Initial revision

src/libframe/frdraw.c

@@ -0,0 +1,176 @@
+#include <u.h>
+#include <libc.h>
+#include <draw.h>
+#include <mouse.h>
+#include <frame.h>
+
+void
+_frredraw(Frame *f, Point pt)
+{
+	Frbox *b;
+	int nb;
+	/* static int x; */
+
+	for(nb=0,b=f->box; nb<f->nbox; nb++, b++){
+		_frcklinewrap(f, &pt, b);
+		if(b->nrune >= 0){
+			string(f->b, pt, f->cols[TEXT], ZP, f->font, (char *)b->ptr);
+		}
+		pt.x += b->wid;
+	}
+}
+
+static int
+nbytes(char *s0, int nr)
+{
+	char *s;
+	Rune r;
+
+	s = s0;
+	while(--nr >= 0)
+		s += chartorune(&r, s);
+	return s-s0;
+}
+
+void
+frdrawsel(Frame *f, Point pt, ulong p0, ulong p1, int issel)
+{
+	Image *back, *text;
+
+	if(f->ticked)
+		frtick(f, frptofchar(f, f->p0), 0);
+
+	if(p0 == p1){
+		frtick(f, pt, issel);
+		return;
+	}
+
+	if(issel){
+		back = f->cols[HIGH];
+		text = f->cols[HTEXT];
+	}else{
+		back = f->cols[BACK];
+		text = f->cols[TEXT];
+	}
+
+	frdrawsel0(f, pt, p0, p1, back, text);
+}
+
+void
+frdrawsel0(Frame *f, Point pt, ulong p0, ulong p1, Image *back, Image *text)
+{
+	Frbox *b;
+	int nb, nr, w, x, trim;
+	Point qt;
+	uint p;
+	char *ptr;
+
+	p = 0;
+	b = f->box;
+	trim = 0;
+	for(nb=0; nb<f->nbox && p<p1; nb++){
+		nr = b->nrune;
+		if(nr < 0)
+			nr = 1;
+		if(p+nr <= p0)
+			goto Continue;
+		if(p >= p0){
+			qt = pt;
+			_frcklinewrap(f, &pt, b);
+			if(pt.y > qt.y)
+				draw(f->b, Rect(qt.x, qt.y, f->r.max.x, pt.y), back, nil, qt);
+		}
+		ptr = (char*)b->ptr;
+		if(p < p0){	/* beginning of region: advance into box */
+			ptr += nbytes(ptr, p0-p);
+			nr -= (p0-p);
+			p = p0;
+		}
+		trim = 0;
+		if(p+nr > p1){	/* end of region: trim box */
+			nr -= (p+nr)-p1;
+			trim = 1;
+		}
+		if(b->nrune<0 || nr==b->nrune)
+			w = b->wid;
+		else
+			w = stringnwidth(f->font, ptr, nr);
+		x = pt.x+w;
+		if(x > f->r.max.x)
+			x = f->r.max.x;
+		draw(f->b, Rect(pt.x, pt.y, x, pt.y+f->font->height), back, nil, pt);
+		if(b->nrune >= 0)
+			stringn(f->b, pt, text, ZP, f->font, ptr, nr);
+		pt.x += w;
+	    Continue:
+		b++;
+		p += nr;
+	}
+	/* if this is end of last plain text box on wrapped line, fill to end of line */
+	if(p1>p0 &&  b>f->box && b<f->box+f->nbox && b[-1].nrune>0 && !trim){
+		qt = pt;
+		_frcklinewrap(f, &pt, b);
+		if(pt.y > qt.y)
+			draw(f->b, Rect(qt.x, qt.y, f->r.max.x, pt.y), back, nil, qt);
+	}
+}
+
+void
+frtick(Frame *f, Point pt, int ticked)
+{
+	Rectangle r;
+
+	if(f->ticked==ticked || f->tick==0 || !ptinrect(pt, f->r))
+		return;
+	pt.x--;	/* looks best just left of where requested */
+	r = Rect(pt.x, pt.y, pt.x+FRTICKW, pt.y+f->font->height);
+	if(ticked){
+		draw(f->tickback, f->tickback->r, f->b, nil, pt);
+		draw(f->b, r, f->tick, nil, ZP);
+	}else
+		draw(f->b, r, f->tickback, nil, ZP);
+	f->ticked = ticked;
+}
+
+Point
+_frdraw(Frame *f, Point pt)
+{
+	Frbox *b;
+	int nb, n;
+
+	for(b=f->box,nb=0; nb<f->nbox; nb++, b++){
+		_frcklinewrap0(f, &pt, b);
+		if(pt.y == f->r.max.y){
+			f->nchars -= _frstrlen(f, nb);
+			_frdelbox(f, nb, f->nbox-1);
+			break;
+		}
+		if(b->nrune > 0){
+			n = _frcanfit(f, pt, b);
+			if(n == 0)
+				drawerror(f->display, "draw: _frcanfit==0");
+			if(n != b->nrune){
+				_frsplitbox(f, nb, n);
+				b = &f->box[nb];
+			}
+			pt.x += b->wid;
+		}else{
+			if(b->bc == '\n'){
+				pt.x = f->r.min.x;
+				pt.y+=f->font->height;
+			}else
+				pt.x += _frnewwid(f, pt, b);
+		}
+	}
+	return pt;
+}
+
+int
+_frstrlen(Frame *f, int nb)
+{
+	int n;
+
+	for(n=0; nb<f->nbox; nb++)
+		n += NRUNE(&f->box[nb]);
+	return n;
+}