WPF中的可拖动的无边界窗口和按钮单击处理程序

Question

The Button handler doesnt work because of the DragMove call in Window mouse down handler. Is there any way how to let the events bubbling? I tried set up e.Handled to false, but it does not work.

public partial class MainWindow : Window
{
    public MainWindow()
    {
        InitializeComponent();                    
    }

    private void Window_MouseDown(object sender, MouseButtonEventArgs e)
    {    
        this.DragMove();
        e.Handled = false;
    }   

    private void Button_Click(object sender, RoutedEventArgs e)
    {
        System.Console.WriteLine("zde");
    }
}

Answer 1

The Button handler doesnt work because of the DragMove call

Actually, it doesn't work, because the first fires is an event at the Button.Click , and when it works, it conflicts with the events like: MouseLeftButtonDown, MouseUp, MouseDown and for routed events e.Handled property is false by default.

To make this work, you need to define an PreviewMouseDown event, but it's a Tunnel event, this means that it will go down of the VisualTree hierarchy, therefore it is triggered before the Bubble events.

Example:

XAML

<Window x:Class="MyProject.MainWindow"
        ...
        PreviewMouseDown="Window_PreviewMouseDown" ... />

Code-behind

private void Window_PreviewMouseDown(object sender, MouseButtonEventArgs e)
{
    if (e.ChangedButton == MouseButton.Left)
        this.DragMove();
}