[lmi-commits] [lmi] master baa8825 5/6: Calculate the exact number of lines on the last page

[Greg Chicares]

branch: master
commit baa8825be4fe31b29616f9eeb932438e056825ec
Author: Gregory W. Chicares <address@hidden>
Commit: Gregory W. Chicares <address@hidden>

    Calculate the exact number of lines on the last page
---
 report_table.cpp | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/report_table.cpp b/report_table.cpp
index 9ef9522..b201d0b 100644
--- a/report_table.cpp
+++ b/report_table.cpp
@@ -205,6 +205,7 @@ paginator::paginator(int total_rows, int rows_per_group, 
int max_lines_per_page)
     // If there are zero rows of data, then one empty page is wanted.
     if(0 == total_rows_)
         {
+        lines_on_last_page_ = 0;
         page_count_ = 1;
         return;
         }
@@ -212,6 +213,13 @@ paginator::paginator(int total_rows, int rows_per_group, 
int max_lines_per_page)
     page_count_ = outward_quotient(total_rows_, rows_per_page_);
 
     int const rows_on_last_page = total_rows_ - (page_count_ - 1) * 
rows_per_page_;
+    int const full_groups_on_last_page = rows_on_last_page / rows_per_group_;
+    int const extra_rows_on_last_page  = rows_on_last_page % rows_per_group_;
+    lines_on_last_page_ =
+          lines_per_group_ * full_groups_on_last_page
+        + extra_rows_on_last_page
+        - (0 == extra_rows_on_last_page)
+        ;
 
     // Avoid widowing a partial group on the last page, by moving it
     // to the preceding page (which becomes the last) if there's room.
@@ -222,6 +230,8 @@ paginator::paginator(int total_rows, int rows_per_group, 
int max_lines_per_page)
         if(rows_on_last_page <= free_lines)
             {
             --page_count_;
+            // "+ 1": separator before antiwidowed partial group.
+            lines_on_last_page_ = lines_on_full_page_ + 1 + rows_on_last_page;
             }
         }
 }