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GTK+ 2 Reference Manual wrote:By default, windows have a close button in the window frame. Some window managers allow GTK+ to disable this button. If you set the deletable property to FALSE using this function, GTK+ will do its best to convince the window manager not to show a close button. Depending on the system, this function may not have any effect when called on a window that is already visible, so you should call it before calling gtk_window_show().

CompilerIf #PB_Compiler_OS = #PB_OS_Linux
  Import ""
    gtk_window_set_deletable(*Window.GtkWindow, Setting.I)
  EndImport
CompilerEndIf

If OpenWindow(0, 0, 0, 320, 240, "Window 1", #PB_Window_ScreenCentered|#PB_Window_SystemMenu)
  If OpenWindow(1, 0, 0, 240, 120, "Window 2", #PB_Window_Tool|#PB_Window_WindowCentered,WindowID(0))
    DisableWindow(0,1)

    CompilerIf #PB_Compiler_OS = #PB_OS_Linux
      gtk_window_set_deletable(WindowID(1), #False)
      gtk_widget_show_(WindowID(1))
    CompilerEndIf

    SetActiveWindow(1)
    ButtonGadget(0, 60, 40, 120, 25, "Close Window 2")
  EndIf
  Repeat
    Event = WaitWindowEvent()
    Select Event
      Case #PB_Event_Gadget
        Select EventGadget()
          Case 0 : CloseWindow(1) : DisableWindow(0,0) : SetActiveWindow(0)
        EndSelect
    EndSelect
  Until Event = #PB_Event_CloseWindow
EndIf

End

Shardik wrote:It depends on the Window Manager of your Linux distribution whether it is possible to remove the close button from a window's title bar with gtk_window_set_deletable():

GTK+ 2 Reference Manual wrote:By default, windows have a close button in the window frame. Some window managers allow GTK+ to disable this button. If you set the deletable property to FALSE using this function, GTK+ will do its best to convince the window manager not to show a close button. Depending on the system, this function may not have any effect when called on a window that is already visible, so you should call it before calling gtk_window_show().

I have tested your modified 1st example below successfully with these Linux distributions (no close button in Window 2):
- ElementaryOS 0.2 x86 with Pantheon
- Fedora 20 x86 with Gnome 3
- Kubuntu 10.04 x86 with KDE
- Kubuntu 14.04 x86 with KDE
- Linux Mint 17 x86 with Cinnamon
- OpenSuse 11.1 x86 with KDE (reported by Vera)
- PearOS 8 x86 with heavily modified Gnome 3
- Xubuntu 14.04 x86 with Xfce (a "+" button is displayed instead of an "x" button in Window 2 but it doesn't close Window 2!)

bubba@ubuntu-vb:~$ echo $DESKTOP_SESSION
ubuntu-2d
bubba@ubuntu-vb:~$ echo $XDG_CURRENT_DESKTOP
Unity

bubba@ubuntu-vb:~$ echo $DESKTOP_SESSION
gnome-classic
bubba@ubuntu-vb:~$ echo $XDG_CURRENT_DESKTOP
GNOME

It doesn't work on these distributions (Close button is still displayed and operational):
- Ubuntu 10.04 x86 with Gnome 2
- Ubuntu 14.04 x86 with Unity

bbanelli wrote:It works for me on:
- Ubuntu 12.04 LTS x86 Unity
- Ubuntu 12.04 LTS x86 Gnome
- Ubuntu 12.04 LTS x64 Unity
- Ubuntu 12.04 LTS x64 Gnome

bbanelli wrote:Which makes me wonder...

Code: Select all

It doesn't work on these distributions (Close button is still displayed and operational):
- Ubuntu 10.04 x86 with Gnome 2
- Ubuntu 14.04 x86 with Unity

Why isn't it working on these two for you?

Shardik wrote:I have also done some tests on Ubuntu 12.04 x86 and it seems to depend on the type of window manager with which you sign on. On my Ubuntu 12.04 x86 installation I have the choice between 4 window managers to use for sign on and it seems that those with 3D features don't allow to remove the close button:
[-] Ubuntu
[+] Ubuntu 2D
[-] GNOME Classic
[+] GNOME Classic (No effects)

In the tests of my previous posting I always used the default window manager for sign on. So for Ubuntu I always used Unity (with 3D features) whereas you used the 2D version...