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-rw-r--r-- | sd/source/ui/inc/tools/SlotStateListener.hxx | 138 |
1 files changed, 138 insertions, 0 deletions
diff --git a/sd/source/ui/inc/tools/SlotStateListener.hxx b/sd/source/ui/inc/tools/SlotStateListener.hxx new file mode 100644 index 000000000..54a2e463d --- /dev/null +++ b/sd/source/ui/inc/tools/SlotStateListener.hxx @@ -0,0 +1,138 @@ +/* -*- 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 . + */ + +#pragma once + +#include <com/sun/star/frame/XStatusListener.hpp> +#include <comphelper/compbase.hxx> +#include <tools/link.hxx> +#include <cppuhelper/weakref.hxx> + +namespace com::sun::star::frame { class XDispatch; } +namespace com::sun::star::frame { class XDispatchProvider; } +namespace com::sun::star::frame { class XStatusListener; } +namespace com::sun::star::frame { struct FeatureStateEvent; } + +namespace sd::tools { + +typedef comphelper::WeakComponentImplHelper< + css::frame::XStatusListener + > SlotStateListenerInterfaceBase; + +/** Listen for state changes of slots. This class has been created in order + to be informed when the support for vertical writing changes but it can + be used to relay state changes of other slots as well. +*/ +class SlotStateListener final + : public SlotStateListenerInterfaceBase +{ +public: + /** This convenience version of the constructor takes all parameters + that are necessary to observe a single slot. See descriptions of + the SetCallback(), ConnectToFrame(), and ObserveSlot() methods for + explanations about the parameters. + */ + SlotStateListener ( + Link<const OUString&,void> const & rCallback, + const css::uno::Reference<css::frame::XDispatchProvider>& rxDispatchProvider, + const OUString& rSlotName); + + /** The constructor de-registers all remaining listeners. Usually a prior + dispose() call should have done that already. + */ + virtual ~SlotStateListener() override; + + /** Set the callback to the given value. Whenever one of the observed + slots changes its state this callback is informed about it. + Changing the callback does not release the listeners. + @throws DisposedException + */ + void SetCallback (const Link<const OUString&,void>& rCallback); + + /** Set the frame whose slots shall be observed. When an object of this + class is already observing slots of another frame then these + listeners are released first. + @throws DisposedException + */ + void ConnectToDispatchProvider ( + const css::uno::Reference<css::frame::XDispatchProvider>& rxDispatchProvider); + + /** Observe the slot specified by the given name. Note that + ConnectToFrame() has to have been called earlier. + @param rSlotName + The name of the slot to observe. An example is + ".uno:VerticalTextState". + @throws DisposedException + */ + void ObserveSlot (const OUString& rSlotName); + + //===== frame::XStatusListener ========================================== + + /** Called by slot state change broadcasters. In turn the callback is + informed about the state change. + @throws DisposedException + */ + virtual void SAL_CALL + statusChanged ( + const css::frame::FeatureStateEvent& rState) override; + + //===== lang::XEventListener ============================================ + + virtual void SAL_CALL + disposing(const css::lang::EventObject& rEvent) override; + +private: + /** This method is called by the WeakComponentImplHelper base class in + reaction to a XComponent::dispose() call. It releases all currently + active listeners. + */ + virtual void disposing(std::unique_lock<std::mutex>&) override; + + Link<const OUString&,void> maCallback; + + /** Remember the URLs that describe slots whose state changes we are + listening to. + */ + std::vector<css::util::URL> maRegisteredURLList; + + css::uno::WeakReference<css::frame::XDispatchProvider> mxDispatchProviderWeak; + + /** Deregister all currently active state change listeners. + */ + void ReleaseListeners(); + + /** @throws css::lang::DisposedException when the object has already been + disposed. + */ + void ThrowIfDisposed(); + + /** Transform the given string into a URL object. + */ + static css::util::URL MakeURL (const OUString& rSlotName); + + /** Return an XDispatch object for the given URL. + */ + css::uno::Reference<css::frame::XDispatch> + GetDispatch ( + const css::util::URL& rURL) const; +}; + +} // end of namespace ::sd::tools + +/* vim:set shiftwidth=4 softtabstop=4 expandtab: */ |