From 41b3ec49a597bdc8b158dcc072f6a6043fd03ffd Mon Sep 17 00:00:00 2001
From: handa <handa>
Date: Wed, 17 Mar 2004 07:41:46 +0000
Subject: [PATCH] (update_selection): Fix for the case that the selected
 region is expanded to the opposite direction.
 (ButtonMoveProc): Likewise. (main): Use alloca instead of
 malloc for allocating menu names. Free several memory areas
 and GCs.

---
 example/medit.c |   89 ++++++++++++++++++++++++++++++++++++++-----------------
 1 file changed, 62 insertions(+), 27 deletions(-)

diff --git a/example/medit.c b/example/medit.c
index affd64c..c7736fb 100644
--- a/example/medit.c
+++ b/example/medit.c
@@ -498,28 +498,28 @@ update_selection ()
 
   if (from < top.from)
     {
-      GLYPH_INFO (bol (from, 0), from, info);
-      sel_start.ascent = -info.this.y;
-      sel_start.from = info.line_from;
-      sel_start.to = info.line_to;
-      TEXT_EXTENTS (from, top.from, rect);      
-      sel_start.y0 = - rect.height;
-      sel_start.y1 = sel_start.y0 + info.this.height;
+      int pos = bol (from, 0);
+
+      TEXT_EXTENTS (pos, top.from, rect);
+      sel_start.y0 = top.y0 - rect.height;
+      sel_start.ascent = - rect.y;
+      GLYPH_INFO (pos, from, info);
+      if (pos < info.line_from)
+	sel_start.y0 += - rect.y + info.y + info.this.y;
     }
   else
     {
       GLYPH_INFO (top.from, from, info);
       sel_start.y0 = top.ascent + info.y + info.this.y;
-      sel_start.y1 = sel_start.y0 + info.this.height;
-      sel_start.ascent = -info.this.y;
-      sel_start.from = info.line_from;
-      sel_start.to = info.line_to;
     }
+  sel_start.ascent = -info.this.y;
+  sel_start.y1 = sel_start.y0 + info.this.height;
+  sel_start.from = info.line_from;
+  sel_start.to = info.line_to;
 
   if (to <= sel_start.to)
     {
       sel_end = sel_start;
-      to = bol (to - 1, 1) - 1;
       if (to >= sel_end.to)
 	{
 	  GLYPH_INFO (sel_start.from, to, info);
@@ -529,7 +529,6 @@ update_selection ()
     }
   else
     {
-      to = bol (to - 1, 1) - 1;
       GLYPH_INFO (sel_start.from, to, info);
       sel_end.y0 = sel_start.y0 + sel_start.ascent + info.y + info.this.y;
       sel_end.y1 = sel_end.y0 + info.this.height;
@@ -1143,25 +1142,61 @@ ButtonMoveProc (Widget w, XEvent *event, String *str, Cardinal *num)
 
       if (cursor.from == from)
 	{
-	  /* Start position of selection changed.  */
-	  select_region (pos, to);
-	  if (pos > from)
-	    /* Shrunken.  Previous selection face must be cleared.  */
-	    redraw (start_y0, sel_start.y1, 1, 0);
+	  /* Starting position changed.  */
+	  if (pos <= from)
+	    {
+	      /* Enlarged.  We can simply overdraw.  */
+	      select_region (pos, to);
+	      redraw (sel_start.y0, start_y1, 0, 0);
+	    }
+	  else if (pos < to)
+	    {
+	      /* Shrunken.  Previous selection face must be cleared.  */
+	      select_region (pos, to);
+	      redraw (start_y0, sel_start.y1, 1, 0);
+	    }
+	  else if (pos == to)
+	    {
+	      /* Shrunken to zero.  */
+	      XtDisownSelection (w, XA_PRIMARY, CurrentTime);
+	      mtext_detach_property (selection);
+	      redraw (start_y0, end_y1, 1, 0);
+	    }
 	  else
-	    /* Enlarged.  We can simply overdraw.  */
-	    redraw (sel_start.y0, start_y1, 0, 0);
+	    {
+	      /* Full update is necessary.  */
+	      select_region (to, pos);
+	      redraw (start_y0, sel_end.y1, 1, 0);
+	    }
 	}
       else
 	{
-	  /* End position of selection changed.  */
-	  select_region (from, pos);
-	  if (pos < to)
-	    /* Shrunken.  Previous selection face must be cleared.  */
-	    redraw (sel_end.y0, end_y1, 1, 0);
+	  /* Ending position changed.  */
+	  if (pos < from)
+	    {
+	      /* Full update is necessary.  */
+	      select_region (pos, from);
+	      redraw (sel_start.y0, end_y1, 1, 0);
+	    }
+	  else if (pos == from)
+	    {
+	      /* Shrunken to zero.  */
+	      XtDisownSelection (w, XA_PRIMARY, CurrentTime);
+	      mtext_detach_property (selection);
+	      redraw (start_y0, end_y1, 1, 0);
+	    }
+	  else if (pos < to)
+	    {
+	      /* Shrunken.  Previous selection face must be cleared.  */
+	      select_region (from, pos);
+	      redraw (sel_end.y0, end_y1, 1, 0);
+	    }
 	  else
-	    /* Enlarged.  We can simply overdraw.  */
-	    redraw (end_y0, sel_end.y1, 0, 0);
+	    {
+	      /* Enlarged.  We can simply overdraw.  */
+	      select_region (from, pos);
+	      redraw (end_y0, sel_end.y1, 0, 0);
+	    }
 	}
     }
   else
-- 
1.7.10.4