覆盖自定义 WPF 窗口的内容

Question

我创建了这个派生自 Window 的 TinyWindow 类。

  public class TinyWindow : Window
    {
        public TinyWindow()
    {
        
         Grid grid = new Grid();
         grid.RowDefinitions.Add(new RowDefinition() { Height = new GridLength(50, GridUnitType.Pixel) });
         grid.RowDefinitions.Add(new RowDefinition() { Height = new GridLength(1, GridUnitType.Star) });
                        
         ContentControl contentControl = new ContentControl();
         contentControl.SetBinding(ContentControl.ContentProperty, new Binding(nameof(WindowContent)) { Source = this });
         Grid.SetRow(contentControl, 1);
         grid.Children.Add(contentControl);

         Content = grid;        
        
    }
    
     public object WindowContent
        {
            get { return (object)GetValue(WindowContentProperty); }
            set { SetValue(WindowContentProperty, value); }
        }

        // Using a DependencyProperty as the backing store for WindowContent.  This enables animation, styling, binding, etc...
        public static readonly DependencyProperty WindowContentProperty =
            DependencyProperty.Register("WindowContent", typeof(object), typeof(TinyWindow), new PropertyMetadata(null));
    
    }

所以我可以在 xaml 中像这样使用它。

    <controls:TinyWindow x:Class="MyProject.Windows.SomeTinyWindow"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
        xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
        xmlns:local="clr-namespace:MyProject.Windows"
        xmlns:controls="clr-namespace:MyProject.Controls"
        mc:Ignorable="d"
        Title="Select a Port">
    <controls:TinyWindow.WindowContent>
       <TextBlock Text="this is my content"/>
    </controls:TinyWindow.WindowContent>
</controls:TinyWindow >

效果很好。但我想只写这个来达到同样的结果。

    <controls:TinyWindow x:Class="MyProject.Windows.SomeTinyWindow"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
        xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
        xmlns:local="clr-namespace:MyProject.Windows"
        xmlns:controls="clr-namespace:MyProject.Controls"
        mc:Ignorable="d"
        Title="Select a Port">
       <TextBlock Text="this is my content"/>
</controls:TinyWindow>

我怎样才能做到这一点？覆盖内容属性？我试过了，但是 base.Content 在这里是空的。

public new object Content
{
    get { return base.Content; }
    set
    {
        var grid = base.Content as Grid;
        //some logic to add value to gris
    }
}

你有什么建议？

Answer 1

您不需要声明具有附加 Content 属性的派生 Window 类。只需声明一个窗口

ControlTemplate

，例如在 Application.Resources

<ControlTemplate x:Key="TinyWindowTemplate" TargetType="Window">
    <Grid Background="{TemplateBinding Background}">
        <Grid.RowDefinitions>
            <RowDefinition Height="50"/>
            <RowDefinition Height="*"/>
        </Grid.RowDefinitions>
        <ContentControl Grid.Row="1" Content="{TemplateBinding Content}"/>
    </Grid>
</ControlTemplate>

并像这样使用它：

<Window ... Template="{StaticResource TinyWindowTemplate}">
    <TextBlock Text="this is my content"/>
</Window>

ControlTemplate 也可以是 Window

Style

资源的一部分。