itemexchangemodel.cpp File Reference

Implementation of ItemExchangeModel. More...

#include "./itemexchangemodel.h"
#include <QCollator>
#include <QSet>
#include <algorithm>
#include <pse-savefile/expanded/fragments/itemstoragebox.h>
#include <pse-savefile/expanded/player/playerbasics.h>
#include <pse-db/itemsdb.h>
#include <pse-db/entries/itemdbentry.h>

Include dependency graph for itemexchangemodel.cpp:

Go to the source code of this file.

Detailed Description

Implementation of ItemExchangeModel.

See itemexchangemodel.h.

The exchange is one net axis m_net (like the money<->coins converter's coin axis). Positive net = gained-A steps, negative = gained-B. The WHOLE net is priced as a single trade (giveFor/refundFor): the total value being bought is rounded up to a whole number of the given item, and only that one leftover comes back as money. Rounding the total – not each step – is what makes an even trade free of change: 3 Fresh Water (₽600) costs exactly 2 Potions (₽600) and refunds nothing.

The after-counts and money for any candidate net are pure functions (aAfterFor/bAfterFor/ moneyAfterFor), which the "+" gating and the preview both use; checkout() writes exactly that net via the box add/remove helpers (bag first, then PC storage).

Definition in file itemexchangemodel.cpp.