[linux-audio-dev] plugin GUIs

the following is tiny example to show that its possible to use XEMBED or just native X Window IDs to create host-managed plugin GUIs. GTK+2 and Qt3 both support XEMBED; GTK+2 supports use of native X Window ids when creating new top level windows, i am not sure about Qt (does anybody here know how to do it). this means that a GTK host can manage a Qt GUI or vice versa, without any toolkit specific hacks in the host or in a library linked by the host. i offer this as a proof of concept. i believe that our problems with GUIs for plugins are pretty much over, modulo defining some standards as per another recent from me. --p ---------------------------------------------------------------------- #include <stdio.h> #include <stdlib.h> #include <gtk/gtk.h> #include <gdk/gdkx.h> gboolean button_pressed (GtkWidget *widget, GdkEventButton *event, gpointer user_data) { fprintf (stderr, "host: button press at %g,%g\n", event->x, event->y); return TRUE; } gboolean delete_event (GtkWidget* widget, GdkEvent* event, gpointer user_data) { fprintf (stderr, "host: window delete event\n"); gtk_main_quit (); return TRUE; } gboolean plugin_button_pressed (GtkWidget *widget, GdkEventButton *event, gpointer user_data) { fprintf (stderr, "plug: button press at %g,%g\n", event->x, event->y); return TRUE; } gboolean plugin_delete_event (GtkWidget* widget, GdkEvent* event, gpointer user_data) { fprintf (stderr, "plug: window delete event\n"); gtk_main_quit (); return FALSE; } int plugin_main (GdkNativeWindow window_id) { GtkWidget* embedded_parent; GtkWidget* dummy_label; GdkWindow* foreign_window; int argc = 1; char **argv = (char **) malloc (sizeof (char*)); argv[0] = "plugin"; gtk_init (&argc, &argv); #ifdef USE_XEMBED embedded_parent = gtk_plug_new (window_id); #else embedded_parent = gtk_window_new (GTK_WINDOW_TOPLEVEL); foreign_window = gdk_window_foreign_new (window_id); gtk_widget_set_parent_window (embedded_parent, foreign_window); #endif dummy_label = gtk_label_new ("This is a LADSPA Plugin GUI"); gtk_container_add (GTK_CONTAINER(embedded_parent), dummy_label); gtk_signal_connect (GTK_OBJECT(embedded_parent), "button-press-event", GTK_SIGNAL_FUNC (plugin_button_pressed), NULL); gtk_signal_connect (GTK_OBJECT(embedded_parent), "delete-event", GTK_SIGNAL_FUNC (plugin_delete_event), NULL); gtk_widget_add_events (GTK_WIDGET (embedded_parent), GDK_BUTTON_PRESS_MASK|GDK_BUTTON_RELEASE_MASK); gtk_widget_show (embedded_parent); gtk_widget_show (dummy_label); } int main (int argc, char *argv[]) { gtk_init (&argc, &argv); GtkWidget* embedded_parent; GtkWidget* embedded_window; embedded_window = gtk_window_new (GTK_WINDOW_TOPLEVEL); #ifdef USE_XEMBED embedded_parent = gtk_socket_new (); gtk_container_add (GTK_CONTAINER(embedded_window), embedded_parent); gtk_widget_show (embedded_parent); #endif gtk_signal_connect (GTK_OBJECT(embedded_window), "button-press-event", GTK_SIGNAL_FUNC (button_pressed), NULL); gtk_signal_connect (GTK_OBJECT(embedded_window), "delete-event", GTK_SIGNAL_FUNC (delete_event), NULL); gtk_widget_add_events (GTK_WIDGET (embedded_window), GDK_BUTTON_PRESS_MASK|GDK_BUTTON_RELEASE_MASK); gtk_widget_set_size_request (GTK_WIDGET(embedded_window), 100, 100); gtk_window_set_title (GTK_WINDOW(embedded_window), "A Plugin"); gtk_widget_show (embedded_window); gtk_widget_realize (embedded_window); #ifdef USE_XEMBED plugin_main (gtk_socket_get_id (GTK_SOCKET(embedded_parent))); #else plugin_main (GDK_WINDOW_XID (embedded_window->window)); #endif gtk_main (); }