Mouse events not fired

Question

I'm making a C# WinForms application. The MouseMove and MouseClick events of the form aren't getting fired for some reason. (I'm probably going to feel like an idiot when I find out why.) It is a transparent form (TransparencyKey is set to the background colour) with a semi-transparent animated gif in a Picture Box. I am making a screensaver. Any suggestions?

EDIT: MainScreensaver.cs

    Random randGen = new Random();
    public MainScreensaver(Rectangle bounds)
    {
        InitializeComponent();
        this.Bounds = Bounds;
    }

    private void timer1_Tick(object sender, EventArgs e)
    {
        Rectangle screen = Screen.PrimaryScreen.Bounds;
        Point position = new Point(randGen.Next(0,screen.Width-this.Width)+screen.Left,randGen.Next(0,screen.Height-this.Height)+screen.Top);
        this.Location = position;
    }

    private void MainScreensaver_Load(object sender, EventArgs e)
    {
        Cursor.Hide();
        TopMost = true;
    }
    private Point mouseLocation;

    private void MainScreensaver_MouseMove(object sender, MouseEventArgs e)
    {
        if (!mouseLocation.IsEmpty)
        {
            // Terminate if mouse is moved a significant distance
            if (Math.Abs(mouseLocation.X - e.X) > 5 ||
                Math.Abs(mouseLocation.Y - e.Y) > 5)
                Application.Exit();
        }

        // Update current mouse location
        mouseLocation = e.Location;
    }

    private void MainScreensaver_KeyPress(object sender, KeyPressEventArgs e)
    {
        Application.Exit();
    }

    private void MainScreensaver_Deactive(object sender, EventArgs e)
    {
        Application.Exit();
    }

    private void MainScreensaver_MouseClick(object sender, MouseEventArgs e)
    {
        Application.Exit();
    }

Excerpt from MainScreensaver.Designer.cs InitialiseComponent()

    this.MouseClick += new System.Windows.Forms.MouseEventHandler(this.MainScreensaver_MouseClick);
    this.MouseMove += new System.Windows.Forms.MouseEventHandler(this.MainScreensaver_MouseMove);

Answer 1

This isn't an answer to you question, but I'm leaving this answer in case anyone else stumbles upon this question while trying to debug this same issue (which is how I got here)

In my case, I had a class that was derived from Form.

I was also using TransparencyKey.

Some things I noticed

• The events will not fire on the transparent parts of the form.
• The events will not fire if the mouse cursor is over another control on the form.
• The events will not fire if you override WndProc and set the result of a WM_NCHITTEST message. Windows doesn't even send out the corresponding mouse messages that would cause the .NET events.

My Solution

In my constructor, I had forgotten to call InitializeComponent().

Which was where the event handlers were being bound to my controls.

Events were not firing because the handlers were not being bound.

Answer 2

Are you sure that your form has focus? If your form does not have focus, the mouse events will not be fired.