CodeCompletion window is empty when no EmptyText is set.

git-svn-id: svn://svn.sharpdevelop.net/sharpdevelop/trunk@5907 1ccf3a8d-04fe-1044-b7c0-cef0b8235c61

src/AddIns/DisplayBindings/AvalonEdit.AddIn/AvalonEdit.AddIn.csproj

@@ -146,6 +146,7 @@
     <Compile Include="Src\SharpDevelopCompletionWindow.cs" />
     <Compile Include="Src\SharpDevelopInsightWindow.cs">
     </Compile>
+    <Compile Include="Src\StringToVisibilityConverter.cs" />
     <Compile Include="Src\SyntaxModeDoozer.cs" />
     <Compile Include="Src\TextMarkerService.cs" />
     <EmbeddedResource Include="Resources\IncrementalSearchCursor.cur" />

src/AddIns/DisplayBindings/AvalonEdit.AddIn/Src/SharpDevelopCompletionWindow.xaml

@@ -6,6 +6,8 @@
 	Style="{x:Static core:GlobalStyles.WindowStyle}"
 >
 	<Window.Resources>
+		<local:StringToVisibilityConverter x:Key="StringToVisibilityConverter" />
+		
 		<Style TargetType="cc:CompletionListBox" BasedOn="{StaticResource {x:Type ListBox}}">
 			<Style.Triggers>
 				<DataTrigger
@@ -18,7 +20,9 @@
 								<TextBlock Text="{Binding EmptyText, RelativeSource={RelativeSource AncestorType={x:Type local:SharpDevelopCompletionWindow}, AncestorLevel=1}}"
 								           FontStyle="Italic" 
 								           Foreground="{DynamicResource {x:Static SystemColors.GrayTextBrushKey}}" 
-								           TextWrapping="WrapWithOverflow"/>
+								           TextWrapping="WrapWithOverflow"
+											Visibility="{Binding EmptyText, RelativeSource={RelativeSource AncestorType={x:Type local:SharpDevelopCompletionWindow}, AncestorLevel=1}, 
+															Converter={StaticResource StringToVisibilityConverter}}" />
 							</ControlTemplate>
 						</Setter.Value>
 					</Setter>

src/AddIns/DisplayBindings/AvalonEdit.AddIn/Src/StringToVisibilityConverter.cs

@@ -0,0 +1,29 @@
+// <file>
+//     <copyright see="prj:///doc/copyright.txt"/>
+//     <license see="prj:///doc/license.txt"/>
+//     <owner name="Martin Konicek" email="martin.konicek@gmail.com"/>
+//     <version>$Revision: $</version>
+// </file>
+using System;
+using System.Globalization;
+using System.Windows;
+using System.Windows.Data;
+
+namespace ICSharpCode.AvalonEdit.AddIn
+{
+	[ValueConversion(typeof(string), typeof(Visibility))]
+    public class StringToVisibilityConverter : IValueConverter
+    {
+        public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
+        {
+        	if (!(value is string))
+        		return value == null ? Visibility.Collapsed : Visibility.Visible;
+        	return string.IsNullOrEmpty((string)value) ? Visibility.Collapsed : Visibility.Visible;
+        }
+
+        public object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture)
+        {
+            return null;
+        }
+    }
+}