ControlTemplate 的 ResourceDictionary 中的 WPF 事件

Question

我目前正在尝试实现一个 Metro 风格的窗口。
所以我在 ResourceDictionary 中创建了以下样式:

<ResourceDictionary xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
                    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml">

<!-- Brushes -->
<SolidColorBrush x:Key="BackgroundColor" Color="#FFFFFFFF" />

<!-- Buttons -->
<Style x:Key="MetroControlBoxButton" TargetType="Button">
    <Setter Property="Background" Value="{StaticResource BackgroundColor}" />
    <Setter Property="Template">
        <Setter.Value>
            <ControlTemplate TargetType="Button">
                <ContentPresenter />
            </ControlTemplate>
        </Setter.Value>
    </Setter>
</Style>

<!-- Windows -->
<Style x:Key="MetroWindow" TargetType="Window">
    <Setter Property="UseLayoutRounding" Value="True" />
    <Setter Property="WindowStyle" Value="None" />
    <Setter Property="ResizeMode" Value="NoResize" />
    <Setter Property="Template">
        <Setter.Value>
            <ControlTemplate TargetType="Window">
                <Grid Background="{StaticResource BackgroundColor}">
                    <Grid.RowDefinitions>
                        <RowDefinition Height="6" />
                        <RowDefinition Height="24" />
                        <RowDefinition Height="*" />
                        <RowDefinition Height="24" />
                        <RowDefinition Height="6" />
                    </Grid.RowDefinitions>
                    <Grid.ColumnDefinitions>
                        <ColumnDefinition Width="6" />
                        <ColumnDefinition Width="*" />
                        <ColumnDefinition Width="6" />
                    </Grid.ColumnDefinitions>

                    <Rectangle Name="topLeftBorderRectangle" Fill="Red" Grid.Row="0" Grid.Column="0" />
                    <Rectangle Name="topCenterBorderRectangle" Fill="Orange" Grid.Row="0" Grid.Column="1" />
                    <Rectangle Name="topRightBorderRectangle" Fill="Red" Grid.Row="0" Grid.Column="2" />
                    <Rectangle Name="middleLeftBorderRectangle" Fill="Orange" Grid.Row="1" Grid.RowSpan="3" Grid.Column="0" />
                    <Rectangle Name="middleRightBorderRectangle" Fill="Orange" Grid.Row="1" Grid.RowSpan="3" Grid.Column="2" />
                    <Rectangle Name="bottomLeftBorderRectangle" Fill="Red" Grid.Row="4" Grid.Column="0" />
                    <Rectangle Name="bottomCenterBorderRectangle" Fill="Orange" Grid.Row="4" Grid.Column="1" />
                    <Rectangle Name="bottomRightBorderRectangle" Fill="Red" Grid.Row="4" Grid.Column="2" />

                    <Rectangle Name="statusBarRectangle" Fill="Yellow" Grid.Row="3" Grid.Column="1" />

                    <Grid Grid.Row="1" Grid.Column="1">
                        <Grid.RowDefinitions>
                            <RowDefinition Height="*" />
                        </Grid.RowDefinitions>
                        <Grid.ColumnDefinitions>
                            <ColumnDefinition Width="Auto" />
                            <ColumnDefinition Width="*"/>
                            <ColumnDefinition Width="28" />
                            <ColumnDefinition Width="28" />
                            <ColumnDefinition Width="28" />
                        </Grid.ColumnDefinitions>

                        <Rectangle Name="dragRectangle" Fill="Yellow" Grid.Row="0" Grid.Column="1" />
                        <Button Name="minimizeButton" Content="_" Grid.Row="0" Grid.Column="2" Style="{StaticResource MetroControlBoxButton}" Command="{Binding Path=DataContext.MinimizeCommand, RelativeSource={RelativeSource FindAncestor, AncestorType={x:Type Window}}}" />
                        <Button Name="maximizeButton" Content="[]"  Grid.Row="0" Grid.Column="3" Style="{StaticResource MetroControlBoxButton}" Command="{Binding Path=DataContext.MaximizeNormalizeCommand, RelativeSource={RelativeSource FindAncestor, AncestorType={x:Type Window}}}" />
                        <Button Name="closeButton" Content="X" Grid.Row="0" Grid.Column="4" Style="{StaticResource MetroControlBoxButton}" Command="{Binding Path=DataContext.CloseCommand, RelativeSource={RelativeSource FindAncestor, AncestorType={x:Type Window}}}" />
                    </Grid>

                    <ContentPresenter Grid.Row="2" Grid.Column="1" />
                </Grid>
            </ControlTemplate>
        </Setter.Value>
    </Setter>
</Style>

</ResourceDictionary>

我的问题是我不知道如何实现 de drag 功能。
我的 dragRectangle 没有 Command 属性，那么如何使用 MVVM 在 Rectangle 上的 MouseLeftButtonDown 上调用 DragMove()？

谢谢

Answer 1

ResourceDictionary 可以像 Windows 等一样包含代码，因此您可以添加事件处理程序并调用 DragMove从那里

设置后面的代码需要几个步骤。

如果您的 ResourceDictionary 名为 MetroStyleResourceDictionary.xaml在 Visual Studio 中添加一个名为 MetroStyleResourceDictionary.xaml.cs 的相同文件夹中的新文件

文件后面的代码应该如下所示

public partial class MetroStyleResourceDictionary
{
    //...
}

之后您需要添加 x:Class Xaml 文件的属性

<ResourceDictionary x:Class="YourNamespace.MetroStyleResourceDictionary"
                    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
                    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml">
    <!--...-->
</ResourceDictionary>

现在您可以为 MouseLeftButtonDown 添加一个事件处理程序到dragRectangle。 .您还需要获取 Window所以绑定(bind)到 Tag可能是个好主意

<Rectangle Name="dragRectangle"
           MouseLeftButtonDown="dragRectangle_MouseLeftButtonDown"
           Tag="{Binding RelativeSource={RelativeSource AncestorType={x:Type Window}}}"
           .../>

最后，您可以将事件处理程序添加到文件后面的代码中，如下所示

public partial class MetroStyleResourceDictionary
{
    void dragRectangle_MouseLeftButtonDown(object sender, System.Windows.Input.MouseButtonEventArgs e)
    {
        Rectangle dragRectangle = sender as Rectangle;
        Window window = dragRectangle.Tag as Window;
        if (window != null)
        {
            window.DragMove();
        }
    }
}