Re: Get size of widget

[Kjell Ahlstedt <kjellahlstedt gmail com>]

I modified your example, adding on_button_realize(). The output becomes

1 1
1 1
1 1
1 1
1 1
1 1
Button has been realized: 49 29
49 29

All your calls to GetSize() occur before the button is realized.

#include <iostream>
#include <gtkmm.h>
#include <gtkmm/window.h>

class ExampleWindow: public Gtk::Window
{
    Gtk::Button button;
    public:
    ExampleWindow(): button("Hallo")
    {
        add(button);
        GetSize();
        button.signal_realize().connect(sigc::mem_fun(*this, 
&ExampleWindow::on_button_realize));
    }

    void GetSize()
    {
        std::cout << button.get_width() << " " << button.get_height() 
<< std::endl;
        std::cout << button.get_allocated_width() << " " << 
button.get_allocated_height() << std::endl;
    }

    void on_button_realize()
    {
      std::cout << "Button has been realized: ";
      GetSize();
    }
};


int main(int argc, char* argv[])
{
    Gtk::Main kit(argc, argv);

    ExampleWindow window;

    window.GetSize();
    window.show_all_children();
    window.GetSize();
    Gtk::Main::run(window);
    return 0;
}

On 2017-12-26 14:59, Phil Wolff wrote:
> A widget's size is negotiated when it is realized. As in one of your 
> other questions, signal_realized() should help.