77 lines
3.3 KiB
Plaintext
77 lines
3.3 KiB
Plaintext
Cdk New Widget Guide
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Copyright Mike Glover, 1995, 1996, 1997, 1998, 1999
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-------------------------------------------------------------------------------
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If you want to create a new widget for Cdk, and want it in the standard
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dist of Cdk, you will have to follow some requisites that I have. I state
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these because Cdk has been worked on for quite some time and I finally
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got it to a state where the functions calls are somewhat consistent. Any new
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widgets should adhere to this. The requirements are as follows:
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* The function names should be like:
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newCDKXXX, destroyCDKXXX, setCDKXXX, drawCDKXX,...
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Any widgets with functions not in this format should be 'private'.
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If this is not the case one of three things will happen:
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1) The widget will not get accepted
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2) I will mail you back asking you to follow the standards.
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3) I will do it myself. (HIGHLY unlikely)
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* The first parameter of the newCDKXXX function should be of type
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CDKSCREEN.
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* If applicable, the next two parameters should be xpos and ypos in
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that order.
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* If applicable, the next two parameters should be the height and
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width of the widget.
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* If the widget has a title, the next parameter should be a char *
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for the title.
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* If the widget has a label, the next parameter should be a char *
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for the label.
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* The last two parameters of the newCDKXXX function should be:
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Boolean box, Boolean shadow if the parameters apply.
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* The drawCDKXXX function should only have the pointer to the object and
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a Boolean box as it's parameters. (in that order)
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* The first parameters of any other function relating to the widget
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should be a pointer to the widget type. ie: CDKRADIO *, CDKFSELECT *...
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* A destroyCDKXXX function has to be provided as well as a drawCDKXXX
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function.
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* Try to contain anything specific to the widget in a single file. This
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keeps the overhead of misc. files from floating around.
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* Create a standalone header file which includes cdk.h if needed.
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If you follow the guidelines, then the files you need to change to sew the new
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widget into Cdk, are:
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cdkscreen.c So this widget will get refreshed on a refreshCDKScreen
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function call.
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binding.c To allow key bindings for the widget. If it is possible
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to have key bindings I stress that this be incorporated.
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cdk.h To add in the function def's to the header file. (ie:
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include the newly created header file.)
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Makefile Add in the new widget files.
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If you have done all of this then what I need from you is the following:
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* A diff of all the files from the dist. that you modified. Use
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patch, I prefer it. If you haven't got it, get it and use it. It makes
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life easy.
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* A copy of the new widget file.
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* tar this up and send it to me at
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glover@credit.erin.utoronto.ca or at mike@vexus.ca
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I will mail you back when I get it and I will tell you if everything is
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OK or not.
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I hate to be such a nit pick, but if we follow the above standards, Cdk will
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evolve into a very nice library, with a lot of really nice widgets.
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If you want to get a hold of me mail me at one of the following:
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glover@credit.erin.utoronto.ca
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mike@vexus.ca
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The CDK Web page has several homes. They are:
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http://www.vexus.ca/CDK.html (official)
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http://www.datasoft.on.ca/~cdk (Sponsored by the nice folks at Datasoft)
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ttfn,
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Mike
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