下载列表添加无数据显示

DownKyi/Converter/CountConverter.cs

@@ -0,0 +1,21 @@
+using System;
+using System.Globalization;
+using System.Windows.Data;
+
+namespace DownKyi.Converter
+{
+    public class CountConverter : IValueConverter
+    {
+        public int Count { get; set; }
+
+        public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
+        {
+            return ((int)value) > Count;
+        }
+
+        public object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture)
+        {
+            throw new NotImplementedException();
+        }
+    }
+}

DownKyi/DownKyi.csproj

@@ -79,6 +79,7 @@
       <Generator>MSBuild:Compile</Generator>
       <SubType>Designer</SubType>
     </ApplicationDefinition>
+    <Compile Include="Converter\CountConverter.cs" />
     <Compile Include="CustomControl\GifImage.cs" />
     <Compile Include="Events\MessageEvent.cs" />
     <Compile Include="Events\NavigationEvent.cs" />
@@ -447,6 +448,7 @@
       <CopyToOutputDirectory>PreserveNewest</CopyToOutputDirectory>
     </Content>
     <Resource Include="Resources\checked.png" />
+    <Resource Include="Resources\nodata02.png" />
     <Content Include="打不开DownKyi请点我.txt">
       <CopyToOutputDirectory>PreserveNewest</CopyToOutputDirectory>
     </Content>

DownKyi/Views/DownloadManager/ViewDownloading.xaml

@@ -2,10 +2,13 @@
     x:Class="DownKyi.Views.DownloadManager.ViewDownloading"
     xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
     xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
+    xmlns:converter="clr-namespace:DownKyi.Converter"
     xmlns:i="http://schemas.microsoft.com/xaml/behaviors"
     xmlns:prism="http://prismlibrary.com/"
     prism:ViewModelLocator.AutoWireViewModel="True">
     <UserControl.Resources>
+        <converter:CountConverter x:Key="CountConverter" Count="0" />
+
         <Style x:Key="DownloadingStyle" TargetType="{x:Type ListBoxItem}">
             <Setter Property="Template">
                 <Setter.Value>
@@ -225,6 +228,21 @@
                 <RowDefinition Height="1" />
                 <RowDefinition Height="50" />
             </Grid.RowDefinitions>
+            <Grid.Style>
+                <Style TargetType="{x:Type Grid}">
+                    <Style.Triggers>
+                        <DataTrigger Binding="{Binding DownloadingList}" Value="{x:Null}">
+                            <Setter Property="Visibility" Value="Collapsed" />
+                        </DataTrigger>
+                        <DataTrigger Binding="{Binding DownloadingList.Count}" Value="0">
+                            <Setter Property="Visibility" Value="Collapsed" />
+                        </DataTrigger>
+                        <DataTrigger Binding="{Binding DownloadingList.Count, Converter={StaticResource CountConverter}}" Value="true">
+                            <Setter Property="Visibility" Value="Visible" />
+                        </DataTrigger>
+                    </Style.Triggers>
+                </Style>
+            </Grid.Style>
 
             <ListBox
                 Grid.Row="0"
@@ -316,5 +334,25 @@
         </Grid>
 
         <!--  TODO 没有数据时显示图片或文字  -->
+        <Image
+            Width="256"
+            Height="256"
+            Source="/DownKyi;component/Resources/nodata02.png">
+            <Image.Style>
+                <Style TargetType="{x:Type Image}">
+                    <Style.Triggers>
+                        <DataTrigger Binding="{Binding DownloadingList}" Value="{x:Null}">
+                            <Setter Property="Visibility" Value="Visible" />
+                        </DataTrigger>
+                        <DataTrigger Binding="{Binding DownloadingList.Count}" Value="0">
+                            <Setter Property="Visibility" Value="Visible" />
+                        </DataTrigger>
+                        <DataTrigger Binding="{Binding DownloadingList.Count, Converter={StaticResource CountConverter}}" Value="true">
+                            <Setter Property="Visibility" Value="Collapsed" />
+                        </DataTrigger>
+                    </Style.Triggers>
+                </Style>
+            </Image.Style>
+        </Image>
     </Grid>
 </UserControl>