CppEditor: Add Base Class Support for Generate Constructor QuickFix

Change-Id: Idd92229134609c0ac87aad030a6bb645ff4cce1b
Reviewed-by: Christian Kandeler <christian.kandeler@qt.io>

4 files changed, 558 insertions, 44 deletions

diff --git a/src/libs/3rdparty/cplusplus/Bind.cpp b/src/libs/3rdparty/cplusplus/Bind.cpp
index 5313bd2d91..4fb9427ace 100644
--- a/src/libs/3rdparty/cplusplus/Bind.cpp
+++ b/src/libs/3rdparty/cplusplus/Bind.cpp
@@ -1253,12 +1253,39 @@ const StringLiteral *Bind::asStringLiteral(const AST *ast)
     const int firstToken = ast->firstToken();
     const int lastToken = ast->lastToken();
     std::string buffer;
+
+    const auto token = tokenAt(ast->firstToken());
+
+    if (token.isCharLiteral()) {
+        if (token.kind() == T_WIDE_CHAR_LITERAL)
+            buffer += 'L';
+        else if (token.kind() == T_UTF16_CHAR_LITERAL)
+            buffer += 'u';
+        else if (token.kind() == T_UTF32_CHAR_LITERAL)
+            buffer += 'U';
+        buffer += '\'';
+    } else if (token.isStringLiteral()) {
+        if (token.kind() == T_WIDE_STRING_LITERAL)
+            buffer += 'L';
+        else if (token.kind() == T_UTF16_STRING_LITERAL)
+            buffer += 'u';
+        else if (token.kind() == T_UTF32_STRING_LITERAL)
+            buffer += 'U';
+        else if (token.kind() == T_UTF8_STRING_LITERAL)
+            buffer += "u8";
+        buffer += '"';
+    }
     for (int index = firstToken; index != lastToken; ++index) {
         const Token &tk = tokenAt(index);
         if (index != firstToken && (tk.whitespace() || tk.newline()))
             buffer += ' ';
         buffer += tk.spell();
     }
+    if (token.isCharLiteral())
+        buffer += '\'';
+    else if (token.isStringLiteral())
+        buffer += '"';
+
     return control()->stringLiteral(buffer.c_str(), int(buffer.size()));
 }
 
diff --git a/src/libs/3rdparty/cplusplus/Symbols.h b/src/libs/3rdparty/cplusplus/Symbols.h
index bfb645d1c0..eb926a1b86 100644
--- a/src/libs/3rdparty/cplusplus/Symbols.h
+++ b/src/libs/3rdparty/cplusplus/Symbols.h
@@ -544,6 +544,7 @@ public:
     int baseClassCount() const;
     BaseClass *baseClassAt(int index) const;
     void addBaseClass(BaseClass *baseClass);
+    const std::vector<BaseClass *> &baseClasses() const { return _baseClasses; }
 
     // Symbol's interface
     FullySpecifiedType type() const override;
diff --git a/src/plugins/cppeditor/cppquickfix_test.cpp b/src/plugins/cppeditor/cppquickfix_test.cpp
index e2bc42cf4c..7bfdf5b7ba 100644
--- a/src/plugins/cppeditor/cppquickfix_test.cpp
+++ b/src/plugins/cppeditor/cppquickfix_test.cpp
@@ -7878,6 +7878,75 @@ public:
     QTest::newRow("default parameters")
         << header << expected << QByteArray() << QByteArray() << Inside;
 
+    header = R"--(
+struct Bar{
+    Bar(int i);
+};
+class@ Foo : public Bar{
+    int test;
+public:
+};
+)--";
+    expected = R"--(
+struct Bar{
+    Bar(int i);
+};
+class Foo : public Bar{
+    int test;
+public:
+    Foo(int test, int i) : Bar(i),
+        test(test)
+    {}
+};
+)--";
+    QTest::newRow("parent constructor")
+        << header << expected << QByteArray() << QByteArray() << Inside;
+
+    header = R"--(
+struct Bar{
+    Bar(int use_i = 6);
+};
+class@ Foo : public Bar{
+    int test;
+public:
+};
+)--";
+    expected = R"--(
+struct Bar{
+    Bar(int use_i = 6);
+};
+class Foo : public Bar{
+    int test;
+public:
+    Foo(int test, int use_i = 6) : Bar(use_i),
+        test(test)
+    {}
+};
+)--";
+    QTest::newRow("parent constructor with default")
+        << header << expected << QByteArray() << QByteArray() << Inside;
+
+    header = R"--(
+struct Bar{
+    Bar(int use_i = L'A', int use_i2 = u8"B");
+};
+class@ Foo : public Bar{
+public:
+};
+)--";
+    expected = R"--(
+struct Bar{
+    Bar(int use_i = L'A', int use_i2 = u8"B");
+};
+class Foo : public Bar{
+public:
+    Foo(int use_i = L'A', int use_i2 = u8"B") : Bar(use_i, use_i2)
+    {}
+};
+)--";
+    QTest::newRow("parent constructor with char/string default value")
+        << header << expected << QByteArray() << QByteArray() << Inside;
+
     const QByteArray common = R"--(
 namespace N{
     template<typename T>
diff --git a/src/plugins/cppeditor/cppquickfixes.cpp b/src/plugins/cppeditor/cppquickfixes.cpp
index 84bceab08b..9da58027f3 100644
--- a/src/plugins/cppeditor/cppquickfixes.cpp
+++ b/src/plugins/cppeditor/cppquickfixes.cpp
@@ -67,6 +67,9 @@
 #include <utils/qtcassert.h>
 #include <utils/treemodel.h>
 
+#ifdef WITH_TESTS
+#include <QAbstractItemModelTester>
+#endif
 #include <QApplication>
 #include <QCheckBox>
 #include <QComboBox>
@@ -86,6 +89,7 @@
 #include <QRegularExpression>
 #include <QSharedPointer>
 #include <QStack>
+#include <QStyledItemDelegate>
 #include <QTableView>
 #include <QTextCodec>
 #include <QTextCursor>
@@ -8429,6 +8433,8 @@ void RemoveUsingNamespace::match(const CppQuickFixInterface &interface, QuickFix
 
 namespace {
 
+struct ParentClassConstructorInfo;
+
 class ConstructorMemberInfo
 {
 public:
@@ -8439,7 +8445,20 @@ public:
         , type(symbol->type())
         , numberOfMember(numberOfMember)
     {}
-
+    ConstructorMemberInfo(const QString &memberName,
+                          const QString &paramName,
+                          const QString &defaultValue,
+                          Symbol *symbol,
+                          const ParentClassConstructorInfo *parentClassConstructor)
+        : parentClassConstructor(parentClassConstructor)
+        , memberVariableName(memberName)
+        , parameterName(paramName)
+        , defaultValue(defaultValue)
+        , init(defaultValue.isEmpty())
+        , symbol(symbol)
+        , type(symbol->type())
+    {}
+    const ParentClassConstructorInfo *parentClassConstructor = nullptr;
     QString memberVariableName;
     QString parameterName;
     QString defaultValue;
@@ -8449,12 +8468,12 @@ public:
     FullySpecifiedType type;
     int numberOfMember; // first member, second member, ...
 };
-using ConstructorMemberCandidates = std::vector<ConstructorMemberInfo>;
 
 class ConstructorParams : public QAbstractTableModel
 {
     Q_OBJECT
-    std::vector<ConstructorMemberInfo *> &infos;
+    std::list<ConstructorMemberInfo> candidates;
+    std::vector<ConstructorMemberInfo *> infos;
 
     void validateOrder()
     {
@@ -8474,10 +8493,46 @@ class ConstructorParams : public QAbstractTableModel
 
 public:
     enum Column { ShouldInitColumn, MemberNameColumn, ParameterNameColumn, DefaultValueColumn };
-    ConstructorParams(QObject *parent, std::vector<ConstructorMemberInfo *> &infos)
-        : QAbstractTableModel(parent)
-        , infos(infos)
-    {}
+    template<typename... _Args>
+    void emplaceBackParameter(_Args &&...__args)
+    {
+        candidates.emplace_back(std::forward<_Args>(__args)...);
+        infos.push_back(&candidates.back());
+    }
+    const std::vector<ConstructorMemberInfo *> &getInfos() const { return infos; }
+    void addRow(ConstructorMemberInfo *info)
+    {
+        beginInsertRows({}, rowCount(), rowCount());
+        infos.push_back(info);
+        endInsertRows();
+        validateOrder();
+    }
+    void removeRow(ConstructorMemberInfo *info)
+    {
+        for (auto iter = infos.begin(); iter != infos.end(); ++iter) {
+            if (*iter == info) {
+                const auto index = iter - infos.begin();
+                beginRemoveRows({}, index, index);
+                infos.erase(iter);
+                endRemoveRows();
+                validateOrder();
+                return;
+            }
+        }
+    }
+
+    int selectedCount() const
+    {
+        return Utils::count(infos, [](const ConstructorMemberInfo *mi) {
+            return mi->init && !mi->parentClassConstructor;
+        });
+    }
+    int memberCount() const
+    {
+        return Utils::count(infos, [](const ConstructorMemberInfo *mi) {
+            return !mi->parentClassConstructor;
+        });
+    }
 
     int rowCount(const QModelIndex & /*parent*/ = {}) const override { return infos.size(); }
     int columnCount(const QModelIndex & /*parent*/ = {}) const override { return 4; }
@@ -8485,7 +8540,8 @@ public:
     {
         if (index.row() < 0 || index.row() >= rowCount())
             return {};
-        if (role == Qt::CheckStateRole && index.column() == ShouldInitColumn)
+        if (role == Qt::CheckStateRole && index.column() == ShouldInitColumn
+            && !infos[index.row()]->parentClassConstructor)
             return infos[index.row()]->init ? Qt::Checked : Qt::Unchecked;
         if (role == Qt::DisplayRole && index.column() == MemberNameColumn)
             return infos[index.row()]->memberVariableName;
@@ -8495,15 +8551,17 @@ public:
         if ((role == Qt::DisplayRole || role == Qt::EditRole)
             && index.column() == DefaultValueColumn)
             return infos[index.row()]->defaultValue;
-        if ((role == Qt::ToolTipRole) && index.column() == DefaultValueColumn)
+        if ((role == Qt::ToolTipRole) && index.column() > 0)
             return Overview{}.prettyType(infos[index.row()]->symbol->type());
         return {};
     }
     bool setData(const QModelIndex &index, const QVariant &value, int role) override
     {
         if (index.column() == ShouldInitColumn && role == Qt::CheckStateRole) {
+            if (infos[index.row()]->parentClassConstructor)
+                return false;
             infos[index.row()]->init = value.toInt() == Qt::Checked;
-            emit dataChanged(this->index(index.row(), 1), this->index(index.row(), 2));
+            emit dataChanged(this->index(index.row(), 0), this->index(index.row(), columnCount()));
             validateOrder();
             return true;
         }
@@ -8530,7 +8588,7 @@ public:
             f |= Qt::ItemIsSelectable;
         }
 
-        if (index.column() == ShouldInitColumn)
+        if (index.column() == ShouldInitColumn && !infos[index.row()]->parentClassConstructor)
             return f | Qt::ItemIsEnabled | Qt::ItemIsUserCheckable;
         if (!infos[index.row()]->init)
             return f;
@@ -8597,14 +8655,14 @@ public:
     class TableViewStyle : public QProxyStyle
     {
     public:
-        TableViewStyle(QStyle *style = 0)
+        TableViewStyle(QStyle *style)
             : QProxyStyle(style)
         {}
 
         void drawPrimitive(PrimitiveElement element,
                            const QStyleOption *option,
                            QPainter *painter,
-                           const QWidget *widget = 0) const
+                           const QWidget *widget) const override
         {
             if (element == QStyle::PE_IndicatorItemViewItemDrop && !option->rect.isNull()) {
                 QStyleOption opt(*option);
@@ -8621,23 +8679,250 @@ signals:
     void validOrder(bool valid);
 };
 
+class TopMarginDelegate : public QStyledItemDelegate
+{
+public:
+    TopMarginDelegate(QObject *parent = nullptr)
+        : QStyledItemDelegate(parent)
+    {}
+
+    void paint(QPainter *painter,
+               const QStyleOptionViewItem &option,
+               const QModelIndex &index) const override
+    {
+        Q_ASSERT(index.isValid());
+        QStyleOptionViewItem opt = option;
+        initStyleOption(&opt, index);
+        const QWidget *widget = option.widget;
+        QStyle *style = widget ? widget->style() : QApplication::style();
+        if (opt.rect.height() > 20)
+            opt.rect.adjust(0, 5, 0, 0);
+        style->drawControl(QStyle::CE_ItemViewItem, &opt, painter, widget);
+    }
+};
+
+struct ParentClassConstructorParameter : public ConstructorMemberInfo
+{
+    QString originalDefaultValue;
+    QString declaration; // displayed in the treeView
+    ParentClassConstructorParameter(const QString &name,
+                                    const QString &defaultValue,
+                                    Symbol *symbol,
+                                    const ParentClassConstructorInfo *parentClassConstructor);
+
+    ParentClassConstructorParameter(const ParentClassConstructorParameter &) = delete;
+    ParentClassConstructorParameter(ParentClassConstructorParameter &&) = default;
+};
+
+struct ParentClassConstructorInfo
+{
+    ParentClassConstructorInfo(const QString &name, ConstructorParams &model)
+        : className(name)
+        , model(model)
+    {}
+    bool useInConstructor = false;
+    const QString className;
+    QString declaration;
+    std::vector<ParentClassConstructorParameter> parameters;
+    ConstructorParams &model;
+
+    ParentClassConstructorInfo(const ParentClassConstructorInfo &) = delete;
+    ParentClassConstructorInfo(ParentClassConstructorInfo &&) = default;
+
+    void addParameter(ParentClassConstructorParameter &param) { model.addRow(&param); }
+    void removeParameter(ParentClassConstructorParameter &param) { model.removeRow(&param); }
+    void removeAllParameters()
+    {
+        for (auto &param : parameters)
+            model.removeRow(&param);
+    }
+};
+
+ParentClassConstructorParameter::ParentClassConstructorParameter(
+    const QString &name,
+    const QString &defaultValue,
+    Symbol *symbol,
+    const ParentClassConstructorInfo *parentClassConstructor)
+    : ConstructorMemberInfo(parentClassConstructor->className + "::" + name,
+                            name,
+                            defaultValue,
+                            symbol,
+                            parentClassConstructor)
+    , originalDefaultValue(defaultValue)
+    , declaration(Overview{}.prettyType(symbol->type(), name)
+                  + (defaultValue.isEmpty() ? QString{} : " = " + defaultValue))
+{}
+
+using ParentClassConstructors = std::vector<ParentClassConstructorInfo>;
+
+class ParentClassesModel : public QAbstractItemModel
+{
+    ParentClassConstructors &constructors;
+
+public:
+    ParentClassesModel(QObject *parent, ParentClassConstructors &constructors)
+        : QAbstractItemModel(parent)
+        , constructors(constructors)
+    {}
+    QModelIndex index(int row, int column, const QModelIndex &parent = {}) const override
+    {
+        if (!parent.isValid())
+            return createIndex(row, column, nullptr);
+        if (parent.internalPointer())
+            return {};
+        auto index = createIndex(row, column, &constructors.at(parent.row()));
+        return index;
+    }
+    QModelIndex parent(const QModelIndex &index) const override
+    {
+        if (!index.isValid())
+            return {};
+        auto *parent = static_cast<ParentClassConstructorInfo *>(index.internalPointer());
+        if (!parent)
+            return {};
+        int i = 0;
+        for (const auto &info : constructors) {
+            if (&info == parent)
+                return createIndex(i, 0, nullptr);
+            ++i;
+        }
+        return {};
+    }
+    int rowCount(const QModelIndex &parent = {}) const override
+    {
+        if (!parent.isValid())
+            return static_cast<int>(constructors.size());
+        auto info = static_cast<ParentClassConstructorInfo *>(parent.internalPointer());
+        if (!info)
+            return static_cast<int>(constructors.at(parent.row()).parameters.size());
+        return 0;
+    }
+    int columnCount(const QModelIndex & /*parent*/ = {}) const override { return 1; }
+    QVariant data(const QModelIndex &index, int role) const override
+    {
+        if (!index.isValid())
+            return {};
+        auto info = static_cast<ParentClassConstructorInfo *>(index.internalPointer());
+
+        if (info) {
+            const auto &parameter = info->parameters.at(index.row());
+            if (role == Qt::CheckStateRole)
+                return parameter.init ? Qt::Checked : Qt::Unchecked;
+            if (role == Qt::DisplayRole)
+                return parameter.declaration;
+            return {};
+        }
+        const auto &constructor = constructors.at(index.row());
+        if (role == Qt::CheckStateRole)
+            return constructor.useInConstructor ? Qt::PartiallyChecked : Qt::Unchecked;
+        if (role == Qt::DisplayRole)
+            return constructor.declaration;
+
+        // Highlight the selected items
+        if (role == Qt::FontRole && constructor.useInConstructor) {
+            QFont font = QApplication::font();
+            font.setBold(true);
+            return font;
+        }
+        // Create a margin between sets of constructors for base classes
+        if (role == Qt::SizeHintRole && index.row() > 0
+            && constructor.className != constructors.at(index.row() - 1).className) {
+            return QSize(-1, 25);
+        }
+        return {};
+    }
+    bool setData(const QModelIndex &index, const QVariant &value, int /*role*/) override
+    {
+        if (index.isValid() && index.column() == 0) {
+            auto info = static_cast<ParentClassConstructorInfo *>(index.internalPointer());
+            if (info) {
+                const bool nowUse = value.toBool();
+                auto &param = info->parameters.at(index.row());
+                param.init = nowUse;
+                if (nowUse)
+                    info->addParameter(param);
+                else
+                    info->removeParameter(param);
+                return true;
+            }
+            auto &newConstructor = constructors.at(index.row());
+            // You have to select a base class constructor
+            if (newConstructor.useInConstructor)
+                return false;
+            auto c = std::find_if(constructors.begin(), constructors.end(), [&](const auto &c) {
+                return c.className == newConstructor.className && c.useInConstructor;
+            });
+            QTC_ASSERT(c == constructors.end(), return false;);
+            c->useInConstructor = false;
+            newConstructor.useInConstructor = true;
+            emit dataChanged(this->index(index.row(), 0), this->index(index.row(), columnCount()));
+            auto parentIndex = this->index(index.row(), 0);
+            emit dataChanged(this->index(0, 0, parentIndex),
+                             this->index(rowCount(parentIndex), columnCount()));
+            const int oldIndex = c - constructors.begin();
+            emit dataChanged(this->index(oldIndex, 0), this->index(oldIndex, columnCount()));
+            parentIndex = this->index(oldIndex, 0);
+            emit dataChanged(this->index(0, 0, parentIndex),
+                             this->index(rowCount(parentIndex), columnCount()));
+            // update other table
+            c->removeAllParameters();
+            for (auto &p : newConstructor.parameters)
+                if (p.init)
+                    newConstructor.addParameter(p);
+            return true;
+        }
+        return false;
+    }
+    QVariant headerData(int section, Qt::Orientation orientation, int role) const override
+    {
+        if (orientation == Qt::Horizontal && role == Qt::DisplayRole) {
+            switch (section) {
+            case 0:
+                return tr("Base Class Constructors");
+            }
+        }
+        return {};
+    }
+    Qt::ItemFlags flags(const QModelIndex &index) const override
+    {
+        if (index.isValid()) {
+            Qt::ItemFlags f;
+            auto info = static_cast<ParentClassConstructorInfo *>(index.internalPointer());
+            if (!info || info->useInConstructor) {
+                f |= Qt::ItemIsEnabled;
+            }
+            f |= Qt::ItemIsUserCheckable;
+
+            return f;
+        }
+        return {};
+    }
+};
+
 class GenerateConstructorDialog : public QDialog
 {
     Q_DECLARE_TR_FUNCTIONS(GenerateConstructorDialog)
 public:
-    GenerateConstructorDialog(std::vector<ConstructorMemberInfo *> &candidates)
-        : QDialog()
+    GenerateConstructorDialog(ConstructorParams *constructorParamsModel,
+                              ParentClassConstructors &constructors)
     {
         setWindowTitle(tr("Constructor"));
-        const auto model = new ConstructorParams(this, candidates);
+
+        const auto treeModel = new ParentClassesModel(this, constructors);
+        const auto treeView = new QTreeView(this);
+        treeView->setModel(treeModel);
+        treeView->setItemDelegate(new TopMarginDelegate(this));
+        treeView->expandAll();
+
         const auto view = new QTableView(this);
-        view->setModel(model);
+        view->setModel(constructorParamsModel);
         int optimalWidth = 0;
-        for (int i = 0; i < model->columnCount(QModelIndex{}); ++i) {
+        for (int i = 0; i < constructorParamsModel->columnCount(QModelIndex{}); ++i) {
             view->resizeColumnToContents(i);
             optimalWidth += view->columnWidth(i);
         }
         view->resizeRowsToContents();
+        view->verticalHeader()->setDefaultSectionSize(view->rowHeight(0));
         view->setSelectionBehavior(QAbstractItemView::SelectRows);
         view->setSelectionMode(QAbstractItemView::SingleSelection);
         view->setDragEnabled(true);
@@ -8659,7 +8944,7 @@ public:
         QSizePolicy labelSizePolicy = errorLabel->sizePolicy();
         labelSizePolicy.setRetainSizeWhenHidden(true);
         errorLabel->setSizePolicy(labelSizePolicy);
-        connect(model,
+        connect(constructorParamsModel,
                 &ConstructorParams::validOrder,
                 [=, button = buttonBox->button(QDialogButtonBox::Ok)](bool valid) {
                     button->setEnabled(valid);
@@ -8669,7 +8954,7 @@ public:
         // setup select all/none checkbox
         QCheckBox *const checkBox = new QCheckBox(tr("Initialize all members"));
         checkBox->setChecked(true);
-        connect(checkBox, &QCheckBox::stateChanged, [model](int state) {
+        connect(checkBox, &QCheckBox::stateChanged, [model = constructorParamsModel](int state) {
             if (state != Qt::PartiallyChecked) {
                 for (int i = 0; i < model->rowCount(); ++i)
                     model->setData(model->index(i, ConstructorParams::ShouldInitColumn),
@@ -8681,20 +8966,19 @@ public:
             if (checkBox->checkState() == Qt::PartiallyChecked)
                 checkBox->setCheckState(Qt::Checked);
         });
-        connect(model, &QAbstractItemModel::dataChanged, this, [&candidates, checkBox] {
-            const auto selectedCount = Utils::count(candidates, [](const ConstructorMemberInfo *mi) {
-                return mi->init;
-            });
-
-            const auto state = [&candidates, selectedCount]() {
-                if (selectedCount == 0)
-                    return Qt::Unchecked;
-                if (static_cast<int>(candidates.size()) == selectedCount)
-                    return Qt::Checked;
-                return Qt::PartiallyChecked;
-            }();
-            checkBox->setCheckState(state);
-        });
+        connect(constructorParamsModel,
+                &QAbstractItemModel::dataChanged,
+                this,
+                [model = constructorParamsModel, checkBox] {
+                    const auto state = [model, selectedCount = model->selectedCount()]() {
+                        if (selectedCount == 0)
+                            return Qt::Unchecked;
+                        if (static_cast<int>(model->memberCount() == selectedCount))
+                            return Qt::Checked;
+                        return Qt::PartiallyChecked;
+                    }();
+                    checkBox->setCheckState(state);
+                });
 
         using A = InsertionPointLocator::AccessSpec;
         auto accessCombo = new QComboBox;
@@ -8716,6 +9000,7 @@ public:
         mainLayout->addLayout(row);
         mainLayout->addWidget(checkBox);
         mainLayout->addWidget(view);
+        mainLayout->addWidget(treeView);
         mainLayout->addWidget(errorLabel);
         mainLayout->addWidget(buttonBox);
         int left, right;
@@ -8756,29 +9041,108 @@ public:
             if (s->isDeclaration() && (s->isPrivate() || s->isProtected()) && !s->isStatic()) {
                 const auto name = QString::fromUtf8(s->identifier()->chars(),
                                                     s->identifier()->size());
-                m_candidates.emplace_back(name, s, memberCounter++);
+                parameterModel.emplaceBackParameter(name, s, memberCounter++);
+            }
+        }
+        Overview o = CppCodeStyleSettings::currentProjectCodeStyleOverview();
+        o.showArgumentNames = true;
+        o.showReturnTypes = true;
+        o.showDefaultArguments = true;
+        o.showTemplateParameters = true;
+        o.showFunctionSignatures = true;
+        LookupContext context(currentFile()->cppDocument(), interface.snapshot());
+        for (BaseClass *bc : theClass->baseClasses()) {
+            const QString className = o.prettyName(bc->name());
+
+            ClassOrNamespace *localLookupType = context.lookupType(bc);
+            QList<LookupItem> localLookup = localLookupType->lookup(bc->name());
+            for (auto &li : localLookup) {
+                Symbol *d = li.declaration();
+                if (!d->asClass())
+                    continue;
+                for (auto i = d->asClass()->memberBegin(); i != d->asClass()->memberEnd(); ++i) {
+                    Symbol *s = *i;
+                    if (s->isProtected() || s->isPublic()) {
+                        if (s->name()->match(d->name())) {
+                            // we have found a constructor
+                            Function *func = s->type().type()->asFunctionType();
+                            if (!func)
+                                continue;
+                            const bool isFirst = parentClassConstructors.empty()
+                                                 || parentClassConstructors.back().className
+                                                        != className;
+                            parentClassConstructors.emplace_back(className, parameterModel);
+                            ParentClassConstructorInfo &constructor = parentClassConstructors.back();
+                            constructor.declaration = className + o.prettyType(func->type());
+                            constructor.declaration.replace("std::__1::__get_nullptr_t()",
+                                                            "nullptr");
+                            constructor.useInConstructor = isFirst;
+                            for (auto arg = func->memberBegin(); arg != func->memberEnd(); ++arg) {
+                                Symbol *param = *arg;
+                                Argument *argument = param->asArgument();
+                                if (!argument) // can also be a block
+                                    continue;
+                                const QString name = o.prettyName(param->name());
+                                const StringLiteral *ini = argument->initializer();
+                                QString defaultValue;
+                                if (ini)
+                                    defaultValue = QString::fromUtf8(ini->chars(), ini->size())
+                                                       .replace("std::__1::__get_nullptr_t()",
+                                                                "nullptr");
+                                constructor.parameters.emplace_back(name,
+                                                                    defaultValue,
+                                                                    param,
+                                                                    &constructor);
+                                // do not show constructors like QObject(QObjectPrivate & dd, ...)
+                                ReferenceType *ref = param->type()->asReferenceType();
+                                if (ref && name == "dd") {
+                                    auto type = o.prettyType(ref->elementType());
+                                    if (type.startsWith("Q") && type.endsWith("Private")) {
+                                        parentClassConstructors.pop_back();
+                                        break;
+                                    }
+                                }
+                            }
+                        }
+                    }
+                }
             }
         }
+
+        // add params to parameter lists
+        for (auto &c : parentClassConstructors)
+            if (c.useInConstructor)
+                for (auto &p : c.parameters)
+                    if (p.init)
+                        c.addParameter(p);
     }
 
-    bool isApplicable() const { return !m_candidates.empty(); }
+    bool isApplicable() const
+    {
+        return parameterModel.rowCount() > 0
+               || Utils::anyOf(parentClassConstructors,
+                               [](const auto &parent) { return !parent.parameters.empty(); });
+    }
 
     void setTest(bool isTest = true) { m_test = isTest; }
 
 private:
     void perform() override
     {
-        std::vector<ConstructorMemberInfo *> infos;
-        for (auto &info : m_candidates)
-            infos.push_back(&info);
+        auto infos = parameterModel.getInfos();
 
         InsertionPointLocator::AccessSpec accessSpec = InsertionPointLocator::Public;
         if (!m_test) {
-            GenerateConstructorDialog dlg(infos);
+            GenerateConstructorDialog dlg(&parameterModel, parentClassConstructors);
             if (dlg.exec() == QDialog::Rejected)
                 return;
             accessSpec = dlg.accessSpec();
+            infos = parameterModel.getInfos();
         } else {
+#ifdef WITH_TESTS
+            ParentClassesModel model(nullptr, parentClassConstructors);
+            QAbstractItemModelTester tester(&model);
+#endif
             if (infos.size() >= 3) {
                 // if we are testing and have 3 or more members => change the order
                 // move first element to the back
@@ -8789,6 +9153,16 @@ private:
                 if (info->memberVariableName.startsWith("di_"))
                     info->defaultValue = "42";
             }
+            for (auto &c : parentClassConstructors) {
+                if (c.useInConstructor) {
+                    for (auto &p : c.parameters) {
+                        if (!p.init && p.parameterName.startsWith("use_")) {
+                            infos.push_back(&p);
+                            p.init = true;
+                        }
+                    }
+                }
+            }
         }
         if (infos.empty())
             return;
@@ -8805,7 +9179,8 @@ private:
                 , m_classAST(classAST)
                 , m_accessSpec(accessSpec)
             {}
-            void generateConstructor(std::vector<ConstructorMemberInfo *> members)
+            void generateConstructor(std::vector<ConstructorMemberInfo *> members,
+                                     const ParentClassConstructors &parentClassConstructors)
             {
                 auto constructorLocation = m_settings->determineSetterLocation(members.size());
                 if (constructorLocation == CppQuickFixSettings::FunctionLocation::CppFile
@@ -8865,7 +9240,46 @@ private:
                     }
                 }
                 Utils::sort(members, &ConstructorMemberInfo::numberOfMember);
+                // first, do the base classes
+                for (const auto &parent : parentClassConstructors) {
+                    if (!parent.useInConstructor)
+                        continue;
+                    // Check if we really need a constructor
+                    if (Utils::anyOf(parent.parameters, [](const auto &param) {
+                            return param.init || param.originalDefaultValue.isEmpty();
+                        })) {
+                        int defaultAtEndCount = 0;
+                        for (auto i = parent.parameters.crbegin(); i != parent.parameters.crend();
+                             ++i) {
+                            if (i->init || i->originalDefaultValue.isEmpty())
+                                break;
+                            ++defaultAtEndCount;
+                        }
+                        const int numberOfParameters = static_cast<int>(parent.parameters.size())
+                                                       - defaultAtEndCount;
+                        constructorBody += parent.className + "(";
+                        int counter = 0;
+                        for (const auto &param : parent.parameters) {
+                            if (++counter > numberOfParameters)
+                                break;
+                            if (param.init) {
+                                if (param.customValueType)
+                                    constructorBody += "std::move(" + param.parameterName + ')';
+                                else
+                                    constructorBody += param.parameterName;
+                            } else if (!param.originalDefaultValue.isEmpty())
+                                constructorBody += param.originalDefaultValue;
+                            else
+                                constructorBody += "/* insert value */";
+                            constructorBody += ", ";
+                        }
+                        constructorBody.resize(constructorBody.length() - 2);
+                        constructorBody += "),\n";
+                    }
+                }
                 for (auto &member : members) {
+                    if (member->parentClassConstructor)
+                        continue;
                     QString param = member->parameterName;
                     if (member->customValueType)
                         param = "std::move(" + member->parameterName + ')';
@@ -8909,12 +9323,15 @@ private:
                                                     m_classAST,
                                                     accessSpec);
 
-        auto members = Utils::filtered(infos, [](const auto mi) { return mi->init; });
-        helper.generateConstructor(std::move(members));
+        auto members = Utils::filtered(infos, [](const auto mi) {
+            return mi->init || mi->parentClassConstructor;
+        });
+        helper.generateConstructor(std::move(members), parentClassConstructors);
         helper.applyChanges();
     }
 
-    ConstructorMemberCandidates m_candidates;
+    ConstructorParams parameterModel;
+    ParentClassConstructors parentClassConstructors;
     const ClassSpecifierAST *m_classAST = nullptr;
     bool m_test = false;
 };