Question

Is there a way to use a mouse click and drag in wpf? I have disabled the borders on my app within the xaml code but in the code behind im trying to do something like this:

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Data;
using System.Windows.Documents;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Imaging;
using System.Windows.Navigation;
using System.Windows.Shapes;


namespace WpfApplication1
{
    /// <summary>
    /// Interaction logic for MainWindow.xaml
    /// </summary>
    public partial class MainWindow : Window
    {
        private Size? _mouseGrabOffset;


        public MainWindow()
        {
            InitializeComponent(); 
        }
        protected override void OnMouseDown(MouseEventArgs e)
        {
            if (e.Button == System.Windows.Forms.MouseButtons.Right)
                _mouseGrabOffset = new Size(e.Location);
            if (e.Button == System.Windows.Forms.MouseButtons.Left)
                _mouseGrabOffset = new Size(e.Location);
            base.OnMouseDown(e);
        }
        protected override void OnMouseUp(MouseEventArgs e)
        {
            _mouseGrabOffset = null;

            base.OnMouseUp(e);
        }

        protected override void OnMouseMove(MouseEventArgs e)
        {
            if (_mouseGrabOffset.HasValue)
            {
                this.Location = Cursor.Position - _mouseGrabOffset.Value;
            }

            base.OnMouseMove(e);
        }

Basically because my borders and title bar is disabled this code should allow control of the application anywhere where i click.

I just cant get it to work because this is based on windows forms.

EDIT

If I try this I get a definition error but im unsure how else to handle it:

public partial class MainWindow : Window
{
    private Size? _mouseGrabOffset;


    public MainWindow()
    {
        InitializeComponent();
        this.MouseDown += new MouseButtonEventHandler(MainWindow_OnMouseDown);

    }
    void MainWindow_OnMouseDown(object sender, MouseEventArgs e)
    {
        if (e.LeftButton != MouseButtonState.Pressed)
            _mouseGrabOffset = new Size(e.Location);
            base.OnMouseMove(e);
    }
    protected override void OnMouseMove(MouseEventArgs e)
    {
        if (_mouseGrabOffset.HasValue)
        {
            this.Location = Cursor.Position - _mouseGrabOffset.Value;
        }

        base.OnMouseMove(e);
    }

RE EDIT

So I have now tryed a new method as mentioned below but still nothing.

public partial class MainWindow : Window
{
    //private Size? _mouseGrabOffset;


    public MainWindow()
    {
        InitializeComponent();
        //this.MouseDown += new MouseButtonEventHandler(MainWindow_OnMouseDown);

    }
    public enum MouseButtonType 
    {
        Left,
        Middle,
        Right,
        XButton1,
        XButton2,

    }
    protected override void OnMouseDown(MouseButtonEventArgs e)
    {
        base.OnMouseDown(e);
    }
    protected override void OnPreviewMouseDown(MouseButtonEventArgs e)
    {
        base.OnPreviewMouseDown(e);
    }

Answer 1

In your Window’s code behind you override OnMouseDown and/or OnPreviewMouseDown

protected override void OnMouseDown(MouseButtonEventArgs e)
{
    base.OnMouseDown(e);
}
protected override void OnPreviewMouseDown(MouseButtonEventArgs e)
{
    base.OnPreviewMouseDown(e);
}

Second, check the MouseButtonEventArgs ChangedButton property to determine which Button was pressed.
public enum MouseButton (Left, Middle, Right, XButton1, XButton2}
The relevant namespace is System.Windows.Input; System.Windows.Forms is incorrect.

Your Window should not subscribe to its own events as previously suggested. Use the overrides.
this.MouseDown += new MouseButtonEventHandler(MainWindow_OnMouseDown); // Incorrect