Wpf拖放应用程序

Question

我是 WPF 新手，我正在尝试在我的应用程序中开发拖放功能。我有两个用户控件 Window1 和 Window2。

如何通过仅单击橙色区域来启用任何此用户控件的拖放功能。只有用户控件的橙色区域应启用拖放功能。灰色区域不应该启用拖放功能。 我的意思是，如果我们要拖动用户控件，那么我们必须单击橙色区域，灰色区域也会随之拖动。如果我们点击灰色区域，那么用户控件不应该移动。

请查看下面的图片，这将有助于理解问题。

https://www.dropbox.com/sh/wj9mcbyi9wpcxgq/AAAb9r_aWxKm2Eah3PrT__5sa?dl=0

提前致谢。

Answer 1

如果你想自己做，那么你可以在这里使用我的实现：https://stackoverflow.com/a/17014906/145757

否则，您可以检查 Blend SDK，其中包括 MouseDragElementBehavior。

Answer 2

非常感谢@Pragmateek 的帮助，它就像一个魅力。下面是我实现的代码。

我有一个用户控件UCDragme，它有一个专用的橙色拖动区域TBDragme。

<UserControl x:Class="NSR3.UCDragme"
         xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
         xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
         xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006" 
         xmlns:d="http://schemas.microsoft.com/expression/blend/2008" 
         mc:Ignorable="d" 
         d:DesignHeight="500" d:DesignWidth="300">
    <Grid Background="Gray">
        <Grid.RowDefinitions>
            <RowDefinition Height="Auto" />
            <RowDefinition Height="Auto" />
            <RowDefinition Height="*" />
        </Grid.RowDefinitions>
        <TextBlock Background="Orange" x:Name="TBDragme" Text="Dragme" />
        <TextBlock Grid.Column="0" Grid.Row="1" Grid.RowSpan="2" Background="AliceBlue" Margin="20" Text="No drag"></TextBlock>
   </Grid>
</UserControl>

主窗口Home：

<Window x:Class="NSR3.Home"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    Title="Home"
    xmlns:nsr="clr-namespace:NSR3">
    <Grid>
        <Grid.RowDefinitions>
            <RowDefinition Height="*" />
            <RowDefinition Height="Auto" />
        </Grid.RowDefinitions>
        <Canvas x:Name="panel">
        </Canvas>
        <Button Content="Add" Grid.Row="1" Grid.Column="0" Click="Button_Click" />
    </Grid>
</Window>

Home窗口代码隐藏中的拖放引擎：

using System.Windows;
using System.Windows.Controls;
using System.Windows.Input;
using System.Windows.Media;

namespace NSR3
{
/// <summary>
/// Interaction logic for Home.xaml
/// </summary>
public partial class Home : Window
{
    UCDragme box;
    public Home()
    {
        InitializeComponent();

        box = new UCDragme();

        TextBlock tb = (TextBlock)box.FindName("TBDragme");

        tb.MouseLeftButtonDown += box_MouseLeftButtonDown;
        tb.MouseLeftButtonUp += box_MouseLeftButtonUp;
        tb.MouseMove += box_MouseMove;

        panel.Children.Add(box);
    }

    private void Button_Click(object sender, RoutedEventArgs e)
    {
        box = new UCDragme();

        TextBlock tb=(TextBlock)box.FindName("TBDragme");

        tb.MouseLeftButtonDown += box_MouseLeftButtonDown;
        tb.MouseLeftButtonUp += box_MouseLeftButtonUp;
        tb.MouseMove += box_MouseMove;

        panel.Children.Add(box);
    }

    private TextBlock draggedBox;
    private Point clickPosition;

    private void box_MouseLeftButtonDown(object sender, MouseButtonEventArgs e)
    {
        draggedBox = sender as TextBlock;
        clickPosition = e.GetPosition(draggedBox);
        draggedBox.CaptureMouse();
    }

    private void box_MouseLeftButtonUp(object sender, MouseButtonEventArgs e)
    {
        draggedBox.ReleaseMouseCapture();
        draggedBox = null;
        //box = null;
    }

    private void box_MouseMove(object sender, MouseEventArgs e)
    {
        if (draggedBox != null)
        {
            Point currentPosition = e.GetPosition(panel);

            box.RenderTransform = draggedBox.RenderTransform as TranslateTransform ?? new TranslateTransform();

            TranslateTransform transform = box.RenderTransform as TranslateTransform;

            transform.X = currentPosition.X - clickPosition.X - draggedBox.Margin.Left;
            transform.Y = currentPosition.Y - clickPosition.Y - draggedBox.Margin.Right;
        }
    }

}
}