Designer: Prepare re-implementation of "Goto Slot".

...making use of the new code model features. Move code to
separate file. Make it possible to obtain path to generated
header file from project manager.

src/plugins/qt4projectmanager/qt4project.cpp

@@ -787,6 +787,38 @@ QStringList Qt4Project::files(FilesMode fileMode) const
     return files;
 }
 
+// Find the folder that contains a file a certain type (recurse down)
+static FolderNode *folderOf(FolderNode *in, FileType fileType, const QString &fileName)
+{
+    foreach(FileNode *fn, in->fileNodes())
+        if (fn->fileType() == fileType && fn->path() == fileName)
+            return in;
+    foreach(FolderNode *folder, in->subFolderNodes())
+        if (FolderNode *pn = folderOf(folder, fileType, fileName))
+            return pn;
+    return 0;
+}
+
+// Find the Qt4ProFileNode that contains a file of a certain type.
+// First recurse down to folder, then find the pro-file.
+static Qt4ProFileNode *proFileNodeOf(Qt4ProFileNode *in, FileType fileType, const QString &fileName)
+{
+    for (FolderNode *folder =  folderOf(in, fileType, fileName); folder; folder = folder->parentFolderNode())
+        if (Qt4ProFileNode *proFile = qobject_cast<Qt4ProFileNode *>(folder))
+            return proFile;
+    return 0;
+}
+
+QString Qt4Project::generatedUiHeader(const QString &formFile) const
+{
+    // Look in sub-profiles as SessionManager::projectForFile returns
+    // the top-level project only.
+    if (m_rootProjectNode)
+        if (const Qt4ProFileNode *pro = proFileNodeOf(m_rootProjectNode, FormType, formFile))
+            return Qt4ProFileNode::uiHeaderFile(pro->uiDirectory(), formFile);
+    return QString();
+}
+
 QList<ProjectExplorer::Project*> Qt4Project::dependsOn()
 {
     // NBS implement dependsOn
@@ -820,8 +852,6 @@ void Qt4Project::updateActiveRunConfiguration()
     emit targetInformationChanged();
 }
 
-
-
 BuildConfigWidget *Qt4Project::createConfigWidget()
 {
     return new Qt4ProjectConfigWidget(this);