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From: colin@nbc1.ge.com (Colin Rafferty)
Newsgroups: comp.windows.x.motif
Subject: Re: Centering Widgets
Message-ID: <COLIN.90Nov28132402@nbc1.ge.com>
Date: 28 Nov 90 18:24:02 GMT
References: <1990Nov18.103134@lbl.gov>
Sender: colin@nbc1.ge.com (Colin Rafferty)
Organization: National Broadcasting Company, Inc., New York
Lines: 78
In-Reply-To: ctday@lbl.gov's message of 18 Nov 90 18:31:34 GMT

In article <1990Nov18.103134@lbl.gov> ctday@lbl.gov (Christopher T. Day) writes:

> Is it possible to center a widget in a resizable area using one of
> the standard Motif widgets?
> ....I don't
> want the buttons themselves to change size, just the space between
> them. 

I tried to figure this one out, and it is possible using the form
widget.  The real trick is to have what I call a "Spot" which is
placed where you want the center of the button, and then the button is
placed around it.

Here is a simple uil module to do it.  No C, since I haven't seen a
reason to write an interface in C yet.

---------------- begin uil ----------------

module center
    version = 'V1.0'
    names = case_sensitive

value buttonWidth : 150;
value buttonHeight : 50;

object Form : XmForm widget {
    arguments {
	XmNwidth = buttonWidth;
	XmNheight = buttonHeight;
    };
    controls {
	XmSeparator Spot;
	XmPushButton Button;
    };
};

object Button : XmPushButton widget {
    arguments {
	XmNfontList = Bigfont;
	XmNlabelString = 'Centered';
	XmNleftAttachment = XmATTACH_WIDGET;
	XmNleftWidget = XmSeparator Spot;
	XmNleftOffset = - (buttonWidth / 2);
	XmNrightAttachment = XmATTACH_WIDGET;
	XmNrightWidget = XmSeparator Spot;
	XmNrightOffset = - (buttonWidth / 2);
	XmNtopAttachment = XmATTACH_WIDGET;
	XmNtopWidget = XmSeparator Spot;
	XmNtopOffset = - (buttonHeight / 2);
	XmNbottomAttachment = XmATTACH_WIDGET;
	XmNbottomWidget = XmSeparator Spot;
	XmNbottomOffset = - (buttonHeight / 2);
    };
};

object Spot : XmSeparator widget {
    arguments {
	XmNseparatorType = XmNO_LINE;
	XmNleftAttachment = XmATTACH_POSITION;
	XmNleftPosition = 50;
	XmNrightAttachment = XmATTACH_POSITION;
	XmNrightPosition = 50;
	XmNtopAttachment = XmATTACH_POSITION;
	XmNtopPosition = 50;
	XmNbottomAttachment = XmATTACH_POSITION;
	XmNbottomPosition = 50;
    };
};

end module;

---------------- end uil ----------------

  //=====================================\/==============================\\
  ||       Colin Owen Rafferty           ||  "Life is so complex, parts  ||
  ||        colin@nbc1.ge.com            ||   of it must be imaginary."  ||
  || {philabs,crdgw1,ge-dab}!nbc1!colin  ||               -Tim Thiel     ||
  \\=====================================/\==============================//