1 files changed, 57 insertions, 3 deletions

diff --git a/noncore/graphics/drawpad/page.cpp b/noncore/graphics/drawpad/page.cpp
index 601d1c3..fbf3d01 100644
--- a/noncore/graphics/drawpad/page.cpp
+++ b/noncore/graphics/drawpad/page.cpp
@@ -13,28 +13,41 @@
 
 #include "page.h"
 
+const int PAGE_BACKUPS = 99;
+
 Page::Page()
-    : QPixmap()
 {
+    m_title = "";
     m_lastModified = QDateTime::currentDateTime();
+    m_pPixmap = new QPixmap();
+
+    m_backHistory.setAutoDelete(true);
+    m_forwardHistory.setAutoDelete(true);
 }
 
 Page::Page(QString title, int w, int h)
-    : QPixmap(w, h)
 {
     m_title = title;
     m_lastModified = QDateTime::currentDateTime();
+    m_pPixmap = new QPixmap(w, h);
+
+    m_backHistory.setAutoDelete(true);
+    m_forwardHistory.setAutoDelete(true);
 }
 
 Page::Page(QString title, const QSize& size)
-    : QPixmap(size)
 {
     m_title = title;
     m_lastModified = QDateTime::currentDateTime();
+    m_pPixmap = new QPixmap(size);
+
+    m_backHistory.setAutoDelete(true);
+    m_forwardHistory.setAutoDelete(true);
 }
 
 Page::~Page()
 {
+    delete m_pPixmap;
 }
 
 QString Page::title() const
@@ -47,6 +60,12 @@ QDateTime Page::lastModified() const
     return m_lastModified;
 }
 
+QPixmap* Page::pixmap() const
+
+{
+    return m_pPixmap;
+}
+
 void Page::setTitle(QString title)
 {
     m_title = title;
@@ -57,3 +76,38 @@ void Page::setLastModified(QDateTime lastModified)
     m_lastModified = lastModified;
 }
 
+bool Page::undoEnabled()
+{
+    return (!m_backHistory.isEmpty());
+}
+
+bool Page::redoEnabled()
+{
+    return (!m_forwardHistory.isEmpty());
+}
+
+void Page::backup()
+{
+    setLastModified(QDateTime::currentDateTime());
+
+    while (m_backHistory.count() >= (PAGE_BACKUPS + 1)) {
+        m_backHistory.removeFirst();
+    }
+
+    m_backHistory.append(new QPixmap(*m_pPixmap));
+    m_forwardHistory.clear();
+}
+
+void Page::undo()
+{
+    m_forwardHistory.append(new QPixmap(*m_pPixmap));
+    m_pPixmap = new QPixmap(*(m_backHistory.last()));
+    m_backHistory.removeLast();
+}
+
+void Page::redo()
+{
+    m_backHistory.append(new QPixmap(*m_pPixmap));
+    m_pPixmap = new QPixmap(*(m_forwardHistory.last()));
+    m_forwardHistory.removeLast();
+}