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DFL multiple selection ListBox question

 
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Portis



Joined: 26 Sep 2005
Posts: 6
PostPosted: Mon Sep 26, 2005 9:03 pm    Post subject: DFL multiple selection ListBox question Reply with quote
Hi,

I've been using DFL for a little while now, I even managed to build a system-tray client for a Java server Smile, and it works really well.

However I've come across a weird problem I just can't figure out, either by experimenting, looking at existing code or web searching.

I have a need to present a list of items and have the user choose a number of them, I then do some ODBC'ing to SQL Server (which I've got working) depending on what's selected.
The trouble is, I can't seem to get the 'multple selection' thing behaving.

(Apologies for the length of the sample code, I can't reduce it too much more without it becoming more confusing)

Code:

import std.string;

import dfl.all;

class LBTestForm: Form
{
   ListBox the_list;
   Button the_button;
   Font the_font;
   
   this()
   {
      startPosition = FormStartPosition.CENTER_SCREEN;
      formBorderStyle = FormBorderStyle.FIXED_DIALOG;
      width =250;
      height = 200;
            
      maximizeBox = false;
      text = "ListBox Test";
      the_font = new Font("Arial", 12);
      
      with (the_list = new ListBox)
      {
         bounds = Rect(10, 10, 200, 100);
         selectionMode = SelectionMode.MULTI_SIMPLE;
         font = the_font;
         parent = this;
         items.add("First thing in the list");
         items.add("then there's this one");
         items.add("oh, and one more");
         items.add("last one, I promise");
      }
      
      with (the_button = new Button)
      {
         bounds = Rect(10, the_list.bottom + 10, 90, 30);
         text = "List Info";
         font = the_font;
         parent = this;
         click ~= &button_click;
      }
      
   }
   
   private void button_click(Object sender, EventArgs ea)
   {
      int num_possible = the_list.items.count;
      msgBox("Number of items\nin the list: " ~ std.string.toString(num_possible));
      
      int num_selected = the_list.selectedItems.count;
      msgBox("Number of items\nselected: " ~ std.string.toString(num_selected));
   }
   
}

int main(char[][] args)
{
   Application.run(new LBTestForm);
   return (0);
}



I suspect I'm doing something wrong in terms of the 'selectedItems' property.

You'll see one message box pop up saying there are 4 items in the list, which is correct, then I get a 'Stack Overflow' message.
Whenever I try to access the 'selectedItems' or 'selectedIndicies' properites, it falls over.

I've had a look in the 'listview.d' example and both the 'listview.d' and 'listbox.d' DFL source files, and I think 'selectedItems' is the correct thing to use but it's hard to tell.

I'm using the Sept 10 snapshot, with a rebuilt 'dfl.lib' without the '-debug' flags, with DMD 0.131.
Just in case that was adding to the error, I rebuilt both the DFL library and my listbox tester with -'debug', but no joy.

Can anyone see what I'm doing wrong in regard to getting multiple selections from a ListBox control?

Thanks in advance.
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Chris Miller



Joined: 27 Mar 2004
Posts: 514
Location: The Internet
PostPosted: Tue Sep 27, 2005 7:14 am    Post subject: Reply with quote
It was a bug in DFL's ListBox.selectedItems.count, fixed in snapshot 20050927. Thanks for letting me know about it.
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Portis



Joined: 26 Sep 2005
Posts: 6
PostPosted: Tue Sep 27, 2005 12:59 pm    Post subject: Reply with quote
Thanks for sorting out the fix so quickly.

I've just rebuild the test case and it works just fine. Smile

I'm now able to use 'selectedItems' and iterate through the choices selected in a multi-selction ListBox.
Code:

if (the_list.selectedItems.count > 0)
{
   char[] selected_msg = "You selected:\n";
   foreach (char[] selected_item; the_list.selectedItems)
      selected_msg ~= "* '" ~ selected_item ~ "'\n";
   msgBox(selected_msg);
}

Thank you.
Very Happy
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