jms@tardis.Tymnet.COM (Joe Smith) (01/04/90)
>In article <22900@ut-emx.UUCP> hcobb@walt.cc.utexas.edu (Henry J. Cobb) writes: > Mr Sinz is right, the documented procedure would not work. Why not use >the field as a bit-map, whenever a gadget becomes selected any other gadgets >with which it has a matching bit set, is deselected. > Example: >Gadget A has bits 2 & 3 set >Gadget B has bits 4 & 6 set >Gadget C has bits 3 & 6 set > A and B will not deactivate each other but C will exclude both. If a >gadget has no bits set it neither excludes nor is excluded by any other gadget. [Picture light bulb going off over my head] Now I understand. Let my recap: The original (nonfunctioning) description has each gadget numbered, and the MutualExclude field has one bit set for each of the up to 32 gadgets that this one excludes. When current gadget is selected, read its bits, then locate the excluded gadgets by travelling down the linked list, counting each gadget passed over and comparing that number with the bit number. The main problem is that the numbers assigned to the gadgets is not clearly spelled out. Adding more system gadgets will change the numbering of the user's gadgets. Henry's idea: Up to 32 mutual exclude groups can be defined. Each gadget can belong to any number of groups. Gadget C above belongs to group #3 and group #6, and when selected, cancels all other gadgets in group 3 and group 6. Each gadget unambiguously identifies which group it belongs to by setting the appropriate bit int the MutualExclude field. The system gadgets belong to no group, do not cancel any user gadgets, and cannot be cancelled by any user gadgets. A gadget (probably named "Defaults") can have all 32 bits set. When selected, it clears all other mutual exclude gadgets. If any mutual exclude gadget is selected, it turns off the "Defaults" gadget. My alternative idea: Use one half of the field for 16 flag bits, the other half to specify a number from 0 to 64K to specify which group this gadget belongs to. The advantage is that more groups can be used. All sorts of stuff can be done with the 16 flag bits. ---- But what I want is not mutual exclude gadgets in general. I just want radio buttons - a specific subset of the mutual exclusion idea. System defined images of round buttons. Is that what we can expect in 1.4? -- Joe Smith (408)922-6220 | SMTP: JMS@F74.TYMNET.COM or jms@gemini.tymnet.com BT Tymnet Tech Services | UUCP: ...!{ames,pyramid}!oliveb!tymix!tardis!jms PO Box 49019, MS-D21 | PDP-10 support: My car's license plate is "POPJ P," San Jose, CA 95161-9019 | humorous dislaimer: "My Amiga speaks for me."