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FormP.h

/* $XConsortium: FormP.h,v 1.22 94/04/17 20:12:09 kaleb Exp $ */

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Copyright (c) 1987, 1988, 1994  X Consortium

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Copyright 1987, 1988 by Digital Equipment Corporation, Maynard, Massachusetts.

                        All Rights Reserved

Permission to use, copy, modify, and distribute this software and its 
documentation for any purpose and without fee is hereby granted, 
provided that the above copyright notice appear in all copies and that
both that copyright notice and this permission notice appear in 
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******************************************************************/

/* Form widget private definitions */

#ifndef _XawFormP_h
#define _XawFormP_h

#include <X11/Xaw3d/Form.h>

#define XtREdgeType "EdgeType"

typedef enum {LayoutPending, LayoutInProgress, LayoutDone} LayoutState;
#define XtInheritLayout ((Boolean (*)())_XtInherit)

typedef struct {
    Boolean (*layout)(/* FormWidget, Dimension, Dimension */);
} FormClassPart;

/*
 * Layout(
 *    FormWidget w      - the widget whose children are to be configured
 *    Dimension w, h    - bounding box of layout to be calculated
 *
 *  Stores preferred geometry in w->form.preferred_{width,height}.
 *  If w->form.resize_in_layout is True, then a geometry request
 *  may be made for the preferred bounding box if necessary.
 *
 *  Returns True if a geometry request was granted, False otherwise.
 */

typedef struct _FormClassRec {
    CoreClassPart core_class;
    CompositeClassPart  composite_class;
    ConstraintClassPart constraint_class;
    FormClassPart form_class;
} FormClassRec;

extern FormClassRec formClassRec;

typedef struct _FormPart {
    /* resources */
    int           default_spacing;    /* default distance between children */
    /* private state */
    Dimension     old_width, old_height; /* last known dimensions        */
    int           no_refigure;          /* no re-layout while > 0        */
    Boolean needs_relayout;       /* next time no_refigure == 0    */
    Boolean resize_in_layout;   /* should layout() do geom request?  */
    Dimension     preferred_width, preferred_height; /* cached from layout */
    Boolean     resize_is_no_op;    /* Causes resize to take not action. */
} FormPart;

typedef struct _FormRec {
    CorePart            core;
    CompositePart composite;
    ConstraintPart      constraint;
    FormPart            form;
} FormRec;

typedef struct _FormConstraintsPart {
/*
 * Constraint Resources.
 */
    XtEdgeType    top, bottom,      /* where to drag edge on resize           */
            left, right;
    int           dx;         /* desired horiz offset             */
    int           dy;         /* desired vertical offset          */
    Widget  horiz_base; /* measure dx from here if non-null */
    Widget  vert_base;  /* measure dy from here if non-null */
    Boolean allow_resize;     /* TRUE if child may request resize */

/*
 * Private contstraint resources.
 */

/*
 * What the size of this child would be if we did not impose the 
 * constraint the width and height must be greater than zero (0).
 */
    short   virtual_width, virtual_height;

/*
 * Temporary Storage for children's new possible possition.
 */

    Position new_x, new_y;

    LayoutState   layout_state;     /* temporary layout state           */
    Boolean deferred_resize; /* was resized while no_refigure is set */
} FormConstraintsPart;

typedef struct _FormConstraintsRec {
    FormConstraintsPart form;
} FormConstraintsRec, *FormConstraints;

#endif /* _XawFormP_h */

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