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.TH "" 3 "" "Version 3.0" "Free Widget Foundation"
.SH NAME
XfwfToggle
.SH DESCRIPTION
The \fIXfwfToggle\fP is a button that switches states with every activation
(which is by default with every mouse click). The states are named `on' and
`off'. The states can be indicated with a $\surd$ before the label Two
callbacks report the changed state to the application: \fIonCallback\fP is called
when the button switches to `on', \fIoffCallback\fP is called when the button
switches back to `off'.

.SS "Public variables"

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XfwfToggle
Name	Class	Type	Default
XtNonCallback	XtCOnCallback	Callback	NULL 
XtNoffCallback	XtCOffCallback	Callback	NULL 
XtNon	XtCOn	Boolean 	False 
XtNonIcon	XtCOnIcon	Icon *	"filledsquare"
XtNoffIcon	XtCOffIcon	Icon *	"emptysquare"

.TE
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.TP
.I "XtNonCallback"
The \fIonCallback\fP is called by the \fItoggle\fP action or by the \fIswitch_on\fP
action, if the previous state was `off'. The \fIcall_data\fP argument will contain
the \fIXEvent\fP pointer that trigerred the action function.

	

.hi

.nf
<Callback> XtCallbackList  onCallback = NULL 
.fi

.eh

.TP
.I "XtNoffCallback"
The \fIoffCallback\fP is called from the \fItoggle\fP or \fIswitch_off\fP action, if the
previous state was `on'. The \fIcall_data\fP argument will be a pointer to the
\fIXEvent\fP that caused the action.

	

.hi

.nf
<Callback> XtCallbackList  offCallback = NULL 
.fi

.eh

.TP
.I "XtNon"
The variable \fIon\fP records the state of the widget: \fITrue\fP means `on' and
\fIFalse\fP means `off'.

	

.hi

.nf
Boolean  on = False 
.fi

.eh

.TP
.I "XtNonIcon"
By default, the button displays a $\surd$ when on and nothing when
off. The two resources \fIonIcon\fP and \fIoffPIcon\fP can replace these
two graphics with arbitrary pixmaps. Suggested size for these pixmaps
is about $16\times18$.

	

.hi

.nf
Icon * onIcon = <String>"filledsquare"
.fi

.eh

.TP
.I "XtNoffIcon"
The \fIoffIcon\fP is displayed when the button is in `off' state. By
default, nothing is displayed in this state.

	

.hi

.nf
Icon * offIcon = <String>"emptysquare"
.fi

.eh

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XfwfButton
Name	Class	Type	Default
XtNactivate	XtCActivate	Callback	NULL 

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XfwfLabel
Name	Class	Type	Default
XtNlabel	XtCLabel	String 	NULL 
XtNtablist	XtCTablist	String 	NULL 
XtNfont	XtCFont	FontStruct	XtDefaultFont 
XtNforeground	XtCForeground	Pixel 	XtDefaultForeground 
XtNalignment	XtCAlignment	Alignment 	0 
XtNtopMargin	XtCTopMargin	Dimension 	2 
XtNbottomMargin	XtCBottomMargin	Dimension 	2 
XtNleftMargin	XtCLeftMargin	Dimension 	2 
XtNrightMargin	XtCRightMargin	Dimension 	2 
XtNshrinkToFit	XtCShrinkToFit	Boolean 	False 
XtNrvStart	XtCRvStart	Int 	0 
XtNrvLength	XtCRvLength	Int 	0 

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XfwfBoard
Name	Class	Type	Default
XtNabs_x	XtCAbs_x	Position 	0 
XtNrel_x	XtCRel_x	Float 	"0.0"
XtNabs_y	XtCAbs_y	Position 	0 
XtNrel_y	XtCRel_y	Float 	"0.0"
XtNabs_width	XtCAbs_width	Position 	0 
XtNrel_width	XtCRel_width	Float 	"1.0"
XtNabs_height	XtCAbs_height	Position 	0 
XtNrel_height	XtCRel_height	Float 	"1.0"
XtNhunit	XtCHunit	Float 	"1.0"
XtNvunit	XtCVunit	Float 	"1.0"
XtNlocation	XtCLocation	String 	NULL 

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XfwfFrame
Name	Class	Type	Default
XtNcursor	XtCCursor	Cursor 	None 
XtNframeType	XtCFrameType	FrameType 	XfwfRaised 
XtNframeWidth	XtCFrameWidth	Dimension 	0 
XtNouterOffset	XtCOuterOffset	Dimension 	0 
XtNinnerOffset	XtCInnerOffset	Dimension 	0 
XtNshadowScheme	XtCShadowScheme	ShadowScheme 	XfwfAuto 
XtNtopShadowColor	XtCTopShadowColor	Pixel 	compute_topcolor 
XtNbottomShadowColor	XtCBottomShadowColor	Pixel 	compute_bottomcolor 
XtNtopShadowStipple	XtCTopShadowStipple	Bitmap 	NULL 
XtNbottomShadowStipple	XtCBottomShadowStipple	Bitmap 	NULL 

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XfwfCommon
Name	Class	Type	Default
XtNtraversalOn	XtCTraversalOn	Boolean 	True 
XtNhighlightThickness	XtCHighlightThickness	Dimension 	2 
XtNhighlightColor	XtCHighlightColor	Pixel 	XtDefaultForeground 
XtNhighlightPixmap	XtCHighlightPixmap	Pixmap 	None 
XtNnextTop	XtCNextTop	Callback	NULL 
XtNuserData	XtCUserData	Pointer	NULL 

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Composite
Name	Class	Type	Default
XtNchildren	XtCChildren	WidgetList 	NULL 
insertPosition	XtCInsertPosition	XTOrderProc 	NULL 
numChildren	XtCNumChildren	Cardinal 	0 

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Core
Name	Class	Type	Default
XtNx	XtCX	Position 	0 
XtNy	XtCY	Position 	0 
XtNwidth	XtCWidth	Dimension 	0 
XtNheight	XtCHeight	Dimension 	0 
borderWidth	XtCBorderWidth	Dimension 	0 
XtNcolormap	XtCColormap	Colormap 	NULL 
XtNdepth	XtCDepth	Int 	0 
destroyCallback	XtCDestroyCallback	XTCallbackList 	NULL 
XtNsensitive	XtCSensitive	Boolean 	True 
XtNtm	XtCTm	XTTMRec 	NULL 
ancestorSensitive	XtCAncestorSensitive	Boolean 	False 
accelerators	XtCAccelerators	XTTranslations 	NULL 
borderColor	XtCBorderColor	Pixel 	0 
borderPixmap	XtCBorderPixmap	Pixmap 	NULL 
background	XtCBackground	Pixel 	0 
backgroundPixmap	XtCBackgroundPixmap	Pixmap 	NULL 
mappedWhenManaged	XtCMappedWhenManaged	Boolean 	True 
XtNscreen	XtCScreen	Screen *	NULL 

.TE
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.SS "Translations"

The \fItoggle\fP action toggles the widget between `on' and `off'. By
default it is bound to a click of the left mouse button as well as to
the Return key.

	

.nf
<Btn1Down>: set_shadow(sunken) 
.fi

.nf
<Btn1Up>: toggle() set_shadow() 
.fi

.nf
<Key>Return: toggle() 
.fi

.hi
.SS "Actions"

.TP
.I "toggle

The \fItoggle\fP action switches the state. Depending on the resources
it might change the tickmark. The \fIonCallback\fP or \fIoffCallback\fP
functions are called, with the event as \fIcall_data\fP argument.

.hi

.nf
void toggle($, XEvent* event, String* params, Cardinal* num_params)
{
    XtVaSetValues($, "on", !$on, NULL);
    XtCallCallbackList($, $on ? $onCallback : $offCallback, event);
}
.fi

.eh

.TP
.I "switch_on

The \fIswitch_on\fP action switches the button to `on' if it is `off',
otherwise it does nothing. By default it isn't bound to any event. If
the widget is changed, the \fIonCallback\fP is called with the event as
\fIcall_data\fP.

.hi

.nf
void switch_on($, XEvent* event, String* params, Cardinal* num_params)
{
    if (! $on) {
        XtVaSetValues($, "on", True, NULL);
        XtCallCallbackList($, $onCallback, event);
    }
}
.fi

.eh

.TP
.I "switch_off

The \fIswitch_off\fP action switches the widget to `off' if the state is
`on', otherwise it does nothing. When the widget changes states, the
\fIoffCallback\fP is called, with a pointer to the \fIXEvent\fP structure as
\fIcall_data\fP argument.

.hi

.nf
void switch_off($, XEvent* event, String* params, Cardinal* num_params)
{
    if ($on) {
        XtVaSetValues($, "on", False, NULL);
        XtCallCallbackList($, $offCallback, event);
    }
}
.fi

.eh

.hi

.hi
.SH "Importss"

The Converters file is needed for the \fIIcon\fP type.

.nf

.B incl
 <Xfwf/Converters.h>
.fi

.hi

.hi
.SS "Private variables"

The \fIon_gc\fP GC holds the picture of the tick mark for the `on'
state.

	

.nf
GC  on_gc
.fi

The \fIoff_gc\fP holds the picture for the `off' state.

	

.nf
GC  off_gc
.fi

The previous value of \fIleftMargin\fP is stored in a private variable.
This value is added to the width of the widest pixmap to give the new
value of \fIleftMargin\fP.

	

.nf
Dimension  saveLeftMargin
.fi

.hi

.hi
.SS "Methods"

The GC's are created for the first time and the left margin is
increased to make room for the on and off icons.

.nf
initialize(Widget  request, $, ArgList  args, Cardinal * num_args)
{
    int status;
    Dimension w1, w2, w;

    $on_gc = NULL;
    $off_gc = NULL;
    create_on_gc($);
    create_off_gc($);

    w1 = $onIcon ? $onIcon->attributes.width : 0;
    w2 = $offIcon ? $offIcon->attributes.width : 0;
    w = max(w1, w2);
    if (w != 0) XtVaSetValues($, XtNleftMargin, $leftMargin + w, NULL);
}
.fi

Question: Does the computation of \fIleftMargin\fP have the desired
effect? Since \fIset_values\fP is downward chained, the Label widget has
already processed it; changing \fIleftMargin\fP doesn't cause Label to
recompute the preferred size\dots

.nf
Boolean  set_values(Widget  old, Widget  request, $, ArgList  args, Cardinal * num_args)
{
    Boolean redraw = False, compute_margin = False;
    Dimension w1, w2, w;

    if ($onIcon != $old$onIcon) {
	create_on_gc($);
	compute_margin = True;
    }
    if ($offIcon != $old$offIcon) {
	create_off_gc($);
	compute_margin = True;
    }
    if ($on != $old$on) {
        redraw = True;
    }
    if (compute_margin) {
	/* Compute w = old margin between icons and text */
	w1 = $old$onIcon ? $old$onIcon->attributes.width : 0;
	w2 = $old$offIcon ? $old$offIcon->attributes.width : 0;
	w = $old$leftMargin - max(w1, w2);
	/* Compute new left margin w = w + width of icons */
	w1 = $onIcon ? $onIcon->attributes.width : 0;
	w2 = $offIcon ? $offIcon->attributes.width : 0;
	w = w + max(w1, w2);
	if ($old$leftMargin != w) {
	    XtVaSetValues($, XtNleftMargin, w, NULL);
	    redraw = False;
	} else
	    redraw = True;
    }
    return redraw;
}
.fi

The \fIexpose\fP method uses the \fIexpose\fP method of the superclass to draw the
button and then possibly adds a tick mark.

.nf
expose($, XEvent * event, Region  region)
{
    Position x, y;
    Dimension w, h;

    if (! XtIsRealized($)) return;
    #expose($, event, region);
    $compute_inside($, x, y, w, h);
    if ($on  $onIcon) {
	y = y + (h - $onIcon->attributes.height)/2;
	XSetTSOrigin(XtDisplay($), $on_gc, x, y);
	XSetClipOrigin(XtDisplay($), $on_gc, x, y);
	XFillRectangle(XtDisplay($), XtWindow($), $on_gc, x, y,
		       $onIcon->attributes.width,
		       $onIcon->attributes.height);
    } else if ($offIcon) {
	y = y + (h - $offIcon->attributes.height)/2;
	XSetTSOrigin(XtDisplay($), $off_gc, x, y);
	XSetClipOrigin(XtDisplay($), $off_gc, x, y);
	XFillRectangle(XtDisplay($), XtWindow($), $off_gc, x, y,
		       $offIcon->attributes.width,
		       $offIcon->attributes.height);
    }
}
.fi

.hi

.hi
.SH "Utilities"

The \fIcreate_on_gc\fP function creates a GC with the \fIonIcon\fP as tile.

.nf
create_on_gc($)
{
    XtGCMask mask = GCFillStyle;
    XGCValues values;

    if ($on_gc != NULL) XtReleaseGC($, $on_gc);
    if ($onIcon  $onIcon->pixmap != None) {
	values.tile = $onIcon->pixmap;
	mask |= GCTile;
    }
    if ($onIcon  $onIcon->mask != None) {
	values.clip_mask = $onIcon->mask;
	mask |= GCClipMask;
    }
    values.fill_style = FillTiled;
    $on_gc = XtGetGC($, mask, values);
}
.fi

The \fIcreate_off_gc\fP function creates a GC with the \fIoffIcon\fP as tile.

.nf
create_off_gc($)
{
    XtGCMask mask = GCFillStyle;
    XGCValues values;

    if ($off_gc != NULL) XtReleaseGC($, $off_gc);
    if ($offIcon  $offIcon->pixmap != None) {
	values.tile = $offIcon->pixmap;
	mask |= GCTile;
    }
    if ($offIcon  $offIcon->mask != None) {
	values.clip_mask = $offIcon->mask;
	mask |= GCClipMask;
    }
    values.fill_style = FillTiled;
    $off_gc = XtGetGC($, mask, values);
}
.fi

.hi