From d3c3c6d90a213df90d63afa736c2fab19475926f Mon Sep 17 00:00:00 2001
From: Morten <mnielsen@esri.com>
Date: Fri, 29 May 2015 09:50:14 -0700
Subject: [PATCH] Hide message tiles that doesn't have data available

---
 src/SampleApp.WinDesktop/MainWindow.xaml      | 11 +++++----
 .../NullToCollapsedConverter.cs               | 23 +++++++++++++++++++
 .../SampleApp.WinDesktop.csproj               |  1 +
 3 files changed, 30 insertions(+), 5 deletions(-)
 create mode 100644 src/SampleApp.WinDesktop/NullToCollapsedConverter.cs

diff --git a/src/SampleApp.WinDesktop/MainWindow.xaml b/src/SampleApp.WinDesktop/MainWindow.xaml
index a69cacf..8986380 100644
--- a/src/SampleApp.WinDesktop/MainWindow.xaml
+++ b/src/SampleApp.WinDesktop/MainWindow.xaml
@@ -5,6 +5,7 @@
         Title="Sample App" Height="500" Width="625">
 	<Grid>
 		<Grid.Resources>
+			<local:NullToCollapsedConverter x:Key="nullConv" />
 			<Style TargetType="UserControl" x:Key="card">
 				<Setter Property="Margin" Value="10" />
 				<Setter Property="Padding" Value="10" />
@@ -21,11 +22,11 @@
 			<TabItem Header="GPS Info">
 				<ScrollViewer HorizontalScrollBarVisibility="Disabled" Background="#FFEEEEEE">
 					<WrapPanel>
-						<local:GprmcControl x:Name="gprmcView" Style="{StaticResource card}" />
-						<local:GpggaControl x:Name="gpggaView" Style="{StaticResource card}" />
-						<local:GpgsaControl x:Name="gpgsaView" Style="{StaticResource card}" />
-						<local:GpgllControl x:Name="gpgllView" Style="{StaticResource card}" />
-						<local:PgrmeControl x:Name="pgrmeView" Style="{StaticResource card}" />
+						<local:GprmcControl x:Name="gprmcView" Style="{StaticResource card}" Visibility="{Binding Message, ElementName=gprmcView, Converter={StaticResource nullConv}}" />
+						<local:GpggaControl x:Name="gpggaView" Style="{StaticResource card}" Visibility="{Binding Message, ElementName=gpggaView, Converter={StaticResource nullConv}}" />
+						<local:GpgsaControl x:Name="gpgsaView" Style="{StaticResource card}" Visibility="{Binding Message, ElementName=gpgsaView, Converter={StaticResource nullConv}}" />
+						<local:GpgllControl x:Name="gpgllView" Style="{StaticResource card}" Visibility="{Binding Message, ElementName=gpgllView, Converter={StaticResource nullConv}}" />
+						<local:PgrmeControl x:Name="pgrmeView" Style="{StaticResource card}" Visibility="{Binding Message, ElementName=pgrmeView, Converter={StaticResource nullConv}}" />
 					</WrapPanel>
 				</ScrollViewer>
 			</TabItem>
diff --git a/src/SampleApp.WinDesktop/NullToCollapsedConverter.cs b/src/SampleApp.WinDesktop/NullToCollapsedConverter.cs
new file mode 100644
index 0000000..6155ab6
--- /dev/null
+++ b/src/SampleApp.WinDesktop/NullToCollapsedConverter.cs
@@ -0,0 +1,23 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+using System.Windows;
+using System.Windows.Data;
+
+namespace SampleApp.WinDesktop
+{
+	public sealed class NullToCollapsedConverter : IValueConverter
+	{
+		public object Convert(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture)
+		{
+			return (value == null) ? Visibility.Collapsed : Visibility.Visible;
+		}
+
+		public object ConvertBack(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture)
+		{
+			throw new NotImplementedException();
+		}
+	}
+}
diff --git a/src/SampleApp.WinDesktop/SampleApp.WinDesktop.csproj b/src/SampleApp.WinDesktop/SampleApp.WinDesktop.csproj
index 4422c96..3dc04f4 100644
--- a/src/SampleApp.WinDesktop/SampleApp.WinDesktop.csproj
+++ b/src/SampleApp.WinDesktop/SampleApp.WinDesktop.csproj
@@ -65,6 +65,7 @@
     <Compile Include="KeyValuePairControl.xaml.cs">
       <DependentUpon>KeyValuePairControl.xaml</DependentUpon>
     </Compile>
+    <Compile Include="NullToCollapsedConverter.cs" />
     <Compile Include="PgrmeControl.xaml.cs">
       <DependentUpon>PgrmeControl.xaml</DependentUpon>
     </Compile>