3 files changed, 33 insertions, 0 deletions
diff --git a/src/gui/text/qtextdocument.cpp b/src/gui/text/qtextdocument.cpp
index a8956b8..5398111 100644
--- a/src/gui/text/qtextdocument.cpp
+++ b/src/gui/text/qtextdocument.cpp
@@ -956,6 +956,8 @@ QString QTextDocument::defaultStyleSheet() const
 
 /*!
     Returns true if undo is available; otherwise returns false.
+
+    \sa isRedoAvailable(), availableUndoSteps()
 */
 bool QTextDocument::isUndoAvailable() const
 {
@@ -965,6 +967,8 @@ bool QTextDocument::isUndoAvailable() const
 
 /*!
     Returns true if redo is available; otherwise returns false.
+
+    \sa isUndoAvailable(), availableRedoSteps()
 */
 bool QTextDocument::isRedoAvailable() const
 {
@@ -972,6 +976,29 @@ bool QTextDocument::isRedoAvailable() const
     return d->isRedoAvailable();
 }
 
+/*! \since 4.6
+
+    Returns the number of available undo steps.
+
+    \sa isUndoAvailable()
+*/
+int QTextDocument::availableUndoSteps() const
+{
+    Q_D(const QTextDocument);
+    return d->availableUndoSteps();
+}
+
+/*! \since 4.6
+
+    Returns the number of available redo steps.
+
+    \sa isRedoAvailable()
+*/
+int QTextDocument::availableRedoSteps() const
+{
+    Q_D(const QTextDocument);
+    return d->availableRedoSteps();
+}
 
 /*! \since 4.4
 
diff --git a/src/gui/text/qtextdocument.h b/src/gui/text/qtextdocument.h
index e52716a..d217a4d 100644
--- a/src/gui/text/qtextdocument.h
+++ b/src/gui/text/qtextdocument.h
@@ -142,6 +142,9 @@ public:
     bool isUndoAvailable() const;
     bool isRedoAvailable() const;
 
+    int availableUndoSteps() const;
+    int availableRedoSteps() const;
+
     int revision() const;
 
     void setDocumentLayout(QAbstractTextDocumentLayout *layout);
diff --git a/src/gui/text/qtextdocument_p.h b/src/gui/text/qtextdocument_p.h
index ce25c57..c10855b 100644
--- a/src/gui/text/qtextdocument_p.h
+++ b/src/gui/text/qtextdocument_p.h
@@ -212,6 +212,9 @@ public:
     inline bool isUndoAvailable() const { return undoEnabled && undoState > 0; }
     inline bool isRedoAvailable() const { return undoEnabled && undoState < undoStack.size(); }
 
+    inline int availableUndoSteps() const { return undoEnabled ? undoState : 0; }
+    inline int availableRedoSteps() const { return undoEnabled ? qMax(undoStack.size() - undoState - 1, 0) : 0; }
+
     inline QString buffer() const { return text; }
     QString plainText() const;
     inline int length() const { return fragments.length(); }