CppEditor: Offer InsertDefsOperation quickfix for all classes

The check whether there are unimplemented member functions takes quite
long, so Creator would freeze for several seconds when right-clicking on
the name of even a medium-sized class.
Therefore, we offer the operation for all classes with member functions
and move the expensive check into the perform() method.

Change-Id: Ie19958ba8c53493be859f9982d7d5697e6e9d88b
Reviewed-by: Christian Stenger <christian.stenger@qt.io>

src/plugins/cppeditor/cppquickfix_test.cpp

@@ -3653,6 +3653,23 @@ void CppEditorPlugin::test_quickfix_InsertDefsFromDecls_data()
 
         } // namespace N)";
     QTest::addRow("no candidates")
+            << QByteArrayList{origHeader, origHeader}
+            << QByteArrayList{origSource, origSource}
+            << int(InsertDefsFromDecls::Mode::Alternating);
+
+    origHeader = R"(
+        namespace N {
+        class @C
+        {
+        public:
+            friend void ignoredFriend();
+            void ignoredImplemented() {};
+
+        signals:
+            void ignoredSignal();
+        };
+        } // namespace N)";
+    QTest::addRow("no member functions")
             << QByteArrayList{origHeader, ""}
             << QByteArrayList{origSource, ""}
             << int(InsertDefsFromDecls::Mode::Alternating);

src/plugins/cppeditor/cppquickfixes.cpp

@@ -3479,12 +3479,11 @@ public:
         m_classAST = path.at(path.size() - 2)->asClassSpecifier();
         if (!m_classAST)
             return;
-
         const Class * const theClass = m_classAST->symbol;
         if (!theClass)
             return;
 
-        // Collect all member functions without an implementation.
+        // Collect all member functions.
         for (auto it = theClass->memberBegin(); it != theClass->memberEnd(); ++it) {
             Symbol * const s = *it;
             if (!s->identifier() || !s->type() || !s->isDeclaration() || s->asFunction())
@@ -3492,8 +3491,6 @@ public:
             Function * const func = s->type()->asFunctionType();
             if (!func || func->isSignal() || func->isFriend())
                 continue;
-            if (SymbolFinder().findMatchingDefinition(s, interface.snapshot()))
-                continue;
             m_declarations << s;
         }
     }
@@ -3504,7 +3501,14 @@ public:
 private:
     void perform() override
     {
-        QTC_ASSERT(!m_declarations.isEmpty(), return);
+        QList<Symbol *> unimplemented;
+        SymbolFinder symbolFinder;
+        for (Symbol * const s : qAsConst(m_declarations)) {
+            if (!symbolFinder.findMatchingDefinition(s, snapshot()))
+                unimplemented << s;
+        }
+        if (unimplemented.isEmpty())
+            return;
 
         CppRefactoringChanges refactoring(snapshot());
         const bool isHeaderFile = ProjectFile::isHeader(ProjectFile::classify(filePath().toString()));
@@ -3512,7 +3516,7 @@ private:
         if (isHeaderFile) {
             InsertionPointLocator locator(refactoring);
             for (const InsertionLocation &location
-                 : locator.methodDefinition(m_declarations.first(), false, {})) {
+                 : locator.methodDefinition(unimplemented.first(), false, {})) {
                 if (!location.isValid())
                     continue;
                 const QString fileName = location.fileName();
@@ -3530,7 +3534,7 @@ private:
         MemberFunctionImplSettings settings;
         switch (m_mode) {
         case InsertDefsFromDecls::Mode::User: {
-            AddImplementationsDialog dlg(m_declarations, Utils::FilePath::fromString(cppFile));
+            AddImplementationsDialog dlg(unimplemented, Utils::FilePath::fromString(cppFile));
             if (dlg.exec() == QDialog::Accepted)
                 settings = dlg.settings();
             break;
@@ -3540,7 +3544,7 @@ private:
             const auto incDefPos = [&defPos] {
                 defPos = (defPos + 1) % (DefPosImplementationFile + 2);
             };
-            for (Symbol * const func : qAsConst(m_declarations)) {
+            for (Symbol * const func : qAsConst(unimplemented)) {
                 incDefPos();
                 if (defPos > DefPosImplementationFile)
                     continue;
@@ -3610,8 +3614,8 @@ private:
     }
 
     ClassSpecifierAST *m_classAST = nullptr;
-    QList<Symbol *> m_declarations;
     InsertDefsFromDecls::Mode m_mode;
+    QList<Symbol *> m_declarations;
 };