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Fx - The Fx toolkit for building custom Qddb interfaces.




The Fx toolkit allows programmers to easily build custom Qddb applications. You are provided with a set of default menubar options (via Fx_Menubar), and you can organize your attributes any way you like with a combination of Fx_Frame and Fx_Entry. You can add menu buttons, menu items, specify default values, change the entry type between Text, Entry and Radiobutton, and specify mandatory and read-only fields.

For example, suppose you have the following Schema.

# Sample MyRelation/Schema file
a ( b c d )*

An Fx toolkit program for this Schema might look like:

#!/usr/local/qddb/bin/qwish -f
lappend auto_path $qddb_library/fx $blt_library set s [qddb_schema open MyRelation] # You *must* call Fx:Init $s to initialize Fx Fx:Init $s
Fx_Menubar menubar -w .mb -schema $s -array gv_attr set search_entry [menubar SearchForEntry] # define all the instances and how they are viewed. # -setschema should be set on the first # call to Fx_Entry and Fx_Frame
Fx_Frame a -w .a -setschema $s -attr a -side top \ -anchor nw -relief raised
Fx_Entry a.b -w .a.b -searchfor_entry $search_entry -attr a.b \ -relief sunken -bd 3 -side left -setschema $s # configure the Fx_Frame's focus (for adding new entries) a configure -focus [a.b GetEntry]

Fx_Entry a.c -w .a.c -attr a.c -relief sunken -bd 3 -side left pack .a.b -side left -expand on -fill x pack .a.c -side left -expand on -fill x # Note that a.d doesn't have to be in the same physical frame as # its siblings in the Schema.
Fx_Entry d -w .d -attr a.d -relief sunken -bd 3 -side left pack .d -side bottom -expand on -fill x # Link up the frames and entries with the menubar menubar configure -instances [Fx_Entry::GetInstances] \ -frames [Fx_Frame::GetInstances]

# Go to Search Mode to start
menubar SearchModeProc
Fx:InitConfigure ;# sets up window position management


Fx_Menubar(n), Fx_Frame(n), Fx_Entry(n)


A Guide to QDDB
Eric H. Herrin II and Raphael A. Finkel

Qddb User's Guide

An ASCII Database for Fast Queries of Relatively Stable Data Eric H. Herrin II and Raphael A. Finkel Computing Systems, Volume 4 Number 2
University of California Press, Berkeley CA

Schema and Tuple Trees: An Intuitive Structure for Representing Relational Data
Eric H. Herrin, II and Raphael A. Finkel Computing Systems, Volume 9, Number 2
MIT Press, Cambridge MA

TCL and the TK Toolkit
John K. Ousterhout
Addison-Wesley, 1994
ISBN 0-201-63337-X



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