MouseEventHandler Делегат
Определение
Важно!
Некоторые сведения относятся к предварительной версии продукта, в которую до выпуска могут быть внесены существенные изменения. Майкрософт не предоставляет никаких гарантий, явных или подразумеваемых, относительно приведенных здесь сведений.
Представляет метод, который будет обрабатывать событие MouseDown, MouseUp или MouseMove формы, элемента управления или другого компонента.
public delegate void MouseEventHandler(System::Object ^ sender, MouseEventArgs ^ e);public delegate void MouseEventHandler(object sender, MouseEventArgs e);public delegate void MouseEventHandler(object? sender, MouseEventArgs e);type MouseEventHandler = delegate of obj * MouseEventArgs -> unitPublic Delegate Sub MouseEventHandler(sender As Object, e As MouseEventArgs)Параметры
- sender
- Object
Источник события.
Объект MouseEventArgs, содержащий данные события.
Примеры
В следующем примере кода демонстрируется использование различных событий мыши для рисования пути мыши на объекте Panel. Сегмент строки добавляется в GraphicsPath для каждого MouseMove события и MouseDown . Чтобы обновить графику Invalidate , вызывается метод для Panel события MouseDown и MouseUp . Кроме того, графический путь прокручивается вверх или вниз при возникновении MouseWheel события. Дополнительные события мыши, такие как MouseHover, также идентифицируются на экране. На экране также отображаются дополнительные сведения о мыши из SystemInformation класса .
#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.Drawing
Imports System.Windows.Forms
Namespace 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 Class
End Namespace
Комментарии
При создании делегата MouseEventHandler необходимо указать метод, обрабатывающий событие. Чтобы связать событие с обработчиком событий, нужно добавить в событие экземпляр делегата. Обработчик событий вызывается всякий раз, когда происходит событие, если делегат не удален. Дополнительные сведения об обработке событий с помощью делегатов см. в разделе Обработка и вызов событий.
Методы расширения
| GetMethodInfo(Delegate) |
Получает объект, представляющий метод, представленный указанным делегатом. |
Применяется к
См. также раздел
Совместная работа с нами на GitHub
Источник этого содержимого можно найти на GitHub, где также можно создавать и просматривать проблемы и запросы на вытягивание. Дополнительные сведения см. в нашем руководстве для участников.
