Multiple MouseHover events in a Control

Question

I'm trying to implement a custom control in C# and I need to get events when the mouse is hovered. I know there is the MouseHover event but it only fires once. To get it to fire again I need to take the mouse of the control and enter it again.

Is there any way I can accomplish this?

Answer 1

Why not subscribe to the MouseMove events in the MouseHover event, then unsubscribe in the MouseLeave event

Edit:

One way to determine if the mouse is stopped would be to start a timer every time you get a mouse move event, when the timer has elapsed then you could consider the mouse stopped. The reason for removing the MouseMove events on MouseLeave would allow you to only receive events while the mouse is over your control.

Answer 2

Let's define "stops moving" as "remains within an x pixel radius for n ms".

Subscribe to the MouseMove event and use a timer (set to n ms) to set your timeout. Each time the mouse moves, check against the tolerance. If it's outside your tolerance, reset the timer and record a new origin.

Pseudocode:

Point lastPoint;
const float tolerance = 5.0;

//you might want to replace this with event subscribe/unsubscribe instead
bool listening = false;

void OnMouseOver()
{
    lastpoint = Mouse.Location;
    timer.Start();
    listening = true; //listen to MouseMove events
}

void OnMouseLeave()
{
    timer.Stop();
    listening = false; //stop listening
}

void OnMouseMove()
{
    if(listening)
    {
        if(Math.abs(Mouse.Location - lastPoint) > tolerance)
        {
            //mouse moved beyond tolerance - reset timer
            timer.Reset();
            lastPoint = Mouse.Location;
        }
    }
}

void timer_Tick(object sender, EventArgs e)
{
    //mouse "stopped moving"
}

Answer 3

I realize that this is an old topic but I wanted to share a way I found to do it: on the mouse move event call ResetMouseEventArgs() on the control that catches the event.

Answer 4

Thanx! ResetMouseEventArgs() was the solution.