QmlDesigner.ItemLibrary: load QML source on startup

The QML source is now loaded while dragging, which creates
hickups.

Change-Id: If43e4661881f94d6a6f692981f19a61ac2c0e508
Reviewed-by: Marco Bubke <marco.bubke@digia.com>

src/plugins/qmldesigner/designercore/include/itemlibraryinfo.h

@@ -70,6 +70,7 @@ public:
     QString category() const;
     QIcon dragIcon() const;
     QString qml() const;
+    QString qmlSource() const;
     QString requiredImport() const;
     bool forceImport() const;
 

src/plugins/qmldesigner/designercore/metainfo/itemlibraryinfo.cpp

@@ -32,6 +32,8 @@
 
 #include <QSharedData>
 
+#include <utils/fileutils.h>
+
 namespace QmlDesigner {
 
 namespace Internal {
@@ -51,6 +53,7 @@ public:
     QIcon dragIcon;
     QList<PropertyContainer> properties;
     QString qml;
+    QString qmlSource;
     QString requiredImport;
     bool forceImport;
 };
@@ -123,6 +126,11 @@ QString ItemLibraryEntry::qml() const
     return m_data->qml;
 }
 
+QString ItemLibraryEntry::qmlSource() const
+{
+    return m_data->qmlSource;
+}
+
 QString ItemLibraryEntry::requiredImport() const
 {
     return m_data->requiredImport;
@@ -183,6 +191,7 @@ void ItemLibraryEntry::setIconPath(const QString &iconPath)
 void ItemLibraryEntry::setQml(const QString &qml)
 {
     m_data->qml = qml;
+    m_data->qmlSource = Utils::FileReader::fetchQrc(qml);
 }
 
 void ItemLibraryEntry::setRequiredImport(const QString &requiredImport)
@@ -217,6 +226,7 @@ QDataStream& operator<<(QDataStream& stream, const ItemLibraryEntry &itemLibrary
 
     stream << itemLibraryEntry.m_data->properties;
     stream << itemLibraryEntry.m_data->qml;
+    stream << itemLibraryEntry.m_data->qmlSource;
 
     return stream;
 }
@@ -236,6 +246,7 @@ QDataStream& operator>>(QDataStream& stream, ItemLibraryEntry &itemLibraryEntry)
 
     stream >> itemLibraryEntry.m_data->properties;
     stream >> itemLibraryEntry.m_data->qml;
+    stream >> itemLibraryEntry.m_data->qmlSource;
 
     return stream;
 }
@@ -255,6 +266,7 @@ QDebug operator<<(QDebug debug, const ItemLibraryEntry &itemLibraryEntry)
 
     debug << itemLibraryEntry.m_data->properties;
     debug << itemLibraryEntry.m_data->qml;
+    debug << itemLibraryEntry.m_data->qmlSource;
 
     return debug.space();
 }

src/plugins/qmldesigner/designercore/model/qmlmodelview.cpp

@@ -233,7 +233,7 @@ QmlItemNode QmlModelView::createQmlItemNode(const ItemLibraryEntry &itemLibraryE
             QPlainTextEdit textEdit;
 
 
-            textEdit.setPlainText(Utils::FileReader::fetchQrc(itemLibraryEntry.qml()));
+            textEdit.setPlainText(itemLibraryEntry.qmlSource());
             NotIndentingTextEditModifier modifier(&textEdit);
 
             QScopedPointer<RewriterView> rewriterView(new RewriterView(RewriterView::Amend, 0));