ProjectExplorer: Add a way to iterate over the node tree

Similar to what is used in Utils::TreeModel: Use lambdas
as "visitor".

Change-Id: Ia6e1a7ec022b61f94b01e1e8476bb932d22fd161
Reviewed-by: Tobias Hunger <tobias.hunger@qt.io>

src/plugins/projectexplorer/projectnodes.cpp

@@ -335,6 +335,38 @@ QIcon FolderNode::icon() const
     return m_icon;
 }
 
+void FolderNode::forEachNode(const std::function<void(FileNode *)> &fileTask,
+                             const std::function<void(FolderNode *)> &folderTask,
+                             const std::function<bool(const FolderNode *)> &folderFilterTask) const
+{
+    if (folderFilterTask) {
+        if (!folderFilterTask(this))
+            return;
+    }
+    if (fileTask) {
+        for (Node *n : m_nodes) {
+            if (FileNode *fn = n->asFileNode())
+                fileTask(fn);
+        }
+    }
+    for (Node *n : m_nodes) {
+        if (FolderNode *fn = n->asFolderNode()) {
+            if (folderTask)
+                folderTask(fn);
+            fn->forEachNode(fileTask, folderTask, folderFilterTask);
+        }
+    }
+}
+
+void FolderNode::forEachGenericNode(const std::function<void(Node *)> &genericTask) const
+{
+    for (Node *n : m_nodes) {
+        genericTask(n);
+        if (FolderNode *fn = n->asFolderNode())
+            fn->forEachNode(genericTask);
+    }
+}
+
 QList<FileNode*> FolderNode::fileNodes() const
 {
     QList<FileNode *> result;

src/plugins/projectexplorer/projectnodes.h

@@ -194,6 +194,10 @@ public:
     QString displayName() const override;
     QIcon icon() const;
 
+    void forEachNode(const std::function<void(FileNode *)> &fileTask,
+                     const std::function<void(FolderNode *)> &folderTask = {},
+                     const std::function<bool(const FolderNode *)> &folderFilterTask = {}) const;
+    void forEachGenericNode(const std::function<void(Node *)> &genericTask) const;
     const QList<Node *> nodes() const { return m_nodes; }
     QList<FileNode *> fileNodes() const;
     FileNode *fileNode(const Utils::FileName &file) const;