File indexing completed on 2024-06-23 05:16:27

 /*
   This file is part of libkdepim.
 
   SPDX-FileCopyrightText: 2008 Thomas Thrainer <tom_t@gmx.at>
   SPDX-FileCopyrightText: 2010 Bertjan Broeksema <broeksema@kde.org>
 
   SPDX-License-Identifier: GPL-2.0-or-later WITH Qt-Commercial-exception-1.0
 */
 
 #include "kcheckcombobox.h"
 
 #include "libkdepim_debug.h"
 
 #include <QAbstractItemView>
 #include <QKeyEvent>
 #include <QLineEdit>
 #include <QStandardItemModel>
 
 using namespace KPIM;
 
 /// Class KCheckComboBox::KCheckComboBoxPrivate
 
 namespace KPIM
 {
 class Q_DECL_HIDDEN KCheckComboBox::KCheckComboBoxPrivate
 {
 public:
     KCheckComboBoxPrivate(KCheckComboBox *qq)
         : mSeparator(QLatin1Char(','))
         , q(qq)
     {
     }
 
     void makeInsertedItemsCheckable(const QModelIndex &, int start, int end);
     [[nodiscard]] QString squeeze(const QString &text);
     void updateCheckedItems(const QModelIndex &topLeft = QModelIndex(), const QModelIndex &bottomRight = QModelIndex(), int role = Qt::DisplayRole);
     void toggleCheckState();
 
 public:
     QString mSeparator;
     QString mDefaultText;
     bool mSqueezeText = false;
     bool mIgnoreHide = false;
     bool mAlwaysShowDefaultText = false;
 
 private:
     KCheckComboBox *const q;
 };
 }
 
 void KCheckComboBox::KCheckComboBoxPrivate::makeInsertedItemsCheckable(const QModelIndex &parent, int start, int end)
 {
     Q_UNUSED(parent)
     auto model = qobject_cast<QStandardItemModel *>(q->model());
     if (model) {
         for (int r = start; r <= end; ++r) {
             QStandardItem *item = model->item(r, 0);
             item->setCheckable(true);
         }
     } else {
         qCWarning(LIBKDEPIM_LOG) << "KCheckComboBox: model is not a QStandardItemModel but a" << q->model() << ". Cannot proceed.";
     }
 }
 
 QString KCheckComboBox::KCheckComboBoxPrivate::squeeze(const QString &text)
 {
     QFontMetrics fm(q->fontMetrics());
     // The 4 pixels is 2 * horizontalMargin from QLineEdit.
     // The rest is code from QLineEdit::paintEvent, where it determines whether to scroll the text
     // (on my machine minLB=2 and minRB=2, so this removes 8 pixels in total)
     const int minLB = qMax(0, -fm.minLeftBearing());
     const int minRB = qMax(0, -fm.minRightBearing());
     const int lineEditWidth = q->lineEdit()->width() - 4 - minLB - minRB;
     const int textWidth = fm.boundingRect(text).width();
     if (textWidth > lineEditWidth) {
         return fm.elidedText(text, Qt::ElideMiddle, lineEditWidth);
     }
 
     return text;
 }
 
 void KCheckComboBox::KCheckComboBoxPrivate::updateCheckedItems(const QModelIndex &topLeft, const QModelIndex &bottomRight, int role)
 {
     Q_UNUSED(topLeft)
     Q_UNUSED(bottomRight)
 
     const QStringList items = q->checkedItems(role);
     QString text;
     if (items.isEmpty() || mAlwaysShowDefaultText) {
         text = mDefaultText;
     } else {
         text = items.join(mSeparator);
     }
 
     if (mSqueezeText) {
         text = squeeze(text);
     }
 
     q->lineEdit()->setText(text);
 
     Q_EMIT q->checkedItemsChanged(items);
 }
 
 void KCheckComboBox::KCheckComboBoxPrivate::toggleCheckState()
 {
     int selected = q->currentIndex();
     if (q->view()->isVisible() && q->itemEnabled(selected)) {
         const QModelIndex index = q->view()->currentIndex().siblingAtRow(selected);
         const QVariant value = index.data(Qt::CheckStateRole);
         if (value.isValid()) {
             const auto state = static_cast<Qt::CheckState>(value.toInt());
             q->model()->setData(index, state == Qt::Unchecked ? Qt::Checked : Qt::Unchecked, Qt::CheckStateRole);
         }
     }
 }
 
 /// Class KCheckComboBox
 
 KCheckComboBox::KCheckComboBox(QWidget *parent)
     : QComboBox(parent)
     , d(new KCheckComboBox::KCheckComboBoxPrivate(this))
 {
     connect(this, &QComboBox::activated, this, [this]() {
         d->toggleCheckState();
     });
     connect(model(), &QAbstractItemModel::rowsInserted, this, [this](const QModelIndex &index, int start, int end) {
         d->makeInsertedItemsCheckable(index, start, end);
     });
     connect(model(), &QAbstractItemModel::dataChanged, this, [this](const QModelIndex &topLeft, const QModelIndex &bottomRight) {
         d->updateCheckedItems(topLeft, bottomRight);
     });
 
     // read-only contents
     setEditable(true);
 
     lineEdit()->setAlignment(Qt::AlignLeft);
     connect(lineEdit(), &QLineEdit::textChanged, this, [this](const QString &text) {
         if (text.isEmpty()) {
             // Clear checked items
             setCheckedItems(QStringList());
         }
     });
 
     view()->installEventFilter(this);
     view()->viewport()->installEventFilter(this);
 
     lineEdit()->installEventFilter(this);
 
     d->updateCheckedItems();
 }
 
 KCheckComboBox::~KCheckComboBox() = default;
 
 void KCheckComboBox::hidePopup()
 {
     if (!d->mIgnoreHide) {
         QComboBox::hidePopup();
     }
     d->mIgnoreHide = false;
 }
 
 Qt::CheckState KCheckComboBox::itemCheckState(int index) const
 {
     return static_cast<Qt::CheckState>(itemData(index, Qt::CheckStateRole).toInt());
 }
 
 void KCheckComboBox::setItemCheckState(int index, Qt::CheckState state)
 {
     setItemData(index, state, Qt::CheckStateRole);
 }
 
 QStringList KCheckComboBox::checkedItems(int role) const
 {
     QStringList items;
     if (model()) {
         const QModelIndex index = model()->index(0, modelColumn(), rootModelIndex());
         const QModelIndexList indexes = model()->match(index, Qt::CheckStateRole, Qt::Checked, -1, Qt::MatchExactly);
         items.reserve(indexes.count());
         for (const QModelIndex &index : indexes) {
             items += index.data(role).toString();
         }
     }
     return items;
 }
 
 void KCheckComboBox::setCheckedItems(const QStringList &items, int role)
 {
     for (int r = 0; r < model()->rowCount(rootModelIndex()); ++r) {
         const QModelIndex indx = model()->index(r, modelColumn(), rootModelIndex());
 
         const QString text = indx.data(role).toString();
         const bool found = items.contains(text);
         model()->setData(indx, found ? Qt::Checked : Qt::Unchecked, Qt::CheckStateRole);
     }
     d->updateCheckedItems(QModelIndex(), QModelIndex(), role);
 }
 
 QString KCheckComboBox::defaultText() const
 {
     return d->mDefaultText;
 }
 
 void KCheckComboBox::setDefaultText(const QString &text)
 {
     if (d->mDefaultText != text) {
         d->mDefaultText = text;
         d->updateCheckedItems();
     }
 }
 
 bool KCheckComboBox::squeezeText() const
 {
     return d->mSqueezeText;
 }
 
 void KCheckComboBox::setSqueezeText(bool squeeze)
 {
     if (d->mSqueezeText != squeeze) {
         d->mSqueezeText = squeeze;
         d->updateCheckedItems();
     }
 }
 
 bool KCheckComboBox::itemEnabled(int index)
 {
     Q_ASSERT(index >= 0 && index <= count());
 
     auto itemModel = qobject_cast<QStandardItemModel *>(model());
     Q_ASSERT(itemModel);
 
     QStandardItem *item = itemModel->item(index, 0);
     return item->isEnabled();
 }
 
 void KCheckComboBox::setItemEnabled(int index, bool enabled)
 {
     Q_ASSERT(index >= 0 && index <= count());
 
     auto itemModel = qobject_cast<QStandardItemModel *>(model());
     Q_ASSERT(itemModel);
 
     QStandardItem *item = itemModel->item(index, 0);
     item->setEnabled(enabled);
 }
 
 QString KCheckComboBox::separator() const
 {
     return d->mSeparator;
 }
 
 void KCheckComboBox::setSeparator(const QString &separator)
 {
     if (d->mSeparator != separator) {
         d->mSeparator = separator;
         d->updateCheckedItems();
     }
 }
 
 void KCheckComboBox::keyPressEvent(QKeyEvent *event)
 {
     switch (event->key()) {
     case Qt::Key_Up:
     case Qt::Key_Down:
         showPopup();
         event->accept();
         break;
     case Qt::Key_Return:
     case Qt::Key_Enter:
     case Qt::Key_Escape:
         hidePopup();
         event->accept();
         break;
     default:
         break;
     }
     // don't call base class implementation, we don't need all that stuff in there
 }
 
 #ifndef QT_NO_WHEELEVENT
 void KCheckComboBox::wheelEvent(QWheelEvent *event)
 {
     // discard mouse wheel events on the combo box
     event->accept();
 }
 
 #endif
 
 void KCheckComboBox::resizeEvent(QResizeEvent *event)
 {
     QComboBox::resizeEvent(event);
     if (d->mSqueezeText) {
         d->updateCheckedItems();
     }
 }
 
 bool KCheckComboBox::eventFilter(QObject *receiver, QEvent *event)
 {
     switch (event->type()) {
     case QEvent::KeyPress:
     case QEvent::KeyRelease:
     case QEvent::ShortcutOverride:
         switch (static_cast<QKeyEvent *>(event)->key()) {
         case Qt::Key_Space:
             if (event->type() == QEvent::KeyPress && view()->isVisible()) {
                 d->toggleCheckState();
             }
             // Always eat the event: don't let QItemDelegate toggle the current index when the view is hidden.
             return true;
         case Qt::Key_Return:
         case Qt::Key_Enter:
         case Qt::Key_Escape:
             // ignore Enter keys, they would normally select items.
             // but we select with Space, because multiple selection is possible
             // we simply close the popup on Enter/Escape
             hidePopup();
             return true;
         }
         break;
     case QEvent::MouseButtonDblClick:
     case QEvent::MouseButtonPress:
     case QEvent::MouseButtonRelease:
         d->mIgnoreHide = true;
         if (receiver == lineEdit()) {
             showPopup();
             return true;
         }
         break;
     default:
         break;
     }
     return QComboBox::eventFilter(receiver, event);
 }
 
 bool KCheckComboBox::alwaysShowDefaultText() const
 {
     return d->mAlwaysShowDefaultText;
 }
 
 void KCheckComboBox::setAlwaysShowDefaultText(bool always)
 {
     if (always != d->mAlwaysShowDefaultText) {
         d->mAlwaysShowDefaultText = always;
         d->updateCheckedItems();
     }
 }
 
 #include "moc_kcheckcombobox.cpp"