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/*
* Rich text with images.
* Should there be an offset field, to do subscripts & kerning?
*/
#include <u.h>
#include <libc.h>
#include <draw.h>
#include <event.h>
#include <panel.h>
#include "pldefs.h"
#include "rtext.h"
#define LEAD 4 /* extra space between lines */
Rtext *pl_rtnew(Rtext **t, int space, int indent, Image *b, Panel *p, Font *f, char *s, int hot, void *user){
Rtext *new;
new=malloc(sizeof(Rtext));
if(new==0) return 0;
new->hot=hot;
new->user=user;
new->space=space;
new->indent=indent;
new->b=b;
new->p=p;
new->font=f;
new->text=s;
new->next=0;
new->r=Rect(0,0,0,0);
if(*t)
(*t)->last->next=new;
else
*t=new;
(*t)->last=new;
return new;
}
Rtext *plrtpanel(Rtext **t, int space, int indent, Panel *p, void *user){
return pl_rtnew(t, space, indent, 0, p, 0, 0, 1, user);
}
Rtext *plrtstr(Rtext **t, int space, int indent, Font *f, char *s, int hot, void *user){
return pl_rtnew(t, space, indent, 0, 0, f, s, hot, user);
}
Rtext *plrtbitmap(Rtext **t, int space, int indent, Image *b, int hot, void *user){
return pl_rtnew(t, space, indent, b, 0, 0, 0, hot, user);
}
void plrtfree(Rtext *t){
Rtext *next;
while(t){
next=t->next;
free(t);
t=next;
}
}
int pl_tabmin, pl_tabsize;
void pltabsize(int min, int size){
pl_tabmin=min;
pl_tabsize=size;
}
int pl_space(int space, int pos, int indent){
if(space>=0) return space;
switch(PL_OP(space)){
default:
return 0;
case PL_TAB:
return ((pos-indent+pl_tabmin)/pl_tabsize+PL_ARG(space))*pl_tabsize+indent-pos;
}
}
/*
* initialize rectangles & nextlines of text starting at t,
* galley width is wid. Returns the total length of the text
*/
int pl_rtfmt(Rtext *t, int wid){
Rtext *tp, *eline;
int ascent, descent, x, space, a, d, w, topy, indent;
Point p;
p=Pt(0,0);
eline=t;
while(t){
ascent=0;
descent=0;
indent=space=pl_space(t->indent, 0, 0);
x=0;
tp=t;
for(;;){
if(tp->b){
a=tp->b->r.max.y-tp->b->r.min.y+2;
d=0;
w=tp->b->r.max.x-tp->b->r.min.x+4;
}
else if(tp->p){
/* what if plpack fails? */
plpack(tp->p, Rect(0,0,wid,wid));
plmove(tp->p, subpt(Pt(0,0), tp->p->r.min));
a=tp->p->r.max.y-tp->p->r.min.y;
d=0;
w=tp->p->r.max.x-tp->p->r.min.x;
}
else{
a=tp->font->ascent;
d=tp->font->height-a;
w=tp->wid=stringwidth(tp->font, tp->text);
}
if(x+w+space>wid) break;
if(a>ascent) ascent=a;
if(d>descent) descent=d;
x+=w+space;
tp=tp->next;
if(tp==0){
eline=0;
break;
}
space=pl_space(tp->space, x, indent);
if(space) eline=tp;
}
if(eline==t){ /* No progress! Force fit the first block! */
if(a>ascent) ascent=a;
if(d>descent) descent=d;
if(tp==t)
eline=tp->next;
else
eline=tp;
}
topy=p.y;
p.y+=ascent;
p.x=indent=pl_space(t->indent, 0, 0);
for(;;){
t->topy=topy;
t->r.min.x=p.x;
if(t->b){
t->r.max.y=p.y;
t->r.min.y=p.y-(t->b->r.max.y-t->b->r.min.y);
p.x+=t->b->r.max.x-t->b->r.min.x+2;
t->r=rectaddpt(t->r, Pt(2, 2));
}
else if(t->p){
t->r.max.y=p.y;
t->r.min.y=p.y-t->p->r.max.y;
p.x+=t->p->r.max.x;
}
else{
t->r.min.y=p.y-t->font->ascent;
t->r.max.y=t->r.min.y+t->font->height;
p.x+=t->wid;
}
t->r.max.x=p.x;
t->nextline=eline;
t=t->next;
if(t==eline) break;
p.x+=pl_space(t->space, p.x, indent);
}
p.y+=descent+LEAD;
}
return p.y;
}
void pl_rtdraw(Image *b, Rectangle r, Rtext *t, int yoffs){
Point offs;
Rectangle dr;
Rectangle cr;
cr=b->clipr;
replclipr(b, b->repl, r);
pl_clr(b, r);
offs=subpt(r.min, Pt(0, yoffs));
for(;t;t=t->next) if(!eqrect(t->r, Rect(0,0,0,0))){
dr=rectaddpt(t->r, offs);
if(dr.max.y>r.min.y
&& dr.min.y<r.max.y){
if(t->b){
// bitblt(b, dr.min, t->b, t->b->r, S|D);
draw(b, Rpt(dr.min, addpt(dr.min, subpt(t->b->r.max, t->b->r.min))), t->b, 0, t->b->r.min);
if(t->hot) border(b, insetrect(dr, -2), 1, display->black, ZP);
}
else if(t->p){
plmove(t->p, subpt(dr.min, t->p->r.min));
pldraw(t->p, b);
}
else{
string(b, dr.min, display->black, ZP, t->font, t->text);
if(t->hot)
line(b, Pt(dr.min.x, dr.max.y-1),
Pt(dr.max.x, dr.max.y-1),
Endsquare, Endsquare, 0,
display->black, ZP);
}
}
}
replclipr(b, b->repl, cr);
}
/*
* Reposition text already drawn in the window.
* We just move the pixels and update the positions of any
* enclosed panels
*/
void pl_reposition(Rtext *t, Image *b, Point p, Rectangle r){
Point offs;
pl_cpy(b, p, r);
offs=subpt(p, r.min);
for(;t;t=t->next)
if(!eqrect(t->r, Rect(0,0,0,0)) && !t->b && t->p)
plmove(t->p, offs);
}
/*
* Rectangle r of Image b contains an image of Rtext t, offset by oldoffs.
* Redraw the text to have offset yoffs.
*/
void pl_rtredraw(Image *b, Rectangle r, Rtext *t, int yoffs, int oldoffs){
int dy, size;
dy=oldoffs-yoffs;
size=r.max.y-r.min.y;
if(dy>=size || -dy>=size)
pl_rtdraw(b, r, t, yoffs);
else if(dy<0){
pl_reposition(t, b, r.min,
Rect(r.min.x, r.min.y-dy, r.max.x, r.max.y));
pl_rtdraw(b, Rect(r.min.x, r.max.y+dy, r.max.x, r.max.y),
t, yoffs+size+dy);
}
else if(dy>0){
pl_reposition(t, b, Pt(r.min.x, r.min.y+dy),
Rect(r.min.x, r.min.y, r.max.x, r.max.y-dy));
pl_rtdraw(b, Rect(r.min.x, r.min.y, r.max.x, r.min.y+dy), t, yoffs);
}
}
Rtext *pl_rthit(Rtext *t, int yoffs, Point p, Point ul){
if(t==0) return 0;
p.x-=ul.x;
p.y+=yoffs-ul.y;
while(t->nextline && t->nextline->topy<=p.y) t=t->nextline;
for(;t!=0;t=t->next){
if(t->topy>p.y) return 0;
if(ptinrect(p, t->r)) return t;
}
return 0;
}
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