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

   1 /* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
   2 /*
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   9  * This file incorporates work covered by the following license notice:
  10  *
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  15  *   License, Version 2.0 (the "License"); you may not use this file
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  17  *   the License at http://www.apache.org/licenses/LICENSE-2.0 .
  18  */
  19
  20 #pragma once
  21
  22 #include <vcl/timer.hxx>
  23
  24 #include <memory>
  25 #include <functional>
  26
  27 namespace sd::tools
  28 {
  29 /** Store a function object and execute it asynchronous.
  30
  31     The features of this class are:
  32     a) It provides a wrapper around a VCL Timer so that generic function
  33     objects can be used.
  34     b) When more than one function objects are posted to be executed later
  35     then the pending ones are erased and only the last one will actually be
  36     executed.
  37
  38     Use this class like this:
  39     aInstanceOfAsynchronousCall.Post(
  40         ::std::bind(
  41             ::std::mem_fun(&DrawViewShell::SwitchPage),
  42             pDrawViewShell,
  43             11));
  44 */
  45 class AsynchronousCall
  46 {
  47 public:
  48     /** Create a new asynchronous call.  Each object of this class processes
  49         one (semantical) type of call.
  50     */
  51     AsynchronousCall();
  52
  53     ~AsynchronousCall();
  54
  55     /** Post a function object that is to be executed asynchronously.  When
  56         this method is called while the current function object has not been
  57         executed then the latter is destroyed and only the given function
  58         object will be executed.
  59         @param rFunction
  60             The function object that may be called asynchronously in the
  61             near future.
  62     */
  63     typedef ::std::function<void()> AsynchronousFunction;
  64     void Post(const AsynchronousFunction& rFunction);
  65
  66 private:
  67     Timer maTimer;
  68     /** The function object that will be executed when the TimerCallback
  69         function is called the next time.  This pointer may be NULL.
  70     */
  71     ::std::unique_ptr<AsynchronousFunction> mpFunction;
  72     DECL_LINK(TimerCallback, Timer*, void);
  73 };
  74
  75 } // end of namespace ::sd::tools
  76
  77 /* vim:set shiftwidth=4 softtabstop=4 expandtab: */