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19 
20 #ifndef INCLUDED_SD_SOURCE_UI_INC_MASTERPAGEOBSERVER_HXX
21 #define INCLUDED_SD_SOURCE_UI_INC_MASTERPAGEOBSERVER_HXX
22 
23 #include <rtl/ustring.hxx>
24 #include <tools/link.hxx>
25 #include "tools/SdGlobalResourceContainer.hxx"
26 #include <memory>
27 #include <set>
28 
29 namespace osl { class Mutex; }
30 
31 class SdDrawDocument;
32 
33 namespace sd {
34 
35 class MasterPageObserverEvent;
36 
37 /** This singleton observes all registered documents for changes in the used
38     master pages and in turn informs its listeners about it.  One such
39     listener is the master page selector control in the tool panel that
40     shows the recently used master pages.
41 */
42 class MasterPageObserver
43     : public SdGlobalResource
44 {
45 public:
46     typedef ::std::set<OUString> MasterPageNameSet;
47 
48     /** Return the single instance of this class.
49     */
50     static MasterPageObserver& Instance();
51 
52     /** The master page observer will listen to events of this document and
53         detect changes of the use of master pages.
54     */
55     void RegisterDocument (SdDrawDocument& rDocument);
56 
57     /** The master page observer will stop to listen to events of this
58         document.
59     */
60     void UnregisterDocument (SdDrawDocument& rDocument);
61 
62     /** Add a listener that is informed of master pages that are newly
63         assigned to slides or become unassigned.
64         @param rEventListener
65             The event listener to call for future events.  Call
66             RemoveEventListener() before the listener is destroyed.
67     */
68     void AddEventListener (const Link<MasterPageObserverEvent&,void>& rEventListener);
69 
70     /** Remove the given listener from the list of listeners.
71         @param rEventListener
72             After this method returns the given listener is not called back
73             from this object.  Passing a listener that has not
74             been registered before is safe and is silently ignored.
75     */
76     void RemoveEventListener (const Link<MasterPageObserverEvent&,void>& rEventListener);
77 
78 private:
79     static ::osl::Mutex maMutex;
80 
81     class Implementation;
82     ::std::unique_ptr<Implementation> mpImpl;
83 
84     MasterPageObserver();
85     virtual ~MasterPageObserver() override;
86 
87     MasterPageObserver (const MasterPageObserver&) = delete;
88 
89     MasterPageObserver& operator= (const MasterPageObserver&) = delete;
90 };
91 
92 /** Objects of this class are sent to listeners of the MasterPageObserver
93     singleton when the list of master pages of one document has changed.
94 */
95 class MasterPageObserverEvent
96 {
97 public:
98     enum EventType {
99         /// Master page already exists when document is registered.
100         ET_MASTER_PAGE_EXISTS,
101         /// Master page has been added to a document.
102         ET_MASTER_PAGE_ADDED,
103         /// Master page has been removed from to a document.
104         ET_MASTER_PAGE_REMOVED
105     };
106 
107     EventType const meType;
108     const OUString& mrMasterPageName;
109 
MasterPageObserverEvent(EventType eType,const OUString & rMasterPageName)110     MasterPageObserverEvent (
111         EventType eType,
112         const OUString& rMasterPageName)
113         : meType(eType),
114           mrMasterPageName(rMasterPageName)
115     {}
116 
117 };
118 
119 } // end of namespace sd
120 
121 #endif
122 
123 /* vim:set shiftwidth=4 softtabstop=4 expandtab: */
124