Re: [paragui-users] Listbox select and add

[Eric Ross]

On Wed, 7 Aug 2002, Andrew Ford wrote:

> Thanks Craig,
>     I'll take a look when I get a chance.  Eric,
> perhaps you would like to try it?
> 
> > Andrew,
> >     Here is the code that works if there are no
> > items in the listbox selected. When an item is
> > selected and access violation occurs. This happens
> > when the function is exited, and the return value
> > set true/false doesn't fix it. The variable b tries
> > to get the item that is selected and unselect it.
> > This doesn't work.

I've doing some tests, but i didnt find any problems.

Craig: can you test the following program, and tell us if you find any 
problem ?

--------------->8-----------------------
#include "paragui.h"
#include "pgapplication.h"
#include "pglistbox.h"
#include "pglistboxitem.h"

PARAGUI_CALLBACK(handle_click) {
        static int counter = 1;
        PG_ListBox* l = reinterpret_cast<PG_ListBox*>(clientdata);

        char text[20];
        sprintf(text,"nuevo %i", counter++);
        l->AddItem(new PG_ListBoxItem(25, text));
        l->Update();
        return true;
}

int main( int argc, char **argv )
{
        PG_Application app;
        
        app.LoadTheme( "default" );
        
        app.InitScreen( 640, 480, 0 );
        app.SetEmergencyQuit(true);
        
        PG_ListBox listbox(NULL, PG_Rect(10,10,300,400));
        
        listbox.AddItem(new PG_ListBoxItem(25, "Item1"));
        listbox.AddItem(new PG_ListBoxItem(25, "Item2"));
        listbox.AddItem(new PG_ListBoxItem(25, "Item3"));
        listbox.AddItem(new PG_ListBoxItem(25, "Item4"));
        listbox.AddItem(new PG_ListBoxItem(25, "Item5"));
        listbox.AddItem(new PG_ListBoxItem(25, "Item6"));
        listbox.AddItem(new PG_ListBoxItem(25, "Item7"));
        listbox.AddItem(new PG_ListBoxItem(25, "Item8"));
        listbox.AddItem(new PG_ListBoxItem(25, "Item9"));
        listbox.AddItem(new PG_ListBoxItem(25, "Item10"));
        listbox.Show();
        
        PG_Button b(NULL, 101, PG_Rect(400,10,110,30), "TEST");
        b.SetEventCallback(MSG_BUTTONCLICK, handle_click, &listbox);
        b.Show();

        app.Run();
        
        return 0;
}
--------------------8<-------------------

This thing is very simple: just a listbox and a button. Press the button 
to add a new item to the listbox. 

Good luck.


--