WPF 制作聊天窗口获取历史聊天记录

 

腾讯从QQ2013版起开始在聊天记录里添加了历史记录查看功能，个人聊天窗口可以点击最上边的‘查看历史消息’，而群组里的未读消息可以通过滚动鼠标中键或者拖动滚动条加载更多消息，那这个用wpf怎么实现呢？

我用Scrollviewer和RichTextBox做了一个简陋尝试，真的是太陋了，大家戴好眼镜了哈。现在开始：

 

首先是前台的陋XAML：

<Window x:Class="testFlowDocument.MainWindow"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        Title="MainWindow" Height="350" Width="525" Loaded="Window_Loaded">
    <Grid>
        <ScrollViewer x:Name="sv_richtextbox" Background="Transparent" PreviewMouseLeftButtonUp="sv_richtextbox_PreviewMouseLeftButtonUp"
                   PreviewMouseWheel="sv_richtextbox_PreviewMouseWheel"      VerticalScrollBarVisibility="Auto" ScrollChanged="sv_richtextbox_ScrollChanged">
             <RichTextBox IsReadOnly="True" x:Name="RichTextBoxMessageHistory" BorderBrush="#B7D9ED" 
                          Margin="3,3,3,0" Background="Silver" />
             
        </ScrollViewer>
        <Button Name="previousadd" Content="前加" Height="30" Width="100" VerticalAlignment="Bottom" HorizontalAlignment="Left" Click="previousadd_Click"></Button>
        <Button Name="clearadd" Content="清空" Height="30" Width="100" VerticalAlignment="Bottom" Click="clearadd_Click"></Button>
        <Button Name="add20" Content="加20条" Height="30" Width="50" VerticalAlignment="Bottom" Margin="0,0,110,0" HorizontalAlignment="Right" Click="add20_Click"></Button>
        <Button Name="lastadd" Content="后加" Height="30" Width="100" VerticalAlignment="Bottom" HorizontalAlignment="Right" Click="lastadd_Click"></Button>
    </Grid>
</Window>

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