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396 | /* -*- 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/uno/XComponentContext.hpp>
#include <cppuhelper/compbase.hxx>
#include <cppuhelper/supportsservice.hxx>
#include <cppuhelper/basemutex.hxx>
#include <algorithm>
#include <map>
#include <vector>
using namespace css;
using namespace css::uno;
namespace {
typedef ::cppu::WeakComponentImplHelper <
css::ui::XContextChangeEventMultiplexer,
css::lang::XServiceInfo,
css::lang::XEventListener
> ContextChangeEventMultiplexerInterfaceBase;
class ContextChangeEventMultiplexer
: private ::cppu::BaseMutex,
public ContextChangeEventMultiplexerInterfaceBase
{
public:
ContextChangeEventMultiplexer();
ContextChangeEventMultiplexer(const ContextChangeEventMultiplexer&) = delete;
ContextChangeEventMultiplexer& operator=(const ContextChangeEventMultiplexer&) = delete;
virtual void SAL_CALL disposing() 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()
: ContextChangeEventMultiplexerInterfaceBase(m_aMutex),
maListeners()
{
}
void SAL_CALL ContextChangeEventMultiplexer::disposing()
{
ListenerMap aListeners;
aListeners.swap(maListeners);
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;
if (pFocusDescriptor->msCurrentApplicationName.isEmpty() && pFocusDescriptor->msCurrentContextName.isEmpty()
&& rxEventFocus.is())
{
Reference< lang::XServiceInfo > xServInfo( rxEventFocus, uno::UNO_QUERY );
if( xServInfo.is() && xServInfo->getImplementationName() == "com.sun.star.comp.chart2.ChartController")
{
css::ui::ContextChangeEventObject aEvent (
rxEventFocus,
"com.sun.star.chart2.ChartDocument",
"Chart");
rxListener->notifyContextChangeEvent(aEvent);
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);
}
struct Instance {
explicit Instance():
instance(static_cast<cppu::OWeakObject *>(
new ContextChangeEventMultiplexer()))
{
}
css::uno::Reference<css::uno::XInterface> instance;
};
struct Singleton:
public rtl::Static<Instance, Singleton>
{};
}
namespace framework {
// right now we assume there's one matching listener
static uno::Reference<ui::XContextChangeEventListener> GetFirstListenerWith_ImplImpl(
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;
ContextChangeEventMultiplexer *const pMultiplexer(
dynamic_cast<ContextChangeEventMultiplexer *>(Singleton::get().instance.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; }
};
static Hook g_hook;
}
}
extern "C" SAL_DLLPUBLIC_EXPORT css::uno::XInterface *
org_apache_openoffice_comp_framework_ContextChangeEventMultiplexer_get_implementation(<--- The function 'org_apache_openoffice_comp_framework_ContextChangeEventMultiplexer_get_implementation' is never used.
css::uno::XComponentContext *,
css::uno::Sequence<css::uno::Any> const &)
{
return cppu::acquire(static_cast<cppu::OWeakObject *>(
Singleton::get().instance.get()));
}
/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
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