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s: Simple textbox editing widget with Emacs-like keybindings.iÿÿÿÿNc C sð | j | d | t j | | d | j | | d t j | | d | j | | d t j | | d | j | d | t j | | d | j | | t j | j | | t j | j | | t j | j | | t j d S( s^ Draw a rectangle with corners at the provided upper-left
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and lower-right coordinates.
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RS( sd Editing widget using the interior of a window object.
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Supports the following Emacs-like key bindings:
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Ctrl-A Go to left edge of window.
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Ctrl-B Cursor left, wrapping to previous line if appropriate.
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Ctrl-D Delete character under cursor.
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Ctrl-E Go to right edge (stripspaces off) or end of line (stripspaces on).
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Ctrl-F Cursor right, wrapping to next line when appropriate.
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Ctrl-G Terminate, returning the window contents.
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Ctrl-H Delete character backward.
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Ctrl-J Terminate if the window is 1 line, otherwise insert newline.
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Ctrl-K If line is blank, delete it, otherwise clear to end of line.
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Ctrl-L Refresh screen.
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Ctrl-N Cursor down; move down one line.
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Ctrl-O Insert a blank line at cursor location.
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Ctrl-P Cursor up; move up one line.
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Move operations do nothing if the cursor is at an edge where the movement
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is not possible. The following synonyms are supported where possible:
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KEY_LEFT = Ctrl-B, KEY_RIGHT = Ctrl-F, KEY_UP = Ctrl-P, KEY_DOWN = Ctrl-N
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KEY_BACKSPACE = Ctrl-h
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| d | j | d q^qan d S( s! Process a single editing command.i i (# R
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