2010-01-12 Chris Allegretta <chrisa@asty.org>

        * move.c (do_page_up, do_page_down): Fix issues with not enough scrolling down/up
          and cursor centering.
        * winio.c (edit_scroll): Remove lots of needless checking of line length for
          soft wrapping code.
        * winio.c (edit_update) - Remove extra code for when updating with old_current outside
          of the new buffer boundary and centering issues.



git-svn-id: svn://svn.savannah.gnu.org/nano/trunk/nano@4473 35c25a1d-7b9e-4130-9fde-d3aeb78583b8

ChangeLog

+2010-01-12 Chris Allegretta <chrisa@asty.org>
+	* move.c (do_page_up, do_page_down): Fix issues with not enough scrolling down/up
+	  and cursor centering.
+	* winio.c (edit_scroll): Remove lots of needless checking of line length for 
+	  soft wrapping code.
+	* winio.c (edit_update) - Remove extra code for when updating with old_current outside
+	  of the new buffer boundary and centering issues.
+
 2010-01-05 Tito <farmatito@tiscali.it>
-	* search.c (update_history) - Fix bad length check causing search crash on armel platform.
+	* search.c (update_history): Fix bad length check causing search crash on armel platform.
 
 2010-01-04 Chris Allegretta <chrisa@asty.org>
-	* winio.c: edit_update, edit_redraw - Fix search not scrolling to the middle of the screen
+	* winio.c: edit_update, edit_redraw: Fix search not scrolling to the middle of the screen
 	  (reported by alpha@qzx.com) and places where we rely on maxrows but should not.
 
 2009-12-26 Jordi Mallach <jordi@gnu.org>

src/move.c

@@ -55,7 +55,8 @@ void do_page_up(void)
     /* If there's less than a page of text left on the screen, put the
      * cursor at the beginning of the first line of the file, and then
      * update the edit window. */
-    if (!ISSET(SOFTWRAP) && openfile->current->lineno <= editwinrows - 2) {
+    if (openfile->current->lineno == 1 || (!ISSET(SOFTWRAP) &&
+	openfile->current->lineno <= editwinrows - 2)) {
 	do_first_line();
 	return;
     }
@@ -92,7 +93,8 @@ openfile->current->lineno, strlenpt(openfile->current->data));
 #endif
 
     /* Scroll the edit window up a page. */
-    edit_scroll(UP_DIR, editwinrows - skipped - 2);
+    openfile->current_y = 0;
+    edit_update(NONE);
 }
 
 /* Move down one page. */
@@ -133,7 +135,8 @@ void do_page_down(void)
 	openfile->placewewant);
 
     /* Scroll the edit window down a page. */
-    edit_scroll(DOWN_DIR, editwinrows - 2);
+    openfile->current_y = 0;
+    edit_update(NONE);
 }
 
 #ifndef DISABLE_JUSTIFY
@@ -521,7 +524,7 @@ void do_up(
 #ifndef NANO_TINY
 		(ISSET(SMOOTH_SCROLL) || scroll_only) ? 1 :
 #endif
-		editwinrows / 2);
+		editwinrows / 2 + 1);
 
     /* If we're below the first line of the edit window, update the
      * line we were on before and the line we're on now.  The former
@@ -590,13 +593,15 @@ void do_down(
 #ifndef NANO_TINY
 	|| scroll_only
 #endif
-	)
+	) {
 	edit_scroll(DOWN_DIR,
 #ifndef NANO_TINY
 		(ISSET(SMOOTH_SCROLL) || scroll_only) ? 1 :
 #endif
-		editwinrows / 2);
+		editwinrows / 2 + 1);
 
+	edit_refresh_needed = TRUE;
+    }
     /* If we're above the last line of the edit window, update the line
      * we were on before and the line we're on now.  The former needs to
      * be redrawn if we're not on the first page, and the latter needs

src/winio.c

@@ -2988,12 +2988,9 @@ void edit_scroll(scroll_dir direction, ssize_t nlines)
 #ifdef DEBUG
 	   fprintf(stderr, "Softwrap: Entering check for extracuzsoft\n");
 #endif
-	for (i = editwinrows, foo = openfile->edittop; foo && i > 0; i--, foo = foo->next) {
-	    ssize_t len = strlenpt(foo->data) / COLS;
-	    if (len > 0)
-	        do_redraw = TRUE;
-	    i -= len;
-	}
+	for (i = maxrows, foo = openfile->edittop; foo && i > 0; i--, foo = foo->next)
+	    ;
+
 	if (foo) {
 	   extracuzsoft += strlenpt(foo->data) / COLS;
 #ifdef DEBUG
@@ -3001,7 +2998,6 @@ void edit_scroll(scroll_dir direction, ssize_t nlines)
 		(unsigned long) strlenpt(foo->data), (unsigned long) foo->lineno);
 #endif
 
-
 	    /* Now account for whether the edittop line itself is >COLS, if scrolling down */
 	   for (foo = openfile->edittop; foo && extracuzsoft > 0; nlines++) {
 		extracuzsoft -= 1 + strlenpt(foo->data) / COLS;
@@ -3013,13 +3009,6 @@ void edit_scroll(scroll_dir direction, ssize_t nlines)
 		foo = foo->next;
 	    }
 	}
-    } else if (ISSET(SOFTWRAP) && direction == UP_DIR) {
-	for (foo = openfile->edittop, i = editwinrows; foo && i > 0; i--, foo = foo->prev) {
-	    if (strlenpt(foo->data) / COLS > 0) {
-		do_redraw = TRUE;
-		break;
-	    }
-	}
     }
 
     /* Part 1: nlines is the number of lines we're going to scroll the
@@ -3039,11 +3028,14 @@ void edit_scroll(scroll_dir direction, ssize_t nlines)
 	    openfile->edittop = openfile->edittop->next;
 	}
 	/* Don't over-scroll on long lines */
-	if (ISSET(SOFTWRAP))
-	    i -= strlenpt(openfile->edittop->data) / COLS;
+	if (ISSET(SOFTWRAP)) {
+	    ssize_t len = strlenpt(openfile->edittop->data) / COLS;
+	    i -=  len;
+	    if (len > 0)
+		do_redraw = TRUE;
+	}
     }
 
-    compute_maxrows();
     /* Limit nlines to the number of lines we could scroll. */
     nlines -= i;
 
@@ -3052,7 +3044,7 @@ void edit_scroll(scroll_dir direction, ssize_t nlines)
      * call edit_refresh() beforehand if we need to. */
     if (nlines == 0 || do_redraw || nlines >= editwinrows) {
 	if (do_redraw || nlines >= editwinrows)
-	    edit_refresh();
+	    edit_refresh_needed = TRUE;
 	return;
     }
 
@@ -3128,6 +3120,10 @@ void edit_redraw(filestruct *old_current, size_t pww_save)
 	openfile->edittop->lineno || openfile->current->lineno >=
 	openfile->edittop->lineno + maxrows) {
 
+#ifdef DEBUG
+    fprintf(stderr, "edit_redraw(): line %lu was offscreen, oldcurrent = %lu edittop = %lu", openfile->current->lineno,
+                    old_current->lineno, openfile->edittop->lineno);
+#endif
 	filestruct *old_edittop = openfile->edittop;
 	ssize_t nlines;
 
@@ -3162,22 +3158,11 @@ void edit_redraw(filestruct *old_current, size_t pww_save)
 	 * then restore the original edittop. */
 	edit_update(CENTER);
 
-	nlines = openfile->edittop->lineno - old_edittop->lineno;
-
-	openfile->edittop = old_edittop;
-
 	/* Update old_current if we're not on the same page as
 	 * before. */
 	if (do_redraw)
 	    update_line(old_current, 0);
 
-	/* Scroll the edit window up or down until edittop is in range
-	 * of current. */
-	if (nlines < 0)
-	    edit_scroll(UP_DIR, -nlines);
-	else
-	    edit_scroll(DOWN_DIR, nlines);
-
 #ifndef NANO_TINY
 	/* If the mark is on, update all the lines between the old first
 	 * line or old last line of the edit window (depending on
@@ -3289,12 +3274,16 @@ void edit_update(update_type location)
     }
 
     for (; goal > 0 && foo->prev != NULL; goal--) {
-	if (ISSET(SOFTWRAP))
-	    goal -= 1 + strlenpt(foo->data) / COLS;
 	foo = foo->prev;
+	if (ISSET(SOFTWRAP) && foo)
+	    goal -= strlenpt(foo->data) / COLS;
     }
     openfile->edittop = foo;
+#ifdef DEBUG
+    fprintf(stderr, "edit_udpate(), setting edittop to lineno %d\n", openfile->edittop->lineno);
+#endif
     compute_maxrows();
+    edit_refresh_needed = TRUE;
 }
 
 /* Unconditionally redraw the entire screen. */