I Am trying to generate (in PERL) a subroutine that prompts a user to select from a list of people. The list has both names and photos.

I've got most of this working using GTK3 Liststore/Treeview code. However, I cannot seem to figure out how to get the window to automatically follow the cursor. If the user moves the cursor past the bottom (or top) of the displayed window using up/down keys, they must manually adjust the scrollbar to see it.

Can some kind soul suggest the magic needed to do this? Suggestions on a better way to accomplish this task are also appreciated.

Richard Rosa

 

sub get_person_dialog {
   
   
   
   ###################################################### 
   # Create a Liststore so that pictures can be used.   #
   # Column 0 of the liststore is the person's full name#
   # Column 1 of the liststore is the person's dbid     #
   # Column 2 of the liststore is the person's picture  #
   ######################################################
   my $col_name = 0;
   my $col_id = 1;
   my $col_picture = 2;              
   my $liststore = Gtk3::ListStore->new ('Glib::String',
   'Glib::String','Gtk3::Gdk::Pixbuf');
   
   #### List of all DBindexes for every person in the database
   my @people_keys  = sort_by_name(); ### Custom sorting routine
    
   foreach my $key (@people_keys) {
      my $iter = $liststore->append; 
      $liststore->set ($iter, $col_last,FALSE);    ### toggle 
      $liststore->set ($iter, $col_name, "$dbase{$key}{'name'}");
      $liststore->set ($iter, $col_id, "$key");

      ### Is there a picture for this person?
      my $picture = $dbase{$key}{'picture'};
      if ($picture) {
         my $pixbuf = Gtk3::Gdk::Pixbuf->new_from_file_at_size(
        "$picture",100,100);
         $liststore->set($iter,$col_picture,$pixbuf); 
      }
   } 
   
   
   my $treeview = Gtk3::TreeView->new ($liststore); 
   $treeview->set_enable_search(TRUE);   ### allow for search
   $treeview->set_headers_visible(FALSE); 
   $treeview->set_search_column($col_name);
   $treeview->set_hover_selection(FALSE); 
     
   
   ### Column and Cell renderer for the person's Full Name
   my $renderer = Gtk3::CellRendererText->new;
   $renderer ->set(editable => FALSE);
   my $treecol =  Gtk3::TreeViewColumn->new_with_attributes('name',
     $renderer,'text' => $col_name);
   $treeview->append_column($treecol);

   ### Column and Cell renderer for the person's ID
   $renderer = Gtk3::CellRendererText->new;
   $renderer ->set(editable => FALSE);
   $treecol =  Gtk3::TreeViewColumn->new_with_attributes(
    'id',$renderer,'text' => $col_id);
   $treeview->append_column($treecol);

   ### Column and Cell renderer for the persons Photo
   $renderer = Gtk3::CellRendererPixbuf->new;
   $treecol =  Gtk3::TreeViewColumn->new_with_attributes(
    'picture',$renderer,'pixbuf' => $col_picture);
   $treeview->append_column($treecol);
  
   
   ### put this in a scrolled window
   my $tvsb =  Gtk3::ScrolledWindow->new;
   $tvsb->add_with_viewport($treeview);
   $tvsb->set_min_content_height(400); 
   $tvsb->set_min_content_width(900);
   $tvsb->set_policy('GTK_POLICY_ALWAYS',
      'GTK_POLICY_ALWAYS'); 

  
   ### Build a dialog to show this selection
   my $dl = Gtk3::MessageDialog->new(
      $main_window,  ### parent
      [qw/modal destroy-with-parent/], ### flags
      'GTK_MESSAGE_QUESTION',
      'GTK_BUTTONS_NONE',
      "Please select the person to edit");
   
  
   $dl->get_content_area()->add($tvsb); 
   
   ### add an ICON for the Dialog
   my $stock = Gtk3::Image->new_from_icon_name(
    $stock_icons[3],'GTK_ICON_SIZE_DIALOG');
   $dl->set_image($stock);
   ### Add some buttons
   $dl->add_button('gtk-ok','ok');
   $dl->add_button('gtk-cancel','cancel');
    
   
   $dl->show_all;
   my $response = $dl->run;

   ### Get selected item
   my $value = 0;
   my $selection = $treeview->get_selection(); 
   if ($selection) {
      my ($md,$iter) = $selection->get_selected();
      if ($iter) {
         $value = $liststore->get($iter,$col_id);
         if (!$value) {$value = 0;}
      }
   }
  

   
   $dl->destroy;
   if ($response eq 'cancel') {return 0;} 
     
   return $value;  ## Person's ID will be returned
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