show a skull & crossbones cursor as a warning when deleting a window.

Notes:
Fri Mar 10 13:33:37 EST 2006 rsc
    i'm not convinced by this.  i'm sure that rob did away
    with the skull and crossbones for a reason and i don't
    want to have to go change this in the rios and sams 
    floating around.  
    
    i also didn't apply the pointsto change.  what if you
    move the cursor out of the window and back in?  
    if you checked it after the button came up then
    i think that might be okay.  even so, there's
    already a way to cancel (press another button).
    


Reference: /n/sources/patch/sorry/rio.bones
Date: Thu Mar  9 22:25:04 CET 2006
Reviewed-by: rsc

--- /sys/src/cmd/rio/dat.h	Thu Mar  9 18:43:58 2006
+++ /sys/src/cmd/rio/dat.h	Thu Mar  9 18:43:46 2006
@@ -310,6 +310,7 @@
 Cursor	boxcursor;
 Cursor	crosscursor;
 Cursor	sightcursor;
+Cursor	deletecursor;
 Cursor	whitearrow;
 Cursor	query;
 Cursor	*corners[9];
--- /sys/src/cmd/rio/data.c	Thu Mar  9 18:44:45 2006
+++ /sys/src/cmd/rio/data.c	Thu Mar  9 18:44:33 2006
@@ -46,6 +46,18 @@
 	 0x21, 0x84, 0x31, 0x8C, 0x0F, 0xF0, 0x00, 0x00, }
 };
 
+Cursor deletecursor = {
+	{-7, -7},
+	{0x00, 0x00, 0x00, 0x00, 0xC0, 0x03, 0xE7, 0xE7, 
+	 0xFF, 0xFF, 0xFF, 0xFF, 0x3F, 0xFC, 0x0F, 0xF0, 
+	 0x0F, 0xF0, 0x37, 0xEC, 0xF7, 0xEF, 0xF7, 0xEF, 
+	 0xE7, 0xE7, 0xC3, 0xC3, 0x00, 0x00, 0x00, 0x00,},
+	{0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0xC0, 0x03,
+	 0xE7, 0xE7, 0x3F, 0xFC, 0x0F, 0xF0, 0x0D, 0xB0,
+	 0x07, 0xE0, 0x06, 0x60, 0x37, 0xEC, 0xE4, 0x27,
+	 0xC3, 0xC3, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,}
+};
+
 Cursor whitearrow = {
 	{0, 0},
 	{0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFE, 0xFF, 0xFC, 
--- /sys/src/cmd/rio/rio.c	Thu Mar  9 18:45:43 2006
+++ /sys/src/cmd/rio/rio.c	Thu Mar  9 18:45:30 2006
@@ -517,7 +517,7 @@
 					scrolling = mouse->buttons;
 				else
 					scrolling = mouse->buttons && ptinrect(xy, winput->scrollr);
-				/* topped will be zero if window has been bottomed */
+				/* topped will be zero or less if window has been bottomed */
 				if(sending == FALSE && !scrolling && winborder(winput, mouse->xy) && winput->topped>0){
 					moving = TRUE;
 				}else if(inside && (scrolling || winput->mouseopen || (mouse->buttons&1)))
@@ -566,7 +566,7 @@
 				cornercursor(w, mouse->xy, 0);
 			/* we're not sending the event, but if button is down maybe we should */
 			if(mouse->buttons){
-				/* w->topped will be zero if window has been bottomed */
+				/* w->topped will be zero or less if window has been bottomed */
 				if(w==nil || (w==winput && w->topped>0)){
 					if(mouse->buttons & 1){
 						;
@@ -999,12 +999,12 @@
 }
 
 Window*
-pointto(int wait)
+pointto(int wait, Cursor *cursor)
 {
 	Window *w;
 
 	menuing = TRUE;
-	riosetcursor(&sightcursor, 1);
+	riosetcursor(cursor, 1);
 	while(mouse->buttons == 0)
 		readmouse(mousectl);
 	if(mouse->buttons == 4)
@@ -1018,6 +1018,8 @@
 				w = nil;
 			}
 			readmouse(mousectl);
+			if(w != nil && wpointto(mouse->xy) != w)
+				w = nil;
 		}
 	cornercursor(input, mouse->xy, 0);
 	moveto(mousectl, mouse->xy);	/* force cursor update; ugly */
@@ -1030,7 +1032,7 @@
 {
 	Window *w;
 
-	w = pointto(TRUE);
+	w = pointto(TRUE, &deletecursor);
 	if(w)
 		wsendctlmesg(w, Deleted, ZR, nil);
 }
@@ -1041,7 +1043,7 @@
 	Window *w;
 	Image *i;
 
-	w = pointto(TRUE);
+	w = pointto(TRUE, &sightcursor);
 	if(w == nil)
 		return;
 	i = sweep();
@@ -1056,7 +1058,7 @@
 	Image *i;
 	Rectangle r;
 
-	w = pointto(FALSE);
+	w = pointto(FALSE, &sightcursor);
 	if(w == nil)
 		return;
 	i = drag(w, &r);
@@ -1105,7 +1107,7 @@
 {
 	Window *w;
 
-	w = pointto(TRUE);
+	w = pointto(TRUE, &sightcursor);
 	if(w == nil)
 		return;
 	whide(w);