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92 lines
3.6 KiB
C++
92 lines
3.6 KiB
C++
#ifndef MWGUI_JOURNALVIEWMODEL_HPP
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#define MWGUI_JOURNALVIEWMODEL_HPP
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#include <string>
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#include <memory>
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#include <functional>
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#include <stdint.h>
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#include <components/misc/utf8stream.hpp>
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namespace MWGui
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{
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/// View-Model for the journal GUI
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///
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/// This interface defines an abstract data model suited
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/// specifically to the needs of the journal GUI. It isolates
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/// the journal GUI from the implementation details of the
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/// game data store.
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struct JournalViewModel
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{
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typedef std::shared_ptr <JournalViewModel> Ptr;
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typedef intptr_t QuestId;
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typedef intptr_t TopicId;
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typedef uint8_t const * Utf8Point;
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typedef std::pair <Utf8Point, Utf8Point> Utf8Span;
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/// The base interface for both journal entries and topics.
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struct Entry
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{
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/// returns the body text for the journal entry
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///
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/// This function returns a borrowed reference to the body of the
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/// journal entry. The returned reference becomes invalid when the
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/// entry is destroyed.
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virtual Utf8Span body () const = 0;
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/// Visits each subset of text in the body, delivering the beginning
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/// and end of the span relative to the body, and a valid topic ID if
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/// the span represents a keyword, or zero if not.
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virtual void visitSpans (std::function <void (TopicId, size_t, size_t)> visitor) const = 0;
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};
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/// An interface to topic data.
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struct TopicEntry : Entry
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{
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/// Returns a pre-formatted span of UTF8 encoded text representing
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/// the name of the NPC this portion of dialog was heard from.
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virtual Utf8Span source () const = 0;
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};
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/// An interface to journal data.
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struct JournalEntry : Entry
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{
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/// Returns a pre-formatted span of UTF8 encoded text representing
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/// the in-game date this entry was added to the journal.
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virtual Utf8Span timestamp () const = 0;
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};
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/// called prior to journal opening
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virtual void load () = 0;
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/// called prior to journal closing
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virtual void unload () = 0;
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/// returns true if their are no journal entries to display
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virtual bool isEmpty () const = 0;
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/// walks the active and optionally completed, quests providing the name and completed status
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virtual void visitQuestNames (bool active_only, std::function <void (const std::string&, bool)> visitor) const = 0;
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/// walks over the journal entries related to all quests with the given name
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/// If \a questName is empty, simply visits all journal entries
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virtual void visitJournalEntries (const std::string& questName, std::function <void (JournalEntry const &)> visitor) const = 0;
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/// provides the name of the topic specified by its id
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virtual void visitTopicName (TopicId topicId, std::function <void (Utf8Span)> visitor) const = 0;
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/// walks over the topics whose names start with the character
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virtual void visitTopicNamesStartingWith (Utf8Stream::UnicodeChar character, std::function < void (const std::string&) > visitor) const = 0;
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/// walks over the topic entries for the topic specified by its identifier
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virtual void visitTopicEntries (TopicId topicId, std::function <void (TopicEntry const &)> visitor) const = 0;
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// create an instance of the default journal view model implementation
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static Ptr create ();
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};
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}
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#endif // MWGUI_JOURNALVIEWMODEL_HPP
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