1
  2
  3
  4
  5
  6
  7
  8
  9
 10
 11
 12
 13
 14
 15
 16
 17
 18
 19
 20
 21
 22
 23
 24
 25
 26
 27
 28
 29
 30
 31
 32
 33
 34
 35
 36
 37
 38
 39
 40
 41
 42
 43
 44
 45
 46
 47
 48
 49
 50
 51
 52
 53
 54
 55
 56
 57
 58
 59
 60
 61
 62
 63
 64
 65
 66
 67
 68
 69
 70
 71
 72
 73
 74
 75
 76
 77
 78
 79
 80
 81
 82
 83
 84
 85
 86
 87
 88
 89
 90
 91
 92
 93
 94
 95
 96
 97
 98
 99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
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: */