ref: e51c4bc6e493a9cd0d9e9d7f1d24c57ae77bab65
dir: /sys/src/cmd/mothra/libpanel/rtext.c/
/*
* 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 */
#define BORD 2 /* extra border for images */
Rtext *pl_rtnew(Rtext **t, int space, int indent, int voff, Image *b, Panel *p, Font *f, char *s, int flags, void *user){
Rtext *new;
new=pl_emalloc(sizeof(Rtext));
new->flags=flags;
new->user=user;
new->space=space;
new->indent=indent;
new->voff=voff;
new->b=b;
new->p=p;
new->font=f;
new->text=s;
new->next=0;
new->nextline=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, int voff, Panel *p, void *user){
return pl_rtnew(t, space, indent, voff, 0, p, 0, 0, 1, user);
}
Rtext *plrtstr(Rtext **t, int space, int indent, int voff, Font *f, char *s, int flags, void *user){
return pl_rtnew(t, space, indent, voff, 0, 0, f, s, flags, user);
}
Rtext *plrtbitmap(Rtext **t, int space, int indent, int voff, Image *b, int flags, void *user){
return pl_rtnew(t, space, indent, voff, b, 0, 0, 0, flags, 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 width/height of the text
*/
Point pl_rtfmt(Rtext *t, int wid){
Rtext *tp, *eline;
int ascent, descent, x, space, a, d, w, topy, indent, maxwid;
Point p;
p=Pt(0,0);
eline=t;
maxwid=0;
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+BORD;
d=BORD;
w=tp->b->repl?wid-x:tp->b->r.max.x-tp->b->r.min.x+BORD*2;
}
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);
}
a-=tp->voff,d+=tp->voff;
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(tp==t){
if(a>ascent) ascent=a;
if(d>descent) descent=d;
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;
p.y+=t->voff;
if(t->b){
t->r.max.y=p.y+BORD;
t->r.min.y=p.y-(t->b->r.max.y-t->b->r.min.y)-BORD;
p.x+=t->b->repl?wid-p.x:(t->b->r.max.x-t->b->r.min.x)+BORD*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;
}
p.y-=t->voff;
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);
}
if(p.x>maxwid) maxwid=p.x;
p.y+=descent+LEAD;
}
return Pt(maxwid, p.y);
}
/*
* If we draw the text in a backup bitmap and copy it onto the screen,
* the bitmap pointers in all the subpanels point to the wrong bitmap.
* This code fixes them.
*/
void pl_stuffbitmap(Panel *p, Image *b){
p->b=b;
for(p=p->child;p;p=p->next)
pl_stuffbitmap(p, b);
}
void pl_rtdraw(Image *b, Rectangle r, Rtext *t, Point offs){
static Image *backup;
Point lp, sp;
Rectangle dr;
Image *bb;
bb = b;
if(backup==0 || backup->chan!=b->chan || rectinrect(r, backup->r)==0){
freeimage(backup);
backup=allocimage(display, bb->r, bb->chan, 0, DNofill);
}
if(backup)
b=backup;
pl_clr(b, r);
lp=ZP;
sp=ZP;
offs=subpt(r.min, offs);
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
&& dr.max.x>r.min.x
&& dr.min.x<r.max.x){
if(t->b){
draw(b, insetrect(dr, BORD), t->b, 0, t->b->r.min);
if(t->flags&PL_STR) {
line(b, Pt(dr.min.x, dr.min.y), Pt(dr.max.x, dr.max.y),
Endsquare, Endsquare, 0,
display->black, ZP);
line(b, Pt(dr.min.x, dr.max.y), Pt(dr.max.x, dr.min.y),
Endsquare, Endsquare, 0,
display->black, ZP);
}
if(t->flags&PL_SEL)
pl_highlight(b, dr);
}
else if(t->p){
plmove(t->p, subpt(dr.min, t->p->r.min));
pldraw(t->p, b);
if(b!=bb)
pl_stuffbitmap(t->p, bb);
}
else{
if(t->flags&PL_HOT)
string(b, dr.min, pl_blue, ZP, t->font, t->text);
else
string(b, dr.min, display->black, ZP, t->font, t->text);
if(t->flags&PL_SEL)
pl_highlight(b, dr);
if(t->flags&PL_STR){
int y = dr.max.y - t->font->height/2;
if(sp.y != y)
sp = Pt(dr.min.x, y);
line(b, sp, Pt(dr.max.x, y),
Endsquare, Endsquare, 0,
display->black, ZP);
sp = Pt(dr.max.x, y);
} else
sp = ZP;
lp = ZP;
continue;
}
lp = ZP;
sp = ZP;
}
}
if(b!=bb)
draw(bb, r, b, 0, r.min);
}
/*
* 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, Point offs, Point oldoffs, int dir){
int d, size;
if(dir==VERT){
d=oldoffs.y-offs.y;
size=r.max.y-r.min.y;
if(d>=size || -d>=size) /* move more than screenful */
pl_rtdraw(b, r, t, offs);
else if(d<0){ /* down */
pl_reposition(t, b, r.min,
Rect(r.min.x, r.min.y-d, r.max.x, r.max.y));
pl_rtdraw(b, Rect(r.min.x, r.max.y+d, r.max.x, r.max.y),
t, Pt(offs.x, offs.y+size+d));
}
else if(d>0){ /* up */
pl_reposition(t, b, Pt(r.min.x, r.min.y+d),
Rect(r.min.x, r.min.y, r.max.x, r.max.y-d));
pl_rtdraw(b, Rect(r.min.x, r.min.y, r.max.x, r.min.y+d),
t, offs);
}
}else{ /* dir==HORIZ */
d=oldoffs.x-offs.x;
size=r.max.x-r.min.x;
if(d>=size || -d>=size) /* move more than screenful */
pl_rtdraw(b, r, t, offs);
else if(d<0){ /* right */
pl_reposition(t, b, r.min,
Rect(r.min.x-d, r.min.y, r.max.x, r.max.y));
pl_rtdraw(b, Rect(r.max.x+d, r.min.y, r.max.x, r.max.y),
t, Pt(offs.x+size+d, offs.y));
}
else if(d>0){ /* left */
pl_reposition(t, b, Pt(r.min.x+d, r.min.y),
Rect(r.min.x, r.min.y, r.max.x-d, r.max.y));
pl_rtdraw(b, Rect(r.min.x, r.min.y, r.min.x+d, r.max.y),
t, offs);
}
}
}
Rtext *pl_rthit(Rtext *t, Point offs, Point p, Point ul){
Rectangle r;
Point lp;
if(t==0) return 0;
p.x+=offs.x-ul.x;
p.y+=offs.y-ul.y;
while(t->nextline && t->nextline->topy<=p.y) t=t->nextline;
lp=ZP;
for(;t!=0;t=t->next){
if(t->topy>p.y) return 0;
r = t->r;
if((t->flags&PL_HOT) != 0 && t->b == nil && t->p == nil){
if(lp.y == r.max.y && lp.x < r.min.x)
r.min.x=lp.x;
lp=r.max;
} else
lp=ZP;
if(ptinrect(p, r)) return t;
}
return 0;
}
void plrtseltext(Rtext *t, Rtext *s, Rtext *e){
while(t){
t->flags &= ~PL_SEL;
t = t->next;
}
if(s==0 || e==0)
return;
for(t=s; t!=0 && t!=e; t=t->next)
;
if(t==e){
for(t=s; t!=e; t=t->next)
t->flags |= PL_SEL;
}else{
for(t=e; t!=s; t=t->next)
t->flags |= PL_SEL;
}
t->flags |= PL_SEL;
}
char *plrtsnarftext(Rtext *w){
char *b, *p, *e, *t;
int n;
b=p=e=0;
for(; w; w = w->next){
if((w->flags&PL_SEL)==0 || w->text==0)
continue;
n = strlen(w->text)+64;
if(p+n >= e){
n = (p+n+64)-b;
t = pl_erealloc(b, n);
p = t+(p-b);
e = t+n;
b = t;
}
if(w->space == 0)
p += sprint(p, "%s", w->text);
else if(w->space > 0)
p += sprint(p, " %s", w->text);
else if(PL_OP(w->space) == PL_TAB)
p += sprint(p, "\t%s", w->text);
if(w->nextline == w->next)
p += sprint(p, "\n");
}
return b;
}