Re: ScrolledWindow::remove() problem

[Cedric Gustin <cedric gustin gmail com>]

Hi Sebastian,

What about calling show_all_children() after you have added the widget
to the scrollwindow (instead of in the layout constructor where the
layout hasn't been fully initialized yet) ?

Works fine on my winxp box with gtkmm 2.8.

Cedric

Sebastián E.Peyrott wrote:
> Of course, here's a little app that crashes under Windows but seems to run OK 
> in Linux. You'll need to click the button twice, since the ScrolledWindow is 
> empty the first time. #define EXAMPLE_STANDARD_WIDGETS if you want to use 
> standard widgets instead of the derived class, in which case the app should run 
> without problems even under Windows.
> These are the tested configurations:
> Linux (GCC-4.1.1):
> - Build: Gtk-2.8.19/Gtkmm-2.8.3 - Runtime: Gtk-2.8.19/Gtkmm-2.8.3 -> OK!
> Windows (XP, Mingw32-GCC-4.1.1 and Mingw32-GCC-3.4.6):
> - Build: Gtk/Gtkmm-2.6 - Runtime: Gtk/Gtkmm-2.8 -> Crashes with derived widget.
> - Build: Gtk/Gtkmm-2.8 - Runtime: Gtk/Gtkmm-2.8 -> Crashes with derived widget.
> 
> I should mention the Windows libraries (build + runtime) are the binaries 
> provided by Cedric Gustin.
> -------------------------------------------------------------------------------
> 
> #include <gtkmm/window.h>
> #include <gtkmm/scrolledwindow.h>
> #include <gtkmm/layout.h>
> #include <gtkmm/button.h>
> #include <gtkmm/main.h>
> #include <gtkmm/box.h>
> #include <gtkmm/tooltips.h>
> #include <gtkmm/label.h>
> 
> /* Define me to use standard widgets. */
> /* Undefine me to use the derived class below. */
> //#define EXAMPLE_STANDARD_WIDGETS
> 
> /* This is the evil class! */
> class c_DerivedLayout : public Gtk::Layout
> {
> public:
>    //We do nothing.
>    c_DerivedLayout()
>    {
>       /* Comment me out, if you think I'm guilty =) */
>       put(*Gtk::manage(new Gtk::Label("Hello")), 5, 5);
>       show_all_children();
>       /* ------------------------------------------ */
>    }
> };
> 
> class c_Window : public Gtk::Window
> {
> public:
>    c_Window()
>    {
>       set_default_size(400, 400);
>       add(m_vboxBox);
>       m_vboxBox.pack_start(m_scrollwScroll);
>       m_vboxBox.pack_end(m_butButton);
>       m_butButton.set_label("Click Me Twice! =)");
>       l_auxTip.set_tip(m_butButton, "Whenever you click me, I'll remove the 
> contained "
>                                     "widget from the ScrolledWindow above me, 
> and then "
>                                     "add a new widget. The first time you do 
> so, there'll "
>                                     "be no contained widget, so everything 
> should work as expected. "
>                                     "Click me again, and, if we are in Windows, 
> I'll die.");
>       m_butButton.signal_clicked().connect(sigc::mem_fun(*this, 
> &c_Window::on_m_butButton_clicked));
>       
>       show_all_children();
>    }
>    
> private:   
>    void on_m_butButton_clicked()
>    {
>       /* If there is no widget inside the ScrolledWindow,
>          or, if the contained widget is a standard widget,
>          everything works as expected.*/
>       m_scrollwScroll.remove();
>       /* We work with unmanaged widgets, so in this case
>          we have a leak (this is obviously avoided in the
>          original project).*/
> #ifdef EXAMPLE_STANDARD_WIDGETS
>       m_scrollwScroll.add(*new Gtk::Layout);
> #else
>       m_scrollwScroll.add(*new c_DerivedLayout);
> #endif
>    }
>    
>    Gtk::Tooltips l_auxTip;
>    Gtk::VBox m_vboxBox;
>    Gtk::ScrolledWindow m_scrollwScroll;
>    Gtk::Button m_butButton;
> };
> 
> int main(int argc, char** argv)
> {
>    Gtk::Main l_Main(argc, argv);
>    c_Window l_Window;
>    l_Main.run(l_Window);
>    return 0;
> }
> 
> 
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