优化下载中列表UI

DownKyi/Languages/Default.xaml

@@ -103,6 +103,7 @@
     <system:String x:Key="MixedFlow">混流中……</system:String>
     <system:String x:Key="Pausing">暂停中……</system:String>
     <system:String x:Key="Waiting">等待中……</system:String>
+    <system:String x:Key="DownloadFailed">下载失败</system:String>
 
     <system:String x:Key="TotalDownloading1">正在下载</system:String>
     <system:String x:Key="TotalDownloading2">个视频！</system:String>

DownKyi/Views/DownloadManager/ViewDownloading.xaml

@@ -95,18 +95,29 @@
                                             <ColumnDefinition />
                                         </Grid.ColumnDefinitions>
 
-                                        <TextBlock
-                                            Grid.Column="0"
-                                            HorizontalAlignment="Left"
-                                            FontSize="12"
-                                            Foreground="{DynamicResource BrushTextDark}">
-                                            <TextBlock.Text>
-                                                <MultiBinding StringFormat="{}{0} {1}">
-                                                    <Binding Path="DownloadContent" />
-                                                    <Binding Path="DownloadStatusTitle" />
-                                                </MultiBinding>
-                                            </TextBlock.Text>
-                                        </TextBlock>
+                                        <StackPanel Grid.Column="0" Orientation="Horizontal">
+                                            <TextBlock
+                                                HorizontalAlignment="Left"
+                                                FontSize="12"
+                                                Foreground="{DynamicResource BrushTextDark}"
+                                                Text="{Binding DownloadContent}" />
+                                            <TextBlock
+                                                HorizontalAlignment="Left"
+                                                FontSize="12"
+                                                Foreground="{DynamicResource BrushTextDark}">
+
+                                                <TextBlock.Style>
+                                                    <Style TargetType="{x:Type TextBlock}">
+                                                        <Setter Property="Text" Value="{Binding StringFormat={} {0}, Path=DownloadStatusTitle}" />
+                                                        <Style.Triggers>
+                                                            <DataTrigger Binding="{Binding DownloadContent}" Value="">
+                                                                <Setter Property="Text" Value="{Binding DownloadStatusTitle}" />
+                                                            </DataTrigger>
+                                                        </Style.Triggers>
+                                                    </Style>
+                                                </TextBlock.Style>
+                                            </TextBlock>
+                                        </StackPanel>
 
                                         <TextBlock
                                             Grid.Column="1"