#pragma src     "/sys/src/libpanel"
#pragma lib     "libpanel.a"
typedef struct Scroll Scroll;
typedef struct Panel Panel;             /* a Graphical User Interface element */
typedef struct Rtext Rtext;             /* formattable text */
typedef void Icon;                      /* Always used as Icon * -- Bitmap or char */
typedef struct Idol Idol;               /* A picture/text combo */
struct Scroll{
       Point pos, size;
};
struct Rtext{
       int hot;                /* responds to hits? */
       void *user;             /* user data */
       int space;              /* how much space before, if no break */
       int indent;             /* how much space before, after a break */
       Bitmap *b;              /* what to display, if nonzero */
       Panel *p;               /* what to display, if nonzero and b==0 */
       Font *font;             /* font in which to draw text */
       char *text;             /* what to display, if b==0 and p==0 */
       Rtext *next;            /* next piece */
       /* private below */
       Rtext *nextline;        /* links line to line */
       Rtext *last;            /* last, for append */
       Rectangle r;            /* where to draw, if origin were Pt(0,0) */
       int topy;               /* y coord of top of line */
       int wid;                /* not including space */
};
struct Panel{
       Point ipad, pad;                                /* extra space inside and outside */
       Point fixedsize;                                /* size of Panel, if FIXED */
       int user;                                       /* available for user */
       void *userp;                                    /* available for user */
       Rectangle r;                                    /* where the Panel goes */
       /* private below */
       Panel *next;                                    /* It's a list! */
       Panel *child, *echild, *parent;                 /* No, it's a tree! */
       Bitmap *b;                                      /* where we're drawn */
       int flags;                                      /* position flags, see below */
       char *kind;                                     /* what kind of panel? */
       int state;                                      /* for hitting & drawing purposes */
       Point size;                                     /* space for this Panel */
       Point sizereq;                                  /* size requested by this Panel */
       Point childreq;                                 /* total size needed by children */
       Panel *lastmouse;                               /* who got the last mouse event? */
       Panel *scrollee;                                /* pointer to scrolled window */
       Panel *xscroller, *yscroller;                   /* pointers to scroll bars */
       Scroll scr;                                     /* scroll data */
       void *data;                                     /* kind-specific data */
       void (*draw)(Panel *);                          /* draw panel and children */
       int (*hit)(Panel *, Mouse *);                   /* process mouse event */
       void (*type)(Panel *, Rune);                    /* process keyboard event */
       Point (*getsize)(Panel *, Point);               /* return size, given child size */
       void (*childspace)(Panel *, Point *, Point *);  /* child ul & size given our size */
       void (*scroll)(Panel *, int, int, int, int);    /* scroll bar to scrollee */
       void (*setscrollbar)(Panel *, int, int, int);   /* scrollee to scroll bar */
       void (*free)(Panel *);                          /* free fields of data when done */
};
/*
* Panel flags -- there are more private flags in panelprivate.h
* that need to be kept synchronized with these!
*/
#define PACK    0x0007          /* which side of the parent is the Panel attached to? */
#define         PACKN   0x0000
#define         PACKE   0x0001
#define         PACKS   0x0002
#define         PACKW   0x0003
#define         PACKCEN 0x0004  /* only used by pulldown */
#define FILLX   0x0008          /* grow horizontally to fill the available space */
#define FILLY   0x0010          /* grow vertically to fill the available space */
#define PLACE   0x01e0          /* which side of its space should the Panel adhere to? */
#define         PLACECEN 0x0000
#define         PLACES  0x0020
#define         PLACEE  0x0040
#define         PLACEW  0x0060
#define         PLACEN  0x0080
#define         PLACENE 0x00a0
#define         PLACENW 0x00c0
#define         PLACESE 0x00e0
#define         PLACESW 0x0100
#define EXPAND  0x0200          /* use up all extra space in the parent */
#define FIXED   0x0c00          /* don't pass children's size requests through to parent */
#define FIXEDX  0x0400
#define FIXEDY  0x0800
#define MAXX    0x1000          /* make x size as big as biggest sibling's */
#define MAXY    0x2000          /* make y size as big as biggest sibling's */
#define BITMAP  0x4000          /* text argument is a bitmap, not a string */
/*
* An extra bit in Mouse.buttons
*/
#define OUT     8                       /* Mouse.buttons bit, set when mouse leaves Panel */
int plinit(int);                        /* initialization */
int plpack(Panel *, Rectangle);         /* figure out where to put the Panel & children */
void plmove(Panel *, Point);            /* move an already-packed panel to a new location */
void pldraw(Panel *, Bitmap *);         /* display the panel on the bitmap */
void plfree(Panel *);                   /* give back space */
void plgrabkb(Panel *);                 /* this Panel should receive keyboard events */
void plkeyboard(Rune);                  /* send a keyboard event to the appropriate Panel */
void plmouse(Panel *, Mouse);           /* send a Mouse event to a Panel tree */
void plscroll(Panel *, Panel *, Panel *); /* link up scroll bars */
char *plentryval(Panel *);              /* entry delivers its value */
void plsetbutton(Panel *, int);         /* set or clear the mark on a button */
void plsetslider(Panel *, int, int);    /* set the value of a slider */
Rune *pleget(Panel *);                  /* get the text from an edit window */
int plelen(Panel *);                    /* get the length of the text from an edit window */
void plegetsel(Panel *, int *, int *);  /* get the selection from an edit window */
void plepaste(Panel *, Rune *, int);    /* paste in an edit window */
void plesel(Panel *, int, int);         /* set the selection in an edit window */
void plescroll(Panel *, int);           /* scroll an edit window */
Scroll plgetscroll(Panel *);            /* get scrolling information from panel */
void plsetscroll(Panel *, Scroll);      /* set scrolling information */
void plplacelabel(Panel *, int);        /* label placement */
/*
* Panel creation & reinitialization functions
*/
Panel *plbutton(Panel *pl, int, Icon *, void (*)(Panel *pl, int));
Panel *plcanvas(Panel *pl, int, void (*)(Panel *), void (*)(Panel *pl, Mouse *));
Panel *plcheckbutton(Panel *pl, int, Icon *, void (*)(Panel *pl, int, int));
Panel *pledit(Panel *, int, Point, Rune *, int, void (*)(Panel *));
Panel *plentry(Panel *pl, int, int, char *, void (*)(Panel *pl, char *));
Panel *plframe(Panel *pl, int);
Panel *plgroup(Panel *pl, int);
Panel *plidollist(Panel*, int, Point, Font*, Idol*, void (*)(Panel*, int, void*));
Panel *pllabel(Panel *pl, int, Icon *);
Panel *pllist(Panel *pl, int, char *(*)(Panel *, int), int, void(*)(Panel *pl, int, int));
Panel *plmenu(Panel *pl, int, Icon **, int, void (*)(int, int));
Panel *plmenubar(Panel *pl, int, int, Icon *, Panel *pl, Icon *, ...);
Panel *plmessage(Panel *pl, int, int, char *);
Panel *plpopup(Panel *pl, int, Panel *pl, Panel *pl, Panel *pl);
Panel *plpulldown(Panel *pl, int, Icon *, Panel *pl, int);
Panel *plradiobutton(Panel *pl, int, Icon *, void (*)(Panel *pl, int, int));
Panel *plscrollbar(Panel *plparent, int flags);
Panel *plslider(Panel *pl, int, Point, void(*)(Panel *pl, int, int, int));
Panel *pltextview(Panel *, int, Point, Rtext *, void (*)(Panel *, int, Rtext *));
void plinitbutton(Panel *, int, Icon *, void (*)(Panel *, int));
void plinitcanvas(Panel *, int, void (*)(Panel *), void (*)(Panel *, Mouse *));
void plinitcheckbutton(Panel *, int, Icon *, void (*)(Panel *, int, int));
void plinitedit(Panel *, int, Point, Rune *, int, void (*)(Panel *));
void plinitentry(Panel *, int, int, char *, void (*)(Panel *, char *));
void plinitframe(Panel *, int);
void plinitgroup(Panel *, int);
void plinitidollist(Panel*, int, Point, Font*, Idol*, void (*)(Panel*, int, void*));
void plinitlabel(Panel *, int, Icon *);
void plinitlist(Panel *, int, char *(*)(Panel *, int), int, void(*)(Panel *, int, int));
void plinitmenu(Panel *, int, Icon **, int, void (*)(int, int));
void plinitmessage(Panel *, int, int, char *);
void plinitpopup(Panel *, int, Panel *, Panel *, Panel *);
void plinitpulldown(Panel *, int, Icon *, Panel *, int);
void plinitradiobutton(Panel *, int, Icon *, void (*)(Panel *, int, int));
void plinitscrollbar(Panel *parent, int flags);
void plinitslider(Panel *, int, Point, void(*)(Panel *, int, int, int));
void plinittextview(Panel *, int, Point, Rtext *, void (*)(Panel *, int, Rtext *));
/*
* Rtext constructors & destructor
*/
Rtext *plrtstr(Rtext **, int, int, Font *, char *, int, void *);
Rtext *plrtbitmap(Rtext **, int, int, Bitmap *, int, void *);
Rtext *plrtpanel(Rtext **, int, int, Panel *, void *);
void plrtfree(Rtext *);
Rtext *plgetpostextview(Panel *);
void plsetpostextview(Panel *, Rtext *);
/*
* Idols
*/
Idol *plmkidol(Idol**, Bitmap*, Bitmap*, char*, void*);
void plfreeidol(Idol*);
Point plidolsize(Idol*, Font*, int);
void *plidollistgetsel(Panel*);

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