MouseEventArgs 类

定义

public ref class MouseEventArgs : EventArgs

[System.Runtime.InteropServices.ComVisible(true)]
public class MouseEventArgs : EventArgs

public class MouseEventArgs : EventArgs

[<System.Runtime.InteropServices.ComVisible(true)>]
type MouseEventArgs = class
    inherit EventArgs

type MouseEventArgs = class
    inherit EventArgs

Public Class MouseEventArgs
Inherits EventArgs

继承

Object

EventArgs

MouseEventArgs

派生

System.Windows.Forms.DataGridViewCellMouseEventArgs

System.Windows.Forms.HandledMouseEventArgs

System.Windows.Forms.StatusBarPanelClickEventArgs

System.Windows.Forms.TreeNodeMouseClickEventArgs

属性

ComVisibleAttribute

示例

下面的代码示例处理 MouseDown 控件上的 TextBox 事件，以便单击鼠标右键选择控件中的所有文本。 此示例要求具有包含名为 的textBox1控件的窗体TextBox。

private void Form1_Load(object sender, EventArgs e)
{
    // This line suppresses the default context menu for the TextBox control. 
    textBox1.ContextMenu = new ContextMenu();
    textBox1.MouseDown += new MouseEventHandler(textBox1_MouseDown);
}

void textBox1_MouseDown(object sender, System.Windows.Forms.MouseEventArgs e)
{
    if (e.Button == MouseButtons.Right)
    {
        textBox1.Select(0, textBox1.Text.Length);
    }
}

Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
    TextBox1.ContextMenuStrip = New ContextMenuStrip()
End Sub

Private Sub TextBox1_MouseDown(ByVal sender As Object, ByVal e As System.Windows.Forms.MouseEventArgs) Handles TextBox1.MouseDown
    If (e.Button = MouseButtons.Right) Then
        TextBox1.Select(0, TextBox1.Text.Length)
    End If
End Sub

下面的代码示例使用 Location 属性跟踪鼠标左键的单击次数，并绘制一系列直线段以响应用户输入。 如果隐藏窗体，然后重新显示窗体，则本示例不会重新绘制线条;为简单起见，省略了此代码。

Point firstPoint;
Boolean haveFirstPoint;

public void EnableDrawing()
{
    this.MouseDown += new MouseEventHandler(Form1_MouseDownDrawing);
}

void Form1_MouseDownDrawing(object sender, System.Windows.Forms.MouseEventArgs e)
{
    if (haveFirstPoint)
    {
        Graphics g = this.CreateGraphics();
        g.DrawLine(Pens.Black, firstPoint, e.Location);
        haveFirstPoint = false;
    }
    else
    {
        firstPoint = e.Location;
        haveFirstPoint = true;
    }
}

Dim FirstPoint As Point
Dim HaveFirstPoint As Boolean = False

Private Sub Form1_MouseDownDrawing(ByVal sender As Object, ByVal e As System.Windows.Forms.MouseEventArgs) Handles Me.MouseDown
    If HaveFirstPoint Then
        Dim g As Graphics = Me.CreateGraphics()
        g.DrawLine(Pens.Black, FirstPoint, e.Location)
        HaveFirstPoint = False
    Else
        FirstPoint = e.Location
        HaveFirstPoint = True
    End If
End Sub

下面的代码示例使用 X 和 Y 属性显示鼠标指针在 ToolTip 窗口中的当前位置。

ToolTip trackTip;

private void TrackCoordinates()
{
    trackTip = new ToolTip();
    this.MouseMove += new MouseEventHandler(Form1_MouseMove);
}

void Form1_MouseMove(object sender, System.Windows.Forms.MouseEventArgs e)
{
    String tipText = String.Format("({0}, {1})", e.X, e.Y);
    trackTip.Show(tipText, this, e.Location);
}

Dim TrackTip As ToolTip

Private Sub TrackCoordinates()
    TrackTip = New ToolTip()
End Sub

Private Sub Form1_MouseMove(ByVal sender As Object, ByVal e As System.Windows.Forms.MouseEventArgs) Handles Me.MouseMove
    Dim TipText As String = String.Format("({0}, {1})", e.X, e.Y)
    TrackTip.Show(TipText, Me, e.Location)
End Sub

注解

当用户 MouseDown 在指针位于控件上时按下鼠标按钮时，将发生该事件。 当用户 MouseUp 松开鼠标按钮，而指针停留在控件上时，将发生该事件。 MouseMove当用户将鼠标指针移到控件上时发生 该事件。 指定 MouseEventArgs 按下的鼠标按钮、按下和释放鼠标按钮的次数、鼠标坐标以及鼠标滚轮的移动量。

如果用户在松开鼠标按钮之前将焦点切换到另一个 MouseDown 应用程序，则可能会收到没有相应 MouseUp的事件。

、 和 NotifyIcon 类存在ControlAxHost这三个事件。

有关事件模型的信息，请参阅 处理和引发事件。

另请参阅

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