File indexing completed on 2025-02-23 04:08:58

 /*
  *  SPDX-FileCopyrightText: 2016 Dmitry Kazakov <dimula73@gmail.com>
  *
  *  SPDX-License-Identifier: GPL-2.0-or-later
  */
 
 #include "kis_change_guides_command.h"
 
 #include "kis_guides_config.h"
 #include "KisDocument.h"
 #include <kis_image.h>
 
 #include <QList>
 #include <QListIterator>
 
 struct KisChangeGuidesCommand::Private
 {
     Private(KisDocument *_doc, KisChangeGuidesCommand *q) : doc(_doc), q(q), firstRedo(true) {}
 
     bool sameOrOnlyMovedOneGuideBetween(const KisGuidesConfig &first, const KisGuidesConfig &second);
     enum Status {
         NO_DIFF = 0,
         ONE_DIFF = 1,
         ADDITION = 4,
         REMOVAL = 16,
         OTHER_DIFF = 1024
     };
     Status diff(const QList<qreal> &first, const QList<qreal> &second);
 
     void switchTo(const KisGuidesConfig &config);
 
     KisDocument *doc;
     KisChangeGuidesCommand *q;
 
     KisGuidesConfig oldGuides;
     KisGuidesConfig newGuides;
 
     bool firstRedo;
 };
 
 bool KisChangeGuidesCommand::Private::sameOrOnlyMovedOneGuideBetween(const KisGuidesConfig &first, const KisGuidesConfig &second)
 {
     int ret = diff(first.horizontalGuideLines(), second.horizontalGuideLines()) +
         diff(first.verticalGuideLines(), second.verticalGuideLines());
 
     if (ret == ADDITION) {
         q->setText(kundo2_i18n("Add Guide"));
     } else if (ret == REMOVAL) {
         q->setText(kundo2_i18n("Remove Guide"));
     } else if (ret == NO_DIFF || ret == ONE_DIFF) { // meaning we will still merge it
         // XXX: how to deal with NO_DIFF (the command "should" be removed -- how?)
         q->setText(kundo2_i18n("Edit Guides"));
     } else {
         return false;
     }
     return true;
 }
 
 KisChangeGuidesCommand::Private::Status KisChangeGuidesCommand::Private::diff(const QList<qreal> &first, const QList<qreal> &second)
 {
     if (first.size() == second.size()) {
         int diffCount = 0;
         for (int i = 0; i < first.size(); ++i) {
             if (first[i] != second[i]) {
                 ++diffCount;
                 if (diffCount > 1) {
                     return OTHER_DIFF;
                 }
             }
         }
         return diffCount == 0 ? NO_DIFF : ONE_DIFF;
     } else if (first.size() - second.size() == -1) { // added a guide
         QList<qreal> beforeRemoval = second;
         beforeRemoval.takeLast();
         return first == beforeRemoval ? ADDITION : OTHER_DIFF;
     } else if (first.size() - second.size() == 1) { // removed a guide
         bool skippedItem = false;
         for (QListIterator<qreal> i(first), j(second); i.hasNext() && j.hasNext(); ) {
             qreal curFirst = i.next();
             qreal curSecond = j.next();
             if (!skippedItem && curFirst != curSecond) {
                 curFirst = i.next(); // try to go to the next item and see if it matches
             }
             if (curFirst != curSecond) {
                 return OTHER_DIFF;
             }
         }
         // here we conclude only one guide is removed
         return REMOVAL;
     } else {
         return OTHER_DIFF;
     }
 }
 
 void KisChangeGuidesCommand::Private::switchTo(const KisGuidesConfig &config)
 {
     KisGuidesConfig curConfig = doc->guidesConfig();
     curConfig.setHorizontalGuideLines(config.horizontalGuideLines());
     curConfig.setVerticalGuideLines(config.verticalGuideLines());
     doc->setGuidesConfig(curConfig);
 }
 
 KisChangeGuidesCommand::KisChangeGuidesCommand(KisDocument *doc, const KisGuidesConfig &oldGuides, const KisGuidesConfig &newGuides)
     : KUndo2Command(kundo2_i18n("Edit Guides")),
       m_d(new Private(doc, this))
 {
     m_d->oldGuides = oldGuides;
     m_d->newGuides = newGuides;
     // update the undo command text
     m_d->sameOrOnlyMovedOneGuideBetween(m_d->oldGuides, m_d->newGuides);
 }
 
 KisChangeGuidesCommand::~KisChangeGuidesCommand()
 {
 }
 
 void KisChangeGuidesCommand::undo()
 {
     m_d->switchTo(m_d->oldGuides);
 }
 
 void KisChangeGuidesCommand::redo()
 {
     if (m_d->firstRedo) {
         m_d->firstRedo = false;
         return;
     }
     m_d->switchTo(m_d->newGuides);
 }
 
 int KisChangeGuidesCommand::id() const
 {
     return 1863;
 }