Initial revision

git-svn-id: svn://localhost/trunk/ardour2@4 d708f5d6-7413-0410-9779-e7cbd77b26cf

libs/glibmm2/glibmm/propertyproxy_base.cc

@@ -0,0 +1,151 @@
+// -*- c++ -*-
+/* $Id$ */
+
+/* propertyproxy_base.h
+ *
+ * Copyright 2002 The gtkmm Development Team
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Library General Public
+ * License as published by the Free Software Foundation; either
+ * version 2 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Library General Public License for more details.
+ *
+ * You should have received a copy of the GNU Library General Public
+ * License along with this library; if not, write to the Free
+ * Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ */
+
+#include <glibmm/propertyproxy_base.h>
+#include <glibmm/signalproxy_connectionnode.h>
+#include <glibmm/object.h>
+#include <glibmm/private/object_p.h>
+
+namespace Glib
+{
+
+/** PropertyProxyConnectionNode is a connection node for use with SignalProxyProperty.
+  * It's like ProxyConnectionNode, but it contains the property name too.
+  */
+class PropertyProxyConnectionNode : public SignalProxyConnectionNode
+{
+public:
+  friend class SignalProxyProperty;
+
+  PropertyProxyConnectionNode(const sigc::slot_base& slot, GObject* gobject, const gchar* property_name);
+
+protected:
+  //This will be examined in the callback.
+  //Should be a static string literal.
+  const gchar* property_name_;
+};
+
+PropertyProxyConnectionNode::PropertyProxyConnectionNode(const sigc::slot_base& slot, GObject* gobject, const gchar* property_name)
+: SignalProxyConnectionNode(slot, gobject),
+  property_name_(property_name)
+{
+}
+
+//SignalProxyProperty implementation:
+
+SignalProxyProperty::SignalProxyProperty(Glib::ObjectBase* obj, const gchar* property_name)
+: SignalProxyBase(obj),
+  property_name_(property_name)
+{
+}
+
+SignalProxyProperty::~SignalProxyProperty()
+{
+}
+
+sigc::connection SignalProxyProperty::connect(const SlotType& sl)
+{
+  // create a proxy to hold our connection info
+  PropertyProxyConnectionNode* pConnectionNode = new PropertyProxyConnectionNode(sl, obj_->gobj(), property_name_ );
+
+  // connect it to gtk+
+  // pConnectionNode will be passed as the data argument to the callback.
+  // The callback will then call the virtual Object::property_change_notify() method,
+  // which will contain a switch/case statement which will examine the property name.
+  pConnectionNode->connection_id_ = g_signal_connect_data(obj_->gobj(),
+         "notify", (GCallback)(&callback), pConnectionNode,
+         &PropertyProxyConnectionNode::destroy_notify_handler,
+         G_CONNECT_AFTER);
+
+  return sigc::connection(pConnectionNode->slot_);
+}
+
+void SignalProxyProperty::callback(GObject*, GParamSpec* pspec, gpointer data) //static
+{
+  if(pspec && data)
+  {
+    //Get the name of the property that has changed:
+    const char* property_name_changed = pspec->name;
+
+    //Get the name of the property that we are waiting for:
+    PropertyProxyConnectionNode* conn = static_cast<PropertyProxyConnectionNode*>(data);
+    const char* property_name_monitored = conn->property_name_;
+
+    //If it's the correct property, then call the signal handler:
+    if(strcmp(property_name_changed, property_name_monitored) == 0)
+    {
+      if(sigc::slot_base *const slot = data_to_slot(data))
+        (*static_cast<sigc::slot<void>*>(slot))();
+    }
+  }
+}
+
+
+//PropertyProxy_Base implementation:
+
+PropertyProxy_Base::PropertyProxy_Base(ObjectBase* obj, const char* property_name)
+:
+  obj_           (obj),
+  property_name_ (property_name)
+{}
+
+PropertyProxy_Base::PropertyProxy_Base(const PropertyProxy_Base& other)
+:
+  obj_           (other.obj_),
+  property_name_ (other.property_name_)
+{}
+
+SignalProxyProperty PropertyProxy_Base::signal_changed()
+{
+  return SignalProxyProperty(obj_, property_name_);
+}
+
+void PropertyProxy_Base::set_property_(const Glib::ValueBase& value)
+{
+  g_object_set_property(obj_->gobj(), property_name_, value.gobj());
+}
+
+void PropertyProxy_Base::get_property_(Glib::ValueBase& value) const
+{
+  g_object_get_property(obj_->gobj(), property_name_, value.gobj());
+}
+
+void PropertyProxy_Base::reset_property_()
+{
+  // Get information about the parameter:
+  const GParamSpec *const pParamSpec =
+      g_object_class_find_property(G_OBJECT_GET_CLASS(obj_->gobj()), property_name_);
+
+  g_return_if_fail(pParamSpec != 0);
+
+  Glib::ValueBase value;
+  value.init(G_PARAM_SPEC_VALUE_TYPE(pParamSpec));
+
+  // An explicit reset is not needed, because ValueBase:init()
+  // has already initialized it to the default value for this type.
+  // value.reset();
+
+  g_object_set_property(obj_->gobj(), property_name_, value.gobj());
+}
+
+} // namespace Glib
+