API Reference - Editor

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API support for the editor has two parts:

(1) CAPIDocument is used to access the buffer that contains the text for one or more editors. Multiple editors may share a single buffer, and buffers are also used for search or source analysis operations.

(2) CAPIEditor is used to access a single editor in the user interface, with a single file open in it. Each editor tab in Wing is a separate editor.

Class CAPIDocument

API to access an open editor document. This class should not be instantiated directly. Use the methods on CAPIApplication and CAPIEditor instead.

A single document may be shared by multiple open editors, and/or search and static code analysis tasks.

Signals

A callback can be connected to the following signals using Connect(signal, cb):

destroy: The document is closing. Calls cb(doc:CAPIDocument).

modified: The document's text has been modified. Calls cb(insert:bool, pos:int, length:int, text:str, lines_added:int) where:

insert is True if text was inserted and False if text was deleted.

pos is the position of the change.

length is the length of text affected.

text is the text that was inserted or deleted.

lines_added is the number of lines added.

presave: The document is about to be saved to disk. Calls cb(filename:str, encoding:str) where filename and encoding are None if the document-specified location and encoding will be used. The callback may make changes to the buffer if desired, though this is best avoided if filename is not None.

save-point: The document has entered or left a save point, where it matches the copy that was read from or written to disk. Calls cb(save_point:bool) where save_point is True if a save point was reached and False if leaving the save point.

filename-changed: The filename for this document has changed. Calls cb(old_name:str, new_name:str) where old_name and new_name are full paths.

Use Disconnect(signal_id) to preemptively disconnect a signal handler, where signal_id is the signal ID previously returned from Connect.

General Access

CAPIDocument.GetMimeType()

Get the mime type for this document, as determined by file name, contents, and Files > File Types > Extra File Types preference.

CAPIDocument.GetFilename()

Get the file name this document. For untitled or scratch buffers, the file name is prefixed with unknown:. For remote files, the file name will be a URL. Use IsUrl to distinguish between file names and URLs.

CAPIDocument.GetEditors()

Get all existing editors for this document. This may be an empty list if the document is only open for searching or static analysis.

Buffer Access

CAPIDocument.GetText()

Get the document's contents as a utf-8 encoded string

CAPIDocument.SetText(txt)

Set the document contents, replacing any existing content. The txt must be either a unicode string or utf-8 encoded text.

CAPIDocument.DeleteChars(start, end)

Delete characters in given range, including the character at end. The offsets are relative to the utf-8 encoded buffer.

CAPIDocument.InsertChars(pos, txt)

Insert characters at the given position. The txt must either be a unicode string or utf-8 encoded text. The offset is relative to the utf-8 encoded buffer.

CAPIDocument.GetLength()

Get the total length of document's utf-8 buffer.

CAPIDocument.GetLineCount()

Get the total number of lines in the document.

CAPIDocument.GetCharRange(start, end)

Get the text in the given range as a utf-8 encoded string. The offsets are relative to the utf-8 encoded buffer.

CAPIDocument.GetLineNumberFromPosition(pos)

Get the line number (0=first) at the given position in the utf-8 encoded buffer

CAPIDocument.GetLineStart(lineno)

Get the character position for the start of the given line number (0=first). The offset is relative to the utf-8 encoded buffer.

CAPIDocument.GetLineEnd(lineno)

Get the character position for the end of given line number (0=first). The offset is relative to the utf-8 encoded buffer.

CAPIDocument.GetAsFileObject()

Get the document's contents in a file-like object

Undo/Redo

CAPIDocument.BeginUndoAction()

Mark the start of an undoable action group. All edits between this call and EndUndoAction will be undone in a single undo operation.

It is critical to call EndUndoAction at the end of the action or the user will experience undos that span many more edits than intended. Use try/finally to guarantee this a follows:

doc.BeginUndoAction()
try:
  # edits here
finally:
  doc.EndUndoAction()

CAPIDocument.EndUndoAction()

Mark the end of an undoable action group.

CAPIDocument.CanUndo()

Check whether undo is available.

CAPIDocument.CanRedo()

Check whether redo is available.

CAPIDocument.Undo()

Undo one edit action in the document.

CAPIDocument.Redo()

Redo edits previously undone with Undo.

Saving

CAPIDocument.Save(filename=None)

Save the document to disk. If a file name is given, a copy is saved there without altering the document's primary file.

CAPIDocument.IsSavePoint()

Check whether the buffer matches its file on disk. Returns True if it does.

Class CAPIEditor

API to access an editor. This class should not be instantiated directly. Use the methods on CAPIApplication instead.

Signals

A callback can be connected to the following signals using Connect(signal, cb):

destroy: The editor has been destroyed. Calls cb(editor:CAPIEditor).

selection-changed: The current selection has changed. Calls cb(start:int, end:int) with the new selection, relative to the utf-8 contents of the CAPIDocument.

selection-lines-changed: The starting and/or ending line for the selection has changed. In Python files this is not emitted when the selection moves to a new physical line within the same logical line of code. Calls cb(first_line, last_line) with the new first and last lines (0=first line in file).

scrolled: The editor view has scrolled. Calls cb(top_line) with the new first visible line (0=first line in file).

visible-lines-changed: The range of visible lines has changed. Calls cb(top_line, bottom_line) with the new top and bottom lines (0=first line in file).

readonly-edit-attempt: An edit was attempted and rejected on a readonly file. Calls cb() without arguments.

data-entry-stopped: Data entry mode has stopped. Calls cb(data_entry_id) where data_entry_id is the ID returned from StartDataEntry.

Use Disconnect(signal_id) to preemptively disconnect a signal handler, where signal_id is the signal ID previously returned from Connect.

General Access

CAPIEditor.IsReadOnly()

Check whether the editor is readonly. Returns True or False.

CAPIEditor.SetReadOnly(readonly)

Set whether or not the editor is read-only. readonly should be True or False.

CAPIEditor.GetDocument()

Get the CAPIDocument object being shown in this view.

Selections

CAPIEditor.GetSelection()

Get (start, end) for the selection on the editor. start is always less than end. The offsets are relative to the utf-8 encoded text in the editor's CAPIDocument.

CAPIEditor.GetSelectedDottedName()

Get (dotted_name, lineno) for the current selection on the editor. The dotted_name may be a simple symbol like 'text', an expression like 'modname.classname.attrib', or None if no dotted name is found at the current selection position.

CAPIEditor.GetAnchorAndCaret()

Get the current selection anchor and caret position. The anchor may come after the caret position if the user has selected backwards in the text. The offsets are relative to the utf-8 encoded text in the editor's CAPIDocument.

CAPIEditor.SetSelection(start, end, expand=1)

Set the selection on the editor, optionally expanding any folded parts to show the selection. start is the selection anchor and end is the caret position. The anchor can be before or after the caret. Does not alter scroll position. Offsets are relative to the utf-8 encoded text in the editor's CAPIDocument.

CAPIEditor.GetClickLocation()

Get the offset in the utf-8 encoded text buffer for the last mouse click on the editor.

CAPIEditor.GetSourceScope()

Get the current source scope, based on position of selection or insertion caret.

Returns None if nothing is selected or a list that contains a filename, a line number (0=first), and zero or more source symbol names indicating the nested scope that the user has selected.

For example:

["/x/y/z.py", 120, "Class1", "Method1"]

For untitled or scratch buffers, the file name is prefixed with unknown:. For remote files, the file name will be a URL. Use IsUrl to distinguish between file names and URLs.

Scrolling and Visual State

CAPIEditor.GetFirstVisibleLine()

Get the line number of the first visible line (0=first in file) on screen in this editor.

CAPIEditor.GetNumberOfVisibleLines()

Get the number of visible lines on screen for this editor.

CAPIEditor.ScrollToLine(lineno, select=0, pos='slop', store_history=1, callout=0)

Scroll so that given line (0=first) or selection is visible in the editor.

select can be one of:

0 to make no changes in selection.

1 to select the whole line.

2 to place the caret at the start of the line.

(start, end) to select the given character range, relative to the utf-8 buffer for the editor. In this case, lineno may be set to -1 to compute the line number from the selection.

pos can be one of:

slop to ensure visibility without a specific position.

center to always center the line on the display.

top to always position the line at the top of the display.

Only center and top will work if the editor has not yet been shown.

Set store_history to False to avoid remembering the current editor position in the visit history.

Set callout to True to briefly display a callout to highlight the given text selection.

CAPIEditor.GetVisualState(errs=[], style='all')

Get the current visual state of the editor, including scroll position, selection, and so forth.

The style of the state may be one of:

'all' to capture all of the application visual state

'tools-and-editors' to capture which tools are visible, the overall layout of the windows, and which editors are open (but not details like scroll positions, selection, or current search string)

'tools-only' to capture only which tools are visible and the overall layout of the windows (but not which editors are open).

Returns an opaque dictionary with the state, for later use with SetVisualState.

Any errors encountered are added to errs as strings.

CAPIEditor.SetVisualState(state)

Restore a visual state previously obtained with GetVisualState.

Folding

CAPIEditor.FoldingAvailable()

Check whether folding is available and enabled on this editor.

CAPIEditor.FoldUnfold(fold_check_cb)

Folds or unfolds all the fold points, as determined by the given call back, which returns 1 to expand, 0 to collapse, and -1 to leave a fold point untouched. If the callback is not a callable, all the folds are either expanded or collapsed according to the value of bool(fold_check_cb).

Returns a list of lineno's that were folded and a list of line numbers (0=first) that were expanded.

Indentation

CAPIEditor.GetTabSize()

Get the effective tab size for this editor, as determined by the contents of the file and indentation preferences.

CAPIEditor.GetIndentSize()

Get the indent size for this editor, as determined by the contents of the file and indentation preferences.

CAPIEditor.GetIndentStyle()

Get the predominant indent style used in this file. Returns one of:: 1 -- spaces only 2 -- tabs only 3 -- mixed tabs and spaces

CAPIEditor.SetIndentStyle(style)

Set the indent style to use in this editor. This should only be used on an empty file or to force indent style regardless of existing file content (not a good idea with Python files).

CAPIEditor.GetEol()

Get one end-of-line that matches the content of this editor. Returns one of: "\n", "\r", or "\r\n".

Command Execution

These methods execute editor commands documented in the Active Editor Commands section of the Editor Commands reference."""

CAPIEditor.CommandAvailable(cmd_name, **args)

Check the whether an editor command is available for execution with the given arguments. Arguments may be omitted if they don't affect command availability, which most don't.

The available commands for an editor are documented in the Active Editor Commands section of the Editor Commands reference.

CAPIEditor.ExecuteCommand(cmd_name, **args)

Execute the given command in the editor. Any command arguments are passed on the command line via args. This is used to execute commands in an editor even if it does not have focus.

The available commands for an editor are documented in the Active Editor Commands section of the Editor Commands reference.

Snippets and Data Entry mode

Class CAPIEditor.CAPIFieldMetaData

Stores meta data for fields used with the meta_data argument for StartDataEntry and PasteSnippet, in order to control how fields are filled and visited.

Available keywords arguments for the constructor are:

auto_enter_from specifies the field index (0=first) from which data for this field should be auto-entered, rather than allowing the user to type into the field. This is used for fields that appear several times. Default: -1, which indicates no auto-entering for the field.

force_tab_stop may be set to True to force including the field as a tab stop even if it is auto-entered from another field. This allows the user to change the auto-entered value. Default: False

skip_tab_stop is set to True to skip this field when traversing fields. This is useful for placing a marker that is tracked during editing but not visited as a tab stop. Default: False

For example to auto-enter a value from field 3:

meta = CAPIFieldMetaData(auto_enter_from=3, force_tab_stop=True)

CAPIEditor.PasteSnippet(txt, fields, auto_terminate=False, meta_data={})

Paste a utf-8 text snippet into the editor and place the editor into inline data entry mode. Snippet syntax is documented in Snippet Syntax.

The txt is the text to paste.

fields provides the (start, end) offsets within that text for fields the user can enter or alter.

Set auto_terminate to stop data entry mode when the last field is reached.

To control behavior of the fields, set meta_data to a dictionary from field index (0=first) to CAPIEditor._CAPIFieldMetaData.

CAPIEditor.StartDataEntry(fields, active_range=(0, -1), goto_first=True, auto_terminate=False, meta_data={})

Start inline data entry mode so the user can use the Tab and Shift-Tab keys to move between data fields inline in the editor.

fields is a list of (start, end) positions where the fields are located, in tab traversal order.

active_range indicates the range of text within which the data mode will exist. Data entry terminates if the caret moves outside of this range or if the user presses Esc. The default range of (0, -1) indicates the entire document.

When goto_first is set, the first field in the tab sequence will become the current selection.

Set auto_terminate to stop data entry mode when the last field is reached.

To control behavior of the fields, set meta_data to a dictionary from field index (0=first) to CAPIEditor._CAPIFieldMetaData.

Returns None if data entry failed to start or otherwise a unique ID for the data entry action.

This may be invoked recursively so that another data entry action is used to fill in a field of a previously created data entry action.

CAPIEditor.StopDataEntry()

Exit inline data entry mode. If StartDataEntry was recursively invoked then the innermost data entry action is exited.

CAPIEditor.ActiveDataEntry()

Get the id of the active data entry action, or None if there is none.

Utilities

CAPIEditor.GrabFocus()

Set keyboard focus on this editor.

CAPIEditor.SendKeys(keys)

Send a string of one or more keys to the editor so they are processed as if they were typed by the user. Key processing includes any auto-editing, auto-indentation, etc.