From 57045df5fe3ec557e57dc7434ac1a07b5521bffc Mon Sep 17 00:00:00 2001
From: Guenter  Geiger <ggeiger@users.sourceforge.net>
Date: Mon, 29 Jul 2002 17:06:19 +0000
Subject: This commit was generated by cvs2svn to compensate for changes in
 r58, which included commits to RCS files with non-trunk default branches.

svn path=/trunk/; revision=59
---
 pd/src/g_guiconnect.c | 94 +++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 94 insertions(+)
 create mode 100644 pd/src/g_guiconnect.c

(limited to 'pd/src/g_guiconnect.c')

diff --git a/pd/src/g_guiconnect.c b/pd/src/g_guiconnect.c
new file mode 100644
index 00000000..aef8acb6
--- /dev/null
+++ b/pd/src/g_guiconnect.c
@@ -0,0 +1,94 @@
+/* Copyright (c) 1997-2000 Miller Puckette.
+* For information on usage and redistribution, and for a DISCLAIMER OF ALL
+* WARRANTIES, see the file, "LICENSE.txt," in this distribution.  */
+
+/*  a thing to forward messages from the GUI, dealing with race conditions
+in which the "target" gets deleted while the GUI is sending it something.
+*/
+
+#include "m_pd.h"
+#include "g_canvas.h"
+
+struct _guiconnect
+{
+    t_object x_obj;
+    t_pd *x_who;
+    t_symbol *x_sym;
+    t_clock *x_clock;
+};
+
+static t_class *guiconnect_class;
+
+t_guiconnect *guiconnect_new(t_pd *who, t_symbol *sym)
+{
+    t_guiconnect *x = (t_guiconnect *)pd_new(guiconnect_class);
+    x->x_who = who;
+    x->x_sym = sym;
+    pd_bind(&x->x_obj.ob_pd, sym);
+    return (x);
+}
+
+    /* cleanup routine; delete any resources we have */
+static void guiconnect_free(t_guiconnect *x)
+{
+    if (x->x_sym)
+    	pd_unbind(&x->x_obj.ob_pd, x->x_sym);
+    if (x->x_clock)
+    	clock_free(x->x_clock);	
+}
+
+    /* this is called when the clock times out to indicate the GUI should
+    be gone by now. */
+static void guiconnect_tick(t_guiconnect *x)
+{
+    pd_free(&x->x_obj.ob_pd);
+}
+
+    /* the target calls this to disconnect.  If the gui has "signed off"
+    we're ready to delete the object; otherwise we wait either for signoff
+    or for a timeout. */
+void guiconnect_notarget(t_guiconnect *x, double timedelay)
+{
+    if (!x->x_sym)
+    	pd_free(&x->x_obj.ob_pd);
+    else
+    {
+    	x->x_who = 0;
+	if (timedelay > 0)
+	{
+	    x->x_clock = clock_new(x, (t_method)guiconnect_tick);
+	    clock_delay(x->x_clock, timedelay);
+	}
+    }    
+}
+
+    /* the GUI calls this to send messages to the target. */
+static void guiconnect_anything(t_guiconnect *x,
+    t_symbol *s, int ac, t_atom *av)
+{
+    if (x->x_who)
+    	typedmess(x->x_who, s, ac, av);
+}
+
+    /* the GUI calls this when it disappears.  (If there's any chance the
+    GUI will fail to do this, the "target", when it signs off, should specify
+    a timeout after which the guiconnect will disappear.) */
+static void guiconnect_signoff(t_guiconnect *x)
+{
+    if (!x->x_who)
+    	pd_free(&x->x_obj.ob_pd);
+    else
+    {
+    	pd_unbind(&x->x_obj.ob_pd, x->x_sym);
+	x->x_sym = 0;
+    }
+}
+
+void g_guiconnect_setup(void)
+{
+    guiconnect_class = class_new(gensym("guiconnect"), 0,
+    	(t_method)guiconnect_free, sizeof(t_guiconnect), CLASS_PD, 0);
+    class_addanything(guiconnect_class, guiconnect_anything);
+    class_addmethod(guiconnect_class, (t_method)guiconnect_signoff,
+    	gensym("signoff"), 0);
+}
-- 
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