separate core and gui in different modules

gui/history_widget.py

@@ -0,0 +1,26 @@
+from PyQt4.QtGui import *
+from i18n import _
+
+class HistoryWidget(QTreeWidget):
+
+    def __init__(self, parent=None):
+        QTreeWidget.__init__(self, parent)
+        self.setColumnCount(2)
+        self.setHeaderLabels([_("Amount"), _("To / From"), _("When")])
+        self.setIndentation(0)
+
+    def empty(self):
+        self.clear()
+
+    def append(self, address, amount, date):
+        if address is None:
+          address = _("Unknown")
+        if amount is None: 
+          amount = _("Unknown")
+        if date is None:
+          date = _("Unknown")
+        item = QTreeWidgetItem([amount, address, date])
+        if float(amount) < 0:
+          item.setForeground(0, QBrush(QColor("#BC1E1E")))
+        self.insertTopLevelItem(0, item)
+