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