File indexing completed on 2024-04-14 03:57:09

 /*
     This file is part of the KDE libraries
     SPDX-FileCopyrightText: 1998 Mark Donohoe <donohoe@kde.org>
     SPDX-FileCopyrightText: 2001 Ellis Whitehead <ellis@kde.org>
     SPDX-FileCopyrightText: 2007 Andreas Hartmetz <ahartmetz@gmail.com>
     SPDX-FileCopyrightText: 2020 David Redondo <kde@david-redondo.de>
 
     SPDX-License-Identifier: LGPL-2.0-or-later
 */
 
 #include "config-xmlgui.h"
 
 #include "kkeysequencewidget.h"
 
 #include "debug.h"
 #include "kactioncollection.h"
 
 #include <QAction>
 #include <QApplication>
 #include <QHBoxLayout>
 #include <QHash>
 #include <QToolButton>
 
 #include <KKeySequenceRecorder>
 #include <KLocalizedString>
 #include <KMessageBox>
 #if HAVE_GLOBALACCEL
 #include <KGlobalAccel>
 #endif
 
 static bool shortcutsConflictWith(const QList<QKeySequence> &shortcuts, const QKeySequence &needle)
 {
     if (needle.isEmpty()) {
         return false;
     }
 
     for (const QKeySequence &sequence : shortcuts) {
         if (sequence.isEmpty()) {
             continue;
         }
 
         if (sequence.matches(needle) != QKeySequence::NoMatch //
             || needle.matches(sequence) != QKeySequence::NoMatch) {
             return true;
         }
     }
 
     return false;
 }
 
 class KKeySequenceWidgetPrivate
 {
 public:
     KKeySequenceWidgetPrivate(KKeySequenceWidget *qq);
 
     void init();
 
     void updateShortcutDisplay();
     void startRecording();
 
     // Conflicts the key sequence @p seq with a current standard shortcut?
     bool conflictWithStandardShortcuts(const QKeySequence &seq);
     // Conflicts the key sequence @p seq with a current local shortcut?
     bool conflictWithLocalShortcuts(const QKeySequence &seq);
     // Conflicts the key sequence @p seq with a current global shortcut?
     bool conflictWithGlobalShortcuts(const QKeySequence &seq);
 
     bool promptStealLocalShortcut(const QList<QAction *> &actions, const QKeySequence &seq);
     bool promptstealStandardShortcut(KStandardShortcut::StandardShortcut std, const QKeySequence &seq);
 
 #if HAVE_GLOBALACCEL
     struct KeyConflictInfo {
         QKeySequence key;
         QList<KGlobalShortcutInfo> shortcutInfo;
     };
     bool promptStealGlobalShortcut(const std::vector<KeyConflictInfo> &shortcuts, const QKeySequence &sequence);
 #endif
     void wontStealShortcut(QAction *item, const QKeySequence &seq);
 
     bool checkAgainstStandardShortcuts() const
     {
         return checkAgainstShortcutTypes & KKeySequenceWidget::StandardShortcuts;
     }
 
     bool checkAgainstGlobalShortcuts() const
     {
         return checkAgainstShortcutTypes & KKeySequenceWidget::GlobalShortcuts;
     }
 
     bool checkAgainstLocalShortcuts() const
     {
         return checkAgainstShortcutTypes & KKeySequenceWidget::LocalShortcuts;
     }
 
     // private slot
     void doneRecording();
 
     // members
     KKeySequenceWidget *const q;
     KKeySequenceRecorder *recorder;
     QHBoxLayout *layout;
     QPushButton *keyButton;
     QToolButton *clearButton;
 
     QKeySequence keySequence;
     QKeySequence oldKeySequence;
     QString componentName;
 
     //! Check the key sequence against KStandardShortcut::find()
     KKeySequenceWidget::ShortcutTypes checkAgainstShortcutTypes;
 
     /**
      * The list of action collections to check against for conflict shortcut
      */
     QList<KActionCollection *> checkActionCollections;
 
     /**
      * The action to steal the shortcut from.
      */
     QList<QAction *> stealActions;
 };
 
 KKeySequenceWidgetPrivate::KKeySequenceWidgetPrivate(KKeySequenceWidget *qq)
     : q(qq)
     , layout(nullptr)
     , keyButton(nullptr)
     , clearButton(nullptr)
     , componentName()
     , checkAgainstShortcutTypes(KKeySequenceWidget::LocalShortcuts | KKeySequenceWidget::GlobalShortcuts)
     , stealActions()
 {
 }
 
 void KKeySequenceWidgetPrivate::init()
 {
     layout = new QHBoxLayout(q);
     layout->setContentsMargins(0, 0, 0, 0);
 
     keyButton = new QPushButton(q);
     keyButton->setFocusPolicy(Qt::StrongFocus);
     keyButton->setIcon(QIcon::fromTheme(QStringLiteral("configure")));
     keyButton->setToolTip(
         i18nc("@info:tooltip",
               "Click on the button, then enter the shortcut like you would in the program.\nExample for Ctrl+A: hold the Ctrl key and press A."));
     layout->addWidget(keyButton);
 
     clearButton = new QToolButton(q);
     layout->addWidget(clearButton);
 
     if (qApp->isLeftToRight()) {
         clearButton->setIcon(QIcon::fromTheme(QStringLiteral("edit-clear-locationbar-rtl")));
     } else {
         clearButton->setIcon(QIcon::fromTheme(QStringLiteral("edit-clear-locationbar-ltr")));
     }
 
     recorder = new KKeySequenceRecorder(q->window()->windowHandle(), q);
     recorder->setModifierlessAllowed(false);
     recorder->setMultiKeyShortcutsAllowed(true);
 
     updateShortcutDisplay();
 }
 
 bool KKeySequenceWidgetPrivate::promptStealLocalShortcut(const QList<QAction *> &actions, const QKeySequence &seq)
 {
     const int listSize = actions.size();
 
     QString title = i18ncp("%1 is the number of conflicts", "Shortcut Conflict", "Shortcut Conflicts", listSize);
 
     QString conflictingShortcuts;
     for (const QAction *action : actions) {
         conflictingShortcuts += i18n("Shortcut '%1' for action '%2'\n",
                                      action->shortcut().toString(QKeySequence::NativeText),
                                      KLocalizedString::removeAcceleratorMarker(action->text()));
     }
     QString message = i18ncp("%1 is the number of ambiguous shortcut clashes (hidden)",
                              "The \"%2\" shortcut is ambiguous with the following shortcut.\n"
                              "Do you want to assign an empty shortcut to this action?\n"
                              "%3",
                              "The \"%2\" shortcut is ambiguous with the following shortcuts.\n"
                              "Do you want to assign an empty shortcut to these actions?\n"
                              "%3",
                              listSize,
                              seq.toString(QKeySequence::NativeText),
                              conflictingShortcuts);
 
     return KMessageBox::warningContinueCancel(q, message, title, KGuiItem(i18nc("@action:button", "Reassign"))) == KMessageBox::Continue;
 }
 
 void KKeySequenceWidgetPrivate::wontStealShortcut(QAction *item, const QKeySequence &seq)
 {
     QString title(i18nc("@title:window", "Shortcut conflict"));
     QString msg(
         i18n("<qt>The '%1' key combination is already used by the <b>%2</b> action.<br>"
              "Please select a different one.</qt>",
              seq.toString(QKeySequence::NativeText),
              KLocalizedString::removeAcceleratorMarker(item->text())));
     KMessageBox::error(q, msg, title);
 }
 
 bool KKeySequenceWidgetPrivate::conflictWithLocalShortcuts(const QKeySequence &keySequence)
 {
     if (!(checkAgainstShortcutTypes & KKeySequenceWidget::LocalShortcuts)) {
         return false;
     }
 
     // Add all the actions from the checkActionCollections list to a single list to
     // be able to process them in a single loop below.
     // Note that this can't be done in setCheckActionCollections(), because we
     // keep pointers to the action collections, and between the call to
     // setCheckActionCollections() and this function some actions might already be
     // removed from the collection again.
     QList<QAction *> allActions;
     for (KActionCollection *collection : std::as_const(checkActionCollections)) {
         allActions += collection->actions();
     }
 
     // Because of multikey shortcuts we can have clashes with many shortcuts.
     //
     // Example 1:
     //
     // Application currently uses 'CTRL-X,a', 'CTRL-X,f' and 'CTRL-X,CTRL-F'
     // and the user wants to use 'CTRL-X'. 'CTRL-X' will only trigger as
     // 'activatedAmbiguously()' for obvious reasons.
     //
     // Example 2:
     //
     // Application currently uses 'CTRL-X'. User wants to use 'CTRL-X,CTRL-F'.
     // This will shadow 'CTRL-X' for the same reason as above.
     //
     // Example 3:
     //
     // Some weird combination of Example 1 and 2 with three shortcuts using
     // 1/2/3 key shortcuts. I think you can imagine.
     QList<QAction *> conflictingActions;
 
     // find conflicting shortcuts with existing actions
     for (QAction *qaction : std::as_const(allActions)) {
         if (shortcutsConflictWith(qaction->shortcuts(), keySequence)) {
             // A conflict with a KAction. If that action is configurable
             // ask the user what to do. If not reject this keySequence.
             if (KActionCollection::isShortcutsConfigurable(qaction)) {
                 conflictingActions.append(qaction);
             } else {
                 wontStealShortcut(qaction, keySequence);
                 return true;
             }
         }
     }
 
     if (conflictingActions.isEmpty()) {
         // No conflicting shortcuts found.
         return false;
     }
 
     if (promptStealLocalShortcut(conflictingActions, keySequence)) {
         stealActions = conflictingActions;
         // Announce that the user agreed
         for (QAction *stealAction : std::as_const(stealActions)) {
             Q_EMIT q->stealShortcut(keySequence, stealAction);
         }
         return false;
     }
     return true;
 }
 
 #if HAVE_GLOBALACCEL
 bool KKeySequenceWidgetPrivate::promptStealGlobalShortcut(const std::vector<KeyConflictInfo> &clashing, const QKeySequence &sequence)
 {
     QString clashingKeys;
     for (const auto &[key, shortcutInfo] : clashing) {
         const QString seqAsString = key.toString();
         for (const KGlobalShortcutInfo &info : shortcutInfo) {
             clashingKeys += i18n("Shortcut '%1' in Application '%2' for action '%3'\n", //
                                  seqAsString,
                                  info.componentFriendlyName(),
                                  info.friendlyName());
         }
     }
     const int hashSize = clashing.size();
 
     QString message = i18ncp("%1 is the number of conflicts (hidden), %2 is the key sequence of the shortcut that is problematic",
                              "The shortcut '%2' conflicts with the following key combination:\n",
                              "The shortcut '%2' conflicts with the following key combinations:\n",
                              hashSize,
                              sequence.toString());
     message += clashingKeys;
 
     QString title = i18ncp("%1 is the number of shortcuts with which there is a conflict",
                            "Conflict with Registered Global Shortcut",
                            "Conflict with Registered Global Shortcuts",
                            hashSize);
 
     return KMessageBox::warningContinueCancel(q, message, title, KGuiItem(i18nc("@action:button", "Reassign"))) == KMessageBox::Continue;
 }
 #endif
 
 bool KKeySequenceWidgetPrivate::conflictWithGlobalShortcuts(const QKeySequence &keySequence)
 {
 #ifdef Q_OS_WIN
     // on windows F12 is reserved by the debugger at all times, so we can't use it for a global shortcut
     if (KKeySequenceWidget::GlobalShortcuts && keySequence.toString().contains(QLatin1String("F12"))) {
         QString title = i18n("Reserved Shortcut");
         QString message = i18n(
             "The F12 key is reserved on Windows, so cannot be used for a global shortcut.\n"
             "Please choose another one.");
 
         KMessageBox::error(q, message, title);
         return false;
     }
 #endif
 #if HAVE_GLOBALACCEL
     if (!(checkAgainstShortcutTypes & KKeySequenceWidget::GlobalShortcuts)) {
         return false;
     }
     // Global shortcuts are on key+modifier shortcuts. They can clash with
     // each of the keys of a multi key shortcut.
     std::vector<KeyConflictInfo> clashing;
     for (int i = 0; i < keySequence.count(); ++i) {
         QKeySequence keys(keySequence[i]);
         if (!KGlobalAccel::isGlobalShortcutAvailable(keySequence, componentName)) {
             clashing.push_back({keySequence, KGlobalAccel::globalShortcutsByKey(keys)});
         }
     }
     if (clashing.empty()) {
         return false;
     }
 
     if (!promptStealGlobalShortcut(clashing, keySequence)) {
         return true;
     }
     // The user approved stealing the shortcut. We have to steal
     // it immediately because KAction::setGlobalShortcut() refuses
     // to set a global shortcut that is already used. There is no
     // error it just silently fails. So be nice because this is
     // most likely the first action that is done in the slot
     // listening to keySequenceChanged().
     KGlobalAccel::stealShortcutSystemwide(keySequence);
     return false;
 #else
     Q_UNUSED(keySequence);
     return false;
 #endif
 }
 
 bool KKeySequenceWidgetPrivate::promptstealStandardShortcut(KStandardShortcut::StandardShortcut std, const QKeySequence &seq)
 {
     QString title = i18nc("@title:window", "Conflict with Standard Application Shortcut");
     QString message = i18n(
         "The '%1' key combination is also used for the standard action "
         "\"%2\" that some applications use.\n"
         "Do you really want to use it as a global shortcut as well?",
         seq.toString(QKeySequence::NativeText),
         KStandardShortcut::label(std));
 
     return KMessageBox::warningContinueCancel(q, message, title, KGuiItem(i18nc("@action:button", "Reassign"))) == KMessageBox::Continue;
 }
 
 bool KKeySequenceWidgetPrivate::conflictWithStandardShortcuts(const QKeySequence &seq)
 {
     if (!(checkAgainstShortcutTypes & KKeySequenceWidget::StandardShortcuts)) {
         return false;
     }
     KStandardShortcut::StandardShortcut ssc = KStandardShortcut::find(seq);
     if (ssc != KStandardShortcut::AccelNone && !promptstealStandardShortcut(ssc, seq)) {
         return true;
     }
     return false;
 }
 
 void KKeySequenceWidgetPrivate::startRecording()
 {
     keyButton->setDown(true);
     recorder->startRecording();
     updateShortcutDisplay();
 }
 
 void KKeySequenceWidgetPrivate::doneRecording()
 {
     keyButton->setDown(false);
     stealActions.clear();
     keyButton->setText(keyButton->text().chopped(strlen(" ...")));
     q->setKeySequence(recorder->currentKeySequence(), KKeySequenceWidget::Validate);
     updateShortcutDisplay();
 }
 
 void KKeySequenceWidgetPrivate::updateShortcutDisplay()
 {
     QString s;
     QKeySequence sequence = recorder->isRecording() ? recorder->currentKeySequence() : keySequence;
     if (!sequence.isEmpty()) {
         s = sequence.toString(QKeySequence::NativeText);
     } else if (recorder->isRecording()) {
         s = i18nc("What the user inputs now will be taken as the new shortcut", "Input");
     } else {
         s = i18nc("No shortcut defined", "None");
     }
 
     if (recorder->isRecording()) {
         // make it clear that input is still going on
         s.append(QLatin1String(" ..."));
     }
 
     s = QLatin1Char(' ') + s + QLatin1Char(' ');
     keyButton->setText(s);
 }
 
 KKeySequenceWidget::KKeySequenceWidget(QWidget *parent)
     : QWidget(parent)
     , d(new KKeySequenceWidgetPrivate(this))
 {
     d->init();
     setFocusProxy(d->keyButton);
     connect(d->keyButton, &QPushButton::clicked, this, &KKeySequenceWidget::captureKeySequence);
     connect(d->clearButton, &QToolButton::clicked, this, &KKeySequenceWidget::clearKeySequence);
 
     connect(d->recorder, &KKeySequenceRecorder::currentKeySequenceChanged, this, [this] {
         d->updateShortcutDisplay();
     });
     connect(d->recorder, &KKeySequenceRecorder::recordingChanged, this, [this] {
         if (!d->recorder->isRecording()) {
             d->doneRecording();
         }
     });
 }
 
 KKeySequenceWidget::~KKeySequenceWidget()
 {
     delete d;
 }
 
 KKeySequenceWidget::ShortcutTypes KKeySequenceWidget::checkForConflictsAgainst() const
 {
     return d->checkAgainstShortcutTypes;
 }
 
 void KKeySequenceWidget::setComponentName(const QString &componentName)
 {
     d->componentName = componentName;
 }
 
 bool KKeySequenceWidget::multiKeyShortcutsAllowed() const
 {
     return d->recorder->multiKeyShortcutsAllowed();
 }
 
 void KKeySequenceWidget::setMultiKeyShortcutsAllowed(bool allowed)
 {
     d->recorder->setMultiKeyShortcutsAllowed(allowed);
 }
 
 void KKeySequenceWidget::setCheckForConflictsAgainst(ShortcutTypes types)
 {
     d->checkAgainstShortcutTypes = types;
 }
 
 void KKeySequenceWidget::setModifierlessAllowed(bool allow)
 {
     d->recorder->setModifierlessAllowed(allow);
 }
 
 bool KKeySequenceWidget::isKeySequenceAvailable(const QKeySequence &keySequence) const
 {
     if (keySequence.isEmpty()) {
         return true;
     }
     return !(d->conflictWithLocalShortcuts(keySequence) //
              || d->conflictWithGlobalShortcuts(keySequence) //
              || d->conflictWithStandardShortcuts(keySequence));
 }
 
 bool KKeySequenceWidget::isModifierlessAllowed()
 {
     return d->recorder->modifierlessAllowed();
 }
 
 void KKeySequenceWidget::setClearButtonShown(bool show)
 {
     d->clearButton->setVisible(show);
 }
 
 void KKeySequenceWidget::setCheckActionCollections(const QList<KActionCollection *> &actionCollections)
 {
     d->checkActionCollections = actionCollections;
 }
 
 // slot
 void KKeySequenceWidget::captureKeySequence()
 {
     d->recorder->setWindow(window()->windowHandle());
     d->recorder->startRecording();
 }
 
 QKeySequence KKeySequenceWidget::keySequence() const
 {
     return d->keySequence;
 }
 
 // slot
 void KKeySequenceWidget::setKeySequence(const QKeySequence &seq, Validation validate)
 {
     if (d->keySequence == seq) {
         return;
     }
     if (validate == Validate && !isKeySequenceAvailable(seq)) {
         return;
     }
     d->keySequence = seq;
     d->updateShortcutDisplay();
     Q_EMIT keySequenceChanged(seq);
 }
 
 // slot
 void KKeySequenceWidget::clearKeySequence()
 {
     setKeySequence(QKeySequence());
 }
 
 // slot
 void KKeySequenceWidget::applyStealShortcut()
 {
     QSet<KActionCollection *> changedCollections;
 
     for (QAction *stealAction : std::as_const(d->stealActions)) {
         // Stealing a shortcut means setting it to an empty one.
         stealAction->setShortcuts(QList<QKeySequence>());
 
         // The following code will find the action we are about to
         // steal from and save it's actioncollection.
         KActionCollection *parentCollection = nullptr;
         for (KActionCollection *collection : std::as_const(d->checkActionCollections)) {
             if (collection->actions().contains(stealAction)) {
                 parentCollection = collection;
                 break;
             }
         }
 
         // Remember the changed collection
         if (parentCollection) {
             changedCollections.insert(parentCollection);
         }
     }
 
     for (KActionCollection *col : std::as_const(changedCollections)) {
         col->writeSettings();
     }
 
     d->stealActions.clear();
 }
 
 bool KKeySequenceWidget::event(QEvent *ev)
 {
     constexpr char _highlight[] = "_kde_highlight_neutral";
 
     if (ev->type() == QEvent::DynamicPropertyChange) {
         auto dpev = static_cast<QDynamicPropertyChangeEvent *>(ev);
         if (dpev->propertyName() == _highlight) {
             d->keyButton->setProperty(_highlight, property(_highlight));
             return true;
         }
     }
 
     return QWidget::event(ev);
 }
 
 #include "moc_kkeysequencewidget.cpp"