Description
If one want to know the location of the mouse and whether the button is clicked or not, then should be familiar with Mouse Events. Mouse Events are used to know the details of the mouse.
When the user interacts with the system through mouse, then the mouse events are raised. Each mouse event requires an object called sender and MouseEventArgs as arguments.
Steps
To see the mouse events follow the below steps.
Step 1
Create new windows application. Click on the form1 which is the default one. Then, properties of the form will be displayed in the properties window.
Click on the Events Symbol as shown in the below figure. Then, that's going to bring the events window.
Step 2
See the Mouse events as shown in the above figure. Now, click on the white space beside the MouseDown, MouseUp and MouseMove events to raise the events.
Then, the properties window will looks as shown in the below figure.
Step 3
Form1.cs will get the events and the code generates as shown in the below.
[csharp]
private void Form1_MouseDown(object sender, MouseEventArgs e)
{
}
private void Form1_MouseUp(object sender, MouseEventArgs e)
{
}
private void Form1_MouseMove(object sender, MouseEventArgs e)
{
}
[/csharp]
Step 4
Now, write the code as shown in below.
[csharp]
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;
namespace WindowsFormsApplication26
{
public partial class Form1 : Form
{
Boolean draw;
public Form1()
{
InitializeComponent();
}
private void Form1_Load(object sender, EventArgs e)
{
}
private void Form1_MouseDown(object sender, MouseEventArgs e)
{
draw = true;
}
private void Form1_MouseMove(object sender, MouseEventArgs e)
{
if(draw==true)
{
using(Graphics paint=CreateGraphics())
{
paint.FillRectangle(new SolidBrush(Color.Blue),e.X,e.Y,4,4);
}
}
else
{
using (Graphics paint = CreateGraphics())
{
paint.FillEllipse(new SolidBrush(Color.Blue), e.X, e.Y, 4, 4);
}
}
}
private void Form1_MouseUp(object sender, MouseEventArgs e)
{
draw = false;
}
}
}
[/csharp]
Step 5
Press f5 to run the application.
If one move the mouse, then it will draw as shown in the below figure. Here MouseUp event is raised.
Step 6
If one click on the mouse and move the mouse. Then it will draw as shown in the below figure. Here MouseDown event is raised.
