src/gromacs/onlinehelp/ihelptopic.h

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  35 /*! \libinternal \file
  36  * \brief
  37  * Declares gmx::IHelpTopic.
  38  *
  39  * \author Teemu Murtola <teemu.murtola@gmail.com>
  40  * \inlibraryapi
  41  * \ingroup module_onlinehelp
  42  */
  43 #ifndef GMX_ONLINEHELP_IHELPTOPIC_H
  44 #define GMX_ONLINEHELP_IHELPTOPIC_H
  45
  46 #include <memory>
  47
  48 namespace gmx
  49 {
  50
  51 class HelpWriterContext;
  52
  53 /*! \libinternal \brief
  54  * Provides a single online help topic.
  55  *
  56  * Implementations of these methods should not throw, except that writeHelp()
  57  * is allowed to throw on out-of-memory or I/O errors since those it cannot
  58  * avoid.
  59  *
  60  * Header helptopic.h contains classes that implement this interface and make
  61  * it simple to write concrete help topic classes.
  62  *
  63  * \inlibraryapi
  64  * \ingroup module_onlinehelp
  65  */
  66 class IHelpTopic
  67 {
  68     public:
  69         virtual ~IHelpTopic() {}
  70
  71         /*! \brief
  72          * Returns the name of the topic.
  73          *
  74          * This should be a single lowercase word, used to identify the topic.
  75          * It is not used for the root of the help topic tree.
  76          */
  77         virtual const char *name() const = 0;
  78         /*! \brief
  79          * Returns a title for the topic.
  80          *
  81          * May return NULL, in which case the topic is omitted from normal
  82          * subtopic lists and no title is printed by the methods provided in
  83          * helptopic.h.
  84          */
  85         virtual const char *title() const = 0;
  86
  87         //! Returns whether the topic has any subtopics.
  88         virtual bool hasSubTopics() const = 0;
  89         /*! \brief
  90          * Finds a subtopic by name.
  91          *
  92          * \param[in] name  Name of subtopic to find.
  93          * \returns   Pointer to the found subtopic, or NULL if matching topic
  94          *      is not found.
  95          */
  96         virtual const IHelpTopic *findSubTopic(const char *name) const = 0;
  97
  98         /*! \brief
  99          * Prints the help text for this topic.
 100          *
 101          * \param[in] context  Context object for writing the help.
 102          * \throws    std::bad_alloc if out of memory.
 103          * \throws    FileIOError on any I/O error.
 104          */
 105         virtual void writeHelp(const HelpWriterContext &context) const = 0;
 106 };
 107
 108 //! Smart pointer type to manage a IHelpTopic object.
 109 typedef std::unique_ptr<IHelpTopic> HelpTopicPointer;
 110
 111 } // namespace gmx
 112
 113 #endif