Brmbar v3: Support for simple GUI

All the CLI functionality implemented in the GUI.

brmbar3/brmbar-gui-qt4.py

@@ -0,0 +1,74 @@
+#!/usr/bin/python3
+
+import sys
+import psycopg2
+
+from PySide import QtCore, QtGui, QtDeclarative
+
+import brmbar
+
+
+class ShopAdapter(QtCore.QObject):
+	""" Interface between QML and the brmbar package """
+	def __init__(self):
+		QtCore.QObject.__init__(self)
+
+	@QtCore.Slot(str, result='QVariant')
+	def barcodeInput(self, barcode):
+		""" Evaluate barcode received on input
+
+		Normally, we would return just the account object, but
+		passing that to QML appears to be very non-trivial.
+		Therefore, we construct a map that we can pass around easily.
+		We return None on unrecognized barcode. """
+		barcode = str(barcode)
+		if barcode and barcode[0] == "$":
+			credits = {'$02': 20, '$05': 50, '$10': 100, '$20': 200, '$50': 500, '$1k': 1000}
+			credit = credits[barcode]
+			if credit is None:
+				return None
+			return { "acctype": "recharge", "amount": str(credit)+".00" }
+		acct = brmbar.Account.load_by_barcode(db, barcode)
+		if acct is None:
+			return None
+		if acct.acctype == 'debt':
+			map = acct.__dict__.copy()
+			map["balance"] = str(acct.balance())
+			map["negbalance"] = str(-acct.balance())
+			map["negbalance_str"] = acct.negbalance_str()
+			return map
+		elif acct.acctype == "inventory":
+			buy, sell = acct.currency.rates(currency)
+			map = acct.__dict__.copy()
+			map["price"] = str(sell)
+			return map
+		else:
+			return None
+
+	@QtCore.Slot('QVariant', 'QVariant', result='QVariant')
+	def sellItem(self, itemid, userid):
+		user = brmbar.Account.load(db, id = userid)
+		shop.sell(item = brmbar.Account.load(db, id = itemid), user = user)
+		return user.negbalance_str()
+
+	@QtCore.Slot('QVariant', 'QVariant', result='QVariant')
+	def chargeCredit(self, credit, userid):
+		user = brmbar.Account.load(db, id = userid)
+		shop.add_credit(credit = credit, user = user)
+		return user.negbalance_str()
+
+db = psycopg2.connect("dbname=brmbar")
+shop = brmbar.Shop.new_with_defaults(db)
+currency = shop.currency
+
+
+app = QtGui.QApplication(sys.argv)
+view = QtDeclarative.QDeclarativeView()
+
+ctx = view.rootContext()
+ctx.setContextProperty('shop', ShopAdapter())
+
+view.setSource('brmbar-gui-qt4/main.qml')
+
+view.show()
+app.exec_()