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%
% Window-Label.SL
%
% Author: Alan Snyder
% Hewlett-Packard/CRC
% Date: 31 January 1983
% Revised: 16 February 1983
%
% A Window-Label object maintains the "label" portion of a buffer-window.
% This always occupies the lowermost "n" lines of the virtual screen,
% where "n" is 1 by default in this implementation.
%
% 16-Feb-83 Alan Snyder
% Declare -> Declare-Flavor.
% 10-Feb-83 Alan Snyder
% Fix bug: minor modes did not display.
%
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
(BothTimes (load objects))
(CompileTime (load fast-int fast-vectors fast-strings display-char))
(de create-window-label (w)
% Create a window-label object that will maintain the label portion
% of the specified buffer-window.
(make-instance 'window-label 'window w))
(defflavor window-label
(window % the buffer-window object
(height 1) % number of screen rows occupied by the label
minrow % location of top row of the label
maxrow % location of the bottom row of the label
width % width of the screen
maxcol % highest numbered screen column
pos % current position while writing label
screen % output screen while writing label
(label-enhancement (dc-make-enhancement-mask INVERSE-VIDEO))
(prompt-enhancement (dc-make-enhancement-mask INVERSE-VIDEO INTENSIFY))
% The following instance variables store the various information used
% in the construction of the label as currently displayed. This information
% is saved so that it can be compared against the current information
% to determine whether the displayed label needs to be recomputed.
(buffer-name NIL) % name of buffer (as displayed)
(buffer-mode NIL) % buffer's mode (as displayed)
(minor-modes NIL) % minor mode list (as displayed)
(buffer-file NIL) % buffer's filename (as displayed)
(buffer-top NIL) % buffer-top (as used in label)
(buffer-left NIL) % buffer-left (as used in label)
(buffer-size NIL) % current buffer size (as used in label)
(buffer-modified NIL) % buffer-modified flag (as used in label)
(current-window NIL) % current-window (at time label was written)
(prompt-string NIL) % PromptString* (at time label was written)
)
()
(gettable-instance-variables
height
)
(settable-instance-variables
label-enhancement
prompt-enhancement
)
(initable-instance-variables
window
height
)
)
(fluid '(nmode-major-window nmode-output-buffer nmode-minor-modes))
(declare-flavor text-buffer buffer)
(declare-flavor buffer-window window)
(declare-flavor virtual-screen screen)
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% Public methods:
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
(defmethod (window-label refresh) ()
% Update the label are to correspond to the
% current state of the attached buffer window.
% Conditionally rewrite the entire label, if any relevant
% information has changed.
(let ((buffer (=> window buffer)))
(if (not (and (eq buffer-name (=> buffer name))
(eq buffer-mode (=> buffer mode))
(eq minor-modes nmode-minor-modes)
(eq buffer-file (=> buffer file-name))
(= buffer-top (=> window buffer-top))
(= buffer-left (=> window buffer-left))
(= buffer-size (=> buffer visible-size))
(eq buffer-modified (=> buffer modified?))
(eq current-window nmode-major-window)
(eq prompt-string PromptString*)
))
(=> self &rewrite)
)))
(defmethod (window-label resize) ()
% This method must be invoked whenever the window's size may have changed.
(setf screen (=> window screen))
(setf width (=> screen width))
(setf maxrow (- (=> screen height) 1))
(setf minrow (- maxrow (- height 1)))
(setf maxcol (- width 1))
(setf buffer-name NIL) % force complete rewrite
)
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% Private methods:
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
(defmethod (window-label init) (init-plist)
(=> self resize)
)
(defmethod (window-label &rewrite) ()
% Unconditionally rewrite the entire label.
(let ((buffer (=> window buffer)))
(setf screen (=> window screen))
(setf buffer-name (=> buffer name))
(setf buffer-mode (=> buffer mode))
(setf minor-modes nmode-minor-modes)
(setf buffer-file (=> buffer file-name))
(setf buffer-top (=> window buffer-top))
(setf buffer-left (=> window buffer-left))
(setf buffer-size (=> buffer visible-size))
(setf buffer-modified (=> buffer modified?))
(setf current-window nmode-major-window)
(if PromptString* (setf prompt-string PromptString*))
(let ((old-enhancement (=> screen default-enhancement)))
(=> screen set-default-enhancement label-enhancement)
(setf pos 0)
(if (eq window current-window)
(=> self &write-string "NMODE ")
(=> self &write-string " "))
(=> self &write-string (=> buffer-mode name))
(if (and minor-modes (eq window current-window))
(let ((leader-string " ("))
(for (in minor-mode minor-modes)
(do
(=> self &write-string leader-string)
(setf leader-string " ")
(=> self &write-string (=> minor-mode name))
))
(=> self &write-string ")")
))
% Omit the buffer name if it is directly derived from the file name.
(cond ((or (not buffer-file)
(not (string= buffer-name
(filename-to-buffername buffer-file))))
(=> self &write-string " [")
(=> self &write-string buffer-name)
(=> self &write-string "]")
))
(when buffer-file
(=> self &write-string " ")
(=> self &write-string buffer-file)
)
(when (> buffer-left 0)
(=> self &write-string " >")
(=> self &write-string (BldMsg "%d" buffer-left))
)
(cond
((and (= buffer-top 0) (<= buffer-size (=> window height)))
% The entire buffer is showing on the screen.
% Do nothing.
)
((= buffer-top 0)
% The window is showing the top end of the buffer.
(=> self &write-string " --TOP--")
)
((>= buffer-top (- buffer-size (=> window height)))
% The window is showing the bottom end of the buffer.
(=> self &write-string " --BOT--")
)
(t % Otherwise...
(let ((percentage (/ (* buffer-top 100) buffer-size)))
(=> self &write-string " --")
(=> self &write-char (+ #/0 (/ percentage 10)))
(=> self &write-char (+ #/0 (// percentage 10)))
(=> self &write-string "%--")
)))
(if buffer-modified
(=> self &write-string " *"))
(when (and (StringP prompt-string) (eq buffer nmode-output-buffer))
(=> self &write-string " ")
(=> self &advance-pos (- width (string-length prompt-string)))
(=> screen set-default-enhancement prompt-enhancement)
(=> self &write-string prompt-string)
)
(=> screen clear-to-eol maxrow pos)
(=> screen set-default-enhancement old-enhancement)
)))
(defmethod (window-label &write-string) (string)
(for (from i 0 (string-upper-bound string))
(do (=> screen write (string-fetch string i) maxrow pos)
(setf pos (+ pos 1))
)))
(defmethod (window-label &write-char) (ch)
(=> screen write ch maxrow pos)
(setf pos (+ pos 1))
)
(defmethod (window-label &advance-pos) (col)
(while (< pos col) (=> self &write-char #\space))
)
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
(undeclare-flavor buffer screen window)