ref: d2b51b153b7015614fda04bf30bee42afdbac230
dir: /dview.c/
#include <u.h>
#include <libc.h>
#include <draw.h>
#include <mouse.h>
#include <keyboard.h>
#include <thread.h>
#include <bio.h>
#include "a.h"
typedef struct Box Box;
typedef struct Link Link;
struct Box
{
Rectangle r;
Rectangle sr;
Image *b;
};
struct Link
{
Box *b;
Rectangle r;
char text[255];
};
enum
{
Padding = 4,
Scrollwidth = 12,
};
Channel *chan;
Dvec *defs;
Box **boxes;
usize nboxes;
Link links[1024];
usize nlinks;
Cols *cols;
Rectangle sr;
Rectangle scrollr;
Rectangle boxr;
int totalh;
int viewh;
int offset;
int scrollsize;
Box*
renderbox(Definition *d)
{
Box *b;
int i, l, n, w, mw, inlink, cl;
Point p, lp;
Image *c;
n = 0;
w = 0;
mw = 0;
l = strlen(d->text);
for(i = 0; i < l; i++){
if(d->text[i] == '\n'){
++n;
if(w > mw)
mw = w;
w = 0;
}else{
w += stringnwidth(font, d->text+i, 1);
}
}
b = emalloc(sizeof *b);
b->r = Rect(0, 0, Padding + mw + Padding, Padding+(n+1)*font->height+Padding);
b->b = allocimage(display, b->r, screen->chan, 0, DNofill);
draw(b->b, b->r, cols->back, nil, ZP);
p = Pt(Padding, Padding);
inlink = 0;
cl = 0;
for(i = 0; i < l; i++){
switch(d->text[i]){
case '\n':
p.x = Padding;
p.y += font->height;
break;
case '{':
cl = 0;
lp = p;
inlink = 1;
break;
case '}':
links[nlinks].b = b;
links[nlinks].r = Rpt(lp, addpt(p, Pt(0, font->height)));
links[nlinks].text[cl] = '\0';
nlinks += 1;
cl = 0;
inlink = 0;
break;
default:
c = cols->text;
if(inlink){
c = cols->focus;
links[nlinks].text[cl++] = d->text[i];
}
p = stringn(b->b, p, c, ZP, font, d->text + i, 1);
break;
}
}
return b;
}
void
layout(void)
{
Box *b;
int i;
Point p;
totalh = 0;
p = addpt(boxr.min, Pt(Padding, Padding));
for(i = 0; i < nboxes; i++){
b = boxes[i];
b->sr = rectaddpt(b->r, p);
p.y += Dy(b->r) + Padding;
totalh += Dy(b->r) + Padding;
}
scrollsize = 10*totalh/100.0;
for(i = 0; i < nlinks; i++)
links[i].r = rectaddpt(links[i].r, links[i].b->sr.min);
}
void
dviewset(Dvec *d)
{
Definition *def;
int i;
if(defs != nil){
for(i = 0; i < nboxes; i++){
freeimage(boxes[i]->b);
free(boxes[i]);
}
nboxes = 0;
for(i = 0; i < dvlen(defs); i++){
def = dvref(defs, i);
free(def->text);
free(def);
}
free(defs);
}
offset = 0;
nlinks = 0;
defs = d;
nboxes = dvlen(defs);
boxes = emalloc(nboxes * sizeof(Box*));
for(i = 0; i < nboxes; i++){
def = dvref(defs, i);
boxes[i] = renderbox(def);
}
layout();
}
void
dviewredraw(void)
{
Box *b;
Rectangle clipr, scrposr;
int i, h, y, ye, vmin, vmax;
clipr = screen->clipr;
draw(screen, sr, cols->back, nil, ZP);
draw(screen, scrollr, cols->scrl, nil, ZP);
border(screen, scrollr, 1, cols->text, ZP);
if(viewh < totalh){
h = ((double)viewh/totalh) * Dy(scrollr);
y = ((double)offset/totalh) * Dy(scrollr);
ye = scrollr.min.y + y + h - 1;
if(ye >= scrollr.max.y)
ye = scrollr.max.y - 1;
scrposr = Rect(scrollr.min.x + 1, scrollr.min.y + y + 1, scrollr.max.x - 1, ye);
}else
scrposr = insetrect(scrollr, -1);
draw(screen, scrposr, cols->back, nil, ZP);
replclipr(screen, 0, boxr);
vmin = boxr.min.y + offset;
vmax = boxr.max.y + offset;
if(boxes != nil){
for(i = 0; i < nboxes; i++){
b = boxes[i];
if(b->sr.min.y <= vmax && b->sr.max.y >= vmin)
draw(screen, rectaddpt(b->sr, Pt(0, -offset)), b->b, nil, ZP);
}
}
replclipr(screen, 0, clipr);
}
void
dviewresize(Rectangle r)
{
sr = r;
scrollr = sr;
scrollr.min.x += Padding;
scrollr.max.x = scrollr.min.x + Padding + Scrollwidth;
scrollr.max.y -= Padding;
boxr = sr;
boxr.min.x = scrollr.max.x + Padding;
boxr.max.x -= Padding;
boxr.max.y -= Padding;
viewh = Dy(boxr);
if(boxes != nil)
layout();
}
void
scroll(int d)
{
if(d < 0 && offset <= 0)
return;
if(d > 0 && offset + viewh > totalh)
return;
offset += d;
if(offset < 0)
offset = 0;
if((offset + viewh ) > totalh)
offset = totalh - viewh;
dviewredraw();
flushimage(display, 1);
}
void
clicklink(Point p)
{
int i;
p = addpt(p, Pt(0, offset));
for(i = 0; i < nlinks; i++){
if(ptinrect(p, links[i].r)){
nbsendp(chan, strdup(links[i].text));
return;
}
}
}
void
dviewmouse(Mouse m)
{
if(!ptinrect(m.xy, sr))
return;
if(m.buttons == 1)
clicklink(m.xy);
else if(m.buttons == 8)
scroll(-scrollsize);
else if(m.buttons == 16)
scroll(scrollsize);
}
void
dviewkey(Rune k)
{
switch(k){
case Kup:
scroll(-scrollsize);
break;
case Kdown:
scroll(scrollsize);
break;
case Kpgup:
scroll(-viewh);
break;
case Kpgdown:
scroll(viewh);
break;
case Khome:
scroll(-totalh);
break;
case Kend:
scroll(totalh);
break;
}
}
void
dviewinit(Channel *ch, Cols *c)
{
chan = ch;
defs = nil;
boxes = nil;
nboxes = 0;
nlinks = 0;
totalh = -1;
offset = 0;
cols = c;
}