[Qt-interest] Gtk+ and Qt migration/integration

[Vadim Godunko]

Vadim Godunko wrote:
> 
> I have a lot of Gtk+ code and want to migrate to Qt. Is it possible to
> use Gtk+ code inside Qt application?

Thanks all for help! It seems possible to use Gtk+ and Qt in the same
application only on X11 platforms. Here is my test program. It creates
combination of the Gtk+/Qt main window and push button depending from
values of the MAINWINDOW_IS_QT and EMBEDDED_IS_QT macros. Unfortunately,
Qt's main window seems unable to embed Gtk+'s push button.


#include <gtk/gtk.h>

#include <QApplication>
#include <QMainWindow>
#include <QPushButton>
#include <QX11EmbedContainer>
#include <QX11EmbedWidget>

#define MAINWINDOW_IS_QT true
#define EMBEDDED_IS_QT true

void create_qt_embed(long id)
{
    QX11EmbedWidget* plug = new QX11EmbedWidget;
    plug->embedInto(id);

    QPushButton* button = new QPushButton("My Label", plug);

    plug->show();
}

void create_gtk_plug(long id)
{
    GtkWidget* plug = gtk_plug_new(id);
    gtk_widget_show(plug);

    GtkWidget* button = gtk_button_new_with_label("My Label");
    gtk_widget_show(button);
    gtk_container_add(GTK_CONTAINER(plug), button);
}

int main(int argc, char* argv[])
{
    gtk_init(&argc, &argv);
    QApplication app(argc, argv);

    if (MAINWINDOW_IS_QT)
    {
        QMainWindow* main_window = new QMainWindow;
        QX11EmbedContainer* container = new QX11EmbedContainer;
        main_window->setCentralWidget(container);

        if (EMBEDDED_IS_QT)
        {
            create_qt_embed(container->winId());
        } else
        {
            create_gtk_plug(container->winId());
        }

        main_window->show();

        QApplication::exec();

    } else
    {
        GtkWidget *window = gtk_window_new(GTK_WINDOW_TOPLEVEL);
        g_signal_connect(G_OBJECT(window), "destroy",
                         G_CALLBACK(gtk_main_quit), NULL);
        gtk_widget_show(window);

        GtkWidget* container = gtk_socket_new();
        gtk_widget_show(container);
        gtk_container_add(GTK_CONTAINER(window), container);

        if (EMBEDDED_IS_QT)
        {
            create_qt_embed(gtk_socket_get_id(GTK_SOCKET(container)));
        } else
        {
            create_gtk_plug(gtk_socket_get_id(GTK_SOCKET(container)));
        }

        gtk_main();
    }

    return 0;
}