Control.MouseEnter Ereignis (System.Windows.Forms) (2023)

public: event EventHandler ^ MouseEnter;

public event EventHandler MouseEnter;

public event EventHandler? MouseEnter;

member this.MouseEnter : EventHandler 

Public Custom Event MouseEnter As EventHandler 

Ereignistyp

EventHandler

Beispiele

Im folgenden Codebeispiel wird die Verwendung verschiedener Mausereignisse veranschaulicht, um den Pfad der Maus auf einem Panelzu zeichnen. Für jedes MouseMove auftretende Ereignis und MouseDown wird ein GraphicsPath Zeilensegment hinzugefügt. Um die Grafiken zu aktualisieren, wird die Invalidate -Methode für jedes PanelMouseDown Ereignis und MouseUp aufgerufen. Darüber hinaus wird der Grafikpfad nach oben oder unten gescrollt, wenn das MouseWheel Ereignis auftritt. Zusätzliche Mausereignisse, z. B MouseHover. , werden ebenfalls auf dem Bildschirm identifiziert. Auf dem Bildschirm werden auch zusätzliche Informationen zur Maus aus der SystemInformation Klasse angezeigt.

#using <System.dll>#using <System.Windows.Forms.dll>#using <System.Drawing.dll>using namespace System;using namespace System::Drawing;using namespace System::Windows::Forms;namespace MouseEvent{ public ref class Form1: public System::Windows::Forms::Form { private: System::Windows::Forms::Panel^ panel1; System::Windows::Forms::Label ^ label1; System::Windows::Forms::Label ^ label2; System::Windows::Forms::Label ^ label3; System::Windows::Forms::Label ^ label4; System::Windows::Forms::Label ^ label5; System::Windows::Forms::Label ^ label6; System::Windows::Forms::Label ^ label7; System::Windows::Forms::Label ^ label8; System::Windows::Forms::Label ^ label9; System::Windows::Forms::Button^ clearButton; System::Drawing::Drawing2D::GraphicsPath^ mousePath; System::Windows::Forms::GroupBox^ groupBox1; int fontSize; public: Form1() { fontSize = 20; mousePath = gcnew System::Drawing::Drawing2D::GraphicsPath; this->panel1 = gcnew System::Windows::Forms::Panel; this->label1 = gcnew System::Windows::Forms::Label; this->clearButton = gcnew System::Windows::Forms::Button; this->label2 = gcnew System::Windows::Forms::Label; this->label3 = gcnew System::Windows::Forms::Label; this->label4 = gcnew System::Windows::Forms::Label; this->label5 = gcnew System::Windows::Forms::Label; this->label6 = gcnew System::Windows::Forms::Label; this->label7 = gcnew System::Windows::Forms::Label; this->label8 = gcnew System::Windows::Forms::Label; this->label9 = gcnew System::Windows::Forms::Label; this->groupBox1 = gcnew System::Windows::Forms::GroupBox; // Mouse Events Label this->label1->Location = System::Drawing::Point( 24, 504 ); this->label1->Size = System::Drawing::Size( 392, 23 ); // DoubleClickSize Label this->label2->AutoSize = true; this->label2->Location = System::Drawing::Point( 24, 48 ); this->label2->Size = System::Drawing::Size( 35, 13 ); // DoubleClickTime Label this->label3->AutoSize = true; this->label3->Location = System::Drawing::Point( 24, 72 ); this->label3->Size = System::Drawing::Size( 35, 13 ); // MousePresent Label this->label4->AutoSize = true; this->label4->Location = System::Drawing::Point( 24, 96 ); this->label4->Size = System::Drawing::Size( 35, 13 ); // MouseButtons Label this->label5->AutoSize = true; this->label5->Location = System::Drawing::Point( 24, 120 ); this->label5->Size = System::Drawing::Size( 35, 13 ); // MouseButtonsSwapped Label this->label6->AutoSize = true; this->label6->Location = System::Drawing::Point( 320, 48 ); this->label6->Size = System::Drawing::Size( 35, 13 ); // MouseWheelPresent Label this->label7->AutoSize = true; this->label7->Location = System::Drawing::Point( 320, 72 ); this->label7->Size = System::Drawing::Size( 35, 13 ); // MouseWheelScrollLines Label this->label8->AutoSize = true; this->label8->Location = System::Drawing::Point( 320, 96 ); this->label8->Size = System::Drawing::Size( 35, 13 ); // NativeMouseWheelSupport Label this->label9->AutoSize = true; this->label9->Location = System::Drawing::Point( 320, 120 ); this->label9->Size = System::Drawing::Size( 35, 13 ); // Mouse Panel this->panel1->Anchor = static_cast<System::Windows::Forms::AnchorStyles>(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 = System::Drawing::Point( 16, 160 ); this->panel1->Size = System::Drawing::Size( 664, 320 ); this->panel1->MouseUp += gcnew System::Windows::Forms::MouseEventHandler( this, &Form1::panel1_MouseUp ); this->panel1->Paint += gcnew System::Windows::Forms::PaintEventHandler( this, &Form1::panel1_Paint ); this->panel1->MouseEnter += gcnew System::EventHandler( this, &Form1::panel1_MouseEnter ); this->panel1->MouseHover += gcnew System::EventHandler( this, &Form1::panel1_MouseHover ); this->panel1->MouseMove += gcnew System::Windows::Forms::MouseEventHandler( this, &Form1::panel1_MouseMove ); this->panel1->MouseLeave += gcnew System::EventHandler( this, &Form1::panel1_MouseLeave ); this->panel1->MouseDown += gcnew System::Windows::Forms::MouseEventHandler( this, &Form1::panel1_MouseDown ); this->panel1->MouseWheel += gcnew System::Windows::Forms::MouseEventHandler( this, &Form1::panel1_MouseWheel ); // Clear Button this->clearButton->Anchor = static_cast<System::Windows::Forms::AnchorStyles>(System::Windows::Forms::AnchorStyles::Top | System::Windows::Forms::AnchorStyles::Right); this->clearButton->Location = System::Drawing::Point( 592, 504 ); this->clearButton->TabIndex = 1; this->clearButton->Text = "Clear"; this->clearButton->Click += gcnew System::EventHandler( this, &Form1::clearButton_Click ); // GroupBox this->groupBox1->Anchor = static_cast<System::Windows::Forms::AnchorStyles>(System::Windows::Forms::AnchorStyles::Top | System::Windows::Forms::AnchorStyles::Left | System::Windows::Forms::AnchorStyles::Right); this->groupBox1->Location = System::Drawing::Point( 16, 24 ); this->groupBox1->Size = 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 = System::Drawing::Size( 696, 534 ); array<System::Windows::Forms::Control^>^temp0 = {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->Controls->AddRange( temp0 ); this->Text = "Mouse Event Example"; // Displays information about the system mouse. label2->Text = "SystemInformation::DoubleClickSize: {0}",SystemInformation::DoubleClickSize; label3->Text = "SystemInformation::DoubleClickTime: {0}",SystemInformation::DoubleClickTime; label4->Text = "SystemInformation::MousePresent: {0}",SystemInformation::MousePresent; label5->Text = "SystemInformation::MouseButtons: {0}",SystemInformation::MouseButtons; label6->Text = "SystemInformation::MouseButtonsSwapped: {0}",SystemInformation::MouseButtonsSwapped; label7->Text = "SystemInformation::MouseWheelPresent: {0}",SystemInformation::MouseWheelPresent; label8->Text = "SystemInformation::MouseWheelScrollLines: {0}",SystemInformation::MouseWheelScrollLines; label9->Text = "SystemInformation::NativeMouseWheelSupport: {0}",SystemInformation::NativeMouseWheelSupport; } private: void panel1_MouseDown( Object^ /*sender*/, System::Windows::Forms::MouseEventArgs^ e ) { // Update the mouse path with the mouse information Point mouseDownLocation = Point(e->X,e->Y); String^ eventString = nullptr; 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 != nullptr ) { mousePath->AddString( eventString, FontFamily::GenericSerif, (int)FontStyle::Bold, (float)fontSize, mouseDownLocation, StringFormat::GenericDefault ); } else { mousePath->AddLine( mouseDownLocation, mouseDownLocation ); } panel1->Focus(); panel1->Invalidate(); } void panel1_MouseEnter( Object^ sender, System::EventArgs^ /*e*/ ) { // Update the mouse event label to indicate the MouseEnter event occurred. label1->Text = String::Concat( sender->GetType(), ": MouseEnter" ); } void panel1_MouseHover( Object^ sender, System::EventArgs^ /*e*/ ) { // Update the mouse event label to indicate the MouseHover event occurred. label1->Text = String::Concat( sender->GetType(), ": MouseHover" ); } void panel1_MouseLeave( Object^ sender, System::EventArgs^ /*e*/ ) { // Update the mouse event label to indicate the MouseLeave event occurred. label1->Text = String::Concat( sender->GetType(), ": MouseLeave" ); } 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 ); } 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 = gcnew System::Drawing::Drawing2D::Matrix; translateMatrix->Translate( 0, (float)numberOfPixelsToMove ); mousePath->Transform(translateMatrix); } panel1->Invalidate(); } void panel1_MouseUp( Object^ /*sender*/, System::Windows::Forms::MouseEventArgs^ e ) { Point mouseUpLocation = System::Drawing::Point( e->X, e->Y ); // Show the number of clicks in the path graphic. int numberOfClicks = e->Clicks; mousePath->AddString( String::Format( " {0}", numberOfClicks ), FontFamily::GenericSerif, (int)FontStyle::Bold, (float)fontSize, mouseUpLocation, StringFormat::GenericDefault ); panel1->Invalidate(); } void panel1_Paint( Object^ /*sender*/, System::Windows::Forms::PaintEventArgs^ e ) { // Perform the painting of the Panel. e->Graphics->DrawPath( System::Drawing::Pens::DarkRed, mousePath ); } void clearButton_Click( Object^ /*sender*/, System::EventArgs^ /*e*/ ) { // Clear the Panel display. delete mousePath; mousePath = gcnew System::Drawing::Drawing2D::GraphicsPath; panel1->Invalidate(); } };}[STAThread]int main(){ Application::Run( gcnew MouseEvent::Form1 );}

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(); } }}

Imports System.DrawingImports System.Windows.FormsNamespace MouseEvent ' Summary description for Form1. Public NotInheritable Class Form1 Inherits System.Windows.Forms.Form Friend WithEvents panel1 As System.Windows.Forms.Panel Private label1 As System.Windows.Forms.Label Private label2 As System.Windows.Forms.Label Private label3 As System.Windows.Forms.Label Private label4 As System.Windows.Forms.Label Private label5 As System.Windows.Forms.Label Private label6 As System.Windows.Forms.Label Private label7 As System.Windows.Forms.Label Private label8 As System.Windows.Forms.Label Private label9 As System.Windows.Forms.Label Friend WithEvents clearButton As System.Windows.Forms.Button Private mousePath As System.Drawing.Drawing2D.GraphicsPath Private groupBox1 As System.Windows.Forms.GroupBox Private fontSize As Integer = 20 <System.STAThread()> _ Public Shared Sub Main() System.Windows.Forms.Application.Run(New Form1()) End Sub Public Sub New() mousePath = New System.Drawing.Drawing2D.GraphicsPath() Me.panel1 = New System.Windows.Forms.Panel() Me.label1 = New System.Windows.Forms.Label() Me.clearButton = New System.Windows.Forms.Button() Me.label2 = New System.Windows.Forms.Label() Me.label3 = New System.Windows.Forms.Label() Me.label4 = New System.Windows.Forms.Label() Me.label5 = New System.Windows.Forms.Label() Me.label6 = New System.Windows.Forms.Label() Me.label7 = New System.Windows.Forms.Label() Me.label8 = New System.Windows.Forms.Label() Me.label9 = New System.Windows.Forms.Label() Me.groupBox1 = New System.Windows.Forms.GroupBox() ' Mouse Events Label Me.label1.Location = New System.Drawing.Point(24, 504) Me.label1.Size = New System.Drawing.Size(392, 23) ' DoubleClickSize Label Me.label2.AutoSize = True Me.label2.Location = New System.Drawing.Point(24, 48) Me.label2.Size = New System.Drawing.Size(35, 13) ' DoubleClickTime Label Me.label3.AutoSize = True Me.label3.Location = New System.Drawing.Point(24, 72) Me.label3.Size = New System.Drawing.Size(35, 13) ' MousePresent Label Me.label4.AutoSize = True Me.label4.Location = New System.Drawing.Point(24, 96) Me.label4.Size = New System.Drawing.Size(35, 13) ' MouseButtons Label Me.label5.AutoSize = True Me.label5.Location = New System.Drawing.Point(24, 120) Me.label5.Size = New System.Drawing.Size(35, 13) ' MouseButtonsSwapped Label Me.label6.AutoSize = True Me.label6.Location = New System.Drawing.Point(320, 48) Me.label6.Size = New System.Drawing.Size(35, 13) ' MouseWheelPresent Label Me.label7.AutoSize = True Me.label7.Location = New System.Drawing.Point(320, 72) Me.label7.Size = New System.Drawing.Size(35, 13) ' MouseWheelScrollLines Label Me.label8.AutoSize = True Me.label8.Location = New System.Drawing.Point(320, 96) Me.label8.Size = New System.Drawing.Size(35, 13) ' NativeMouseWheelSupport Label Me.label9.AutoSize = True Me.label9.Location = New System.Drawing.Point(320, 120) Me.label9.Size = New System.Drawing.Size(35, 13) ' Mouse Panel Me.panel1.Anchor = System.Windows.Forms.AnchorStyles.Top Or _ System.Windows.Forms.AnchorStyles.Left Or _ System.Windows.Forms.AnchorStyles.Right Me.panel1.BackColor = System.Drawing.SystemColors.ControlDark Me.panel1.Location = New System.Drawing.Point(16, 160) Me.panel1.Size = New System.Drawing.Size(664, 320) ' Clear Button Me.clearButton.Anchor = System.Windows.Forms.AnchorStyles.Top Or _ System.Windows.Forms.AnchorStyles.Right Me.clearButton.Location = New System.Drawing.Point(592, 504) Me.clearButton.TabIndex = 1 Me.clearButton.Text = "Clear" ' GroupBox Me.groupBox1.Anchor = System.Windows.Forms.AnchorStyles.Top Or _ System.Windows.Forms.AnchorStyles.Left Or _ System.Windows.Forms.AnchorStyles.Right Me.groupBox1.Location = New System.Drawing.Point(16, 24) Me.groupBox1.Size = New System.Drawing.Size(664, 128) Me.groupBox1.Text = "System.Windows.Forms.SystemInformation" ' Set up how the form should be displayed and add the controls to the form. Me.ClientSize = New System.Drawing.Size(696, 534) Me.Controls.AddRange(New System.Windows.Forms.Control() {Me.label9, _ Me.label8, Me.label7, Me.label6, Me.label5, Me.label4, _ Me.label3, Me.label2, Me.clearButton, Me.panel1, Me.label1, Me.groupBox1}) Me.Text = "Mouse Event Example" ' Display 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() End Sub Private Sub panel1_MouseDown(sender As Object, e As System.Windows.Forms.MouseEventArgs) Handles panel1.MouseDown ' Update the mouse path with the mouse information Dim mouseDownLocation As New Point(e.X, e.Y) Dim eventString As String = Nothing Select Case e.Button Case MouseButtons.Left eventString = "L" Case MouseButtons.Right eventString = "R" Case MouseButtons.Middle eventString = "M" Case MouseButtons.XButton1 eventString = "X1" Case MouseButtons.XButton2 eventString = "X2" Case MouseButtons.None: eventString = Nothing End Select If (eventString IsNot Nothing) Then mousePath.AddString(eventString, FontFamily.GenericSerif, CInt(FontStyle.Bold), fontSize, mouseDownLocation, StringFormat.GenericDefault) Else mousePath.AddLine(mouseDownLocation, mouseDownLocation) End If panel1.Focus() panel1.Invalidate() End Sub Private Sub panel1_MouseEnter(sender As Object, e As System.EventArgs) Handles panel1.MouseEnter ' Update the mouse event label to indicate the MouseEnter event occurred. label1.Text = sender.GetType().ToString() + ": MouseEnter" End Sub Private Sub panel1_MouseHover(sender As Object, e As System.EventArgs) Handles panel1.MouseHover ' Update the mouse event label to indicate the MouseHover event occurred. label1.Text = sender.GetType().ToString() + ": MouseHover" End Sub Private Sub panel1_MouseLeave(sender As Object, e As System.EventArgs) Handles panel1.MouseLeave ' Update the mouse event label to indicate the MouseLeave event occurred. label1.Text = sender.GetType().ToString() + ": MouseLeave" End Sub Private Sub panel1_MouseMove(sender As Object, e As System.Windows.Forms.MouseEventArgs) Handles panel1.MouseMove ' Update the mouse path that is drawn onto the Panel. Dim mouseX As Integer = e.X Dim mouseY As Integer = e.Y mousePath.AddLine(mouseX, mouseY, mouseX, mouseY) End Sub Private Sub panel1_MouseWheel(sender As Object, e As System.Windows.Forms.MouseEventArgs) Handles panel1.MouseWheel ' Update the drawing based upon the mouse wheel scrolling. Dim numberOfTextLinesToMove As Integer = CInt(e.Delta * SystemInformation.MouseWheelScrollLines / 120) Dim numberOfPixelsToMove As Integer = numberOfTextLinesToMove * fontSize If numberOfPixelsToMove <> 0 Then Dim translateMatrix As New System.Drawing.Drawing2D.Matrix() translateMatrix.Translate(0, numberOfPixelsToMove) mousePath.Transform(translateMatrix) End If panel1.Invalidate() End Sub Private Sub panel1_MouseUp(sender As Object, e As System.Windows.Forms.MouseEventArgs) Handles panel1.MouseUp Dim mouseUpLocation As New System.Drawing.Point(e.X, e.Y) ' Show the number of clicks in the path graphic. Dim numberOfClicks As Integer = e.Clicks mousePath.AddString(" " + numberOfClicks.ToString(), _ FontFamily.GenericSerif, CInt(FontStyle.Bold), _ fontSize, mouseUpLocation, StringFormat.GenericDefault) panel1.Invalidate() End Sub Private Sub panel1_Paint(sender As Object, e As System.Windows.Forms.PaintEventArgs) Handles panel1.Paint ' Perform the painting of the Panel. e.Graphics.DrawPath(System.Drawing.Pens.DarkRed, mousePath) End Sub Private Sub clearButton_Click(sender As Object, e As System.EventArgs) Handles clearButton.Click ' Clear the Panel display. mousePath.Dispose() mousePath = New System.Drawing.Drawing2D.GraphicsPath() panel1.Invalidate() End Sub End ClassEnd Namespace

Hinweise

Mausereignisse treten in der folgenden Reihenfolge auf:

1. MouseEnter

2. MouseMove

   (Video) Mouse move event in c#

3. MouseHover / MouseDown / MouseWheel

4. MouseUp

5. MouseLeave

   (Video) 049 - M - C# Button MouseEnter Event Handler

Weitere Informationen zur Behandlung von Ereignissen finden Sie unter behandeln und Auslösen von Ereignissen.

Gilt für

Weitere Informationen

• OnMouseEnter(EventArgs)
• MouseLeave
• MouseHover
• MouseEventArgs