Csharp/CSharp Tutorial/GUI Windows Forms/Mouse Event

Mouse Button Left clicked

using System;
using System.Drawing;
using System.Windows.Forms;
   
class MouseConnect: Form
{
     const int iMaxPoints = 1000;
     int       iNumPoints = 0;
     Point[]   apoint     = new Point[iMaxPoints];
   
     public static void Main()
     {
          Application.Run(new MouseConnect());
     }
     public MouseConnect()
     {
     }
     protected override void OnMouseDown(MouseEventArgs mea)
     {
          if (mea.Button == MouseButtons.Left)
          {
               iNumPoints = 0;
               Invalidate();
          }
     }
     protected override void OnMouseMove(MouseEventArgs mea)
     {
          if (mea.Button == MouseButtons.Left)
          {
               apoint[iNumPoints++] = new Point(mea.X, mea.Y);
   
               Graphics grfx = CreateGraphics();
               grfx.DrawLine(new Pen(ForeColor), mea.X, mea.Y, 
                                                 mea.X, mea.Y + 1);
               grfx.Dispose();
          }
     }
     protected override void OnMouseUp(MouseEventArgs mea)
     {
          if (mea.Button == MouseButtons.Left)
               Invalidate();
     }
     protected override void OnPaint(PaintEventArgs pea)
     {
          Graphics grfx = pea.Graphics;
          Pen      pen  = new Pen(ForeColor);
   
          for (int i = 0   ; i < iNumPoints - 1; i++)
               for (int j = i + 1; j < iNumPoints; j++)
                    grfx.DrawLine(pen, apoint[i], apoint[j]);
    }
}

Mouse Enter / Hover / Leave

using System;
using System.Drawing;
using System.Windows.Forms;
public class MouseEnterHoverLeave : Form
{
  private Button btn;
  string str = "";
  public MouseEnterHoverLeave()
  {
    Size = new Size(400,400);
    btn = new Button();
    btn.Parent = this;
    btn.Location = new Point(50,50);
    btn.Size = new Size(150,25);
    btn.MouseEnter += new System.EventHandler(btn_MouseEnter);
    btn.MouseHover += new System.EventHandler(btn_MouseHover);
    btn.MouseLeave += new System.EventHandler(btn_MouseLeave);
  }
  static void Main() 
  {
    Application.Run(new MouseEnterHoverLeave());
  }
  private void btn_MouseEnter(object sender, EventArgs e)
  {
    btn.Text = "MouseEnter";
  }
  private void btn_MouseHover(object sender, EventArgs e)
  {
    btn.Text = "MouseHover";
  }
  private void btn_MouseLeave(object sender, EventArgs e)
  {
    btn.Text = "MouseLeave";
  }
  protected override void OnMouseEnter(EventArgs e)
  {
    base.OnMouseEnter(e);
    Console.WriteLine("Form MouseEnter");
  }
  protected override void OnMouseHover(EventArgs e)
  {
    base.OnMouseHover(e);
    Console.WriteLine("Form MouseHover");
  }
  protected override void OnMouseLeave(EventArgs e)
  {
    base.OnMouseLeave(e);
    Console.WriteLine("Form MouseLeave");
  }
}

Mouse event handlers

using System;
using System.Drawing;
using System.Windows.Forms;
public class MouseEvents : Form
{
  private Label lbl;
  public MouseEvents()
  {
    Size = new Size(400,600);
    lbl = new Label();
    lbl.Parent = this;
    lbl.Location = new Point(50,50);
    lbl.Size = new Size(150,25);
    lbl.BorderStyle = BorderStyle.Fixed3D;
    lbl.MouseEnter += new System.EventHandler(lbl_MouseEnter);
    lbl.MouseHover += new System.EventHandler(lbl_MouseHover);
    lbl.MouseLeave += new System.EventHandler(lbl_MouseLeave);
    lbl.MouseDown += new System.Windows.Forms.MouseEventHandler(lbl_MouseDown);
    lbl.MouseMove += new System.Windows.Forms.MouseEventHandler(lbl_MouseMove);
    lbl.MouseUp += new System.Windows.Forms.MouseEventHandler(lbl_MouseUp);
    lbl.MouseWheel += new System.Windows.Forms.MouseEventHandler(lbl_MouseWheel);
    lbl.Click += new System.EventHandler(lbl_Click);
    lbl.DoubleClick += new System.EventHandler(lbl_DoubleClick);
  }
  static void Main() 
  {
    Application.Run(new MouseEvents());
  }
  private void btnReset_Click(object sender, EventArgs e)
  {
    lbl.Text = "";
  }
  private void lbl_MouseEnter(object sender, EventArgs e)
  {
    lbl.Text = "MouseEnter";
    TextBoxDraw("Label MouseEnter");
  }
  private void lbl_MouseHover(object sender, EventArgs e)
  {
    lbl.Text = "MouseHover";
    TextBoxDraw("Label MouseHover");
  }
  private void lbl_MouseLeave(object sender, EventArgs e)
  {
    lbl.Text = "MouseLeave";
    TextBoxDraw("Label MouseLeave");
  }
  private void lbl_MouseDown(object sender, MouseEventArgs e)
  {
    lbl.Text = "MouseDown";
    string str;
    str = "Label MouseDown";
    str += "\r\n\tButton:  " + e.Button.ToString();
    str += "\r\n\tClicks:  " + e.Clicks.ToString();
    str += "\r\n\tDelta:  " + e.Delta.ToString();
    str += "\r\n\tX:  " + e.X.ToString();
    str += "\r\n\tY:  " + e.Y.ToString();
    TextBoxDraw(str);
  }
  private void lbl_MouseMove(object sender, MouseEventArgs e)
  {
    lbl.Text = "MouseMove";
    string str;
    str = "Label MouseMove";
    str += "\r\n\tButton:  " + e.Button.ToString();
    str += "\r\n\tClicks:  " + e.Clicks.ToString();
    str += "\r\n\tDelta:  " + e.Delta.ToString();
    str += "\r\n\tX:  " + e.X.ToString();
    str += "\r\n\tY:  " + e.Y.ToString();
    TextBoxDraw(str);
  }
  private void lbl_MouseUp(object sender, MouseEventArgs e)
  {
    lbl.Text = "MouseUp";
    string str;
    str = "Label MouseUp";
    str += "\r\n\tButton:  " + e.Button.ToString();
    str += "\r\n\tClicks:  " + e.Clicks.ToString();
    str += "\r\n\tDelta:  " + e.Delta.ToString();
    str += "\r\n\tX:  " + e.X.ToString();
    str += "\r\n\tY:  " + e.Y.ToString();
    TextBoxDraw(str);
  }
  private void lbl_MouseWheel(object sender, MouseEventArgs e)
  {
    lbl.Text = "MouseWheel";
    string str;
    str = "Label MouseWheel";
    str += "\r\n\tButton:  " + e.Button.ToString();
    str += "\r\n\tClicks:  " + e.Clicks.ToString();
    str += "\r\n\tDelta:  " + e.Delta.ToString();
    str += "\r\n\tX:  " + e.X.ToString();
    str += "\r\n\tY:  " + e.Y.ToString();
    TextBoxDraw(str);
  }
  private void lbl_Click(object sender, EventArgs e)
  {
    lbl.Text = "Click";
    TextBoxDraw("Label Click");
  }
  private void lbl_DoubleClick(object sender, EventArgs e)
  {
    lbl.Text = "DoubleClick";
    TextBoxDraw("Label DoubleClick");
  }
  protected override void OnMouseEnter(EventArgs e)
  {
    base.OnMouseEnter(e);
    TextBoxDraw("Form MouseEnter");
  }
  protected override void OnMouseHover(EventArgs e)
  {
    base.OnMouseHover(e);
    TextBoxDraw("Form MouseHover");
  }
  protected override void OnMouseLeave(EventArgs e)
  {
    base.OnMouseLeave(e);
    TextBoxDraw("Form MouseLeave");
  }
  private void TextBoxDraw(string str){
      Console.WriteLine(str);
  }
}

Mouse Event information

using System;
using System.Drawing;
using System.Windows.Forms;
public class MainClass{
  static void Main() 
  {
    Console.WriteLine("DoubleClickSize"+ SystemInformation.DoubleClickSize.ToString());
    Console.WriteLine("DoubleClickTime"+SystemInformation.DoubleClickTime.ToString());
    Console.WriteLine("MouseButtons"+SystemInformation.MouseButtons.ToString());
    Console.WriteLine("MouseButtonsSwapped"+SystemInformation.MouseButtonsSwapped.ToString());
    Console.WriteLine("MousePresent"+SystemInformation.MousePresent.ToString());
    Console.WriteLine("MouseWheelPresent"+SystemInformation.MouseWheelPresent.ToString());
    Console.WriteLine("MouseWheelScrollLines"+SystemInformation.MouseWheelScrollLines.ToString());
    Console.WriteLine("NativeMouseWheelSupport"+SystemInformation.NativeMouseWheelSupport.ToString());
  }
}

DoubleClickSize{Width=4, Height=4}
DoubleClickTime500
MouseButtons5
MouseButtonsSwappedFalse
MousePresentTrue
MouseWheelPresentTrue
MouseWheelScrollLines3
NativeMouseWheelSupportTrue

Mouse Properties

using System;
using System.Drawing;
using System.Windows.Forms;
public class MouseProperties : Form
{
  private Label lbl;
  int i = 0;
  Cursor[] theCursors = {Cursors.AppStarting, 
              Cursors.Arrow, 
              Cursors.Hand, 
              Cursors.Help, 
              Cursors.No};
  public MouseProperties()
  {
    Size = new Size(400,600);
    lbl = new Label();
    lbl.Parent = this;
    lbl.Location = new Point(50,50);
    lbl.Size = new Size(150,25);
    lbl.BorderStyle = BorderStyle.Fixed3D;
    lbl.MouseEnter += new System.EventHandler(lbl_MouseEnter);
    lbl.MouseHover += new System.EventHandler(lbl_MouseHover);
    lbl.MouseLeave += new System.EventHandler(lbl_MouseLeave);
    lbl.MouseDown += new System.Windows.Forms.MouseEventHandler(lbl_MouseDown);
    lbl.MouseMove += new System.Windows.Forms.MouseEventHandler(lbl_MouseMove);
    lbl.MouseUp += new System.Windows.Forms.MouseEventHandler(lbl_MouseUp);
    lbl.MouseWheel += new System.Windows.Forms.MouseEventHandler(lbl_MouseWheel);
    lbl.Click += new System.EventHandler(lbl_Click);
    lbl.DoubleClick += new System.EventHandler(lbl_DoubleClick);
  }
  static void Main() 
  {
    Application.Run(new MouseProperties());
  }
  private void lbl_MouseEnter(object sender, EventArgs e)
  {
    lbl.Text = "MouseEnter";
    EventArgsStrings();
    lbl.Cursor = Cursors.WaitCursor;
  }
  private void lbl_MouseHover(object sender, EventArgs e)
  {
    lbl.Cursor = theCursors[i % 5];
    i++;
    lbl.Text = "MouseHover";
    EventArgsStrings();
    Console.WriteLine("Label MouseHover");
  }
  private void lbl_MouseLeave(object sender, EventArgs e)
  {
    lbl.Text = "MouseLeave";
    EventArgsStrings();
    Console.WriteLine("Label MouseLeave");
  }
  private void lbl_MouseDown(object sender, MouseEventArgs e)
  {
    lbl.Text = "MouseDown";
    MouseEventArgsStrings(e);
    Console.WriteLine("Label MouseDown");
  }
  private void lbl_MouseMove(object sender, MouseEventArgs e)
  {
    lbl.Text = "MouseMove";
    MouseEventArgsStrings(e);
    Console.WriteLine("Label MouseMove");
  }
  private void lbl_MouseUp(object sender, MouseEventArgs e)
  {
    lbl.Text = "MouseUp";
    MouseEventArgsStrings(e);
    Console.WriteLine("Label MouseUp");
  }
  private void lbl_MouseWheel(object sender, MouseEventArgs e)
  {
    lbl.Text = "MouseWheel";
    MouseEventArgsStrings(e);
    Console.WriteLine("Label MouseWheel");
  }
  private void lbl_Click(object sender, EventArgs e)
  {
    lbl.Text = "Click";
    EventArgsStrings();
    Console.WriteLine("Label Click");
  }
  private void lbl_DoubleClick(object sender, EventArgs e)
  {
    lbl.Text = "DoubleClick";
    EventArgsStrings();
    Console.WriteLine("Label DoubleClick");
  }
  private void EventArgsStrings()
  {
    string str;
    str = "\tCursor:  " + lbl.Cursor.ToString();
    str += "\r\n\tCapture:  " + lbl.Capture.ToString();
    str += "\r\n\tMouseButtons:  " + MouseButtons.ToString();
    str += "\r\n\tMousePosition:  " + MousePosition.ToString();
    str += "\r\n\tModifierKeys:  " + ModifierKeys.ToString();
    Console.WriteLine(str);
  }
  private void MouseEventArgsStrings(MouseEventArgs e)
  {
    string str;
    str = "\tButton:  " + e.Button.ToString();
    str += "\r\n\tClicks:  " + e.Clicks.ToString();
    str += "\r\n\tDelta:  " + e.Delta.ToString();
    str += "\r\n\tX:  " + e.X.ToString();
    str += "\r\n\tY:  " + e.Y.ToString();
    Console.WriteLine(str);
  }
}