Changeset aa2f33b3 for functions.c

Timestamp:

Jul 16, 2002, 9:55:47 PM (22 years ago)

Author:

Erik Nygren <nygren@mit.edu>

Branches:

master, barnowl_perlaim, debian, owl, release-1.10, release-1.4, release-1.5, release-1.6, release-1.7, release-1.8, release-1.9

Children:

f2e36b5

Parents:

e50cd56

Message:

	Variables now have a summary and a long description.
	        Only the summary is shown with help.
		The long description is shown with "show variable foo".
        Fix the scrolling bug where we would sometimes fail to scroll
             the screen down, leaving the current message off
             the bottom of the screen.
        Added a 'scrollmode' variable which determines how the screen
	     will scroll as the cursor moves.  The default behaves
	     identically to previous versions of owl.
             The following modes are supported:
	     normal      - This is the owl default.  Scrolling happens
	                   when it needs to, and an attempt is made to
	                   keep the current message roughly near
	                   the middle of the screen.  (default)
	     top         - The current message will always be the
	                   the top message displayed.
	     neartop     - The current message will be one down
	                   from the top message displayed,
	                   where possible.
	     center      - An attempt is made to keep the current
	                   message near the center of the screen.
	     paged       - The top message displayed only changes
	                   when user moves the cursor to the top
	                   or bottom of the screen.  When it moves,
	                   the screen will be paged up or down and
	                   the cursor will be near the top or
	                   the bottom.
	     pagedcenter - The top message displayed only changes
	                   when user moves the cursor to the top
	                   or bottom of the screen.  When it moves,
	                   the screen will be paged up or down and
	                   the cursor will be near the center.

File:

• functions.c (modified) (5 diffs)

functions.c

@@ -712 +712 @@
 
 void owl_function_calculate_topmsg(int direction) {
-  int recwinlines, y, savey, i, j, topmsg, curmsg, foo;
-  owl_mainwin *mw;
+  int recwinlines, topmsg, curmsg;
   owl_view *v;
 
-  mw=owl_global_get_mainwin(&g);
-
+  v=owl_global_get_current_view(&g);
+  curmsg=owl_global_get_curmsg(&g);
   topmsg=owl_global_get_topmsg(&g);
-  curmsg=owl_global_get_curmsg(&g);
-  v=owl_global_get_current_view(&g);
   recwinlines=owl_global_get_recwin_lines(&g);
 
@@ -726 +723 @@
     return;
   }
+
+  switch (owl_global_get_scrollmode(&g)) {
+  case OWL_SCROLLMODE_TOP:
+    topmsg = owl_function_calculate_topmsg_top(direction, v, curmsg,
+                                               topmsg, recwinlines);
+    break;
+  case OWL_SCROLLMODE_NEARTOP:
+    topmsg = owl_function_calculate_topmsg_neartop(direction, v, curmsg, 
+                                                   topmsg, recwinlines);
+    break;
+  case OWL_SCROLLMODE_CENTER:
+    topmsg = owl_function_calculate_topmsg_center(direction, v, curmsg,
+                                                  topmsg, recwinlines);
+    break;
+  case OWL_SCROLLMODE_PAGED:
+    topmsg = owl_function_calculate_topmsg_paged(direction, v, curmsg, 
+                                                 topmsg, recwinlines, 0);
+    break;
+  case OWL_SCROLLMODE_PAGEDCENTER:
+    topmsg = owl_function_calculate_topmsg_paged(direction, v, curmsg, 
+                                                 topmsg, recwinlines, 1);
+    break;
+  case OWL_SCROLLMODE_NORMAL:
+  default:
+    topmsg = owl_function_calculate_topmsg_normal(direction, v, curmsg,
+                                                  topmsg, recwinlines);
+  }
+  owl_global_set_topmsg(&g, topmsg);
+}
+
+/* Returns what the new topmsg should be.  
+ * Passed the last direction of movement, 
+ * the current view,
+ * the current message number in the view,
+ * the top message currently being displayed,
+ * and the number of lines in the recwin.
+ */
+int owl_function_calculate_topmsg_top(int direction, owl_view *v, int curmsg, int topmsg, int recwinlines) {
+  return curmsg;
+}
+
+int owl_function_calculate_topmsg_neartop(int direction, owl_view *v, int curmsg, int topmsg, int recwinlines) {
+  if (curmsg>0 
+      && (owl_message_get_numlines(owl_view_get_element(v, curmsg-1))
+          <  recwinlines/2)) {
+    return curmsg-1;
+  } else {
+    return curmsg;
+  }
+}
+  
+int owl_function_calculate_topmsg_center(int direction, owl_view *v, int curmsg, int topmsg, int recwinlines) {
+  int i, last, lines;
+
+  last = curmsg;
+  lines = 0;
+  for (i=curmsg-1; i>=0; i--) {
+    lines += owl_message_get_numlines(owl_view_get_element(v, i));
+    if (lines > recwinlines/2) break;
+    last = i;
+  }
+  return last;
+}
+  
+int owl_function_calculate_topmsg_paged(int direction, owl_view *v, int curmsg, int topmsg, int recwinlines, int center_on_page) {
+  int i, last, lines, savey;
+  
+  /* If we're off the top of the screen, scroll up such that the 
+   * curmsg is near the botton of the screen. */
+  if (curmsg < topmsg) {
+    last = curmsg;
+    lines = 0;
+    for (i=curmsg; i>=0; i--) {
+      lines += owl_message_get_numlines(owl_view_get_element(v, i));
+      if (lines > recwinlines) break;
+    last = i;
+    }
+    if (center_on_page) {
+      return owl_function_calculate_topmsg_center(direction, v, curmsg, 0, recwinlines);
+    } else {
+      return last;
+    }
+  }
+
+  /* Find number of lines from top to bottom of curmsg (store in savey) */
+  savey=0;
+  for (i=topmsg; i<=curmsg; i++) {
+    savey+=owl_message_get_numlines(owl_view_get_element(v, i));
+  }
+
+  /* if we're off the bottom of the screen, scroll down */
+  if (savey > recwinlines) {
+    if (center_on_page) {
+      return owl_function_calculate_topmsg_center(direction, v, curmsg, 0, recwinlines);
+    } else {
+      return curmsg;
+    }
+  }
+
+  /* else just stay as we are... */
+  return topmsg;
+}
+
+
+int owl_function_calculate_topmsg_normal(int direction, owl_view *v, int curmsg, int topmsg, int recwinlines) {
+  int savey, j, i, foo, y;
   
   /* Find number of lines from top to bottom of curmsg (store in savey) */
@@ -761 +864 @@
       }
       if (j<0) j=0;
-      owl_global_set_topmsg(&g, j);
-      return;
+      return j;
     }
   }
@@ -778 +880 @@
         j--;
       }
-      owl_global_set_topmsg(&g, j+1);
-      return;
-    }
-  }
+      return j+1;
+    }
+  }
+
+  return topmsg;
 }
 
@@ -1219 +1322 @@
       "Variables: (use 'show variable <name>' for details)\n");
   owl_variable_dict_get_names(owl_global_get_vardict(&g), &varnames);
-  owl_variable_get_summaryheader(&fm);
   numvarnames = owl_list_get_size(&varnames);
   for (i=0; i<numvarnames; i++) {
     varname = owl_list_get_element(&varnames, i);
     if (varname && varname[0]!='_') {
-      owl_variable_get_summary(owl_global_get_vardict(&g), varname, &fm);
+      owl_variable_describe(owl_global_get_vardict(&g), varname, &fm);
     }
   }