Re: Add Gtk::TextView to Gtk::Grid

[Bill Greene <w h greene gmail com>]

Many thanks! It seems that the following call was the key to my problem:

m_TextView.set_expand();

This call seems very non-intuitive to me; I would have expected the TextView to automatically expand

based on the contents of the TextBuffer.

Or, to ask the question another way: Why does the TextView display correctly when it is added as a 

child of the window but not when it is placed in a Grid?

On Thu, Oct 6, 2022 at 9:42 AM Kjell Ahlstedt <kjellahlstedt gmail com> wrote:

set_child(m_grid); shows that this is gtkmm4.

I made some tests with the TextView example in gtkmm-documentation,

https://gitlab.gnome.org/GNOME/gtkmm-documentation/-/tree/master/examples/book/textview

1. Replaced Gtk::Box m_VBox; by Gtk::Grid m_grid; The TextView is a child of a ScrolledWindow, which is a child of the Grid, which is the child of the window.
The text in the TextView was shown.

2. Removed the ScrolledWindow.
The TextView was not shown. Or, rather, it was minimized.

3. Added m_TextView.set_expand();
The TextView was shown again.

Den 2022-10-06 kl. 13:00, skrev Rodolfo Ribeiro Gomes:

If you are gtkmm3, widgets are hidden by default.

You should call Gtk::Container::show_all_children() or Gtk::Widget::show_all().

AFAIK, in gtkmm4 this isn't necessary anymore, as widgets are (finally) visible by default.

Em qui., 6 de out. de 2022 às 07:33, Bill Greene via gtkmm-list <gtkmm-list gnome org> escreveu:

Thanks for taking a look at this.

Unfortunately, even after I make the TextView   a class member, I still don't see the text displayed in the window.

A concise description of the problem is this: 

If I make the TextView a child of the window, the text is displayed. If I make the TextView a child of a Grid, and the

Grid a child of the window, the text is not displayed.

I am assuming there might be some property of the Grid I need to set?

On Wed, Oct 5, 2022 at 12:40 PM Kjell Ahlstedt <kjellahlstedt gmail com> wrote:

You have declared the TextView  as a local variable in the constructor.
It will be deleted when the constructor finishes. You must either
declared it in your window class, like the buttons in

https://gitlab.gnome.org/GNOME/gtkmm-documentation/-/blob/master/examples/book/grid/examplewindow.h

or create it with Gtk::make_managed() in the constructor, like the button in

https://gitlab.gnome.org/GNOME/gtkmm-documentation/-/blob/master/examples/book/scrolledwindow/examplewindow.cc

Den 2022-10-05 kl. 17:00, skrev Bill Greene via gtkmm-list:
> I am trying to add a TextView instance to a Grid. But when I display
> the window, it is
> empty. The Grid examples I have seen add buttons to the grid and these
> work fine
> for me. But I don't understand the difference between adding a button
> and adding
> a TextView. If anyone can help me with this, I would appreciate it.
>
> Here is my sample code (part of the constructor for my window):
>
>   set_child(m_grid);
>   Gtk::TextView tc;
>   Glib::RefPtr<Gtk::TextBuffer> tb = Gtk::TextBuffer::create();
>   std::string msg("cell 1,1");
>   auto it = tb->insert(tb->begin(), msg);
>   tc.set_buffer(tb);
>   m_grid.attach(tc, 0, 0);
>   m_grid.set_visible();
>