Copy amount to clipboard (implements #657)

- Also, unify similar code related to copying transaction fields to clipboard

src/qt/guiutil.h

@@ -9,6 +9,7 @@ class QLineEdit;
 class QWidget;
 class QDateTime;
 class QUrl;
+class QAbstractItemView;
 QT_END_NAMESPACE
 class SendCoinsRecipient;
 
@@ -35,6 +36,15 @@ public:
     // HTML escaping for rich text controls
     static QString HtmlEscape(const QString& str, bool fMultiLine=false);
     static QString HtmlEscape(const std::string& str, bool fMultiLine=false);
+
+    /** Copy a field of the currently selected entry of a view to the clipboard. Does nothing if nothing
+        is selected.
+       @param[in] column  Data column to extract from the model
+       @param[in] role    Data role to extract from the model
+       @see  TransactionView::copyLabel, TransactionView::copyAmount, TransactionView::copyAddress
+     */
+    static void copyEntryData(QAbstractItemView *view, int column, int role=Qt::EditRole);
+
 };
 
 #endif // GUIUTIL_H