Implementation proposal

The solution tries to be a bit more generic:

- four buttons are there to synchronize coordinates
- three buttons to snap p1, p2 and auto-measure from p1.

src/laybasic/laybasic/layEditable.h

@@ -331,7 +331,7 @@ public:
    *  by the caller. The return value is 0 if the Editable object does
    *  not support a properties page.
    */
-  virtual lay::PropertiesPage *properties_page (QWidget * /*parent*/)
+  virtual lay::PropertiesPage *properties_page (db::Manager * /*manager*/, QWidget * /*parent*/)
   {
     return 0;
   }

src/laybasic/laybasic/layProperties.cc

@@ -27,8 +27,8 @@
 namespace lay
 {
 
-PropertiesPage::PropertiesPage (QWidget *parent, lay::Editable *editable)
-  : QFrame (parent), mp_editable (editable)
+PropertiesPage::PropertiesPage (QWidget *parent, db::Manager *manager, lay::Editable *editable)
+  : QFrame (parent), mp_manager (manager), mp_editable (editable)
 {
   //  .. nothing else ..
 }

src/laybasic/laybasic/layProperties.h

@@ -57,7 +57,7 @@ public:
    *  empty, at_start () is supposed to return true then.
    *  The dialog will call update () to update the display accordingly.
    */
-  PropertiesPage (QWidget *parent, lay::Editable *editable);
+  PropertiesPage (QWidget *parent, db::Manager *manager, lay::Editable *editable);
 
   /**
    *  @brief The destructor
@@ -210,7 +210,17 @@ public:
     return mp_editable;
   }
 
+  /**
+   *  @brief Gets the transaction manager object
+   *  Use this object to implement undable operations on the properties page.
+   */
+  db::Manager *manager ()
+  {
+    return mp_manager;
+  }
+
 private:
+  db::Manager *mp_manager;
   lay::Editable *mp_editable;
 };
 

src/laybasic/laybasic/layPropertiesDialog.cc

@@ -46,7 +46,7 @@ PropertiesDialog::PropertiesDialog (QWidget * /*parent*/, db::Manager *manager,
   mp_stack = new QStackedLayout;
 
   for (lay::Editables::iterator e = mp_editables->begin (); e != mp_editables->end (); ++e) {
-    mp_properties_pages.push_back (e->properties_page (content_frame));
+    mp_properties_pages.push_back (e->properties_page (mp_manager, content_frame));
     if (mp_properties_pages.back ()) {
       mp_stack->addWidget (mp_properties_pages.back ());
     }