summaryrefslogtreecommitdiffstats
path: root/framework/source/services/ContextChangeEventMultiplexer.cxx
diff options
context:
space:
mode:
Diffstat (limited to 'framework/source/services/ContextChangeEventMultiplexer.cxx')
-rw-r--r--framework/source/services/ContextChangeEventMultiplexer.cxx366
1 files changed, 366 insertions, 0 deletions
diff --git a/framework/source/services/ContextChangeEventMultiplexer.cxx b/framework/source/services/ContextChangeEventMultiplexer.cxx
new file mode 100644
index 000000000..b2f6db457
--- /dev/null
+++ b/framework/source/services/ContextChangeEventMultiplexer.cxx
@@ -0,0 +1,366 @@
+/* -*- 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 <helper/mischelper.hxx>
+#include <com/sun/star/lang/IllegalArgumentException.hpp>
+#include <com/sun/star/lang/XComponent.hpp>
+#include <com/sun/star/lang/XEventListener.hpp>
+#include <com/sun/star/lang/XServiceInfo.hpp>
+#include <com/sun/star/ui/XContextChangeEventMultiplexer.hpp>
+#include <com/sun/star/ui/ContextChangeEventMultiplexer.hpp>
+#include <com/sun/star/uno/XComponentContext.hpp>
+
+#include <comphelper/compbase.hxx>
+#include <cppuhelper/supportsservice.hxx>
+#include <rtl/ref.hxx>
+#include <osl/diagnose.h>
+
+#include <algorithm>
+#include <map>
+#include <vector>
+
+using namespace css;
+using namespace css::uno;
+
+namespace {
+
+typedef comphelper::WeakComponentImplHelper <
+ css::ui::XContextChangeEventMultiplexer,
+ css::lang::XServiceInfo,
+ css::lang::XEventListener
+ > ContextChangeEventMultiplexerInterfaceBase;
+
+class ContextChangeEventMultiplexer
+ : public ContextChangeEventMultiplexerInterfaceBase
+{
+public:
+ ContextChangeEventMultiplexer();
+ ContextChangeEventMultiplexer(const ContextChangeEventMultiplexer&) = delete;
+ ContextChangeEventMultiplexer& operator=(const ContextChangeEventMultiplexer&) = delete;
+
+ virtual void disposing(std::unique_lock<std::mutex>&) override;
+
+ // XContextChangeEventMultiplexer
+ virtual void SAL_CALL addContextChangeEventListener (
+ const css::uno::Reference<css::ui::XContextChangeEventListener>& rxListener,
+ const css::uno::Reference<css::uno::XInterface>& rxEventFocus) override;
+ virtual void SAL_CALL removeContextChangeEventListener (
+ const css::uno::Reference<css::ui::XContextChangeEventListener>& rxListener,
+ const css::uno::Reference<css::uno::XInterface>& rxEventFocus) override;
+ virtual void SAL_CALL removeAllContextChangeEventListeners (
+ const css::uno::Reference<css::ui::XContextChangeEventListener>& rxListener) override;
+ virtual void SAL_CALL broadcastContextChangeEvent (
+ const css::ui::ContextChangeEventObject& rContextChangeEventObject,
+ const css::uno::Reference<css::uno::XInterface>& rxEventFocus) override;
+
+ // XServiceInfo
+ virtual OUString SAL_CALL getImplementationName() override;
+ virtual sal_Bool SAL_CALL supportsService (
+ const OUString& rsServiceName) override;
+ virtual css::uno::Sequence< OUString> SAL_CALL getSupportedServiceNames() override;
+
+ // XEventListener
+ virtual void SAL_CALL disposing (
+ const css::lang::EventObject& rEvent) override;
+
+ typedef ::std::vector<css::uno::Reference<css::ui::XContextChangeEventListener> > ListenerContainer;
+ class FocusDescriptor
+ {
+ public:
+ ListenerContainer maListeners;
+ OUString msCurrentApplicationName;
+ OUString msCurrentContextName;
+ };
+ typedef ::std::map<css::uno::Reference<css::uno::XInterface>, FocusDescriptor> ListenerMap;
+ ListenerMap maListeners;
+
+ /** Notify all listeners in the container that is associated with
+ the given event focus.
+
+ Typically called twice from broadcastEvent(), once for the
+ given event focus and once for NULL.
+ */
+ void BroadcastEventToSingleContainer (
+ const css::ui::ContextChangeEventObject& rEventObject,
+ const css::uno::Reference<css::uno::XInterface>& rxEventFocus);
+ FocusDescriptor* GetFocusDescriptor (
+ const css::uno::Reference<css::uno::XInterface>& rxEventFocus,
+ const bool bCreateWhenMissing);
+};
+
+ContextChangeEventMultiplexer::ContextChangeEventMultiplexer()
+{
+}
+
+void ContextChangeEventMultiplexer::disposing(std::unique_lock<std::mutex>& rGuard)
+{
+ ListenerMap aListeners;
+ aListeners.swap(maListeners);
+
+ rGuard.unlock();
+
+ css::uno::Reference<css::uno::XInterface> xThis (static_cast<XWeak*>(this));
+ css::lang::EventObject aEvent (xThis);
+ for (auto const& container : aListeners)
+ {
+ // Unregister from the focus object.
+ Reference<lang::XComponent> xComponent (container.first, UNO_QUERY);
+ if (xComponent.is())
+ xComponent->removeEventListener(this);
+
+ // Tell all listeners that we are being disposed.
+ const FocusDescriptor& rFocusDescriptor (container.second);
+ for (auto const& listener : rFocusDescriptor.maListeners)
+ {
+ listener->disposing(aEvent);
+ }
+ }
+}
+
+// XContextChangeEventMultiplexer
+void SAL_CALL ContextChangeEventMultiplexer::addContextChangeEventListener (
+ const css::uno::Reference<css::ui::XContextChangeEventListener>& rxListener,
+ const css::uno::Reference<css::uno::XInterface>& rxEventFocus)
+{
+ if ( ! rxListener.is())
+ throw css::lang::IllegalArgumentException(
+ "can not add an empty reference",
+ static_cast<XWeak*>(this),
+ 0);
+
+ FocusDescriptor* pFocusDescriptor = GetFocusDescriptor(rxEventFocus, true);
+ if (pFocusDescriptor != nullptr)
+ {
+ ListenerContainer& rContainer (pFocusDescriptor->maListeners);
+ if (::std::find(rContainer.begin(), rContainer.end(), rxListener) != rContainer.end())
+ {
+ // The listener was added for the same event focus
+ // previously. That is an error.
+ throw css::lang::IllegalArgumentException("listener added twice", static_cast<XWeak*>(this), 0);
+ }
+ rContainer.push_back(rxListener);
+ }
+
+ // Send out an initial event that informs the new listener about
+ // the current context.
+ if (!(rxEventFocus.is() && pFocusDescriptor!=nullptr))
+ return;
+
+ css::ui::ContextChangeEventObject aEvent (
+ nullptr,
+ pFocusDescriptor->msCurrentApplicationName,
+ pFocusDescriptor->msCurrentContextName);
+ rxListener->notifyContextChangeEvent(aEvent);
+}
+
+void SAL_CALL ContextChangeEventMultiplexer::removeContextChangeEventListener (
+ const css::uno::Reference<css::ui::XContextChangeEventListener>& rxListener,
+ const css::uno::Reference<css::uno::XInterface>& rxEventFocus)
+{
+ if ( ! rxListener.is())
+ throw css::lang::IllegalArgumentException(
+ "can not remove an empty reference",
+ static_cast<XWeak*>(this), 0);
+
+ FocusDescriptor* pFocusDescriptor = GetFocusDescriptor(rxEventFocus, false);
+ if (pFocusDescriptor == nullptr)
+ return;
+
+ ListenerContainer& rContainer (pFocusDescriptor->maListeners);
+ const ListenerContainer::iterator iListener (
+ ::std::find(rContainer.begin(), rContainer.end(), rxListener));
+ if (iListener != rContainer.end())
+ {
+ rContainer.erase(iListener);
+
+ // We hold on to the focus descriptor even when the last listener has been removed.
+ // This allows us to keep track of the current context and send it to new listeners.
+ }
+
+}
+
+void SAL_CALL ContextChangeEventMultiplexer::removeAllContextChangeEventListeners (
+ const css::uno::Reference<css::ui::XContextChangeEventListener>& rxListener)
+{
+ if ( ! rxListener.is())
+ throw css::lang::IllegalArgumentException(
+ "can not remove an empty reference",
+ static_cast<XWeak*>(this), 0);
+
+ for (auto& rContainer : maListeners)
+ {
+ const ListenerContainer::iterator iListener (
+ ::std::find(rContainer.second.maListeners.begin(), rContainer.second.maListeners.end(), rxListener));
+ if (iListener != rContainer.second.maListeners.end())
+ {
+ rContainer.second.maListeners.erase(iListener);
+
+ // We hold on to the focus descriptor even when the last listener has been removed.
+ // This allows us to keep track of the current context and send it to new listeners.
+ }
+ }
+}
+
+void SAL_CALL ContextChangeEventMultiplexer::broadcastContextChangeEvent (
+ const css::ui::ContextChangeEventObject& rEventObject,
+ const css::uno::Reference<css::uno::XInterface>& rxEventFocus)
+{
+ // Remember the current context.
+ if (rxEventFocus.is())
+ {
+ FocusDescriptor* pFocusDescriptor = GetFocusDescriptor(rxEventFocus, true);
+ if (pFocusDescriptor != nullptr)
+ {
+ pFocusDescriptor->msCurrentApplicationName = rEventObject.ApplicationName;
+ pFocusDescriptor->msCurrentContextName = rEventObject.ContextName;
+ }
+ }
+
+ BroadcastEventToSingleContainer(rEventObject, rxEventFocus);
+ if (rxEventFocus.is())
+ BroadcastEventToSingleContainer(rEventObject, nullptr);
+}
+
+void ContextChangeEventMultiplexer::BroadcastEventToSingleContainer (
+ const css::ui::ContextChangeEventObject& rEventObject,
+ const css::uno::Reference<css::uno::XInterface>& rxEventFocus)
+{
+ FocusDescriptor* pFocusDescriptor = GetFocusDescriptor(rxEventFocus, false);
+ if (pFocusDescriptor != nullptr)
+ {
+ // Create a copy of the listener container to avoid problems
+ // when one of the called listeners calls add... or remove...
+ ListenerContainer aContainer (pFocusDescriptor->maListeners);
+ for (auto const& listener : aContainer)
+ {
+ listener->notifyContextChangeEvent(rEventObject);
+ }
+ }
+}
+
+ContextChangeEventMultiplexer::FocusDescriptor* ContextChangeEventMultiplexer::GetFocusDescriptor (
+ const css::uno::Reference<css::uno::XInterface>& rxEventFocus,
+ const bool bCreateWhenMissing)
+{
+ ListenerMap::iterator iDescriptor (maListeners.find(rxEventFocus));
+ if (iDescriptor == maListeners.end() && bCreateWhenMissing)
+ {
+ // Listen for the focus being disposed.
+ Reference<lang::XComponent> xComponent (rxEventFocus, UNO_QUERY);
+ if (xComponent.is())
+ xComponent->addEventListener(this);
+
+ // Create a new listener container for the event focus.
+ iDescriptor = maListeners.emplace(
+ rxEventFocus,
+ FocusDescriptor()).first;
+ }
+ if (iDescriptor != maListeners.end())
+ return &iDescriptor->second;
+ else
+ return nullptr;
+}
+
+OUString SAL_CALL ContextChangeEventMultiplexer::getImplementationName()
+{
+ return "org.apache.openoffice.comp.framework.ContextChangeEventMultiplexer";
+}
+
+sal_Bool SAL_CALL ContextChangeEventMultiplexer::supportsService ( const OUString& rsServiceName)
+{
+ return cppu::supportsService(this, rsServiceName);
+}
+
+css::uno::Sequence<OUString> SAL_CALL ContextChangeEventMultiplexer::getSupportedServiceNames()
+{
+ // it's a singleton, not a service
+ return css::uno::Sequence<OUString>();
+}
+
+void SAL_CALL ContextChangeEventMultiplexer::disposing ( const css::lang::EventObject& rEvent)
+{
+ ListenerMap::iterator iDescriptor (maListeners.find(rEvent.Source));
+
+ if (iDescriptor == maListeners.end())
+ {
+ OSL_ASSERT(iDescriptor != maListeners.end());
+ return;
+ }
+
+ // Should we notify the remaining listeners?
+
+ maListeners.erase(iDescriptor);
+}
+
+}
+
+namespace framework {
+
+// right now we assume there's one matching listener
+static uno::Reference<ui::XContextChangeEventListener> GetFirstListenerWith_ImplImpl(
+ css::uno::Reference<css::uno::XComponentContext> const & xComponentContext,
+ uno::Reference<uno::XInterface> const& xEventFocus,
+ std::function<bool (uno::Reference<ui::XContextChangeEventListener> const&)> const& rPredicate)
+{
+ assert(xEventFocus.is()); // in current usage it's a bug if the XController is null here
+ uno::Reference<ui::XContextChangeEventListener> xRet;
+
+ rtl::Reference<ContextChangeEventMultiplexer> pMultiplexer =
+ dynamic_cast<ContextChangeEventMultiplexer *>(ui::ContextChangeEventMultiplexer::get(xComponentContext).get());
+ assert(pMultiplexer);
+
+ ContextChangeEventMultiplexer::FocusDescriptor const*const pFocusDescriptor(
+ pMultiplexer->GetFocusDescriptor(xEventFocus, false));
+ if (!pFocusDescriptor)
+ return xRet;
+
+ for (auto & xListener : pFocusDescriptor->maListeners)
+ {
+ if (rPredicate(xListener))
+ {
+ assert(!xRet.is()); // generalize this if it is used for more than 1:1 mapping?
+ xRet = xListener;
+ }
+ }
+ return xRet;
+}
+
+namespace {
+
+struct Hook
+{
+ Hook() { g_pGetMultiplexerListener = &GetFirstListenerWith_ImplImpl; }
+ ~Hook() { g_pGetMultiplexerListener = nullptr; }
+};
+
+Hook g_hook;
+
+}
+
+}
+
+extern "C" SAL_DLLPUBLIC_EXPORT css::uno::XInterface *
+org_apache_openoffice_comp_framework_ContextChangeEventMultiplexer_get_implementation(
+ css::uno::XComponentContext *,
+ css::uno::Sequence<css::uno::Any> const &)
+{
+ return cppu::acquire(new ContextChangeEventMultiplexer());
+}
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */