C# Mouse Events

Mouse Events:::

There are several kinds of mouse events: (list from an MSDN page)

• Click

This event occurs when the mouse button is released, typically before the MouseUp event. The handler for this event receives an argument of type EventArgs. Handle this event when you only need to determine when a click occurs.

• MouseClick

This event occurs when the user clicks the control with the mouse. The handler for this event receives an argument of type MouseEventArgs. Handle this event when you need to get information about the mouse when a click occurs.

• DoubleClick

This event occurs when the control is double-clicked. The handler for this event receives an argument of type EventArgs. Handle this event when you only need to determine when a double-click occurs.

• MouseDoubleClick

This event occurs when the user double-clicks the control with the mouse. The handler for this event receives an argument of type MouseEventArgs. Handle this event when you need to get information about the mouse when a double-click occurs.

• MouseDown

This event occurs when the mouse pointer is over the control and the user presses a mouse button. The handler for this event receives an argument of type MouseEventArgs.

• MouseEnter

This event occurs when the mouse pointer enters the border or client area of the control, depending on the type of control. The handler for this event receives an argument of type EventArgs.

• MouseHover

This event occurs when the mouse pointer stops and rests over the control. The handler for this event receives an argument of type EventArgs.

• MouseLeave

This event occurs when the mouse pointer leaves the border or client area of the control, depending on the type of the control. The handler for this event receives an argument of type EventArgs.

• MouseMove

This event occurs when the mouse pointer moves while it is over a control. The handler for this event receives an argument of type MouseEventArgs.

• MouseUp

This event occurs when the mouse pointer is over the control and the user releases a mouse button. The handler for this event receives an argument of type MouseEventArgs.

• MouseWheel

This event occurs when the user rotates the mouse wheel while the control has focus. The handler for this event receives an argument of type MouseEventArgs. You can use the Delta property of MouseEventArgs to determine how far the mouse has scrolled.

As you may gather, EventArgs provides less information for us than MouseEventArgs.

Example..........(1)

using System;

using System.Collections.Generic;

using System.ComponentModel;

using System.Data;

using System.Drawing;

using System.Linq;

using System.Text;

using System.Windows.Forms; 

namespace mouseeventsexample

{

    public partial class Form1 : Form

    {

        public Form1()

        {

            InitializeComponent();

        }

private void Form_MouseDown(object sender, MouseEventArgs e)

     {

      switch (e.Button)

      {

       case MouseButtons.Left:

           MessageBox.Show("Left Button Click");

           break;

       case MouseButtons.Right:

           MessageBox.Show("Right Button Click");

           break;

       default:

           break;

      }

     }

Example....(2)

using System;

using System.Collections.Generic;

using System.ComponentModel;

using System.Data;

using System.Drawing;

using System.Linq;

using System.Text;

using System.Windows.Forms;

namespace mouseeventsexample

{

    public partial class Form1 : Form

    {

        public Form1()

        {

            InitializeComponent();

        }

        private void button1_Click(object sender, EventArgs e)

        {

            textBox3.Text = (int.Parse(textBox1.Text) + int.Parse(textBox2.Text)).ToString();

        }

        private void textBox1_MouseEnter(object sender, EventArgs e)

        {

            TextBox t = (TextBox)sender;

            t.Font = new Font("Arial", 20F);

        }

        private void textBox1_MouseLeave(object sender, EventArgs e)

        {

            TextBox t = (TextBox)sender;

            t.Font = new Font("Microsoft Sans Serif", 8.25F);

        }

    }

}