More files related to user-level file servers.

Also add acme!

src/cmd/acme/scrl.c

@@ -0,0 +1,165 @@
+#include <u.h>
+#include <libc.h>
+#include <draw.h>
+#include <thread.h>
+#include <cursor.h>
+#include <mouse.h>
+#include <keyboard.h>
+#include <frame.h>
+#include <fcall.h>
+#include <plumb.h>
+#include "dat.h"
+#include "fns.h"
+
+static Image *scrtmp;
+
+static
+Rectangle
+scrpos(Rectangle r, uint p0, uint p1, uint tot)
+{
+	Rectangle q;
+	int h;
+
+	q = r;
+	h = q.max.y-q.min.y;
+	if(tot == 0)
+		return q;
+	if(tot > 1024*1024){
+		tot>>=10;
+		p0>>=10;
+		p1>>=10;
+	}
+	if(p0 > 0)
+		q.min.y += h*p0/tot;
+	if(p1 < tot)
+		q.max.y -= h*(tot-p1)/tot;
+	if(q.max.y < q.min.y+2){
+		if(q.min.y+2 <= r.max.y)
+			q.max.y = q.min.y+2;
+		else
+			q.min.y = q.max.y-2;
+	}
+	return q;
+}
+
+void
+scrlresize(void)
+{
+	freeimage(scrtmp);
+	scrtmp = allocimage(display, Rect(0, 0, 32, screen->r.max.y), screen->chan, 0, DNofill);
+	if(scrtmp == nil)
+		error("scroll alloc");
+}
+
+void
+textscrdraw(Text *t)
+{
+	Rectangle r, r1, r2;
+	Image *b;
+
+	if(t->w==nil || t!=&t->w->body)
+		return;
+	if(scrtmp == nil)
+		scrlresize();
+	r = t->scrollr;
+	b = scrtmp;
+	r1 = r;
+	r1.min.x = 0;
+	r1.max.x = Dx(r);
+	r2 = scrpos(r1, t->org, t->org+t->fr.nchars, t->file->b.nc);
+	if(!eqrect(r2, t->lastsr)){
+		t->lastsr = r2;
+		draw(b, r1, t->fr.cols[BORD], nil, ZP);
+		draw(b, r2, t->fr.cols[BACK], nil, ZP);
+		r2.min.x = r2.max.x-1;
+		draw(b, r2, t->fr.cols[BORD], nil, ZP);
+		draw(t->fr.b, r, b, nil, Pt(0, r1.min.y));
+/*flushimage(display, 1);*//*BUG?*/
+	}
+}
+
+void
+scrsleep(uint dt)
+{
+	Timer	*timer;
+	static Alt alts[3];
+
+	timer = timerstart(dt);
+	alts[0].c = timer->c;
+	alts[0].v = nil;
+	alts[0].op = CHANRCV;
+	alts[1].c = mousectl->c;
+	alts[1].v = &mousectl->m;
+	alts[1].op = CHANRCV;
+	alts[2].op = CHANEND;
+	for(;;)
+		switch(alt(alts)){
+		case 0:
+			timerstop(timer);
+			return;
+		case 1:
+			timercancel(timer);
+			return;
+		}
+}
+
+void
+textscroll(Text *t, int but)
+{
+	uint p0, oldp0;
+	Rectangle s;
+	int x, y, my, h, first;
+
+	s = insetrect(t->scrollr, 1);
+	h = s.max.y-s.min.y;
+	x = (s.min.x+s.max.x)/2;
+	oldp0 = ~0;
+	first = TRUE;
+	do{
+		flushimage(display, 1);
+		if(mouse->xy.x<s.min.x || s.max.x<=mouse->xy.x){
+			readmouse(mousectl);
+		}else{
+			my = mouse->xy.y;
+			if(my < s.min.y)
+				my = s.min.y;
+			if(my >= s.max.y)
+				my = s.max.y;
+			if(!eqpt(mouse->xy, Pt(x, my))){
+				moveto(mousectl, Pt(x, my));
+				readmouse(mousectl);		/* absorb event generated by moveto() */
+			}
+			if(but == 2){
+				y = my;
+				if(y > s.max.y-2)
+					y = s.max.y-2;
+				if(t->file->b.nc > 1024*1024)
+					p0 = ((t->file->b.nc>>10)*(y-s.min.y)/h)<<10;
+				else
+					p0 = t->file->b.nc*(y-s.min.y)/h;
+				if(oldp0 != p0)
+					textsetorigin(t, p0, FALSE);
+				oldp0 = p0;
+				readmouse(mousectl);
+				continue;
+			}
+			if(but == 1)
+				p0 = textbacknl(t, t->org, (my-s.min.y)/t->fr.font->height);
+			else
+				p0 = t->org+frcharofpt(&t->fr, Pt(s.max.x, my));
+			if(oldp0 != p0)
+				textsetorigin(t, p0, TRUE);
+			oldp0 = p0;
+			/* debounce */
+			if(first){
+				flushimage(display, 1);
+				sleep(200);
+				nbrecv(mousectl->c, &mousectl->m);
+				first = FALSE;
+			}
+			scrsleep(80);
+		}
+	}while(mouse->buttons & (1<<(but-1)));
+	while(mouse->buttons)
+		readmouse(mousectl);
+}