[gnumeric] diff: move sheetview to the location of a given difference.

[Morten Welinder <mortenw src gnome org>]

commit 9f9d9615c59502f3ceb471f63bbbde08d55e5728
Author: Morten Welinder <terra gnome org>
Date:   Mon Apr 9 21:18:42 2018 -0400

    diff: move sheetview to the location of a given difference.

 src/dialogs/dialog-sheet-compare.c |   69 ++++++++++++++++++++++++++++++++++++
 1 files changed, 69 insertions(+), 0 deletions(-)
---
diff --git a/src/dialogs/dialog-sheet-compare.c b/src/dialogs/dialog-sheet-compare.c
index 631adc3..ae073ce 100644
--- a/src/dialogs/dialog-sheet-compare.c
+++ b/src/dialogs/dialog-sheet-compare.c
@@ -28,11 +28,14 @@
 #include <wbc-gtk.h>
 #include <workbook-view.h>
 #include <workbook.h>
+#include <workbook-priv.h>
 #include <sheet.h>
 #include <ranges.h>
 #include <cell.h>
 #include <sheet-style.h>
 #include <application.h>
+#include <selection.h>
+#include <sheet-view.h>
 #include <widgets/gnm-sheet-sel.h>
 #include <widgets/gnm-workbook-sel.h>
 
@@ -761,6 +764,71 @@ cb_compare_clicked (G_GNUC_UNUSED GtkWidget *ignore,
        gtk_notebook_set_current_page (GTK_NOTEBOOK (state->notebook), 1);
 }
 
+static SheetView *
+find_and_focus (GnmRangeRef const *loc, SheetView *avoid)
+{
+       Workbook *wb;
+       GnmRange r;
+       Sheet *loc_sheet;
+
+       if (!loc)
+               return NULL;
+       extract_range (loc, &r, &loc_sheet);
+       wb = loc_sheet->workbook;
+
+       WORKBOOK_FOREACH_VIEW(wb, view, {
+               SheetView *sv;
+               int col = r.start.col;
+               int row = r.start.row;
+
+               sv = wb_view_cur_sheet_view (view);
+
+               if (sv == avoid)
+                       continue;
+               if (wb_view_cur_sheet (view) != loc_sheet)
+                       continue;
+
+               sv_set_edit_pos (sv, &r.start);
+               sv_selection_set (sv, &r.start, col, row, col, row);
+               sv_make_cell_visible (sv, col, row, FALSE);
+               sv_update (sv);
+               return sv;
+               });
+       return NULL;
+}
+
+static void
+cb_cursor_changed (GtkTreeView *tree_view, SheetCompare *state)
+{
+       GtkTreePath *path;
+       gboolean ok;
+       GnmRangeRef *loc_old = NULL;
+       GnmRangeRef *loc_new = NULL;
+       GtkTreeModel *model = gtk_tree_view_get_model (tree_view);
+       SheetView *sv;
+       GtkTreeIter iter;
+
+       gtk_tree_view_get_cursor (tree_view, &path, NULL);
+       if (!path)
+               return;
+
+       ok = gtk_tree_model_get_iter (model, &iter, path);
+       gtk_tree_path_free (path);
+       if (!ok)
+               return;
+
+       gtk_tree_model_get (model, &iter,
+                           ITEM_OLD_LOC, &loc_new,
+                           ITEM_NEW_LOC, &loc_old,
+                           -1);
+
+       sv = find_and_focus (loc_old, NULL);
+       (void)find_and_focus (loc_new, sv);
+
+       g_free (loc_old);
+       g_free (loc_new);
+}
+
 /* ------------------------------------------------------------------------- */
 
 void
@@ -822,6 +890,7 @@ dialog_sheet_compare (WBCGtk *wbcg)
 #define CONNECT(o,s,c) g_signal_connect(G_OBJECT(o),s,G_CALLBACK(c),state)
        CONNECT (state->cancel_btn, "clicked", cb_cancel_clicked);
        CONNECT (state->compare_btn, "clicked", cb_compare_clicked);
+       CONNECT (state->results_view, "cursor-changed", cb_cursor_changed);
 #undef CONNECT
 
        /* a candidate for merging into attach guru */