Prima::Edit - standard text editing widget
use Prima::Edit; my $e = Prima::Edit-> create( text => 'Hello $world', syntaxHilite => 1, ); $e-> selection( 1, 1, 1, 2);
The class provides text editing capabilities, three types of selection, text wrapping, syntax highlighting, auto indenting, undo and redo function, search and replace methods.
The module declares
bt:: package, that contains integer constants for selection block type, used by blockType property.
The class addresses the text space by (X,Y)-coordinates, where X is character offset and Y is line number. The addressing can be 'physical' and 'logical', - in logical case Y is number of line of text. The difference can be observed if wordWrap property is set to 1, when a single text string can be shown as several sub-strings, called chunks.
All keyboard events, except the character input and tab key handling, are processed by the accelerator table ( see Prima::Menu ). The default
accelItems table defines names, keyboard combinations, and the corresponding actions to the class functions. The class does not provide functionality to change these mappings. To do so, consult "Prima::AccelTable" in Prima::Menu.
- ParseSyntax TEXT, RESULT_ARRAY_REF
Called when syntax highlighting is requires - TEXT is a string to be parsed, and the parsing results to be stored in RESULT_ARRAY_REF, which is a reference to an array of integer pairs, each representing a single-colored text chunk. The first integer in the pairs is the length of a chunk, the second - color value (
- autoIndent BOOLEAN
Selects if the auto indenting feature is on.
Default value: 1
- blockType INTEGER
Defines type of selection block. Can be one of the following constants:
Normal block, where the first and the last line of the selection can be partial, and the lines between occupy the whole line. CUA stands for 'common user access'.
Default keys: Shift + arrow keys
See also: cursor_shift_key
Rectangular block, where all selected lines are of same offsets and lengths.
Default key: Alt+B
See also: mark_vertical
Rectangular block, where the selection occupies the whole line.
Default key: Alt+L
See also: mark_horizontal
- cursor X, Y
Selects physical position of the cursor
- cursorX X
Selects physical horizontal position of the cursor
- cursorY Y
Selects physical vertical position of the cursor
- cursorWrap BOOLEAN
Selects cursor behavior when moved horizontally outside the line. If 0, the cursor is not moved. If 1, the cursor moved to the adjacent line.
- insertMode BOOLEAN
Governs the typing mode - if 1, the typed text is inserted, if 0, the text overwrites the old text. When
insertModeis 0, the cursor shape is thick and covers the whole character; when 1, it is of default width.
Default toggle key: Insert
- hiliteNumbers COLOR
Selects the color for number highlighting
- hiliteQStrings COLOR
Selects the color for highlighting the single-quoted strings
- hiliteQQStrings COLOR
Selects the color for highlighting the double-quoted strings
- hiliteIDs ARRAY
Array of scalar pairs, that define words to be highlighted. The first item in the pair is an array of words; the second item is a color value.
- hiliteChars ARRAY
Array of scalar pairs, that define characters to be highlighted. The first item in the pair is a string of characters; the second item is a color value.
- hiliteREs ARRAY
Array of scalar pairs, that define character patterns to be highlighted. The first item in the pair is a perl regular expression; the second item is a color value.
- mark MARK [ BLOCK_TYPE ]
Selects block marking state. If MARK is 1, starts the block marking, if 0 - stops the block marking. When MARK is 1, BLOCK_TYPE can be used to set the selection type (
bt::XXXconstants ). If BLOCK_TYPE is unset the value of blockType is used.
- markers ARRAY
Array of arrays with integer pairs, X and Y, where each represents a physical coordinates in text. Used as anchor storage for fast navigation.
- modified BOOLEAN
A boolean flag that shows if the text was modified. Can be used externally, to check if the text is to be saved to a file, for example.
- offset INTEGER
Horizontal offset of text lines in pixels.
- persistentBlock BOOLEAN
Selects whether the selection is cancelled as soon as the cursor is moved ( 0 ) or it persists until the selection is explicitly changed ( 1 ).
Default value: 0
- readOnly BOOLEAN
If 1, no user input is accepted.
- selection X1, Y1, X2, Y2
Accepts two pair of coordinates, ( X1,Y1) the beginning and ( X2,Y2) the end of new selection, and sets the block according to blockType property.
The selection is null if X1 equals to X2 and Y1 equals to Y2. has_selection method returns 1 if the selection is non-null.
- selStart X, Y
Manages the selection start. See selection, X1 and Y1.
- selEnd X, Y
Manages the selection end. See selection, X2 and Y2.
- syntaxHilite BOOLEAN
Governs the syntax highlighting. Is not implemented for word wrapping mode.
- tabIndent INTEGER
Maps tab ( \t ) key to
tabIndentamount of space characters.
- text TEXT
Provides access to all the text data. The lines are separated by the new line ( \n ) character.
See also: textRef.
- textRef TEXT_PTR
Provides access to all the text data. The lines are separated by the new line ( \n ) character. TEXT_PTR is a pointer to text string.
The property is more efficient than text with the large text, because the copying of the text scalar to the stack stage is eliminated.
See also: text.
- topLine INTEGER
Selects the first line of the text drawn.
- undoLimit INTEGER
Sets limit on number of stored atomic undo operations. If 0, undo is disabled.
Default value: 1000
- wantTabs BOOLEAN
Selects the way the tab ( \t ) character is recognized in the user input. If 1, it is recognized by the Tab key; however, this disallows the toolkit widget tab-driven navigation. If 0, the tab character can be entered by pressing Ctrl+Tab key combination.
Default value: 0
- wantReturns BOOLEAN
Selects the way the new line ( \n ) character is recognized in the user input. If 1, it is recognized by the Enter key; however, this disallows the toolkit default button activation. If 0, the new line character can be entered by pressing Ctrl+Enter key combination.
Default value: 1
- wordDelimiters STRING
Contains string of character that are used for locating a word break. Default STRING value consists of punctuation marks, space and tab characters, and
- wordWrap BOOLEAN
Selects whether the long lines are wrapped, or can be positioned outside the horizontal widget inferior borders. If 1, syntaxHilite is not used. A line of text can be represented by more than one line of screen text ( chunk ) . To access the text chunk-wise, use get_chunk method.
- add_marker X, Y
Adds physical coordinated X,Y to markers property.
- back_char [ REPEAT = 1 ]
Removes REPEAT times a character left to the cursor. If the cursor is on 0 x-position, removes the new-line character and concatenates the lines.
Default key: Backspace
Opens bracket for group of actions, undone as single operation. The bracket is closed by calling
Removes the selection block
Default key: Alt+U
Returns 1 if the logical locking is on, 0 if it is off.
See also lock_change.
Copies the selected text, if any, to the clipboard.
Default key: Ctrl+Insert
Copies the selected text and inserts it into the cursor position, according to the blockType value.
Default key: Alt+C
Moves cursor to the bottom line
Default key: Ctrl+End
Moves cursor to the top line
Default key: Ctrl+Home
Default key: Ctrl+PageDown
Moves cursor to the end of text.
Moves cursor to the beginning of text.
Default key: Ctrl+PageUp
- cursor_down [ REPEAT = 1 ]
Moves cursor REPEAT times down
Default key: Down
Moves cursor to the end of the line
Default key: End
Moves cursor to the beginning of the line
Default key: Home
- cursor_left [ REPEAT = 1 ]
Moves cursor REPEAT times left
Default key: Left
- cursor_right [ REPEAT = 1 ]
Moves cursor REPEAT times right
Default key: Right
- cursor_up [ REPEAT = 1 ]
Moves cursor REPEAT times up
Default key: Up
- cursor_pgdn [ REPEAT = 1 ]
Moves cursor REPEAT pages down
Default key: PageDown
- cursor_pgup [ REPEAT = 1 ]
Moves cursor REPEAT pages up
Default key: PageUp
- cursor_shift_key [ ACCEL_TABLE_ITEM ]
Performs action of the cursor movement, bound to ACCEL_TABLE_ITEM action ( defined in
accelItemsproperty ), and extends the selection block along the cursor movement. Not called directly.
Cuts the selected text into the clipboard.
Default key: Shift+Delete
Removes the selected text.
Default key: Alt+D
- delete_char [ REPEAT = 1 ]
Delete REPEAT characters from the cursor position
Default key: Delete
- delete_line LINE_ID, [ LINES = 1 ]
Removes LINES of text at LINE_ID.
Removes the chunk ( or line, if wordWrap is 0 ) at the cursor.
Default key: Ctrl+Y
- delete_chunk CHUNK_ID, [ CHUNKS = 1 ]
Removes CHUNKS ( or lines, if wordWrap is 0 ) of text at CHUNK_ID
- delete_marker INDEX
Removes marker INDEX in markers list.
Removes text to the end of the chunk.
Default key: Ctrl+E
- delete_text X, Y, TEXT_LENGTH
Removes TEXT_LENGTH characters at X,Y physical coordinates
- draw_colorchunk CANVAS, TEXT, LINE_ID, X, Y, COLOR
Paints the syntax-highlighted chunk of TEXT, taken from LINE_ID line index, at X, Y. COLOR is used if the syntax highlighting information contains
cl::Foreas color reference.
Stops the block selection session.
Closes bracket for group of actions, opened by
- find SEARCH_STRING, [ X = 0, Y = 0, REPLACE_LINE = '', OPTIONS ]
Tries to find ( and, if REPLACE_LINE is defined, to replace with it ) SEARCH_STRING from (X,Y) physical coordinates. OPTIONS is an integer that consists of the
fdo::constants; the same constants are used in Prima::EditDialog, which provides graphic interface to the find and replace facilities of Prima::Edit.
If set, the search is case-sensitive.
If set, SEARCH_STRING must constitute the whole word.
If set, SEARCH_STRING is a regular expression.
If set, the search direction is backwards.
Not used in the class, however, used in Prima::EditDialog.
- get_chunk CHUNK_ID
Returns chunk of text, located at CHUNK_ID. Returns empty string if chunk is nonexistent.
- get_chunk_end CHUNK_ID
Returns the index of chunk at CHUNK_ID, corresponding to the last chunk of same line.
- get_chunk_org CHUNK_ID
Returns the index of chunk at CHUNK_ID, corresponding to the first chunk of same line.
- get_chunk_width TEXT, FROM, LENGTH, [ RETURN_TEXT_PTR ]
Returns the width in pixels of
substr( TEXT, FROM, LENGTH). If FROM is larger than length of TEXT, TEXT is padded with space characters. Tab character in TEXT replaced to tabIndent times space character. If RETURN_TEXT_PTR pointer is specified, the converted TEXT is stored there.
- get_line INDEX
Returns line of text, located at INDEX. Returns empty string if line is nonexistent.
- get_line_dimension INDEX
Returns two integers, representing the line at INDEX in wordWrap mode: the first value is the corresponding chunk index, the second is how many chunks represent the line.
See also: make_logical.
- get_line_ext CHUNK_ID
Returns the line, corresponding to the chunk index.
Return the text currently selected.
Returns boolean value, indicating if the selection block is active.
- insert_empty_line LINE_ID, [ REPEAT = 1 ]
Inserts REPEAT empty lines at LINE_ID.
- insert_line LINE_ID, @TEXT
Inserts @TEXT strings at LINE_ID
- insert_text TEXT, [ HIGHLIGHT = 0 ]
Inserts TEXT at the cursor position. If HIGHLIGHT is set to 1, the selection block is cancelled and the newly inserted text is selected.
- lock_change BOOLEAN
Increments ( 1 ) or decrements ( 0 ) lock count. Used to defer change notification in multi-change calls. When internal lock count hits zero,
Changenotification is called.
- make_logical X, Y
Maps logical X,Y coordinates to the physical and returns the integer pair. Returns same values when wordWrap is 0.
- make_physical X, Y
Maps physical X,Y coordinates to the logical and returns the integer pair.
Returns same values when wordWrap is 0.
Starts block marking session with
Default key: Alt+L
Starts block marking session with
Default key: Alt+B
Copies the selected text and overwrites the text next to the cursor position, according to the blockType value.
Default key: Alt+O
Copies text from the clipboard and inserts it in the cursor position.
Default key: Shift+Insert
Re-applies changes, formerly rolled back by
- set_line LINE_ID, TEXT, [ OPERATION, FROM, LENGTH ]
Changes line at LINE_ID to new TEXT. Hint scalars OPERATION, FROM and LENGTH used to maintain selection and marking data. OPERATION is an arbitrary string, the ones that are recognized are
'delete'. FROM and LENGTH define the range of the change; FROM is a character offset and LENGTH is a length of changed text.
Splits a line in two at the cursor position.
Default key: Enter ( or Ctrl+Enter if wantReturns is 0 )
Selects all text
- start_block [ BLOCK_TYPE ]
Begins the block selection session. The block type if BLOCK_TYPE, if it is specified, or blockType property value otherwise.
Rolls back changes into internal array, which size cannot extend
undoLimitvalue. In case
undoLimitis 0, no undo actions can be made.
Adjusts the selection inside the block session, extending of shrinking it to the current cursor position.
- word_left [ REPEAT = 1 ]
Moves cursor REPEAT words to the left.
- word_right [ REPEAT = 1 ]
Moves cursor REPEAT words to the right.
Dmitry Karasik, <email@example.com>.