1 files changed, 153 insertions, 0 deletions
diff --git a/sd/source/ui/tools/SlotStateListener.cxx b/sd/source/ui/tools/SlotStateListener.cxx
new file mode 100644
index 0000000000..9b75b322ee
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+++ b/sd/source/ui/tools/SlotStateListener.cxx
@@ -0,0 +1,153 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*
+ * This file is part of the LibreOffice project.
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * This file incorporates work covered by the following license notice:
+ *
+ *   Licensed to the Apache Software Foundation (ASF) under one or more
+ *   contributor license agreements. See the NOTICE file distributed
+ *   with this work for additional information regarding copyright
+ *   ownership. The ASF licenses this file to you under the Apache
+ *   License, Version 2.0 (the "License"); you may not use this file
+ *   except in compliance with the License. You may obtain a copy of
+ *   the License at http://www.apache.org/licenses/LICENSE-2.0 .
+ */
+
+#include <tools/SlotStateListener.hxx>
+#include <com/sun/star/frame/XDispatchProvider.hpp>
+#include <com/sun/star/frame/XDispatch.hpp>
+#include <com/sun/star/util/URLTransformer.hpp>
+#include <com/sun/star/util/XURLTransformer.hpp>
+
+#include <comphelper/processfactory.hxx>
+
+using namespace ::com::sun::star;
+
+namespace sd::tools {
+
+SlotStateListener::SlotStateListener (
+    Link<const OUString&,void> const & rCallback,
+    const uno::Reference<frame::XDispatchProvider>& rxDispatchProvider,
+    const OUString& rSlotName)
+    : mxDispatchProviderWeak(nullptr)
+{
+    SetCallback(rCallback);
+    ConnectToDispatchProvider(rxDispatchProvider);
+    ObserveSlot(rSlotName);
+}
+
+SlotStateListener::~SlotStateListener()
+{
+    ReleaseListeners();
+}
+
+void SlotStateListener::SetCallback (const Link<const OUString&,void>& rCallback)
+{
+    ThrowIfDisposed();
+
+    maCallback = rCallback;
+}
+
+void SlotStateListener::ConnectToDispatchProvider (
+    const uno::Reference<frame::XDispatchProvider>& rxDispatchProvider)
+{
+    ThrowIfDisposed();
+
+    // When we are listening to state changes of slots of another frame then
+    // release these listeners first.
+    if ( ! maRegisteredURLList.empty())
+        ReleaseListeners();
+
+    mxDispatchProviderWeak = rxDispatchProvider;
+}
+
+void SlotStateListener::ObserveSlot (const OUString& rSlotName)
+{
+    ThrowIfDisposed();
+
+    if (maCallback.IsSet())
+    {
+        // Connect the state change listener.
+        util::URL aURL (MakeURL(rSlotName));
+        uno::Reference<frame::XDispatch> xDispatch (GetDispatch(aURL));
+        if (xDispatch.is())
+        {
+            maRegisteredURLList.push_back(aURL);
+            xDispatch->addStatusListener(this,aURL);
+        }
+    }
+}
+
+void SlotStateListener::disposing(std::unique_lock<std::mutex>&)
+{
+    ReleaseListeners();
+    mxDispatchProviderWeak.clear();
+    maCallback = Link<const OUString&,void>();
+}
+
+util::URL SlotStateListener::MakeURL (const OUString& rSlotName)
+{
+    util::URL aURL;
+    aURL.Complete = rSlotName;
+
+    uno::Reference<util::XURLTransformer> xTransformer(util::URLTransformer::create(::comphelper::getProcessComponentContext()));
+    xTransformer->parseStrict(aURL);
+
+    return aURL;
+}
+
+uno::Reference<frame::XDispatch>
+    SlotStateListener::GetDispatch (const util::URL& rURL) const
+{
+    uno::Reference<frame::XDispatch> xDispatch;
+
+    uno::Reference<frame::XDispatchProvider> xDispatchProvider (mxDispatchProviderWeak);
+    if (xDispatchProvider.is())
+        xDispatch = xDispatchProvider->queryDispatch(rURL, OUString(), 0);
+
+    return xDispatch;
+}
+
+void SlotStateListener::statusChanged (
+    const frame::FeatureStateEvent& rState)
+{
+    ThrowIfDisposed();
+    OUString sSlotName (rState.FeatureURL.Complete);
+    maCallback.Call(sSlotName);
+}
+
+void SlotStateListener::ReleaseListeners()
+{
+    for (const auto& rURL : maRegisteredURLList)
+    {
+        uno::Reference<frame::XDispatch> xDispatch (GetDispatch(rURL));
+        if (xDispatch.is())
+        {
+            xDispatch->removeStatusListener(this,rURL);
+        }
+    }
+}
+
+//=====  lang::XEventListener  ================================================
+
+void SAL_CALL SlotStateListener::disposing (
+    const lang::EventObject& )
+{
+}
+
+void SlotStateListener::ThrowIfDisposed()
+{
+    if (m_bDisposed)
+    {
+        throw lang::DisposedException ("SlideSorterController object has already been disposed",
+            static_cast<uno::XWeak*>(this));
+    }
+}
+
+} // end of namespace ::sd::tools
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */