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/libs/utils/detailswidget.cpp

@@ -3,21 +3,23 @@
 
 #include <QtGui/QGridLayout>
 #include <QtCore/QStack>
+#include <QtGui/QLabel>
+#include <QtGui/QGridLayout>
 #include <QtGui/QPainter>
 
 using namespace Utils;
 
 DetailsWidget::DetailsWidget(QWidget *parent)
     : QWidget(parent),
+      m_summaryLabel(new QLabel(this)),
+      m_detailsButton(new DetailsButton(this)),
       m_widget(0),
-      m_toolWidget(0)
+      m_toolWidget(0),
+      m_grid(new QGridLayout(this))
+
 {
-    m_grid = new QGridLayout(this);
-    //m_grid->setMargin(0);
-    m_summaryLabel = new QLabel(this);
     m_summaryLabel->setTextInteractionFlags(Qt::TextSelectableByMouse);
     m_summaryLabel->setSizePolicy(QSizePolicy::Expanding, QSizePolicy::Fixed);
-    m_detailsButton = new DetailsButton(this);
 
     m_grid->addWidget(m_summaryLabel, 0, 0, 2, 0);
     m_grid->addWidget(m_detailsButton, 1, 2);
@@ -45,8 +47,8 @@ void DetailsWidget::paintEvent(QPaintEvent *paintEvent)
     if (!m_detailsButton->isToggled())
         return;
 
-    QRect detailsGeometry = m_detailsButton->geometry();
-    QRect widgetGeometry = m_widget->geometry();
+    const QRect detailsGeometry = m_detailsButton->geometry();
+    const QRect widgetGeometry = m_widget ? m_widget->geometry() : QRect(x(), y() + height(), width(), 0);
 
     QPoint tl(detailsGeometry.topLeft());
     tl += QPoint(-3, -3);
@@ -85,29 +87,65 @@ void DetailsWidget::setSummaryText(const QString &text)
     m_summaryLabel->setText(text);
 }
 
+QString DetailsWidget::summaryText() const
+{
+    return m_summaryLabel->text();
+}
+
+bool DetailsWidget::expanded() const
+{
+    return m_detailsButton->isToggled();
+}
+
+void DetailsWidget::setExpanded(bool v)
+{
+    if (expanded() != v)
+        m_detailsButton->animateClick();
+}
+
+QWidget *DetailsWidget::widget() const
+{
+    return m_widget;
+}
+
 void DetailsWidget::setWidget(QWidget *widget)
 {
     if (m_widget == widget)
         return;
-    if (m_widget)
+    if (m_widget) {
         m_grid->removeWidget(m_widget);
-    m_grid->addWidget(widget, 2, 0, 1, 3);
-    m_widget = widget;
-    m_widget->setVisible(m_detailsButton->isToggled());
+        m_widget = 0;
+    }
+    if (widget) {
+        m_grid->addWidget(widget, 2, 0, 1, 3);
+        m_widget = widget;
+        m_widget->setVisible(m_detailsButton->isToggled());
+    }
 }
 
 void DetailsWidget::setToolWidget(QWidget *widget)
 {
     if (m_toolWidget == widget)
         return;
-    if (m_toolWidget)
+    if (m_toolWidget) {
         m_grid->removeWidget(m_toolWidget);
-    m_grid->addWidget(widget, 1, 1);
-    m_toolWidget = widget;
+        m_toolWidget = 0;
+    }
+    if (widget) {
+        m_grid->addWidget(widget, 1, 1);
+        m_toolWidget = widget;
+    }
+}
+
+QWidget *DetailsWidget::toolWidget() const
+{
+    return m_toolWidget;
 }
 
 void DetailsWidget::fixUpLayout()
 {
+    if (!m_widget)
+        return;
     QWidget *parent = m_widget;
     QStack<QWidget *> widgets;
     while((parent = parent->parentWidget()) && parent && parent->layout()) {