Qt Designer: Clean up the SDK headers

- Use "= default" for constructors/destructors
- Disable copy/move for non-QObject type interfaces and
  add constructors were needed
- Remove duplicated disable copy for QObject type interfaces
- Fix some formatting
- Remove default implementation of
  QDesignerContainerExtension::canAddWidget()/canRemoveWidget()
- Remove Qt 6 fixme comments

Task-number: QTBUG-79896
Change-Id: If9521910c6488c081817e2ccdbf42de578cb16ad
Reviewed-by: Jarek Kobus <jaroslaw.kobus@qt.io>

3 files changed, 15 insertions, 0 deletions

diff --git a/examples/designer/containerextension/multipagewidgetcontainerextension.cpp b/examples/designer/containerextension/multipagewidgetcontainerextension.cpp
index ca9e79d78..2c8eff6bd 100644
--- a/examples/designer/containerextension/multipagewidgetcontainerextension.cpp
+++ b/examples/designer/containerextension/multipagewidgetcontainerextension.cpp
@@ -61,6 +61,11 @@ MultiPageWidgetContainerExtension::MultiPageWidgetContainerExtension(MultiPageWi
 //! [0]
 
 //! [1]
+bool MultiPageWidgetContainerExtension::canAddWidget() const
+{
+    return true;
+}
+
 void MultiPageWidgetContainerExtension::addWidget(QWidget *widget)
 {
     myWidget->addPage(widget);
@@ -89,6 +94,12 @@ void MultiPageWidgetContainerExtension::insertWidget(int index, QWidget *widget)
 //! [4]
 
 //! [5]
+bool MultiPageWidgetContainerExtension::canRemove(int index) const
+{
+    Q_UNUSED(index);
+    return true;
+}
+
 void MultiPageWidgetContainerExtension::remove(int index)
 {
     myWidget->removePage(index);
diff --git a/examples/designer/containerextension/multipagewidgetcontainerextension.h b/examples/designer/containerextension/multipagewidgetcontainerextension.h
index 7813aee9e..47814c692 100644
--- a/examples/designer/containerextension/multipagewidgetcontainerextension.h
+++ b/examples/designer/containerextension/multipagewidgetcontainerextension.h
@@ -68,10 +68,12 @@ class MultiPageWidgetContainerExtension: public QObject,
 public:
     explicit MultiPageWidgetContainerExtension(MultiPageWidget *widget, QObject *parent);
 
+    bool canAddWidget() const override;
     void addWidget(QWidget *widget) override;
     int count() const override;
     int currentIndex() const override;
     void insertWidget(int index, QWidget *widget) override;
+    bool canRemove(int index) const override;
     void remove(int index) override;
     void setCurrentIndex(int index) override;
     QWidget *widget(int index) const override;
diff --git a/examples/designer/doc/src/containerextension.qdoc b/examples/designer/doc/src/containerextension.qdoc
index ce5d161ff..53d595729 100644
--- a/examples/designer/doc/src/containerextension.qdoc
+++ b/examples/designer/doc/src/containerextension.qdoc
@@ -429,6 +429,7 @@
     \snippet containerextension/multipagewidgetcontainerextension.cpp 3
 
     You must reimplement \l
+    {QDesignerContainerExtension::canAddWidget()}{canAddWidget()} and \l
     {QDesignerContainerExtension::addWidget()}{addWidget()} adding a
     given page to the container, \l
     {QDesignerContainerExtension::count()}{count()} returning the
@@ -447,6 +448,7 @@
     You must reimplement \l
     {QDesignerContainerExtension::insertWidget()}{insertWidget()}
     adding a given page to the container at a given index, \l
+    {QDesignerContainerExtension::canRemove()}{canRemove()} and \l
     {QDesignerContainerExtension::remove()}{remove()} deleting the
     page at a given index, \l
     {QDesignerContainerExtension::setCurrentIndex()}{setCurrentIndex()}