Utils: Add Undo facilities for aspects

Change-Id: I2a8acfa23b3a4303414be21af224b08c13561666
Reviewed-by: hjk <hjk@qt.io>

src/libs/utils/aspects.cpp

@@ -31,6 +31,7 @@
 #include <QSettings>
 #include <QSpinBox>
 #include <QTextEdit>
+#include <QUndoStack>
 
 using namespace Layouting;
 
@@ -84,6 +85,8 @@ public:
     BaseAspect::DataCreator m_dataCreator;
     BaseAspect::DataCloner m_dataCloner;
     QList<BaseAspect::DataExtractor> m_dataExtractors;
+
+    QUndoStack *m_undoStack = nullptr;
 };
 
 /*!
@@ -302,6 +305,29 @@ void BaseAspect::setToolTip(const QString &tooltip)
     }
 }
 
+void BaseAspect::setUndoStack(QUndoStack *undoStack)
+{
+    d->m_undoStack = undoStack;
+}
+
+QUndoStack *BaseAspect::undoStack() const
+{
+    return d->m_undoStack;
+}
+
+void BaseAspect::pushUndo(QUndoCommand *cmd)
+{
+    if (!cmd)
+        return;
+
+    if (d->m_undoStack)
+        d->m_undoStack->push(cmd);
+    else {
+        cmd->redo();
+        delete cmd;
+    }
+}
+
 bool BaseAspect::isEnabled() const
 {
     return d->m_enabled;
@@ -2645,6 +2671,14 @@ bool AspectContainer::isDirty()
     return false;
 }
 
+void AspectContainer::setUndoStack(QUndoStack *undoStack)
+{
+    BaseAspect::setUndoStack(undoStack);
+
+    for (BaseAspect *aspect : std::as_const(d->m_items))
+        aspect->setUndoStack(undoStack);
+}
+
 bool AspectContainer::equals(const AspectContainer &other) const
 {
     // FIXME: Expensive, but should not really be needed in a fully aspectified world.