从Mousehover（C＃VS）获取网格中按钮的位置

Question

in school I'm currently working on a game of battleships for AP Comp Sci and I have been trying to get it so that during the ship placing stage a picturebox (a ship) changes location to that of whichever button the mouse happens to be hovering over. This is supposed to act like a ghost icon for where you would be placing the ship. The buttons are in an array as they are made in a grid using a 2D forloop.

I couldn't figure out how to make MouseHover work with getting a buttons location from an array of buttons. This is mostly because I don't know how to give the xy values for the buttons location in the array to the MouseHover method.

I tried using a timer that checked each button in the array for whether it had focus and it changed the location of the picturebox to that button successfully:

private void MouseXYCheckTimer_Tick_1(object sender, EventArgs e)
    {
        for (int x = 0; x < 15; x++)
        {
            for (int y = 0; y < 15; y++)
            {
                if (b[x, y].Focused)
                {
                    ShipImage1.Location = b[x, y].Location;
                }
            }

        }
    }

however this required clicking the button to give it focus (thus placing the ship), defeating the purpose.

I've looked quite extensively at different posts here on MouseHover and I still cant get it to work for my problem, help would be greatly appreciated. Thanks!

Answer 1

There are built in events for handling MouseEnter

// Wire up the MouseEnter event when creating your buttons
button.MouseEnter += button_MouseEnter;

// Method that gets called
private void button_MouseEnter(object sender, EventArgs e)
{
    var button = sender as Button;
    ShipImage1.Location = button.Location;
}

Answer 2

If I understand correctly, and assuming you are using Winforms, you just need to subscribe your picture position logic to the MouseMove event of each one of your buttons. So try the following:

Define this method in your class:

private void button_MouseMove(object sender, MouseEventArgs e)
{
    ShipImage1.Location = e.Location;
}

Then in the logic responsible for creating the instance of each button stored into your b array, subscribe that method to the MouseMove event:

...
for (int x = 0; x < 15; x++)
{
    for (int y = 0; y < 15; y++)
    {
        var myButton = new Button();

        myButton.MouseMove += button_MouseMove;

        // More awesome stuff around myButton...

        b[x, y] = myButton;
    }
}
...

Also if needed, you can get the current screen mouse coordinates from the Form.MousePosition static property.

Good luck!

EDIT Or use instead the MouseEnter event as indicated by @Jerry in the other answer, that should work better.