sd/source/ui/inc/tools/AsynchronousCall.hxx

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  19
  20 #ifndef INCLUDED_SD_SOURCE_UI_INC_TOOLS_ASYNCHRONOUSCALL_HXX
  21 #define INCLUDED_SD_SOURCE_UI_INC_TOOLS_ASYNCHRONOUSCALL_HXX
  22
  23 #include <vcl/timer.hxx>
  24
  25 #include <memory>
  26 #include <functional>
  27
  28 namespace sd { namespace tools {
  29
  30 /** Store a function object and execute it asynchronous.
  31
  32     The features of this class are:
  33     a) It provides a wrapper around a VCL Timer so that generic function
  34     objects can be used.
  35     b) When more than one function objects are posted to be executed later
  36     then the pending ones are erased and only the last one will actually be
  37     executed.
  38
  39     Use this class like this:
  40     aInstanceOfAsynchronousCall.Post(
  41         ::std::bind(
  42             ::std::mem_fun(&DrawViewShell::SwitchPage),
  43             pDrawViewShell,
  44             11));
  45 */
  46 class AsynchronousCall
  47 {
  48 public:
  49     /** Create a new asynchronous call.  Each object of this class processes
  50         one (semantical) type of call.
  51     */
  52     AsynchronousCall();
  53
  54     ~AsynchronousCall();
  55
  56     /** Post a function object that is to be executed asynchronously.  When
  57         this method is called while the current function object has not been
  58         executed then the latter is destroyed and only the given function
  59         object will be executed.
  60         @param rFunction
  61             The function object that may be called asynchronously in the
  62             near future.
  63     */
  64     typedef ::std::function<void ()> AsynchronousFunction;
  65     void Post (
  66         const AsynchronousFunction& rFunction);
  67
  68 private:
  69     Timer maTimer;
  70     /** The function object that will be executed when the TimerCallback
  71         function is called the next time.  This pointer may be NULL.
  72     */
  73     ::std::unique_ptr<AsynchronousFunction> mpFunction;
  74     DECL_LINK(TimerCallback,Timer*,void);
  75 };
  76
  77 } } // end of namespace ::sd::tools
  78
  79 #endif
  80
  81 /* vim:set shiftwidth=4 softtabstop=4 expandtab: */