ref: 2c9e3861a54e22498fb2e3226defe4393b20b202
dir: /sys/src/cmd/mothra/libpanel/textview.c/
/*
* Fonted text viewer, calls out to code in rtext.c
*
* Should redo this to copy the already-visible parts on scrolling & only
* update the newly appearing stuff -- then the offscreen assembly bitmap can go away.
*/
#include <u.h>
#include <libc.h>
#include <draw.h>
#include <event.h>
#include <panel.h>
#include "pldefs.h"
typedef struct Textview Textview;
struct Textview{
void (*hit)(Panel *, int, Rtext *); /* call back to user on hit */
Rtext *text; /* text */
Point offs; /* offset of left/top of screen */
Rtext *hitword; /* text to hilite */
Rtext *hitfirst; /* first word in range select */
int twid; /* text width (visible) */
int thgt; /* text height (total) */
int maxwid; /* width of longest line */
Point minsize; /* smallest acceptible window size */
int buttons;
};
void pl_setscrpos(Panel *p, Textview *tp, Rectangle r){
Panel *sb;
int lo, hi;
lo=tp->offs.y;
hi=lo+r.max.y-r.min.y; /* wrong? */
sb=p->yscroller;
if(sb && sb->setscrollbar)
sb->setscrollbar(sb, lo, hi, tp->thgt);
lo=tp->offs.x;
hi=lo+r.max.x-r.min.x;
sb=p->xscroller;
if(sb && sb->setscrollbar)
sb->setscrollbar(sb, lo, hi, tp->maxwid);
}
void pl_drawtextview(Panel *p){
int twid;
Rectangle r;
Textview *tp;
Point size;
tp=p->data;
r=pl_outline(p->b, p->r, UP);
twid=r.max.x-r.min.x;
if(twid!=tp->twid){
tp->twid=twid;
size=pl_rtfmt(tp->text, tp->twid);
p->scr.size.x=tp->maxwid=size.x;
p->scr.size.y=tp->thgt=size.y;
}
p->scr.pos = tp->offs;
pl_rtdraw(p->b, r, tp->text, tp->offs);
pl_setscrpos(p, tp, r);
}
/*
* If t is a panel word, pass the mouse event on to it
*/
void pl_passon(Rtext *t, Mouse *m){
if(t && t->b==0 && t->p!=0)
plmouse(t->p, m);
}
int pl_hittextview(Panel *p, Mouse *m){
Rtext *oldhitword, *oldhitfirst;
int hitme, oldstate;
Point ul, size;
Textview *tp;
tp=p->data;
hitme=0;
oldstate=p->state;
oldhitword=tp->hitword;
oldhitfirst=tp->hitfirst;
if(oldhitword==oldhitfirst)
pl_passon(oldhitword, m);
if(m->buttons&OUT)
p->state=UP;
else if(m->buttons&7){
p->state=DOWN;
tp->buttons=m->buttons;
if(oldhitword==0 || oldhitword->p==0 || (oldhitword->p->flags&REMOUSE)==0){
ul=p->r.min;
size=subpt(p->r.max, p->r.min);
pl_interior(p->state, &ul, &size);
tp->hitword=pl_rthit(tp->text, tp->offs, m->xy, ul);
if(tp->hitword==0)
if(oldhitword!=0 && oldstate==DOWN)
tp->hitword=oldhitword;
else
tp->hitfirst=0;
if(tp->hitword!=0 && oldstate!=DOWN)
tp->hitfirst=tp->hitword;
}
}
else{
if(p->state==DOWN) hitme=1;
p->state=UP;
}
if(tp->hitfirst!=oldhitfirst || tp->hitword!=oldhitword){
plrtseltext(tp->text, tp->hitword, tp->hitfirst);
pl_drawtextview(p);
if(tp->hitword==tp->hitfirst)
pl_passon(tp->hitword, m);
}
if(hitme && tp->hit && tp->hitword!=0 && tp->hitword==tp->hitfirst){
plrtseltext(tp->text, 0, 0);
pl_drawtextview(p);
tp->hit(p, tp->buttons, tp->hitword);
tp->hitword=0;
tp->hitfirst=0;
}
return 0;
}
void pl_scrolltextview(Panel *p, int dir, int buttons, int num, int den){
int xoffs, yoffs;
Point ul, size;
Textview *tp;
Rectangle r;
tp=p->data;
ul=p->r.min;
size=subpt(p->r.max, p->r.min);
pl_interior(p->state, &ul, &size);
if(dir==VERT){
switch(buttons){
default:
SET(yoffs);
break;
case 1: /* left -- top moves to pointer */
yoffs=(vlong)tp->offs.y-num*size.y/den;
if(yoffs<0) yoffs=0;
break;
case 2: /* middle -- absolute index of file */
yoffs=(vlong)tp->thgt*num/den;
break;
case 4: /* right -- line pointed at moves to top */
yoffs=tp->offs.y+(vlong)num*size.y/den;
if(yoffs>tp->thgt) yoffs=tp->thgt;
break;
}
if(yoffs!=tp->offs.y){
r=pl_outline(p->b, p->r, p->state);
pl_rtredraw(p->b, r, tp->text,
Pt(tp->offs.x, yoffs), tp->offs, dir);
p->scr.pos.y=tp->offs.y=yoffs;
pl_setscrpos(p, tp, r);
}
}else{ /* dir==HORIZ */
switch(buttons){
default:
SET(xoffs);
break;
case 1: /* left */
xoffs=(vlong)tp->offs.x-num*size.x/den;
if(xoffs<0) xoffs=0;
break;
case 2: /* middle */
xoffs=(vlong)tp->maxwid*num/den;
break;
case 4: /* right */
xoffs=tp->offs.x+(vlong)num*size.x/den;
if(xoffs>tp->maxwid) xoffs=tp->maxwid;
break;
}
if(xoffs!=tp->offs.x){
r=pl_outline(p->b, p->r, p->state);
pl_rtredraw(p->b, r, tp->text,
Pt(xoffs, tp->offs.y), tp->offs, dir);
p->scr.pos.x=tp->offs.x=xoffs;
pl_setscrpos(p, tp, r);
}
}
}
void pl_typetextview(Panel *g, Rune c){
USED(g, c);
}
Point pl_getsizetextview(Panel *p, Point children){
USED(children);
return pl_boxsize(((Textview *)p->data)->minsize, p->state);
}
void pl_childspacetextview(Panel *g, Point *ul, Point *size){
USED(g, ul, size);
}
/*
* Priority depends on what thing inside the panel we're pointing at.
*/
int pl_pritextview(Panel *p, Point xy){
Point ul, size;
Textview *tp;
Rtext *h;
tp=p->data;
ul=p->r.min;
size=subpt(p->r.max, p->r.min);
pl_interior(p->state, &ul, &size);
h=pl_rthit(tp->text, tp->offs, xy, ul);
if(h && h->b==0 && h->p!=0){
p=pl_ptinpanel(xy, h->p);
if(p) return p->pri(p, xy);
}
return PRI_NORMAL;
}
char* pl_snarftextview(Panel *p){
return plrtsnarftext(((Textview *)p->data)->text);
}
void plinittextview(Panel *v, int flags, Point minsize, Rtext *t, void (*hit)(Panel *, int, Rtext *)){
Textview *tp;
tp=v->data;
v->flags=flags|LEAF;
v->state=UP;
v->draw=pl_drawtextview;
v->hit=pl_hittextview;
v->type=pl_typetextview;
v->getsize=pl_getsizetextview;
v->childspace=pl_childspacetextview;
v->kind="textview";
v->pri=pl_pritextview;
tp->hit=hit;
tp->minsize=minsize;
tp->text=t;
tp->offs=ZP;
tp->hitfirst=0;
tp->hitword=0;
v->scroll=pl_scrolltextview;
v->snarf=pl_snarftextview;
tp->twid=-1;
tp->maxwid=0;
v->scr.pos=Pt(0,0);
v->scr.size=Pt(0,1);
}
Panel *pltextview(Panel *parent, int flags, Point minsize, Rtext *t, void (*hit)(Panel *, int, Rtext *)){
Panel *v;
v=pl_newpanel(parent, sizeof(Textview));
plinittextview(v, flags, minsize, t, hit);
return v;
}
int plgetpostextview(Panel *p){
return ((Textview *)p->data)->offs.y;
}
void plsetpostextview(Panel *p, int yoffs){
((Textview *)p->data)->offs.y=yoffs;
pldraw(p, p->b);
}