MouseEventHandler Temsilci

Tanım

Ad Alanı:

System.Windows.Forms

Bütünleştirilmiş Kod:

System.Windows.Forms.dll

Kaynak:

MouseEventHandler.cs

Formun, denetimin veya başka bir bileşenin MouseDown, MouseUpveya MouseMove olayını işleyecek yöntemi temsil eder.

C#

public delegate void MouseEventHandler(object? sender, MouseEventArgs e);

Parametreler

sender

Object

Olayın kaynağı.

e

MouseEventArgs

MouseEventArgs Olay verilerini içeren bir.

Örnekler

Aşağıdaki kod örneği, üzerinde farenin yolunu çizmek için farklı fare Panelolayları kullanmayı gösterir. Her MouseMove biri ve MouseDown gerçekleşen olaylar için öğesine bir çizgi kesimi eklenirGraphicsPath. Grafikleri güncelleştirmek için yöntemi Invalidate her MouseDown ve MouseUp olayında için Panel çağrılır. Ayrıca, olay gerçekleştiğinde grafik yolu yukarı veya aşağı MouseWheel kaydırılır. gibi MouseHoverek fare olayları da ekranda tanımlanır. Ayrıca, sınıftan fare SystemInformation hakkında ek bilgiler ekranda görüntülenir.

C#

using System;
using System.Drawing;
using System.Windows.Forms;

namespace MouseEvent
{
    public class Form1 : System.Windows.Forms.Form
    {
        private System.Windows.Forms.Panel panel1;
        private System.Windows.Forms.Label label1;
        private System.Windows.Forms.Label label2;
        private System.Windows.Forms.Label label3;
        private System.Windows.Forms.Label label4;
        private System.Windows.Forms.Label label5;
        private System.Windows.Forms.Label label6;
        private System.Windows.Forms.Label label7;
        private System.Windows.Forms.Label label8;
        private System.Windows.Forms.Label label9;
        private System.Windows.Forms.Button clearButton;
        private System.Drawing.Drawing2D.GraphicsPath mousePath;
        private System.Windows.Forms.GroupBox groupBox1;

        private int fontSize = 20;        

        [STAThread]
        static void Main() 
        {
            Application.Run(new Form1());
        }

        public Form1()
        {            
            mousePath = new System.Drawing.Drawing2D.GraphicsPath();

            this.panel1 = new System.Windows.Forms.Panel();
            this.label1 = new System.Windows.Forms.Label();
            this.clearButton = new System.Windows.Forms.Button();
            this.label2 = new System.Windows.Forms.Label();
            this.label3 = new System.Windows.Forms.Label();
            this.label4 = new System.Windows.Forms.Label();
            this.label5 = new System.Windows.Forms.Label();
            this.label6 = new System.Windows.Forms.Label();
            this.label7 = new System.Windows.Forms.Label();
            this.label8 = new System.Windows.Forms.Label();
            this.label9 = new System.Windows.Forms.Label();
            this.groupBox1 = new System.Windows.Forms.GroupBox();

            // Mouse Events Label
            this.label1.Location = new System.Drawing.Point(24, 504);
            this.label1.Size = new System.Drawing.Size(392, 23);
            // DoubleClickSize Label
            this.label2.AutoSize = true;
            this.label2.Location = new System.Drawing.Point(24, 48);
            this.label2.Size = new System.Drawing.Size(35, 13);
            // DoubleClickTime Label
            this.label3.AutoSize = true;
            this.label3.Location = new System.Drawing.Point(24, 72);
            this.label3.Size = new System.Drawing.Size(35, 13);
            // MousePresent Label
            this.label4.AutoSize = true;
            this.label4.Location = new System.Drawing.Point(24, 96);
            this.label4.Size = new System.Drawing.Size(35, 13);
            // MouseButtons Label
            this.label5.AutoSize = true;
            this.label5.Location = new System.Drawing.Point(24, 120);
            this.label5.Size = new System.Drawing.Size(35, 13);
            // MouseButtonsSwapped Label
            this.label6.AutoSize = true;
            this.label6.Location = new System.Drawing.Point(320, 48);
            this.label6.Size = new System.Drawing.Size(35, 13);
            // MouseWheelPresent Label
            this.label7.AutoSize = true;
            this.label7.Location = new System.Drawing.Point(320, 72);
            this.label7.Size = new System.Drawing.Size(35, 13);
            // MouseWheelScrollLines Label
            this.label8.AutoSize = true;
            this.label8.Location = new System.Drawing.Point(320, 96);
            this.label8.Size = new System.Drawing.Size(35, 13);
            // NativeMouseWheelSupport Label
            this.label9.AutoSize = true;
            this.label9.Location = new System.Drawing.Point(320, 120);
            this.label9.Size = new System.Drawing.Size(35, 13);

            // Mouse Panel
            this.panel1.Anchor = ((System.Windows.Forms.AnchorStyles.Top | System.Windows.Forms.AnchorStyles.Left) 
                | System.Windows.Forms.AnchorStyles.Right);
            this.panel1.BackColor = System.Drawing.SystemColors.ControlDark;
            this.panel1.Location = new System.Drawing.Point(16, 160);
            this.panel1.Size = new System.Drawing.Size(664, 320);
            this.panel1.MouseUp += new System.Windows.Forms.MouseEventHandler(this.panel1_MouseUp);
            this.panel1.Paint += new System.Windows.Forms.PaintEventHandler(this.panel1_Paint);
            this.panel1.MouseEnter += new System.EventHandler(this.panel1_MouseEnter);
            this.panel1.MouseHover += new System.EventHandler(this.panel1_MouseHover);
            this.panel1.MouseMove += new System.Windows.Forms.MouseEventHandler(this.panel1_MouseMove);
            this.panel1.MouseLeave += new System.EventHandler(this.panel1_MouseLeave);
            this.panel1.MouseDown += new System.Windows.Forms.MouseEventHandler(this.panel1_MouseDown);
            this.panel1.MouseWheel += new System.Windows.Forms.MouseEventHandler(this.panel1_MouseWheel);

            // Clear Button
            this.clearButton.Anchor = (System.Windows.Forms.AnchorStyles.Top | System.Windows.Forms.AnchorStyles.Right);
            this.clearButton.Location = new System.Drawing.Point(592, 504);
            this.clearButton.TabIndex = 1;
            this.clearButton.Text = "Clear";
            this.clearButton.Click += new System.EventHandler(this.clearButton_Click);
            
            // GroupBox
            this.groupBox1.Anchor = ((System.Windows.Forms.AnchorStyles.Top | System.Windows.Forms.AnchorStyles.Left) 
                | System.Windows.Forms.AnchorStyles.Right);
            this.groupBox1.Location = new System.Drawing.Point(16, 24);
            this.groupBox1.Size = new System.Drawing.Size(664, 128);
            this.groupBox1.Text = "System.Windows.Forms.SystemInformation";

            // Set up how the form should be displayed and add the controls to the form.
            this.ClientSize = new System.Drawing.Size(696, 534);
            this.Controls.AddRange(new System.Windows.Forms.Control[] {
                                        this.label9,this.label8,this.label7,this.label6,
                                        this.label5,this.label4,this.label3,this.label2,
                                        this.clearButton,this.panel1,this.label1,this.groupBox1});
            this.Text = "Mouse Event Example";

            // Displays information about the system mouse.
            label2.Text = "SystemInformation.DoubleClickSize: " + SystemInformation.DoubleClickSize.ToString();
            label3.Text = "SystemInformation.DoubleClickTime: " + SystemInformation.DoubleClickTime.ToString();
            label4.Text = "SystemInformation.MousePresent: " + SystemInformation.MousePresent.ToString();
            label5.Text = "SystemInformation.MouseButtons: " + SystemInformation.MouseButtons.ToString();
            label6.Text = "SystemInformation.MouseButtonsSwapped: " + SystemInformation.MouseButtonsSwapped.ToString();
            label7.Text = "SystemInformation.MouseWheelPresent: " + SystemInformation.MouseWheelPresent.ToString();
            label8.Text = "SystemInformation.MouseWheelScrollLines: " + SystemInformation.MouseWheelScrollLines.ToString();
            label9.Text = "SystemInformation.NativeMouseWheelSupport: " + SystemInformation.NativeMouseWheelSupport.ToString();
        }

        private void panel1_MouseDown(object sender, System.Windows.Forms.MouseEventArgs e) 
        {
            // Update the mouse path with the mouse information
            Point mouseDownLocation = new Point(e.X, e.Y);

            string eventString = null;
            switch (e.Button) {
                case MouseButtons.Left:
                    eventString = "L";
                    break;
                case MouseButtons.Right:
                    eventString = "R";
                    break;
                case MouseButtons.Middle:
                    eventString = "M";
                    break;
                case MouseButtons.XButton1:
                    eventString = "X1";
                    break;
                case MouseButtons.XButton2:
                    eventString = "X2";
                    break;
                case MouseButtons.None:
                default:
                    break;
            }

            if (eventString != null) 
            {
                mousePath.AddString(eventString, FontFamily.GenericSerif, (int)FontStyle.Bold, fontSize, mouseDownLocation, StringFormat.GenericDefault);
            }
            else 
            {
                mousePath.AddLine(mouseDownLocation,mouseDownLocation);
            }
            panel1.Focus();
            panel1.Invalidate();
        }

        private void panel1_MouseEnter(object sender, System.EventArgs e) 
        {
            // Update the mouse event label to indicate the MouseEnter event occurred.
            label1.Text = sender.GetType().ToString() + ": MouseEnter";
        }

        private void panel1_MouseHover(object sender, System.EventArgs e) 
        {
            // Update the mouse event label to indicate the MouseHover event occurred.
            label1.Text = sender.GetType().ToString() + ": MouseHover";
        }

        private void panel1_MouseLeave(object sender, System.EventArgs e) 
        {
            // Update the mouse event label to indicate the MouseLeave event occurred.
            label1.Text = sender.GetType().ToString() + ": MouseLeave";
        }

        private void panel1_MouseMove(object sender, System.Windows.Forms.MouseEventArgs e)
        {
            // Update the mouse path that is drawn onto the Panel.
            int mouseX = e.X;
            int mouseY = e.Y;
            
            mousePath.AddLine(mouseX,mouseY,mouseX,mouseY);
        }

        private void panel1_MouseWheel(object sender, System.Windows.Forms.MouseEventArgs e)
        {
            // Update the drawing based upon the mouse wheel scrolling.
      
            int numberOfTextLinesToMove = e.Delta * SystemInformation.MouseWheelScrollLines / 120;
            int numberOfPixelsToMove = numberOfTextLinesToMove * fontSize;

            if (numberOfPixelsToMove != 0) {
                System.Drawing.Drawing2D.Matrix translateMatrix = new  System.Drawing.Drawing2D.Matrix();
                translateMatrix.Translate(0, numberOfPixelsToMove);
                mousePath.Transform(translateMatrix);
            }
            panel1.Invalidate();
        }
        private void panel1_MouseUp(object sender, System.Windows.Forms.MouseEventArgs e) 
        {
            Point mouseUpLocation = new System.Drawing.Point(e.X, e.Y);
        
            // Show the number of clicks in the path graphic.
            int numberOfClicks = e.Clicks;
            mousePath.AddString("    " + numberOfClicks.ToString(), 
                        FontFamily.GenericSerif, (int)FontStyle.Bold, 
                        fontSize, mouseUpLocation, StringFormat.GenericDefault);

            panel1.Invalidate();
        }

        private void panel1_Paint(object sender, System.Windows.Forms.PaintEventArgs e) 
        {    
            // Perform the painting of the Panel.
            e.Graphics.DrawPath(System.Drawing.Pens.DarkRed, mousePath);
        }

        private void clearButton_Click(object sender, System.EventArgs e)
        {
            // Clear the Panel display.
            mousePath.Dispose();
            mousePath = new System.Drawing.Drawing2D.GraphicsPath();
            panel1.Invalidate();
        }
    }
}

Açıklamalar

Bir MouseEventHandler temsilci oluşturduğunuzda, olayı işleyecek yöntemi tanımlarsınız. Olayı olay işleyicinizle ilişkilendirmek için olaya temsilcinin bir örneğini ekleyin. Olay her gerçekleştiğinde, olay işleyici (siz temsilciyi kaldırmadığınız sürece) çağrılır. Olayları temsilcilerle işleme hakkında daha fazla bilgi için bkz. Olayları İşleme ve Oluşturma.

Uzantı Metotları

Şunlara uygulanır

Ayrıca bkz.

• OnMouseDown(MouseEventArgs)
• MouseDown
• MouseDown
• OnMouseUp(MouseEventArgs)
• MouseUp
• MouseUp
• OnMouseMove(MouseEventArgs)
• MouseMove
• MouseMove
• MouseEventArgs