Show a warning if computer is not connected to AC power.

.gitmodules

@@ -0,0 +1,3 @@
+[submodule "Cura/util/Power"]
+	path = Cura/util/Power
+	url = git://github.com/GreatFruitOmsk/Power.git

Cura/gui/printWindow.py

@@ -11,6 +11,7 @@ from gui import taskbar
 from util import machineCom
 from util import profile
 from util import gcodeInterpreter
+from util import power
 
 printWindowMonitorHandle = None
 
@@ -116,6 +117,17 @@ class printWindow(wx.Frame):
 		
 		sb = wx.StaticBox(self.panel, label="Statistics")
 		boxsizer = wx.StaticBoxSizer(sb, wx.VERTICAL)
+
+		p = power.PowerManagement()
+		if p.get_providing_power_source_type() != power.POWER_TYPE_AC:
+			self.powerWarningText = wx.StaticText(parent=self.panel,
+				id=-1,
+				label="Connect your computer to AC power\nIf it shuts down during printing, the product will be lost.",
+				style=wx.ALIGN_CENTER)
+			self.powerWarningText.SetBackgroundColour('red')
+			self.powerWarningText.SetForegroundColour('white')
+			boxsizer.AddF(self.powerWarningText, flags=wx.SizerFlags().Expand().Border(wx.BOTTOM, 10))
+
 		self.statsText = wx.StaticText(self.panel, -1, "Filament: ####.##m #.##g\nEstimated print time: #####:##\nMachine state:\nDetecting baudrateXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX")
 		boxsizer.Add(self.statsText, flag=wx.LEFT, border=5)
 		

Cura/util/Power

@@ -0,0 +1 @@
+Subproject commit 9630adf08ee2de90cb3a49af53d85693060ccbff

Cura/util/__init__.py

@@ -0,0 +1,7 @@
+import sys
+import os
+
+
+sys.path.append(os.path.join(os.path.dirname(os.path.abspath(__file__)), 'Power'))
+
+import power