ProjectExplorer: Handle project file list globally

Handle the generation of the list of files in a project globally, based
on the project tree.

Creator now has the concept of TreeManagers which can enrich the project
tree with additional data (e.g. the files found in a resource file), which
the project does not necessarily know about. So use that tree to find
the files that belong to a project instead of implementing similar features
in each project.

Change-Id: Ia375a914a1f2c0adaa427f9eda834eec2db07f68
Reviewed-by: hjk <hjk@qt.io>
Reviewed-by: Marco Benelli <marco.benelli@qt.io>

src/plugins/projectexplorer/project.cpp

@@ -476,6 +476,7 @@ void Project::setRootProjectNode(ProjectNode *root)
     if (root)
         root->setParentFolderNode(&d->m_containerNode);
     ProjectTree::emitSubtreeChanged(root);
+    emit fileListChanged();
 
     delete oldNode;
 }
@@ -524,6 +525,25 @@ Project::RestoreResult Project::restoreSettings(QString *errorMessage)
     return result;
 }
 
+QStringList Project::files(Project::FilesMode fileMode,
+                           const std::function<bool (const FileNode *)> &filter) const
+{
+    QStringList result;
+
+    if (!rootProjectNode())
+        return result;
+
+    rootProjectNode()->forEachNode([&](const FileNode *fn) {
+        if (filter && !filter(fn))
+            return;
+        if ((fileMode == AllFiles)
+                || (fileMode == SourceFiles && !fn->isGenerated())
+                || (fileMode == GeneratedFiles && fn->isGenerated()))
+            result.append(fn->filePath().toString());
+    });
+    return result;
+}
+
 
 /*!
     Serializes all data into a QVariantMap.