ProjectNodes: Handle supported actions one-by-one

Getting the full list for a node can get quite expensive e.g. in
cases of recursive calls of QMakeProjectManager::findPriFile.

However, the FlatModel needs to decide quickly on whether an item
is editable to potentially allow renaming.

So split up QList<Actions> supportedActions() into individual
bool supportsAction(action) calls and make sure Rename is not
on the critical path.

Task-number: QTCREATORBUG-17953
Change-Id: I31841847f8aa7d7b94c63d76ce71efb1c930fa69
Reviewed-by: Tobias Hunger <tobias.hunger@qt.io>

24 files changed, 162 insertions, 211 deletions

diff --git a/src/plugins/autotoolsprojectmanager/autotoolsprojectnode.cpp b/src/plugins/autotoolsprojectmanager/autotoolsprojectnode.cpp
index e98246ed52..793d63a762 100644
--- a/src/plugins/autotoolsprojectmanager/autotoolsprojectnode.cpp
+++ b/src/plugins/autotoolsprojectmanager/autotoolsprojectnode.cpp
@@ -42,9 +42,3 @@ bool AutotoolsProjectNode::showInSimpleTree() const
 {
     return true;
 }
-
-QList<ProjectAction> AutotoolsProjectNode::supportedActions(Node *node) const
-{
-    Q_UNUSED(node);
-    return QList<ProjectAction>();
-}
diff --git a/src/plugins/autotoolsprojectmanager/autotoolsprojectnode.h b/src/plugins/autotoolsprojectmanager/autotoolsprojectnode.h
index 088e007a4a..a60479eb8c 100644
--- a/src/plugins/autotoolsprojectmanager/autotoolsprojectnode.h
+++ b/src/plugins/autotoolsprojectmanager/autotoolsprojectnode.h
@@ -51,7 +51,6 @@ public:
     AutotoolsProjectNode(const Utils::FileName &projectDirectory);
 
     bool showInSimpleTree() const override;
-    QList<ProjectExplorer::ProjectAction> supportedActions(Node *node) const override;
 };
 
 } // namespace Internal
diff --git a/src/plugins/cmakeprojectmanager/cmakeprojectnodes.cpp b/src/plugins/cmakeprojectmanager/cmakeprojectnodes.cpp
index 21b491e299..79337e0440 100644
--- a/src/plugins/cmakeprojectmanager/cmakeprojectnodes.cpp
+++ b/src/plugins/cmakeprojectmanager/cmakeprojectnodes.cpp
@@ -56,12 +56,6 @@ bool CMakeInputsNode::showInSimpleTree() const
     return false;
 }
 
-QList<ProjectExplorer::ProjectAction> CMakeInputsNode::supportedActions(ProjectExplorer::Node *node) const
-{
-    Q_UNUSED(node);
-    return QList<ProjectExplorer::ProjectAction>();
-}
-
 CMakeListsNode::CMakeListsNode(const Utils::FileName &cmakeListPath) :
     ProjectExplorer::ProjectNode(cmakeListPath)
 {
@@ -80,12 +74,6 @@ bool CMakeListsNode::showInSimpleTree() const
     return false;
 }
 
-QList<ProjectExplorer::ProjectAction> CMakeListsNode::supportedActions(ProjectExplorer::Node *node) const
-{
-    Q_UNUSED(node);
-    return QList<ProjectExplorer::ProjectAction>();
-}
-
 CMakeProjectNode::CMakeProjectNode(const Utils::FileName &directory) :
     ProjectExplorer::ProjectNode(directory)
 {
@@ -103,12 +91,6 @@ QString CMakeProjectNode::tooltip() const
     return QString();
 }
 
-QList<ProjectExplorer::ProjectAction> CMakeProjectNode::supportedActions(ProjectExplorer::Node *node) const
-{
-    Q_UNUSED(node);
-    return QList<ProjectExplorer::ProjectAction>();
-}
-
 CMakeTargetNode::CMakeTargetNode(const Utils::FileName &directory) :
     ProjectExplorer::ProjectNode(directory)
 {
@@ -126,12 +108,6 @@ QString CMakeTargetNode::tooltip() const
     return m_tooltip;
 }
 
-QList<ProjectExplorer::ProjectAction> CMakeTargetNode::supportedActions(ProjectExplorer::Node *node) const
-{
-    Q_UNUSED(node);
-    return QList<ProjectExplorer::ProjectAction>();
-}
-
 void CMakeTargetNode::setTargetInformation(const QList<Utils::FileName> &artifacts,
                                            const QString &type)
 {
diff --git a/src/plugins/cmakeprojectmanager/cmakeprojectnodes.h b/src/plugins/cmakeprojectmanager/cmakeprojectnodes.h
index ca1fedd6e8..d4160c7762 100644
--- a/src/plugins/cmakeprojectmanager/cmakeprojectnodes.h
+++ b/src/plugins/cmakeprojectmanager/cmakeprojectnodes.h
@@ -28,8 +28,6 @@
 #include <projectexplorer/projectnodes.h>
 
 namespace CMakeProjectManager {
-class CMakeProject;
-
 namespace Internal {
 
 class CMakeInputsNode : public ProjectExplorer::ProjectNode
@@ -40,7 +38,6 @@ public:
     static Utils::FileName inputsPathFromCMakeListsPath(const Utils::FileName &cmakeLists);
 
     bool showInSimpleTree() const final;
-    QList<ProjectExplorer::ProjectAction> supportedActions(Node *node) const final;
 };
 
 class CMakeListsNode : public ProjectExplorer::ProjectNode
@@ -49,7 +46,6 @@ public:
     CMakeListsNode(const Utils::FileName &cmakeListPath);
 
     bool showInSimpleTree() const final;
-    QList<ProjectExplorer::ProjectAction> supportedActions(Node *node) const final;
 };
 
 class CMakeProjectNode : public ProjectExplorer::ProjectNode
@@ -59,7 +55,6 @@ public:
 
     bool showInSimpleTree() const final;
     QString tooltip() const final;
-    QList<ProjectExplorer::ProjectAction> supportedActions(Node *node) const final;
 };
 
 class CMakeTargetNode : public ProjectExplorer::ProjectNode
@@ -71,7 +66,6 @@ public:
 
     bool showInSimpleTree() const final;
     QString tooltip() const final;
-    QList<ProjectExplorer::ProjectAction> supportedActions(Node *node) const final;
 
 private:
     QString m_tooltip;
diff --git a/src/plugins/genericprojectmanager/genericprojectnodes.cpp b/src/plugins/genericprojectmanager/genericprojectnodes.cpp
index bdd7b71cdf..271e8a25bd 100644
--- a/src/plugins/genericprojectmanager/genericprojectnodes.cpp
+++ b/src/plugins/genericprojectmanager/genericprojectnodes.cpp
@@ -78,16 +78,14 @@ bool GenericProjectNode::showInSimpleTree() const
     return true;
 }
 
-QList<ProjectAction> GenericProjectNode::supportedActions(Node *node) const
+bool GenericProjectNode::supportsAction(ProjectAction action, Node *node) const
 {
     Q_UNUSED(node);
-    return {
-        AddNewFile,
-        AddExistingFile,
-        AddExistingDirectory,
-        RemoveFile,
-        Rename
-    };
+    return action == AddNewFile
+        || action == AddExistingFile
+        || action == AddExistingDirectory
+        || action == RemoveFile
+        || action == Rename;
 }
 
 bool GenericProjectNode::addFiles(const QStringList &filePaths, QStringList *notAdded)
diff --git a/src/plugins/genericprojectmanager/genericprojectnodes.h b/src/plugins/genericprojectmanager/genericprojectnodes.h
index 3c51d75fa4..8106764262 100644
--- a/src/plugins/genericprojectmanager/genericprojectnodes.h
+++ b/src/plugins/genericprojectmanager/genericprojectnodes.h
@@ -44,8 +44,7 @@ public:
     explicit GenericProjectNode(GenericProject *project);
 
     bool showInSimpleTree() const override;
-
-    QList<ProjectExplorer::ProjectAction> supportedActions(Node *node) const override;
+    bool supportsAction(ProjectExplorer::ProjectAction action, Node *node) const override;
 
     bool addFiles(const QStringList &filePaths, QStringList *notAdded = 0) override;
     bool removeFiles(const QStringList &filePaths, QStringList *notRemoved = 0) override;
diff --git a/src/plugins/nim/project/nimprojectnode.cpp b/src/plugins/nim/project/nimprojectnode.cpp
index 5c22cea185..223c6f950d 100644
--- a/src/plugins/nim/project/nimprojectnode.cpp
+++ b/src/plugins/nim/project/nimprojectnode.cpp
@@ -37,23 +37,19 @@ NimProjectNode::NimProjectNode(NimProject &project,
     , m_project(project)
 {}
 
-QList<ProjectAction> NimProjectNode::supportedActions(Node *node) const
+bool NimProjectNode::supportsAction(ProjectAction action, Node *node) const
 {
-    static const QList<ProjectAction> fileActions = {ProjectAction::Rename,
-                                                     ProjectAction::RemoveFile
-                                                    };
-    static const QList<ProjectAction> folderActions = {ProjectAction::AddNewFile,
-                                                       ProjectAction::RemoveFile,
-                                                       ProjectAction::AddExistingFile
-                                                      };
     switch (node->nodeType()) {
     case NodeType::File:
-        return fileActions;
+        return action == ProjectAction::Rename
+            || action == ProjectAction::RemoveFile;
     case NodeType::Folder:
     case NodeType::Project:
-        return folderActions;
+        return action == ProjectAction::AddNewFile
+            || action == ProjectAction::RemoveFile
+            || action == ProjectAction::AddExistingFile;
     default:
-        return ProjectNode::supportedActions(node);
+        return ProjectNode::supportsAction(action, node);
     }
 }
 
diff --git a/src/plugins/nim/project/nimprojectnode.h b/src/plugins/nim/project/nimprojectnode.h
index ba4dd63415..05270846f9 100644
--- a/src/plugins/nim/project/nimprojectnode.h
+++ b/src/plugins/nim/project/nimprojectnode.h
@@ -38,7 +38,7 @@ class NimProjectNode : public ProjectExplorer::ProjectNode
 public:
     NimProjectNode(NimProject &project, const Utils::FileName &projectFilePath);
 
-    QList<ProjectExplorer::ProjectAction> supportedActions(Node *node) const override;
+    bool supportsAction(ProjectExplorer::ProjectAction action, Node *node) const override;
     bool addFiles(const QStringList &filePaths, QStringList *) override;
     bool removeFiles(const QStringList &filePaths, QStringList *) override;
     bool deleteFiles(const QStringList &) override;
diff --git a/src/plugins/projectexplorer/projectexplorer.cpp b/src/plugins/projectexplorer/projectexplorer.cpp
index 2b0eee0548..0d47cffeb9 100644
--- a/src/plugins/projectexplorer/projectexplorer.cpp
+++ b/src/plugins/projectexplorer/projectexplorer.cpp
@@ -2938,8 +2938,6 @@ void ProjectExplorerPluginPrivate::updateContextMenuActions()
     Node *currentNode = ProjectTree::currentNode();
 
     if (currentNode && currentNode->managingProject()) {
-        QList<ProjectAction> actions = currentNode->supportedActions(currentNode);
-
         ProjectNode *pn;
         if (ContainerNode *cn = currentNode->asContainerNode())
             pn = cn->rootProjectNode();
@@ -2967,56 +2965,61 @@ void ProjectExplorerPluginPrivate::updateContextMenuActions()
                 }
             }
         }
+
+        auto supports = [currentNode](ProjectAction action) {
+            return currentNode->supportsAction(action, currentNode);
+        };
+
         if (currentNode->asFolderNode()) {
             // Also handles ProjectNode
-            m_addNewFileAction->setEnabled(actions.contains(AddNewFile)
+            m_addNewFileAction->setEnabled(currentNode->supportsAction(AddNewFile, currentNode)
                                               && !ICore::isNewItemDialogRunning());
             m_addNewSubprojectAction->setEnabled(currentNode->nodeType() == NodeType::Project
-                                                    && actions.contains(AddSubProject)
+                                                    && supports(AddSubProject)
                                                     && !ICore::isNewItemDialogRunning());
             m_removeProjectAction->setEnabled(currentNode->nodeType() == NodeType::Project
-                                                    && actions.contains(RemoveSubProject));
-            m_addExistingFilesAction->setEnabled(actions.contains(AddExistingFile));
-            m_addExistingDirectoryAction->setEnabled(actions.contains(AddExistingDirectory));
-            m_renameFileAction->setEnabled(actions.contains(Rename));
+                                                    && supports(RemoveSubProject));
+            m_addExistingFilesAction->setEnabled(supports(AddExistingFile));
+            m_addExistingDirectoryAction->setEnabled(supports(AddExistingDirectory));
+            m_renameFileAction->setEnabled(supports(Rename));
         } else if (currentNode->asFileNode()) {
             // Enable and show remove / delete in magic ways:
             // If both are disabled show Remove
             // If both are enabled show both (can't happen atm)
             // If only removeFile is enabled only show it
             // If only deleteFile is enable only show it
-            bool enableRemove = actions.contains(RemoveFile);
+            bool enableRemove = supports(RemoveFile);
             m_removeFileAction->setEnabled(enableRemove);
-            bool enableDelete = actions.contains(EraseFile);
+            bool enableDelete = supports(EraseFile);
             m_deleteFileAction->setEnabled(enableDelete);
             m_deleteFileAction->setVisible(enableDelete);
 
             m_removeFileAction->setVisible(!enableDelete || enableRemove);
-            m_renameFileAction->setEnabled(actions.contains(Rename));
+            m_renameFileAction->setEnabled(supports(Rename));
             const bool currentNodeIsTextFile = isTextFile(
                         ProjectTree::currentNode()->filePath().toString());
             m_diffFileAction->setEnabled(isDiffServiceAvailable()
                         && currentNodeIsTextFile && TextEditor::TextDocument::currentTextDocument());
 
-            m_duplicateFileAction->setVisible(actions.contains(DuplicateFile));
-            m_duplicateFileAction->setEnabled(actions.contains(DuplicateFile));
+            m_duplicateFileAction->setVisible(supports(DuplicateFile));
+            m_duplicateFileAction->setEnabled(supports(DuplicateFile));
 
             EditorManager::populateOpenWithMenu(m_openWithMenu,
                                                 ProjectTree::currentNode()->filePath().toString());
         }
 
-        if (actions.contains(HidePathActions)) {
+        if (supports(HidePathActions)) {
             m_openTerminalHere->setVisible(false);
             m_showInGraphicalShell->setVisible(false);
             m_searchOnFileSystem->setVisible(false);
         }
 
-        if (actions.contains(HideFileActions)) {
+        if (supports(HideFileActions)) {
             m_deleteFileAction->setVisible(false);
             m_removeFileAction->setVisible(false);
         }
 
-        if (actions.contains(HideFolderActions)) {
+        if (supports(HideFolderActions)) {
             m_addNewFileAction->setVisible(false);
             m_addNewSubprojectAction->setVisible(false);
             m_removeProjectAction->setVisible(false);
@@ -3052,8 +3055,7 @@ void ProjectExplorerPluginPrivate::addNewSubproject()
     QString location = directoryFor(currentNode);
 
     if (currentNode->nodeType() == NodeType::Project
-            && currentNode->supportedActions(
-                currentNode).contains(AddSubProject)) {
+            && currentNode->supportsAction(AddSubProject, currentNode)) {
         QVariantMap map;
         map.insert(QLatin1String(Constants::PREFERRED_PROJECT_NODE), QVariant::fromValue(currentNode));
         Project *project = ProjectTree::currentProject();
diff --git a/src/plugins/projectexplorer/projectmodels.cpp b/src/plugins/projectexplorer/projectmodels.cpp
index d9b7a80d41..a733c9ae17 100644
--- a/src/plugins/projectexplorer/projectmodels.cpp
+++ b/src/plugins/projectexplorer/projectmodels.cpp
@@ -145,7 +145,7 @@ Qt::ItemFlags FlatModel::flags(const QModelIndex &index) const
     if (Node *node = nodeForIndex(index)) {
         if (!node->asProjectNode()) {
             // either folder or file node
-            if (node->supportedActions(node).contains(Rename))
+            if (node->supportsAction(Rename, node))
                 f = f | Qt::ItemIsEditable;
         }
     }
diff --git a/src/plugins/projectexplorer/projectnodes.cpp b/src/plugins/projectexplorer/projectnodes.cpp
index 45c78f72ca..e57caa415e 100644
--- a/src/plugins/projectexplorer/projectnodes.cpp
+++ b/src/plugins/projectexplorer/projectnodes.cpp
@@ -215,14 +215,9 @@ bool Node::isEnabled() const
     return parent ? parent->isEnabled() : true;
 }
 
-QList<ProjectAction> Node::supportedActions(Node *node) const
+bool Node::supportsAction(ProjectAction, Node *) const
 {
-    if (FolderNode *folder = parentFolderNode()) {
-        QList<ProjectAction> list = folder->supportedActions(node);
-        list.append(InheritedFromParent);
-        return list;
-    }
-    return {};
+    return false;
 }
 
 void Node::setEnabled(bool enabled)
@@ -364,6 +359,14 @@ QList<FileNode *> FileNode::scanForFiles(const Utils::FileName &directory,
     return scanForFilesRecursively(directory, factory, visited, future, 0.0, 1000000.0);
 }
 
+bool FileNode::supportsAction(ProjectAction action, Node *node) const
+{
+    if (action == InheritedFromParent)
+        return true;
+    FolderNode *parentFolder = parentFolderNode();
+    return parentFolder && parentFolder->supportsAction(action, node);
+}
+
 /*!
   \class ProjectExplorer::FolderNode
 
@@ -593,6 +596,14 @@ QString FolderNode::addFileFilter() const
     return parentFolderNode()->addFileFilter();
 }
 
+bool FolderNode::supportsAction(ProjectAction action, Node *node) const
+{
+    if (action == InheritedFromParent)
+        return true;
+    FolderNode *parentFolder = parentFolderNode();
+    return parentFolder && parentFolder->supportsAction(action, node);
+}
+
 bool FolderNode::addFiles(const QStringList &filePaths, QStringList *notAdded)
 {
     ProjectNode *pn = managingProject();
@@ -812,11 +823,10 @@ QString ContainerNode::displayName() const
     return name;
 }
 
-QList<ProjectAction> ContainerNode::supportedActions(Node *node) const
+bool ContainerNode::supportsAction(ProjectAction action, Node *node) const
 {
-    if (Node *rootNode = m_project->rootProjectNode())
-        return rootNode->supportedActions(node);
-    return {};
+    Node *rootNode = m_project->rootProjectNode();
+    return rootNode && rootNode->supportsAction(action, node);
 }
 
 ProjectNode *ContainerNode::rootProjectNode() const
diff --git a/src/plugins/projectexplorer/projectnodes.h b/src/plugins/projectexplorer/projectnodes.h
index 4ed5b4eb56..efb94d7079 100644
--- a/src/plugins/projectexplorer/projectnodes.h
+++ b/src/plugins/projectexplorer/projectnodes.h
@@ -130,7 +130,7 @@ public:
     virtual QString tooltip() const;
     bool isEnabled() const;
 
-    virtual QList<ProjectAction> supportedActions(Node *node) const;
+    virtual bool supportsAction(ProjectAction action, Node *node) const;
 
     void setEnabled(bool enabled);
     void setAbsoluteFilePathAndLine(const Utils::FileName &filePath, int line);
@@ -179,6 +179,7 @@ public:
     static QList<FileNode *> scanForFiles(const Utils::FileName &directory,
                                           const std::function<FileNode *(const Utils::FileName &fileName)> factory,
                                           QFutureInterface<QList<FileNode *>> *future = nullptr);
+    bool supportsAction(ProjectAction action, Node *node) const override;
 
 private:
     FileType m_fileType;
@@ -225,6 +226,8 @@ public:
 
     virtual QString addFileFilter() const;
 
+    bool supportsAction(ProjectAction action, Node *node) const override;
+
     virtual bool addFiles(const QStringList &filePaths, QStringList *notAdded = 0);
     virtual bool removeFiles(const QStringList &filePaths, QStringList *notRemoved = 0);
     virtual bool deleteFiles(const QStringList &filePaths);
@@ -309,7 +312,7 @@ public:
     ContainerNode(Project *project);
 
     QString displayName() const final;
-    QList<ProjectAction> supportedActions(Node *node) const final;
+    bool supportsAction(ProjectAction action, Node *node) const final;
 
     ContainerNode *asContainerNode() final { return this; }
     const ContainerNode *asContainerNode() const final { return this; }
diff --git a/src/plugins/projectexplorer/projectwizardpage.cpp b/src/plugins/projectexplorer/projectwizardpage.cpp
index 88756a3599..951f2b10fd 100644
--- a/src/plugins/projectexplorer/projectwizardpage.cpp
+++ b/src/plugins/projectexplorer/projectwizardpage.cpp
@@ -240,8 +240,7 @@ static inline AddNewTree *buildAddProjectTree(ProjectNode *root, const QString &
         }
     }
 
-    const QList<ProjectAction> &list = root->supportedActions(root);
-    if (list.contains(AddSubProject) && !list.contains(InheritedFromParent)) {
+    if (root->supportsAction(AddSubProject, root) && !root->supportsAction(InheritedFromParent, root)) {
         if (projectPath.isEmpty() || root->canAddSubProject(projectPath)) {
             FolderNode::AddNewInformation info = root->addNewInformation(QStringList() << projectPath, contextNode);
             auto item = new AddNewTree(root, children, info);
@@ -265,8 +264,7 @@ static inline AddNewTree *buildAddFilesTree(FolderNode *root, const QStringList
             children.append(child);
     }
 
-    const QList<ProjectAction> &list = root->supportedActions(root);
-    if (list.contains(AddNewFile) && !list.contains(InheritedFromParent)) {
+    if (root->supportsAction(AddNewFile, root) && !root->supportsAction(InheritedFromParent, root)) {
         FolderNode::AddNewInformation info = root->addNewInformation(files, contextNode);
         auto item = new AddNewTree(root, children, info);
         selector->inspect(item, root == contextNode);
diff --git a/src/plugins/pythoneditor/pythoneditorplugin.cpp b/src/plugins/pythoneditor/pythoneditorplugin.cpp
index 1e97696fb3..f28818d5b2 100644
--- a/src/plugins/pythoneditor/pythoneditorplugin.cpp
+++ b/src/plugins/pythoneditor/pythoneditorplugin.cpp
@@ -122,11 +122,7 @@ public:
     PythonProjectNode(PythonProject *project);
 
     bool showInSimpleTree() const override;
-
-    QList<ProjectAction> supportedActions(Node *node) const override;
-
     QString addFileFilter() const override;
-
     bool renameFile(const QString &filePath, const QString &newFilePath) override;
 
 private:
@@ -655,13 +651,6 @@ bool PythonProjectNode::showInSimpleTree() const
     return true;
 }
 
-QList<ProjectAction> PythonProjectNode::supportedActions(Node *node) const
-{
-    Q_UNUSED(node);
-    //return { AddNewFile, AddExistingFile, AddExistingDirectory, RemoveFile, Rename };
-    return {};
-}
-
 QString PythonProjectNode::addFileFilter() const
 {
     return QLatin1String("*.py");
diff --git a/src/plugins/qbsprojectmanager/qbsnodes.cpp b/src/plugins/qbsprojectmanager/qbsnodes.cpp
index 45c7dcf111..262145ec6d 100644
--- a/src/plugins/qbsprojectmanager/qbsnodes.cpp
+++ b/src/plugins/qbsprojectmanager/qbsnodes.cpp
@@ -45,6 +45,8 @@
 #include <QIcon>
 #include <QStyle>
 
+using namespace ProjectExplorer;
+
 // ----------------------------------------------------------------------
 // Helpers:
 // ----------------------------------------------------------------------
@@ -223,26 +225,23 @@ public:
 };
 
 
-static QList<ProjectExplorer::ProjectAction> supportedNodeActions(ProjectExplorer::Node *node,
-                                                                  bool managesFiles)
+static bool supportsNodeAction(ProjectAction action, Node *node)
 {
-    QList<ProjectExplorer::ProjectAction> actions;
     const QbsProject * const project = parentQbsProjectNode(node)->project();
     if (!project->isProjectEditable())
-        return actions;
-    if (managesFiles)
-        actions << ProjectExplorer::AddNewFile << ProjectExplorer::AddExistingFile;
+        return false;
 
     auto equalsNodeFilePath = [node](const QString &str)
     {
         return str == node->filePath().toString();
     };
 
-    if (node->nodeType() == ProjectExplorer::NodeType::File
-            && !Utils::contains(project->qbsProject().buildSystemFiles(), equalsNodeFilePath)) {
-        actions << ProjectExplorer::RemoveFile << ProjectExplorer::Rename;
+    if (action == RemoveFile || action == Rename) {
+       if (node->nodeType() == ProjectExplorer::NodeType::File)
+           return !Utils::contains(project->qbsProject().buildSystemFiles(), equalsNodeFilePath);
     }
-    return actions;
+
+    return false;
 }
 
 // ----------------------------------------------------------------------
@@ -271,9 +270,9 @@ QbsFolderNode::QbsFolderNode(const Utils::FileName &folderPath, ProjectExplorer:
 {
 }
 
-QList<ProjectExplorer::ProjectAction> QbsFolderNode::supportedActions(ProjectExplorer::Node *node) const
+bool QbsFolderNode::supportsAction(ProjectAction action, Node *node) const
 {
-    return supportedNodeActions(node, false);
+    return supportsNodeAction(action, node);
 }
 
 // ---------------------------------------------------------------------------
@@ -289,12 +288,6 @@ bool QbsBaseProjectNode::showInSimpleTree() const
     return false;
 }
 
-QList<ProjectExplorer::ProjectAction> QbsBaseProjectNode::supportedActions(ProjectExplorer::Node *node) const
-{
-    Q_UNUSED(node);
-    return QList<ProjectExplorer::ProjectAction>();
-}
-
 // --------------------------------------------------------------------
 // QbsGroupNode:
 // --------------------------------------------------------------------
@@ -309,9 +302,12 @@ QbsGroupNode::QbsGroupNode(const qbs::GroupData &grp, const QString &productPath
     m_qbsGroupData = grp;
 }
 
-QList<ProjectExplorer::ProjectAction> QbsGroupNode::supportedActions(ProjectExplorer::Node *node) const
+bool QbsGroupNode::supportsAction(ProjectAction action, Node *node) const
 {
-    return supportedNodeActions(node, true);
+    if (action == AddNewFile || action == AddExistingFile)
+        return true;
+
+    return supportsNodeAction(action, node);
 }
 
 bool QbsGroupNode::addFiles(const QStringList &filePaths, QStringList *notAdded)
@@ -388,9 +384,12 @@ bool QbsProductNode::showInSimpleTree() const
     return true;
 }
 
-QList<ProjectExplorer::ProjectAction> QbsProductNode::supportedActions(ProjectExplorer::Node *node) const
+bool QbsProductNode::supportsAction(ProjectAction action, Node *node) const
 {
-    return supportedNodeActions(node, true);
+    if (action == AddNewFile || action == AddExistingFile)
+        return true;
+
+    return supportsNodeAction(action, node);
 }
 
 bool QbsProductNode::addFiles(const QStringList &filePaths, QStringList *notAdded)
diff --git a/src/plugins/qbsprojectmanager/qbsnodes.h b/src/plugins/qbsprojectmanager/qbsnodes.h
index 313fa2a6ff..904851bc81 100644
--- a/src/plugins/qbsprojectmanager/qbsnodes.h
+++ b/src/plugins/qbsprojectmanager/qbsnodes.h
@@ -55,7 +55,7 @@ public:
                   const QString &displayName);
 
 private:
-    QList<ProjectExplorer::ProjectAction> supportedActions(ProjectExplorer::Node *node) const override;
+    bool supportsAction(ProjectExplorer::ProjectAction action, Node *node) const final;
 };
 
 // ---------------------------------------------------------------------------
@@ -70,10 +70,6 @@ public:
     explicit QbsBaseProjectNode(const Utils::FileName &absoluteFilePath);
 
     bool showInSimpleTree() const override;
-
-    QList<ProjectExplorer::ProjectAction> supportedActions(Node *node) const override;
-private:
-    friend class QbsGroupNode;
 };
 
 // --------------------------------------------------------------------
@@ -85,7 +81,7 @@ class QbsGroupNode : public QbsBaseProjectNode
 public:
     QbsGroupNode(const qbs::GroupData &grp, const QString &productPath);
 
-    QList<ProjectExplorer::ProjectAction> supportedActions(Node *node) const override;
+    bool supportsAction(ProjectExplorer::ProjectAction action, Node *node) const final;
     bool addFiles(const QStringList &filePaths, QStringList *notAdded = 0) override;
     bool removeFiles(const QStringList &filePaths, QStringList *notRemoved = 0) override;
     bool renameFile(const QString &filePath, const QString &newFilePath) override;
@@ -107,7 +103,7 @@ public:
     explicit QbsProductNode(const qbs::ProductData &prd);
 
     bool showInSimpleTree() const override;
-    QList<ProjectExplorer::ProjectAction> supportedActions(Node *node) const override;
+    bool supportsAction(ProjectExplorer::ProjectAction action, Node *node) const final;
     bool addFiles(const QStringList &filePaths, QStringList *notAdded = 0) override;
     bool removeFiles(const QStringList &filePaths, QStringList *notRemoved = 0) override;
     bool renameFile(const QString &filePath, const QString &newFilePath) override;
diff --git a/src/plugins/qmakeprojectmanager/qmakenodes.cpp b/src/plugins/qmakeprojectmanager/qmakenodes.cpp
index b2ea316330..98c0cae52e 100644
--- a/src/plugins/qmakeprojectmanager/qmakenodes.cpp
+++ b/src/plugins/qmakeprojectmanager/qmakenodes.cpp
@@ -74,9 +74,13 @@ QmakeProFileNode *QmakePriFileNode::proFileNode() const
     return m_qmakeProFileNode;
 }
 
-QList<ProjectAction> QmakePriFileNode::supportedActions(Node *node) const
+bool QmakePriFileNode::supportsAction(ProjectAction action, Node *node) const
 {
-    QList<ProjectAction> actions;
+    if (action == Rename || action == DuplicateFile) {
+        FileNode *fileNode = node->asFileNode();
+        return (fileNode && fileNode->fileType() != FileType::Project)
+                || dynamic_cast<ResourceEditor::ResourceTopLevelNode *>(node);
+    }
 
     const FolderNode *folderNode = this;
     const QmakeProFileNode *proFileNode;
@@ -93,12 +97,12 @@ QList<ProjectAction> QmakePriFileNode::supportedActions(Node *node) const
         // TODO: Some of the file types don't make much sense for aux
         // projects (e.g. cpp). It'd be nice if the "add" action could
         // work on a subset of the file types according to project type.
-
-        actions << AddNewFile;
-        if (pro && pro->knowsFile(node->filePath()))
-            actions << EraseFile;
-        else
-            actions << RemoveFile;
+        if (action == AddNewFile)
+            return true;
+        if (action == EraseFile)
+            return pro && pro->knowsFile(node->filePath());
+        if (action == RemoveFile)
+            return !(pro && pro->knowsFile(node->filePath()));
 
         bool addExistingFiles = true;
         if (node->nodeType() == NodeType::VirtualFolder) {
@@ -115,31 +119,26 @@ QList<ProjectAction> QmakePriFileNode::supportedActions(Node *node) const
 
         addExistingFiles = addExistingFiles && !deploysFolder(node->filePath().toString());
 
-        if (addExistingFiles)
-            actions << AddExistingFile << AddExistingDirectory;
+        if (action == AddExistingFile || action == AddExistingDirectory)
+            return addExistingFiles;
 
         break;
     }
     case ProjectType::SubDirsTemplate:
-        actions << AddSubProject << RemoveSubProject;
+        if (action == AddSubProject || action == RemoveSubProject)
+            return true;
         break;
     default:
         break;
     }
 
-    FileNode *fileNode = node->asFileNode();
-    if ((fileNode && fileNode->fileType() != FileType::Project)
-            || dynamic_cast<ResourceEditor::ResourceTopLevelNode *>(node)) {
-        actions << Rename;
-        actions << DuplicateFile;
+    if (action == HasSubProjectRunConfigurations) {
+        Target *target = m_project->activeTarget();
+        QmakeRunConfigurationFactory *factory = QmakeRunConfigurationFactory::find(target);
+        return factory && !factory->runConfigurationsForNode(target, node).isEmpty();
     }
 
-    Target *target = m_project->activeTarget();
-    QmakeRunConfigurationFactory *factory = QmakeRunConfigurationFactory::find(target);
-    if (factory && !factory->runConfigurationsForNode(target, node).isEmpty())
-        actions << HasSubProjectRunConfigurations;
-
-    return actions;
+    return false;
 }
 
 bool QmakePriFileNode::canAddSubProject(const QString &proFilePath) const
diff --git a/src/plugins/qmakeprojectmanager/qmakenodes.h b/src/plugins/qmakeprojectmanager/qmakenodes.h
index b04751809a..719e42a05a 100644
--- a/src/plugins/qmakeprojectmanager/qmakenodes.h
+++ b/src/plugins/qmakeprojectmanager/qmakenodes.h
@@ -47,7 +47,7 @@ public:
     QmakePriFile *priFile() const;
 
     // ProjectNode interface
-    QList<ProjectExplorer::ProjectAction> supportedActions(Node *node) const override;
+    bool supportsAction(ProjectExplorer::ProjectAction action, Node *node) const override;
 
     bool showInSimpleTree() const override { return false; }
 
diff --git a/src/plugins/qmldesigner/documentmanager.cpp b/src/plugins/qmldesigner/documentmanager.cpp
index 357420c1d8..abf45bfbb1 100644
--- a/src/plugins/qmldesigner/documentmanager.cpp
+++ b/src/plugins/qmldesigner/documentmanager.cpp
@@ -438,7 +438,7 @@ bool DocumentManager::isoProFileSupportsAddingExistingFiles(const QString &resou
     ProjectExplorer::ProjectNode *projectNode = node->parentFolderNode()->asProjectNode();
     if (!projectNode)
         return false;
-    if (!projectNode->supportedActions(projectNode).contains(ProjectExplorer::AddExistingFile)) {
+    if (!projectNode->supportsAction(ProjectExplorer::AddExistingFile, projectNode)) {
         qCWarning(documentManagerLog) << "Project" << projectNode->displayName() << "does not support adding existing files";
         return false;
     }
diff --git a/src/plugins/qmlprojectmanager/qmlprojectnodes.cpp b/src/plugins/qmlprojectmanager/qmlprojectnodes.cpp
index c3e1034baf..ecf191a02f 100644
--- a/src/plugins/qmlprojectmanager/qmlprojectnodes.cpp
+++ b/src/plugins/qmlprojectmanager/qmlprojectnodes.cpp
@@ -57,15 +57,17 @@ bool QmlProjectNode::showInSimpleTree() const
     return true;
 }
 
-QList<ProjectAction> QmlProjectNode::supportedActions(Node *node) const
+bool QmlProjectNode::supportsAction(ProjectAction action, Node *node) const
 {
-    QList<ProjectAction> actions = {AddNewFile, EraseFile};
-    if (node->nodeType() == NodeType::File) {
+    if (action == AddNewFile || action == EraseFile)
+        return true;
+
+    if (action == Rename && node->nodeType() == NodeType::File) {
         FileNode *fileNode = static_cast<FileNode *>(node);
-        if (fileNode->fileType() != FileType::Project)
-            actions.append(Rename);
+        return fileNode->fileType() != FileType::Project;
     }
-    return actions;
+
+    return false;
 }
 
 bool QmlProjectNode::addFiles(const QStringList &filePaths, QStringList * /*notAdded*/)
diff --git a/src/plugins/qmlprojectmanager/qmlprojectnodes.h b/src/plugins/qmlprojectmanager/qmlprojectnodes.h
index 3df7d7e3be..bc715d86f6 100644
--- a/src/plugins/qmlprojectmanager/qmlprojectnodes.h
+++ b/src/plugins/qmlprojectmanager/qmlprojectnodes.h
@@ -38,13 +38,11 @@ class QmlProjectNode : public ProjectExplorer::ProjectNode
 public:
     QmlProjectNode(QmlProject *project);
 
-    virtual bool showInSimpleTree() const override;
-
-    virtual QList<ProjectExplorer::ProjectAction> supportedActions(Node *node) const override;
-
-    virtual bool addFiles(const QStringList &filePaths, QStringList *notAdded = 0) override;
-    virtual bool deleteFiles(const QStringList &filePaths) override;
-    virtual bool renameFile(const QString &filePath, const QString &newFilePath) override;
+    bool showInSimpleTree() const override;
+    bool supportsAction(ProjectExplorer::ProjectAction action, Node *node) const override;
+    bool addFiles(const QStringList &filePaths, QStringList *notAdded = 0) override;
+    bool deleteFiles(const QStringList &filePaths) override;
+    bool renameFile(const QString &filePath, const QString &newFilePath) override;
 
 private:
     QmlProject *m_project;
diff --git a/src/plugins/resourceeditor/resourceeditorplugin.cpp b/src/plugins/resourceeditor/resourceeditorplugin.cpp
index 474092d350..1ae83161ca 100644
--- a/src/plugins/resourceeditor/resourceeditorplugin.cpp
+++ b/src/plugins/resourceeditor/resourceeditorplugin.cpp
@@ -338,8 +338,8 @@ void ResourceEditorPlugin::updateContextActions()
 
     if (isResourceNode) {
         FolderNode *parent = node ? node->parentFolderNode() : 0;
-        enableRename = parent && parent->supportedActions(node).contains(Rename);
-        enableRemove = parent && parent->supportedActions(node).contains(RemoveFile);
+        enableRename = parent && parent->supportsAction(Rename, node);
+        enableRemove = parent && parent->supportsAction(RemoveFile, node);
     }
 
     m_renameResourceFile->setEnabled(isResourceNode && enableRename);
diff --git a/src/plugins/resourceeditor/resourcenode.cpp b/src/plugins/resourceeditor/resourcenode.cpp
index 49c640840a..ffe74eeb42 100644
--- a/src/plugins/resourceeditor/resourcenode.cpp
+++ b/src/plugins/resourceeditor/resourcenode.cpp
@@ -160,7 +160,7 @@ public:
                      ResourceTopLevelNode *topLevel, ResourceFolderNode *prefixNode);
 
     QString displayName() const final;
-    QList<ProjectAction> supportedActions(Node *node) const final;
+    bool supportsAction(ProjectAction, Node *node) const final;
     bool addFiles(const QStringList &filePaths, QStringList *notAdded) final;
     bool removeFiles(const QStringList &filePaths, QStringList *notRemoved) final;
     bool renameFile(const QString &filePath, const QString &newFilePath) final;
@@ -199,17 +199,15 @@ SimpleResourceFolderNode::SimpleResourceFolderNode(const QString &afolderName, c
 
 }
 
-QList<ProjectAction> SimpleResourceFolderNode::supportedActions(Node *) const
+bool SimpleResourceFolderNode::supportsAction(ProjectAction action, Node *) const
 {
-    return {
-        AddNewFile,
-        AddExistingFile,
-        AddExistingDirectory,
-        RemoveFile,
-        DuplicateFile,
-        Rename, // Note: only works for the filename, works akwardly for relative file paths
-        InheritedFromParent // Do not add to list of projects when adding new file
-    };
+    return action == AddNewFile
+        || action == AddExistingFile
+        || action == AddExistingDirectory
+        || action == RemoveFile
+        || action == DuplicateFile
+        || action == Rename // Note: only works for the filename, works akwardly for relative file paths
+        || action == InheritedFromParent; // Do not add to list of projects when adding new file
 }
 
 bool SimpleResourceFolderNode::addFiles(const QStringList &filePaths, QStringList *notAdded)
@@ -387,11 +385,15 @@ QString ResourceTopLevelNode::addFileFilter() const
     return QLatin1String("*.png; *.jpg; *.gif; *.svg; *.ico; *.qml; *.qml.ui");
 }
 
-QList<ProjectAction> ResourceTopLevelNode::supportedActions(Node *node) const
+bool ResourceTopLevelNode::supportsAction(ProjectAction action, Node *node) const
 {
     if (node != this)
-        return {};
-    return {AddNewFile, AddExistingFile, AddExistingDirectory, HidePathActions, Rename};
+        return false;
+    return action == AddNewFile
+        || action == AddExistingFile
+        || action == AddExistingDirectory
+        || action == HidePathActions
+        || action == Rename;
 }
 
 bool ResourceTopLevelNode::addFiles(const QStringList &filePaths, QStringList *notAdded)
@@ -504,25 +506,23 @@ ResourceFolderNode::~ResourceFolderNode()
 
 }
 
-QList<ProjectAction> ResourceFolderNode::supportedActions(Node *node) const
+bool ResourceFolderNode::supportsAction(ProjectAction action, Node *node) const
 {
     Q_UNUSED(node)
-    QList<ProjectAction> actions = {
-        AddNewFile,
-        AddExistingFile,
-        AddExistingDirectory,
-        RemoveFile,
-        DuplicateFile,
-        Rename, // Note: only works for the filename, works akwardly for relative file paths
-        HidePathActions, // hides open terminal etc.
-    };
 
-    // if the prefix is '/' (without lang) hide this node in add new dialog,
-    // as the ResouceTopLevelNode is always shown for the '/' prefix
-    if (m_prefix == QLatin1String("/") && m_lang.isEmpty())
-        actions << InheritedFromParent;
+    if (action == InheritedFromParent) {
+        // if the prefix is '/' (without lang) hide this node in add new dialog,
+        // as the ResouceTopLevelNode is always shown for the '/' prefix
+        return m_prefix == QLatin1String("/") && m_lang.isEmpty();
+    }
 
-    return actions;
+    return action == AddNewFile
+        || action == AddExistingFile
+        || action == AddExistingDirectory
+        || action == RemoveFile
+        || action == DuplicateFile
+        || action == Rename // Note: only works for the filename, works akwardly for relative file paths
+        || action == HidePathActions; // hides open terminal etc.
 }
 
 bool ResourceFolderNode::addFiles(const QStringList &filePaths, QStringList *notAdded)
@@ -674,12 +674,11 @@ QString ResourceFileNode::qrcPath() const
     return m_qrcPath;
 }
 
-QList<ProjectAction> ResourceFileNode::supportedActions(Node *node) const
+bool ResourceFileNode::supportsAction(ProjectAction action, Node *node) const
 {
-    QList<ProjectAction> actions = parentFolderNode()->supportedActions(node);
-    actions.removeOne(HidePathActions);
-    return actions;
+    if (action == HidePathActions)
+        return false;
+    return parentFolderNode()->supportsAction(action, node);
 }
 
-
 } // ResourceEditor
diff --git a/src/plugins/resourceeditor/resourcenode.h b/src/plugins/resourceeditor/resourcenode.h
index aa7ff02580..0d6b7a1b64 100644
--- a/src/plugins/resourceeditor/resourcenode.h
+++ b/src/plugins/resourceeditor/resourcenode.h
@@ -41,7 +41,7 @@ public:
 
     QString addFileFilter() const override;
 
-    QList<ProjectExplorer::ProjectAction> supportedActions(Node *node) const override;
+    bool supportsAction(ProjectExplorer::ProjectAction action, Node *node) const override;
     bool addFiles(const QStringList &filePaths, QStringList *notAdded) override;
     bool removeFiles(const QStringList &filePaths, QStringList *notRemoved) override;
 
@@ -67,7 +67,7 @@ public:
     ResourceFolderNode(const QString &prefix, const QString &lang, ResourceTopLevelNode *parent);
     ~ResourceFolderNode() override;
 
-    QList<ProjectExplorer::ProjectAction> supportedActions(Node *node) const override;
+    bool supportsAction(ProjectExplorer::ProjectAction action, Node *node) const override;
 
     QString displayName() const override;
 
@@ -97,7 +97,7 @@ public:
 
     QString displayName() const override;
     QString qrcPath() const;
-    QList<ProjectExplorer::ProjectAction> supportedActions(Node *node) const override;
+    bool supportsAction(ProjectExplorer::ProjectAction action, Node *node) const override;
 
 private:
     QString m_qrcPath;