Add conditional user auth panel before ChangeToAddPrinter

- Completed first pass at completing User is prompted to login in printer setup wizard if they are not signed in
 - Invoke delegate and show login prompt based on whether or not they are currently signed in.
 - Fixes #825

PrinterControls/PrinterConnections/ShowAuthPanel.cs

@@ -0,0 +1,68 @@
+/*
+Copyright (c) 2016, Greg Diaz
+All rights reserved.
+
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions are met:
+
+1. Redistributions of source code must retain the above copyright notice, this
+   list of conditions and the following disclaimer.
+2. Redistributions in binary form must reproduce the above copyright notice,
+   this list of conditions and the following disclaimer in the documentation
+   and/or other materials provided with the distribution.
+
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
+ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
+WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR
+ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+(INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
+ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+The views and conclusions contained in the software and documentation are those
+of the authors and should not be interpreted as representing official policies,
+either expressed or implied, of the FreeBSD Project.
+*/
+
+using MatterHackers.Agg.UI;
+using MatterHackers.MatterControl.CustomWidgets;
+
+namespace MatterHackers.MatterControl.PrinterControls.PrinterConnections
+{
+	public class ShowAuthPanel : SetupConnectionWidgetBase
+	{
+		public ShowAuthPanel(WizardWindow connectionWizard) : base(connectionWizard)
+		{
+
+			TextWidget userLoginPromptLabel = new TextWidget("Would you like to sign in to access your cloud\nprinter profiles?")
+			{
+				PointSize = 12,
+				TextColor = ActiveTheme.Instance.PrimaryTextColor,
+			};
+			contentRow.AddChild(userLoginPromptLabel);
+
+			var nextButton = textImageButtonFactory.Generate("Skip");
+			nextButton.Name = "Connection Wizard Skip Sign In Button";
+			nextButton.Click += (sender, e) =>
+			{
+				connectionWizard.ChangeToAddPrinter();
+			};
+
+			var signInButton = textImageButtonFactory.Generate("Sign In");
+			signInButton.Name = "Sign In From Connection Wizard Button";
+			signInButton.Click += (s, e) =>
+			{ 
+				WizardWindow.ShowAuthDialog?.Invoke();
+				UiThread.RunOnIdle(connectionWizard.Close);
+	
+			};
+
+			footerRow.AddChild(nextButton);
+			footerRow.AddChild(new HorizontalSpacer());
+			footerRow.AddChild(signInButton);
+		}
+	}
+}