Import sources from 2011-03-30 iso image

1 files changed, 158 insertions, 0 deletions

diff --git a/sys/src/cmd/acme/scrl.c b/sys/src/cmd/acme/scrl.c
new file mode 100755
index 000000000..757974067
--- /dev/null
+++ b/sys/src/cmd/acme/scrl.c
@@ -0,0 +1,158 @@
+#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->nchars, t->file->nc);
+	if(!eqrect(r2, t->lastsr)){
+		t->lastsr = r2;
+		draw(b, r1, t->cols[BORD], nil, ZP);
+		draw(b, r2, t->cols[BACK], nil, ZP);
+		r2.min.x = r2.max.x-1;
+		draw(b, r2, t->cols[BORD], nil, ZP);
+		draw(t->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->Mouse;
+	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);
+		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;
+			p0 = (vlong)t->file->nc*(y-s.min.y)/h;
+			if(p0 >= t->q1)
+				p0 = textbacknl(t, p0, 2);
+			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->font->height);
+		else
+			p0 = t->org+frcharofpt(t, 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->Mouse);
+			first = FALSE;
+		}
+		scrsleep(80);
+	}while(mouse->buttons & (1<<(but-1)));
+	while(mouse->buttons)
+		readmouse(mousectl);
+}