATK_TEXT_BOUNDARY_LINE_END
} AtkTextBoundary;
Text boundary types used for specifying boundaries for regions of text
| Boundary is the boundary between characters (including non-printing characters) | |
| Boundary is the start (i.e. first character) of a word. | |
| Boundary is the end (i.e. last character) of a word. | |
| Boundary is the first character in a sentence. | |
| Boundary is the last (terminal) character in a sentence; in languages which use "sentence stop" punctuation such as English, the boundary is thus the '.', '?', or similar terminal punctuation character. | |
| Boundary is the initial character of the content or a character immediately following a newline, linefeed, or return character. | |
| Boundary is the linefeed, or return character. |
typedef enum {
ATK_TEXT_CLIP_NONE,
ATK_TEXT_CLIP_MIN,
ATK_TEXT_CLIP_MAX,
ATK_TEXT_CLIP_BOTH
} AtkTextClipType;
Describes the type of clipping required.
typedef struct {
AtkTextRectangle bounds;
gint start_offset;
gint end_offset;
gchar* content;
} AtkTextRange;
A structure used to describe a text range.
AtkTextRectangle |
A rectangle giving the bounds of the text range |
gint |
The start offset of a AtkTextRange |
gint |
The end offset of a AtkTextRange |
gchar * |
The text in the text range |
typedef struct {
gint x;
gint y;
gint width;
gint height;
} AtkTextRectangle;
A structure used to store a rectangle used by AtkText.
typedef struct {
gchar* name;
gchar* value;
} AtkAttribute;
A string name/value pair representing a text attribute.
typedef GSList AtkAttributeSet;
This is a singly-linked list (a GSList) of AtkAttribute. It is
used by atk_text_get_run_attributes(), atk_text_get_default_attributes()
and atk_editable_text_set_run_attributes()
typedef enum
{
ATK_TEXT_ATTR_INVALID = 0,
ATK_TEXT_ATTR_LEFT_MARGIN,
ATK_TEXT_ATTR_RIGHT_MARGIN,
ATK_TEXT_ATTR_INDENT,
ATK_TEXT_ATTR_INVISIBLE,
ATK_TEXT_ATTR_EDITABLE,
ATK_TEXT_ATTR_PIXELS_ABOVE_LINES,
ATK_TEXT_ATTR_PIXELS_BELOW_LINES,
ATK_TEXT_ATTR_PIXELS_INSIDE_WRAP,
ATK_TEXT_ATTR_BG_FULL_HEIGHT,
ATK_TEXT_ATTR_RISE,
ATK_TEXT_ATTR_UNDERLINE,
ATK_TEXT_ATTR_STRIKETHROUGH,
ATK_TEXT_ATTR_SIZE,
ATK_TEXT_ATTR_SCALE,
ATK_TEXT_ATTR_WEIGHT,
ATK_TEXT_ATTR_LANGUAGE,
ATK_TEXT_ATTR_FAMILY_NAME,
ATK_TEXT_ATTR_BG_COLOR,
ATK_TEXT_ATTR_FG_COLOR,
ATK_TEXT_ATTR_BG_STIPPLE,
ATK_TEXT_ATTR_FG_STIPPLE,
ATK_TEXT_ATTR_WRAP_MODE,
ATK_TEXT_ATTR_DIRECTION,
ATK_TEXT_ATTR_JUSTIFICATION,
ATK_TEXT_ATTR_STRETCH,
ATK_TEXT_ATTR_VARIANT,
ATK_TEXT_ATTR_STYLE,
ATK_TEXT_ATTR_LAST_DEFINED
} AtkTextAttribute;
Describes the text attributes supported
| Invalid attribute | |
| The pixel width of the left margin | |
| The pixel width of the right margin | |
| The number of pixels that the text is indented | |
| Either "true" or "false" indicating whether text is visible or not | |
| Either "true" or "false" indicating whether text is editable or not | |
| Pixels of blank space to leave above each newline-terminated line. | |
| Pixels of blank space to leave below each newline-terminated line. | |
| Pixels of blank space to leave between wrapped lines inside the same newline-terminated line (paragraph). | |
| "true" or "false" whether to make the background color for each character the height of the highest font used on the current line, or the height of the font used for the current character. | |
| Number of pixels that the characters are risen above the baseline | |
| "none", "single", "double" or "low" | |
| "true" or "false" whether the text is strikethrough | |
| The size of the characters. | |
| The scale of the characters. The value is a string representation of a double | |
| The weight of the characters. | |
| The language used | |
| The font family name | |
The background color. The value is an RGB value of the format "u,u,u"
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The foreground color. The value is an RGB value of the format "u,u,u"
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| "true" if a GdkBitmap is set for stippling the background color. | |
| "true" if a GdkBitmap is set for stippling the foreground color. | |
| The wrap mode of the text, if any. Values are "none", "char" or "word" | |
| The direction of the text, if set. Values are "none", "ltr" or "rtl" | |
| The justification of the text, if set. Values are "left", "right", "center" or "fill" | |
| The stretch of the text, if set. Values are "ultra_condensed", "extra_condensed", "condensed", "semi_condensed", "normal", "semi_expanded", "expanded", "extra_expanded" or "ultra_expanded" | |
| The capitalization variant of the text, if set. Values are "normal" or "small_caps" | |
| The slant style of the text, if set. Values are "normal", "oblique" or "italic" | |
| not a valid text attribute, used for finding end of enumeration |
gchar* atk_text_get_text (AtkText *text, gint start_offset, gint end_offset);
Gets the specified text.
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an AtkText |
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start position |
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end position |
Returns : |
the text from start_offset up to, but not including end_offset.
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gunichar atk_text_get_character_at_offset (AtkText *text, gint offset);
Gets the specified text.
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an AtkText |
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position |
Returns : |
the character at offset.
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gchar* atk_text_get_text_after_offset (AtkText *text, gint offset, AtkTextBoundary boundary_type, gint *start_offset, gint *end_offset);
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.
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an AtkText |
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position |
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An AtkTextBoundary |
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the start offset of the returned string |
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the offset of the first character after the returned substring |
Returns : |
the text after offset bounded by the specified boundary_type.
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gchar* atk_text_get_text_at_offset (AtkText *text, gint offset, AtkTextBoundary boundary_type, gint *start_offset, gint *end_offset);
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.
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an AtkText |
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position |
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An AtkTextBoundary |
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the start offset of the returned string |
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the offset of the first character after the returned substring |
Returns : |
the text at offset bounded by the specified boundary_type.
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gchar* atk_text_get_text_before_offset (AtkText *text, gint offset, AtkTextBoundary boundary_type, gint *start_offset, gint *end_offset);
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.
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an AtkText |
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position |
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An AtkTextBoundary |
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the start offset of the returned string |
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the offset of the first character after the returned substring |
Returns : |
the text before offset bounded by the specified boundary_type.
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gint atk_text_get_caret_offset (AtkText *text);
Gets the offset position of the caret (cursor).
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an AtkText |
Returns : |
the offset position of the caret (cursor). |
void atk_text_get_character_extents (AtkText *text, gint offset, gint *x, gint *y, gint *width, gint *height, AtkCoordType coords);
Get the bounding box containing the glyph representing the character at a particular text offset.
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an AtkText |
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The offset of the text character for which bounding information is required. |
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Pointer for the x cordinate of the bounding box |
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Pointer for the y cordinate of the bounding box |
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Pointer for the width of the bounding box |
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Pointer for the height of the bounding box |
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specify whether coordinates are relative to the screen or widget window |
AtkAttributeSet* atk_text_get_run_attributes (AtkText *text, gint offset, gint *start_offset, gint *end_offset);
Creates an AtkAttributeSet 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. Note that end_offset is the offset of the first character
after the range. See the enum AtkTextAttribute for types of text
attributes that can be returned. Note that other attributes may also be
returned.
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an AtkText |
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the offset at which to get the attributes |
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the address to put the start offset of the range |
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the address to put the end offset of the range |
Returns : |
an AtkAttributeSet which contains the attributes explicitly set
at offset. This AtkAttributeSet should be freed by a call to
atk_attribute_set_free().
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AtkAttributeSet* atk_text_get_default_attributes (AtkText *text);
Creates an AtkAttributeSet 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.
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an AtkText |
Returns : |
an AtkAttributeSet which contains the default values of attributes.
at offset. This AtkAttributeSet should be freed by a call to
atk_attribute_set_free().
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gint atk_text_get_character_count (AtkText *text);
Gets the character count.
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an AtkText |
Returns : |
the number of characters. |
gint atk_text_get_offset_at_point (AtkText *text, gint x, gint y, AtkCoordType coords);
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.
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an AtkText |
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screen x-position of character |
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screen y-position of character |
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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.
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AtkTextRange** atk_text_get_bounded_ranges (AtkText *text, AtkTextRectangle *rect, AtkCoordType coord_type, AtkTextClipType x_clip_type, AtkTextClipType y_clip_type);
Get the ranges of text in the specified bounding box.
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an AtkText |
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An AtkTextRectagle giving the dimensions of the bounding box. |
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Specify whether coordinates are relative to the screen or widget window. |
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Specify the horizontal clip type. |
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Specify the vertical clip type. |
Returns : |
Array of AtkTextRange. The last element of the array returned by this function will be NULL. |
Since ATK 1.3
void atk_text_get_range_extents (AtkText *text, gint start_offset, gint end_offset, AtkCoordType coord_type, AtkTextRectangle *rect);
Get the bounding box for text within the specified range.
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an AtkText |
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The offset of the first text character for which boundary information is required. |
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The offset of the text character after the last character for which boundary information is required. |
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Specify whether coordinates are relative to the screen or widget window. |
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A pointer to a AtkTextRectangle which is filled in by this function. |
Since ATK 1.3
void atk_text_free_ranges (AtkTextRange **ranges);
Frees the memory associated with an array of AtkTextRange. It is assumed that the array was returned by the function atk_text_get_bounded_ranges and is NULL terminated.
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A pointer to an array of AtkTextRange which is to be freed. |
Since ATK 1.3
gint atk_text_get_n_selections (AtkText *text);
Gets the number of selected regions.
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an AtkText |
Returns : |
The number of selected regions, or -1 if a failure occurred. |
gchar* atk_text_get_selection (AtkText *text, gint selection_num, gint *start_offset, gint *end_offset);
Gets the text from the specified selection.
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an AtkText |
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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. |
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passes back the start position of the selected region |
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passes back the end position of (e.g. offset immediately past) the selected region |
Returns : |
the selected text. |
gboolean atk_text_add_selection (AtkText *text, gint start_offset, gint end_offset);
Adds a selection bounded by the specified offsets.
gboolean atk_text_remove_selection (AtkText *text, gint selection_num);
Removes the specified selection.
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an AtkText |
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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
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gboolean atk_text_set_selection (AtkText *text, gint selection_num, gint start_offset, gint end_offset);
Changes the start and end offset of the specified selection.
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an AtkText |
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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. |
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the new start position of the selection |
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the new end position of (e.g. offset immediately past) the selection |
Returns : |
TRUE if success, FALSE otherwise
|
gboolean atk_text_set_caret_offset (AtkText *text, gint offset);
Sets the caret (cursor) position to the specified offset.
void atk_attribute_set_free (AtkAttributeSet *attrib_set);
Frees the memory used by an AtkAttributeSet, including all its AtkAttributes.
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The AtkAttributeSet to free |
AtkTextAttribute atk_text_attribute_register (const gchar *name);
Associate name with a new AtkTextAttribute
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a name string |
Returns : |
an AtkTextAttribute associated with name
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const gchar* atk_text_attribute_get_name (AtkTextAttribute attr);
Gets the name corresponding to the AtkTextAttribute
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The AtkTextAttribute whose name is required |
Returns : |
a string containing the name; this string should not be freed |
AtkTextAttribute atk_text_attribute_for_name (const gchar *name);
Get the AtkTextAttribute type corresponding to a text attribute name.
|
a string which is the (non-localized) name of an ATK text attribute. |
Returns : |
the AtkTextAttribute enumerated type corresponding to the specified name, or ATK_TEXT_ATTRIBUTE_INVALID if no matching text attribute is found. |
const gchar* atk_text_attribute_get_value (AtkTextAttribute attr, gint index_);
Gets the value for the index of the AtkTextAttribute
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The AtkTextAttribute for which a value is required |
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The index of the required value |
Returns : |
a string containing the value; this string should not be freed; NULL is returned if there are no values maintained for the attr value. |
"text-attributes-changed" signalvoid user_function (AtkText *atktext, gpointer user_data) : Run Last
The "text-attributes-changed" signal is emitted when the text attributes of the text of an object which implements AtkText changes.
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the object which received the signal. |
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user data set when the signal handler was connected. |
"text-caret-moved" signalvoid user_function (AtkText *atktext, gint arg1, gpointer user_data) : Run Last
The "text-caret-moved" signal is emitted when the caret position of the text of an object which implements AtkText changes.
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the object which received the signal. |
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The new position of the text caret. |
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user data set when the signal handler was connected. |
"text-changed" signalvoid user_function (AtkText *atktext, gint arg1, gint arg2, gpointer user_data) : Run Last / Has Details
The "text-changed" signal is emitted when the text of the object which implements the AtkText interface changes, This signal will have a detail which is either "insert" or "delete" which identifies whether the text change was an insertion or a deletion
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the object which received the signal. |
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The position (character offset) of the insertion or deletion. |
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The length (in characters) of text inserted or deleted. |
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user data set when the signal handler was connected. |
"text-selection-changed" signalvoid user_function (AtkText *atktext, gpointer user_data) : Run Last
The "text-selection-changed" signal is emitted when the selected text of an object which implements AtkText changes.
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the object which received the signal. |
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user data set when the signal handler was connected. |