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Diffstat (limited to 'ipl/gprocs/navitrix.icn')
| -rw-r--r-- | ipl/gprocs/navitrix.icn | 279 |
1 files changed, 279 insertions, 0 deletions
diff --git a/ipl/gprocs/navitrix.icn b/ipl/gprocs/navitrix.icn new file mode 100644 index 0000000..ad8a79a --- /dev/null +++ b/ipl/gprocs/navitrix.icn @@ -0,0 +1,279 @@ +############################################################################ +# +# File: navitrix.icn +# +# Subject: Procedures to perform file navigation +# +# Author: Ralph E. Griswold +# +# Date: July 10, 2002 +# +############################################################################ +# +# This file is in the public domain. +# +############################################################################ +# +# This package provides an interface for file navigation. It is +# intended for use with another application with a visual interface. +# +############################################################################ +# +# The code is based on Unix but may work in other Unix-like environments. +# +# Directories are shown with a trailing slash. Clicking on a directory +# moves there. Clicking on a file name selects it. The text of the +# button used to dismiss the navigator is put in the global variable +# nav_state, while the name of the selected file is put in the global +# variable nav_file. +# +# nav_keyboard() processes keyboard shortcuts. A return character is +# equivalent to clicking on the Okay button. Other characters cause +# the top list entry to be positioned at a name that starts with or is +# close to the character. +# +# The other application needs only to know this: +# +# The navigator is initialized by calling nav_init(). This opens a +# hidden window, assigned to the global variable nav_window, for +# the navigator. It also assigns the navigator root vidget to the +# global variable nav_root. +# +# To use the navigator, the other application needs to change the +# canvas status nav_window to normal so it can accept user events +# and hide it again when it has been "dismissed". The navigator +# puts the selected file in nav_file as mentioned above. +# +# If the application wants to support the navigator's keyboard +# shortcuts, it needs to set the shortcut procedure to nav_keyboard +# when the navigator window is active. +# +# A typical event loop for using the navigator is: +# +# repeat { # event loop +# case Active() of { +# &window : { # application window +# root_cur := root +# shortcuts_cur := shortcuts +# } +# nav_window : { # navigation window +# root_cur := nav_root +# shortcuts_cur := nav_keyboard +# } +# } +# ProcessEvent(root_cur, , shortcuts_cur) +# case nav_state of { +# &null : next +# "Okay" : load_pattern() +# } +# nav_state := &null +# WAttrib(nav_window, "canvas=hidden") +# } +# +# where process_file() is a procedure that does something with the +# file. +# +# Note that the value of nav_state determines what needs to be done. It is +# null when the navigator has not been used since the last event. If +# the navigator is dismissed with "Cancel" instead of "Okay", nothing +# needs to be done except hide the navigator window and set the nav_state +# to null. +# +# Coupled with this is a procedure (or more than one) that makes the +# navigator window visible, as in +# +# procedure open_cb() +# WAttrib(nav_window, "canvas=normal") +# ... +# return +# end +# +# If there is more than one use of the navigator, the callbacks that +# enable it can set process_file to the appropriate companion procedure. +# +############################################################################ +# +# Requires: Version 9 graphics, UNIX +# +############################################################################ +# +# Links: vsetup +# +############################################################################ + +link vsetup + +$include "keysyms.icn" + +global directory +global dir +global file_list +global files + +# Globals used to communicate with the application that uses the navigator + +global nav_file +global nav_root +global nav_state +global nav_vidgets +global nav_window + +procedure nav_init() + local window_save, atts + + window_save := &window # save current subject window + &window := &null # clear for new subject + atts := navig_atts() + put(atts, "canvas=hidden") + (WOpen ! atts) | stop("*** can't open navigation window") + nav_vidgets := navig() # initialize interface + nav_window := &window # name navigation window + &window := window_save # restore previous subject window + + files := nav_vidgets["files"] + nav_root := nav_vidgets["root"] + + nav_file := &null + + nav_refresh() + + return + +end + +procedure nav_files_cb(vidget, value) + static last_file, last_time + + initial { + last_file := "" + last_time := 0 + } + + if /value then { + last_time := 0 + return + } + + if value ?:= tab(upto('/')) then { + chdir(value) + nav_refresh() + return + } + + nav_file := value + + if (value == last_file) then { + last_file := "" + nav_state := "Okay" + return + } + + last_time := 0 + last_file := value + + return + +end + +procedure nav_refresh() + local ls, input + static x, y + + initial { + x := nav_vidgets["placeholder"].ax + y := nav_vidgets["placeholder"].ay + directory := "" + } + + input := open("pwd", "p") + + WAttrib( nav_window, "drawop=reverse") + DrawString(nav_window, x, y, directory) + DrawString(nav_window, x, y, directory := !input) + WAttrib(nav_window, "drawop=copy") + + close(input) + + file_list := [] + + ls := open("ls -a -p .", "p") + + every put(file_list, !ls) + + VSetItems(files, file_list) + + close(ls) + + return + +end + +procedure nav_okay_cb() + + if /nav_file then { + Notice("No file selected.") + fail + } + + nav_state := "Okay" + + return + +end + +procedure nav_keyboard(e) + + case e of { + "\r" : nav_okay_cb() + Key_Home : VSetState(files, 1) + Key_End : VSetState(files, *file_list) + default : if type(e) == "string" then nav_locate(e) + } + + return + +end + +procedure nav_locate(e) + local i + static pos + + initial pos := list(1) + + every i := 1 to *file_list do { + if file_list[i] >>= e then break + } + + pos[1] := i + + VSetState(files, pos) + + return + +end + +procedure nav_cancel_cb() + + nav_state := "Cancel" + + return + +end + +#===<<vib:begin>>=== modify using vib; do not remove this marker line +procedure navig_atts() + return ["size=294,412", "bg=pale gray", "label=Navitrix"] +end + +procedure navig(win, cbk) +return vsetup(win, cbk, + ["navig:Sizer:::0,0,294,412:Navitrix",], + ["cancel:Button:regular::86,378,49,20:Cancel",nav_cancel_cb], + ["files:List:w::13,50,273,314:",nav_files_cb], + ["okay:Button:regular::21,378,49,20:Okay",nav_okay_cb], + ["placeholder:Button:regularno::20,22,65,17: ",], + ["refresh:Button:regular::224,378,56,20:Refresh",nav_refresh], + ["border:Rect:grooved::18,374,55,28:",nav_okay_cb], + ) +end +#===<<vib:end>>=== end of section maintained by vib |