Designer: Use static pattern for FormEditorW singleton

Change-Id: Icf4a0135d9bc8441d468fd77abe29adcee677bb9
Reviewed-by: Christian Stenger <christian.stenger@digia.com>

src/plugins/designer/formwindowfile.cpp

@@ -29,6 +29,7 @@
 
 #include "formwindowfile.h"
 #include "designerconstants.h"
+#include "resourcehandler.h"
 
 #include <utils/qtcassert.h>
 
@@ -60,6 +61,10 @@ FormWindowFile::FormWindowFile(QDesignerFormWindowInterface *form, QObject *pare
     connect(m_formWindow->commandHistory(), SIGNAL(indexChanged(int)),
             this, SLOT(setShouldAutoSave()));
     connect(m_formWindow, SIGNAL(changed()), SLOT(updateIsModified()));
+
+    m_resourceHandler = new ResourceHandler(form);
+    connect(this, SIGNAL(filePathChanged(QString,QString)),
+            m_resourceHandler, SLOT(updateResources()));
 }
 
 bool FormWindowFile::save(QString *errorString, const QString &name, bool autoSave)
@@ -217,6 +222,11 @@ QString FormWindowFile::formWindowContents() const
     return m_formWindow->contents();
 }
 
+ResourceHandler *FormWindowFile::resourceHandler() const
+{
+    return m_resourceHandler;
+}
+
 void FormWindowFile::slotFormWindowRemoved(QDesignerFormWindowInterface *w)
 {
     // Release formwindow as soon as the FormWindowManager removes