MouseWheel non récupéré

**tlaurent** · 14/02/2011, 12h57

Bonjour,

Je n'arrive pas à récupérer l'événement MouseWheel sur un panel. L'exécution ne passe pas dans le MouseWheel pourtant mon code me semble correct (abonnement, etc, ...). Il doit manquer quelque chose d'important mais je ne trouve pas quoi ???

D'avance merci.

Voici mon code :

Code :

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namespace TESTS
{
    partial class Form2
    {
        /// <summary>
        /// Variable nécessaire au concepteur.
        /// </summary>
        private System.ComponentModel.IContainer components = null;
 
        /// <summary>
        /// Nettoyage des ressources utilisées.
        /// </summary>
        /// <param name="disposing">true si les ressources managées doivent être supprimées*; sinon, false.</param>
        protected override void Dispose(bool disposing)
        {
            if (disposing && (components != null))
            {
                components.Dispose();
            }
            base.Dispose(disposing);
        }
 
        #region Code généré par le Concepteur Windows Form
 
        /// <summary>
        /// Méthode requise pour la prise en charge du concepteur - ne modifiez pas
        /// le contenu de cette méthode avec l'éditeur de code.
        /// </summary>
        private void InitializeComponent()
        {
            this.panel1 = new System.Windows.Forms.Panel();
            this.SuspendLayout();
            // 
            // panel1
            // 
            this.panel1.BorderStyle = System.Windows.Forms.BorderStyle.FixedSingle;
            this.panel1.Location = new System.Drawing.Point(64, 86);
            this.panel1.Name = "panel1";
            this.panel1.Size = new System.Drawing.Size(374, 215);
            this.panel1.TabIndex = 0;
            this.panel1.Tag = true;
            this.panel1.MouseWheel += new System.Windows.Forms.MouseEventHandler(panel1_MouseWheel);
            // 
            // Form2
            // 
            this.AutoScaleDimensions = new System.Drawing.SizeF(6F, 13F);
            this.AutoScaleMode = System.Windows.Forms.AutoScaleMode.Font;
            this.ClientSize = new System.Drawing.Size(515, 420);
            this.Controls.Add(this.panel1);
            this.Name = "Form2";
            this.Tag = true;
            this.Text = "Form2";
            this.ResumeLayout(false);
 
        }
 
 
        void panel1_MouseWheel(object sender, System.Windows.Forms.MouseEventArgs e)
        {
            throw new System.Exception("The method or operation is not implemented.");
        }
 
        #endregion
 
        private System.Windows.Forms.Panel panel1;
    }
}

**theMonz31** · 14/02/2011, 14h10

salut

une solution:

Le code suivant fonctionne:

Code :

Sélectionner tout - Visualiser dans une fenêtre à part

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public partial class ExtPanel : Panel
    {
        const int WM_MOUSEWHEEL = 0x020A;
        public ExtPanel()
        {
            InitializeComponent();
            SetStyle(ControlStyles.Selectable, true);
            SetStyle(ControlStyles.UserMouse, true);
        }
        protected override void OnMouseWheel(MouseEventArgs e)
        {
            Trace.WriteLine("Mouse Wheel");
            base.OnMouseWheel(e);
        }
    }

**tlaurent** · 14/02/2011, 16h53

Merci TheMonz21 pour ta réponse mais je souhaite rester dans un contexte d'abonnement aux événements.

Microsoft donne un exemple basé sur le même principe que le mien (il utilise l'abonnement et n'utilise pas OnMouseWheel) et il fonctionne, mais je ne vois aucune vraie différence entre leur exemple et mon code (pourtant elle est forcément quelque part).
Je cherche donc ce qui manque dans mon code pour que ça fonctionne.

Code de Microsoft :

Code :

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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();
        }
    }
}

**Graffito** · 14/02/2011, 21h45

Bien que l'event MouseWheel soit défini pour un Panel, je pense que cet event ne sera jamais activé car le Panel ne peut pas recevoir le Focus.

**theMonz31** · 15/02/2011, 18h21

Je t'ai donné une solution... et elle répond à ton besoin...

Le Panel ne gère pas le Mousewheel (c'est pour cela qu'on ne le voit pas dans les Event exposés par la fenetre de propriété).

L'event existe par défaut car le Panel hérite d'un control qui possède le MouseWheel mais sans ScrollBar, pas de mouseWheel...

A toi de voir si avoir une solution est quelque chose de concevable ou si tu préfères chercher autre chose "qui n'existe" à priori pas...

Au pire, tu te crées ton propre panel qui intègre ma solution et qui expose le MouseWheel..

**tlaurent** · 16/02/2011, 14h54

Merci pour ces informations.

Je viens de trouver la solution à mon problème : comme dit Graffito

, il faut que le Panel ait le focus (il peut l'avoir en mettant par exemple dans le code de MonPanel_MouseEnter la ligne MonPanel.Pocus() ) pour qu'il réagisse au MouseWheel (avec abonnement) et c'est bon.

Merci pour votre aide,
Thierry

MouseWheel non récupéré

C#

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