nedit.html

nedit 是一款linux下的开发源码的功能强大的编辑器

</P><P>
Under X and Motif, there are several levels of translation between keyboard
keys and the actions they perform in a program.  The "<A HREF="#Customizing_NEdit">Customizing NEdit</A>", and
"<A HREF="#X_Resources">X Resources</A>" sections of the Help menu have more information on this subject. 
Because of all of this configurability, and since keyboards and standards for
the meaning of some keys vary from machine to machine, the mappings may be
changed from the defaults listed below.
</P><P>
<H3>Modifier Keys (in general)</H3>
</P><P>
<PRE>
    Ctrl   Extends the scope of the action that the key
           would otherwise perform.  For example, Home
           normally moves the insert cursor to the beginning
           of a line. Ctrl+Home moves it to the beginning of
           the file.  Backspace deletes one character, Ctrl+
           Backspace deletes one word.
</PRE>
</P><P>
<PRE>
    Shift  Extends the selection to the cursor position. If
           there's no selection, begins one between the old
           and new cursor positions.
</PRE>
</P><P>
<PRE>
    Alt    When modifying a selection, makes the selection
           rectangular.
</PRE>
</P><P>
(For the effects of modifier keys on mouse button presses, see the section
titled "<A HREF="#Using_the_Mouse">Using the Mouse</A>")
</P><P>
<H3>All Keyboards</H3>
</P><P>
<PRE>
    Escape        Cancels operation in progress: menu
                  selection, drag, selection, etc.  Also
                  equivalent to cancel button in dialogs.
</PRE>
</P><P>
<PRE>
    Backspace     Delete the character before the cursor
</PRE>
</P><P>
<PRE>
    Ctrl+BS       Delete the word before the cursor
</PRE>
</P><P>
<PRE>
    Arrows --
</PRE>
</P><P>
<PRE>
      Left        Move the cursor to the left one character
</PRE>
</P><P>
<PRE>
      Ctrl+Left   Move the cursor backward one word
                  (Word delimiters are settable, see
                  "<A HREF="#Customizing_NEdit">Customizing NEdit</A>", and "<A HREF="#X_Resources">X Resources</A>")
</PRE>
</P><P>
<PRE>
      Right       Move the cursor to the right one character
</PRE>
</P><P>
<PRE>
      Ctrl+Right  Move the cursor forward one word
</PRE>
</P><P>
<PRE>
      Up          Move the cursor up one line
</PRE>
</P><P>
<PRE>
      Ctrl+Up     Move the cursor up one paragraph.
                  (Paragraphs are delimited by blank lines)
</PRE>
</P><P>
<PRE>
      Down        Move the cursor down one line.
</PRE>
</P><P>
<PRE>
      Ctrl+Down   Move the cursor down one paragraph.
</PRE>
</P><P>
<PRE>
    Ctrl+Return   Return with automatic indent, regardless
                  of the setting of Auto Indent.
</PRE>
</P><P>
<PRE>
    Shift+Return  Return without automatic indent,
                  regardless of the setting of Auto Indent.
</PRE>
</P><P>
<PRE>
    Ctrl+Tab      Insert an ASCII tab character, without
                  processing emulated tabs.
</PRE>
</P><P>
<PRE>
    Alt+Ctrl+&#60;c&#62;  Insert the control-code equivalent of
                  a key &#60;c&#62;
</PRE>
</P><P>
<PRE>
    Ctrl+/        Select everything (same as Select
                  All menu item or ^A)
</PRE>
</P><P>
<PRE>
    Ctrl+\        Unselect
</PRE>
</P><P>
<PRE>
    Ctrl+U        Delete to start of line
</PRE>
</P><P>
<H3>PC Standard Keyboard</H3>
</P><P>
<PRE>
    Ctrl+Insert   Copy the primary selection to the
                  clipboard (same as Copy menu item or ^C)
                  for compatibility with Motif standard key
                  binding
    Shift+Ctrl+
    Insert        Copy the primary selection to the cursor
                  location.
</PRE>
</P><P>
<PRE>
    Delete        Delete the character before the cursor.
                  (Can be configured to delete the character
                  after the cursor, see "<A HREF="#Customizing_NEdit">Customizing NEdit</A>",
                  and "<A HREF="#X_Resources">X Resources</A>")
</PRE>
</P><P>
<PRE>
    Ctrl+Delete   Delete to end of line.
</PRE>
</P><P>
<PRE>
    Shift+Delete  Cut, remove the currently selected text
                  and place it in the clipboard. (same as
                  Cut menu item or ^X) for compatibility
                  with Motif standard key binding
    Shift+Ctrl+
    Delete        Cut the primary selection to the cursor
                  location.
</PRE>
</P><P>
<PRE>
    Home          Move the cursor to the beginning of the
                  line
</PRE>
</P><P>
<PRE>
    Ctrl+Home     Move the cursor to the beginning of the
                  file
</PRE>
</P><P>
<PRE>
    End           Move the cursor to the end of the line
</PRE>
</P><P>
<PRE>
    Ctrl+End      Move the cursor to the end of the file
</PRE>
</P><P>
<PRE>
    PageUp        Scroll and move the cursor up by one page.
</PRE>
</P><P>
<PRE>
    Ctrl+PageUp   Scroll and move the cursor left by one
                  page.
    PageDown      Scroll and move the cursor down by one
                  page.
</PRE>
</P><P>
<PRE>
    Ctrl+PageDown Scroll and move the cursor right by one
                  page.
</PRE>
</P><P>
<PRE>
    F10           Make the menu bar active for keyboard
                  input (Arrow Keys, Return, Escape,
                  and the Space Bar)
</PRE>
</P><P>
<H3>Specialty Keyboards  </H3>
</P><P>
On machines with different styles of keyboards, generally, text editing
actions are properly matched to the labeled keys, such as Remove,
Next-screen, etc..  If you prefer different key bindings, see the section
titled "<A HREF="#Key_Binding">Key Binding</A>" under the Customizing heading in the Help menu.
<P><HR>
</P><P>
<A NAME="Shifting_and_Filling"></A>
<H2> Shifting and Filling </H2>
</P><P>
<H3>Shift Left, Shift Right</H3>
</P><P>
While shifting blocks of text is most important for programmers (See Features
for Programming), it is also useful for other tasks, such as creating
indented paragraphs.
</P><P>
To shift a block of text one tab stop to the right, select the text, then
choose Shift Right from the Edit menu.  Note that the accelerator keys for
these menu items are Ctrl+9 and Ctrl+0, which correspond to the right and
left parenthesis on most keyboards.  Remember them as adjusting the text in
the direction pointed to by the parenthesis character.  Holding the Shift key
while selecting either Shift Left or Shift Right will shift the text by one
character.
</P><P>
It is also possible to shift blocks of text by selecting the text
rectangularly, and dragging it left or right (and up or down as well).  Using
a rectangular selection also causes tabs within the selection to be
recalculated and substituted, such that the non-whitespace characters remain
stationary with respect to the selection.
</P><P>
<H3>Filling  </H3>
</P><P>
Text filling using the Fill Paragraph command in the Edit menu is one of the
most important concepts in NEdit.  And it will be well worth your while to
understand how to use it properly.
</P><P>
In plain text files, unlike word-processor files, there is no way to tell
which lines are continuations of other lines, and which lines are meant to be
separate, because there is no distinction in meaning between newline
characters which separate lines in a paragraph, and ones which separate
paragraphs from other text.  This makes it impossible for a text editor like
NEdit to tell parts of the text which belong together as a paragraph from
carefully arranged individual lines.
</P><P>
In continuous wrap mode (Preferences -&#62; Wrap -&#62; Continuous), lines
automatically wrap and unwrap themselves to line up properly at the right
margin.  In this mode, you simply omit the newlines within paragraphs and let
NEdit make the line breaks as needed.  Unfortunately, continuous wrap mode is
not appropriate in the majority of situations, because files with extremely
long lines are not common under Unix and may not be compatible with all
tools, and because you can't achieve effects like indented sections, columns,
or program comments, and still take advantage of the automatic wrapping.
</P><P>
Without continuous wrapping, paragraph filling is not entirely automatic. 
Auto-Newline wrapping keeps paragraphs lined up as you type, but once
entered, NEdit can no longer distinguish newlines which join wrapped text,
and newlines which must be preserved.  Therefore, editing in the middle of a
paragraph will often leave the right margin messy and uneven.
</P><P>
Since NEdit can't act automatically to keep your text lined up, you need to
tell it explicitly where to operate, and that is what Fill Paragraph is for. 
It arranges lines to fill the space between two margins, wrapping the lines
neatly at word boundaries.  Normally, the left margin for filling is inferred
from the text being filled.  The first line of each paragraph is considered
special, and its left indentation is maintained separately from the remaining
lines (for leading indents, bullet points, numbered paragraphs, etc.). 
Otherwise, the left margin is determined by the furthest left non-whitespace
character.  The right margin is either the Wrap Margin, set in the
preferences menu (by default, the right edge of the window), or can also be
chosen on the fly by using a rectangular selection (see below).
</P><P>
There are three ways to use Fill Paragraph.  The simplest is, while you are
typing text, and there is no selection, simply select Fill Paragraph (or type
Ctrl+J), and NEdit will arrange the text in the paragraph adjacent to the
cursor.  A paragraph, in this case, means an area of text delimited by blank
lines.
</P><P>
The second way to use Fill Paragraph is with a selection.  If you select a
range of text and then chose Fill Paragraph, all of the text in the selection
will be filled.  Again, continuous text between blank lines is interpreted as
paragraphs and filled individually, respecting leading indents and blank
lines.
</P><P>
The third, and most versatile, way to use Fill Paragraph is with a
rectangular selection.  Fill Paragraph treats rectangular selections
differently from other commands.  Instead of simply filling the text inside
the rectangular selection, NEdit interprets the right edge of the selection
as the requested wrap margin.  Text to the left of the selection is not