PaintEventArgs 类

PaintEventArgs 类

.NET Framework 4.5

其他版本

为Paint事件提供数据。

继承层次结构

System.Object

System.EventArgs

System.Windows.Forms.PaintEventArgs

System.Windows.Forms.TableLayoutCellPaintEventArgs

命名空间：System.Windows.Forms

程序集： System.Windows.Forms（在 System.Windows.Forms.dll 中）语法

C#

C++

F#

VB

声明

Public Class PaintEventArgs _

Inherits EventArgs _

Implements IDisposable

PaintEventArgs 类型公开以下成员。

构造函数

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属性

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方法

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备注

重新绘制控件时发生Paint事件。 PaintEventArgs 指定绘制控件所用的Graphics以及绘制控件所在的ClipRectangle。

有关事件模型的信息，请参见事件和委托。

示例

下面的示例说明了如何处理Paint事件以及如何使用 PaintEventArgs 类在窗体中绘制矩形。MouseDown和MouseUp事件将被处理以确定矩形的大小。此示例还说明了使矩形区域无效从而对其进行重新绘制的Invalidate方法。

VB

Dim RcDraw As Rectangle

Dim PenWidth As Integer = 5

Private Sub Form1_MouseDown(ByVal sender As Object, ByVal e As System.Windows.Forms.MouseEventArgs) Handles MyBase.MouseDown

' Determine the initial rectangle coordinates...

RcDraw.X = e.X

RcDraw.Y = e.Y

End Sub

Private Sub Form1_MouseUp(ByVal sender As Object, ByVal e As System.Windows.Forms.MouseEventArgs) Handles MyBase.MouseUp

' Determine the width and height of the rectangle...

If e.X < RcDraw.X Then

RcDraw.Width = RcDraw.X - e.X

RcDraw.X = e.X

Else

RcDraw.Width = e.X - RcDraw.X

End If

If e.Y < RcDraw.Y Then

RcDraw.Height = RcDraw.Y - e.Y

RcDraw.Y = e.Y

Else

RcDraw.Height = e.Y - RcDraw.Y

End If

' Force a repaint of the region occupied by the rectangle...

Me.Invalidate(RcDraw)

End Sub

Private Sub Form1_Paint(ByVal sender As Object, ByVal e As System.Windows.Forms.PaintEventArgs) Handles MyBase.Paint

' Draw the rectangle...

e.Graphics.DrawRectangle(New Pen(Color.Blue, PenWidth), RcDraw)

End Sub