Fix the Creator widgets Designer plugin, add DetailsWidgets.

Polish the DetailsWidget for that purpose, add properties,
make it survive without widgets, add a container extension.

src/tools/qtcreatorwidgets/customwidgets.cpp

@@ -31,6 +31,8 @@
 
 #include <QtGui/QMenu>
 #include <QtGui/QAction>
+#include <QtDesigner/QExtensionManager>
+#include <QtDesigner/QDesignerFormEditorInterface>
 
 static const char *groupC = "QtCreator";
 
@@ -165,11 +167,125 @@ PathListEditor_CW::PathListEditor_CW(QObject *parent) :
 {
 }
 
+DetailsButton_CW::DetailsButton_CW(QObject *parent) :
+    QObject(parent),
+    CustomWidget<Utils::DetailsButton>
+    (QLatin1String("<utils/detailsbutton.h>"),
+    false,
+    QLatin1String(groupC),
+    QIcon(),
+    QLatin1String("Expandable button for 'Details'"))
+{
+}
+
+DetailsWidget_CW::DetailsWidget_CW(QObject *parent) :
+    QObject(parent),
+    CustomWidget<Utils::DetailsWidget>
+    (QLatin1String("<utils/detailswidget.h>"),
+    true,
+    QLatin1String(groupC),
+    QIcon(),
+    QLatin1String("Expandable widget for 'Details'. You might need an expandable spacer below."))
+{
+}
+
+QString DetailsWidget_CW::domXml() const
+{
+    // Expanded from start, else child visibility is wrong
+    const char *xmlC ="\
+<ui language=\"c++\" displayname=\"DetailsWidget\">\
+    <widget class=\"Utils::DetailsWidget\" name=\"detailsWidget\">\
+        <property name=\"geometry\">\
+            <rect><x>0</x><y>0</y><width>160</width><height>80</height></rect>\
+        </property>\
+        <property name=\"summaryText\">\
+            <string>Summary</string>\
+        </property>\
+        <property name=\"expanded\">\
+            <bool>true</bool>\
+        </property>\
+        <widget class=\"QWidget\" name=\"detailsContainer\" />\
+    </widget>\
+    <customwidgets>\
+        <customwidget>\
+            <class>Utils::DetailsWidget</class>\
+            <addpagemethod>setWidget</addpagemethod>\
+        </customwidget>\
+    </customwidgets>\
+</ui>";
+    return QLatin1String(xmlC);
+}
+
+void DetailsWidget_CW::initialize(QDesignerFormEditorInterface *core)
+{
+    const bool firstTime = !initialized();
+    CustomWidget<Utils::DetailsWidget>::initialize(core);    
+    if (firstTime)
+        if (QExtensionManager *manager = core->extensionManager())
+            manager->registerExtensions(new DetailsWidgetExtensionFactory(manager), Q_TYPEID(QDesignerContainerExtension));
+}
+
+DetailsWidgetContainerExtension::DetailsWidgetContainerExtension(Utils::DetailsWidget *widget, QObject *parent) :
+    QObject(parent),
+    m_detailsWidget(widget)
+{
+}
+
+void DetailsWidgetContainerExtension::addWidget(QWidget *widget)
+{
+    if (m_detailsWidget->widget()) {
+        qWarning("Cannot add 2nd child to DetailsWidget");
+    } else {
+        m_detailsWidget->setWidget(widget);
+    }
+}
+
+int DetailsWidgetContainerExtension::count() const
+{
+    return m_detailsWidget->widget() ? 1 : 0;
+}
+
+int DetailsWidgetContainerExtension::currentIndex() const
+{
+    return 0;
+}
+
+void DetailsWidgetContainerExtension::insertWidget(int /* index */, QWidget *widget)
+{
+    addWidget(widget);
+}
+
+void DetailsWidgetContainerExtension::remove(int /* index */)
+{
+    m_detailsWidget->setWidget(0);
+}
+
+void DetailsWidgetContainerExtension::setCurrentIndex(int /* index */)
+{
+}
+
+QWidget *DetailsWidgetContainerExtension::widget(int  /* index */) const
+{
+    return m_detailsWidget->widget();
+}
+
+DetailsWidgetExtensionFactory::DetailsWidgetExtensionFactory(QExtensionManager *parent) :
+    QExtensionFactory(parent)
+{
+}
+
+QObject *DetailsWidgetExtensionFactory::createExtension(QObject *object, const QString &iid, QObject *parent) const
+{
+    if (Utils::DetailsWidget *dw = qobject_cast<Utils::DetailsWidget*>(object))
+        if (iid == Q_TYPEID(QDesignerContainerExtension))
+            return new DetailsWidgetContainerExtension(dw, parent);
+    return 0;
+}
+
 // -------------- WidgetCollection
 WidgetCollection::WidgetCollection(QObject *parent) :
     QObject(parent)
 {
-
     m_plugins.push_back(new NewClassCustomWidget(this));
     m_plugins.push_back(new ClassNameValidatingLineEdit_CW(this));
     m_plugins.push_back(new FileNameValidatingLineEdit_CW(this));
@@ -181,6 +297,8 @@ WidgetCollection::WidgetCollection(QObject *parent) :
     m_plugins.push_back(new SubmitEditorWidget_CW(this));
     m_plugins.push_back(new SubmitFieldWidget_CW(this));
     m_plugins.push_back(new PathListEditor_CW(this));
+    m_plugins.push_back(new DetailsButton_CW(this));
+    m_plugins.push_back(new DetailsWidget_CW(this));
 }
 
 QList<QDesignerCustomWidgetInterface*> WidgetCollection::customWidgets() const