不理解控件中的OnPaint [英] Not understanding OnPaint in a control

问题描述

大家好，


我试图在自定义文本框中覆盖OnPaint

控件（所以我可以抽取字幕等等）。在下面的

代码中，我得到了绘制表单。消息为

预期，但不是绘制控件。它也没有影响显式调用txtTest.Invalidate或

txtTest.Refresh。我在这里错过了一些简单的东西吗？

任何正确方向的推动都会受到赞赏。


BB


公开Class Form1

继承System.Windows.Forms.Form


#Region" Windows窗体设计器生成的代码

#End Region


Private Sub Form1_Load（ByVal sender As System.Object，

ByVal e As System.EventArgs）处理MyBase.Load

Dim txtTest作为新的MyTextBox

Controls.Add（txtTest）

End Sub


受保护覆盖​​Sub onpaint（ByVal e As

PaintEventArgs）

MessageBox.Show（"绘制表单...）

结束子


结束班


公共类MyTextBox

继承TextBox


受保护覆盖​​Sub onpaint（ByVal e As

PaintEventArgs）

MessageBox.Show（"绘制文本框......） ;）

结束子


结束班

解决方案

*BB <一个******* @ discussions.microsoft.com> scripsit：

我试图在自定义文本框
控件中覆盖OnPaint（所以我可以抽取字幕等等）。在下面的
代码中，我得到了绘制表单。消息为
预期，但不是绘制控件。它还

在''Form1'的处理程序中调用''MyBase.OnPaint（e）''。


-

Herfried K. Wagner [MVP]

< http://www.mvps.org/dotnet>

发布您的代码。 。 。


BB写道：

大家好，

我试图在自定义文本框中覆盖OnPaint <控制（所以我可以抽取标题等）。在下面的
代码中，我得到了绘制表单。消息为
预期，但不是绘制控件。它也没有效果显式调用txtTest.Invalidate或
txtTest.Refresh。我在这里错过了一些简单的东西吗？
任何正确方向的推动都会受到赞赏。

BB

公共类Form1
继承System.Windows.Forms .Form

#Region" Windows窗体设计器生成的代码
#End Region
私有Sub Form1_Load（ByVal sender As System.Object，
ByVal e As System.EventArgs）处理MyBase.Load
Dim txtTest作为新的MyTextBox
Controls.Add（txtTest）
End Sub

受保护的覆盖Sub onpaint（ByVal e As
PaintEventArgs）
MessageBox .Show（绘制形式......）
结束子

结束类

公共类MyTextBox
继承TextBox
受保护的覆盖Sub onpaint（ByVal e As
PaintEventArgs）
MessageBox.Show（"绘制文本框......）
End Sub

问候 - OHM＃开* *********@BTInternet.com

这是因为文本框没有调用OnPaint事件。 />

" BB" <一个******* @ discussions.microsoft.com>在消息中写道

news：0b **************************** @ phx.gbl ... < blockquote class =post_quotes>大家好，

我试图在自定义文本框中控制OnPaint
控件（所以我可以抽取字幕等等）。在下面的
代码中，我得到了绘制表单。消息为
预期，但不是绘制控件。它也没有效果显式调用txtTest.Invalidate或
txtTest.Refresh。我在这里错过了一些简单的东西吗？
任何正确方向的推动都会受到赞赏。

BB

公共类Form1
继承System.Windows.Forms .Form

#Region" Windows窗体设计器生成的代码
#End Region
私有Sub Form1_Load（ByVal sender As System.Object，
ByVal e As System.EventArgs）处理MyBase.Load
Dim txtTest作为新的MyTextBox
Controls.Add（txtTest）
End Sub

受保护的覆盖Sub onpaint（ByVal e As
PaintEventArgs）
MessageBox .Show（绘制形式......）
结束子

结束类

公共类MyTextBox
继承TextBox
受保护的覆盖Sub onpaint（ByVal e As
PaintEventArgs）
MessageBox.Show（"绘制文本框......）
End Sub

结束类

Hello all,

I am trying to override OnPaint in a custom textbox
control (so I can drawstring a caption, etc.). In the
code below, I get the "painting the form" message as
expected, but not the "painting the control". It also
has no effect to explicitly call txtTest.Invalidate or
txtTest.Refresh. Am I missing something simple here?
Any push in the right direction is appreciated.

BB

Public Class Form1
Inherits System.Windows.Forms.Form

#Region " Windows Form Designer generated code "
#End Region

Private Sub Form1_Load(ByVal sender As System.Object,
ByVal e As System.EventArgs) Handles MyBase.Load
Dim txtTest As New MyTextBox
Controls.Add(txtTest)
End Sub

Protected Overrides Sub onpaint(ByVal e As
PaintEventArgs)
MessageBox.Show("Painting the form...")
End Sub

End Class

Public Class MyTextBox
Inherits TextBox

Protected Overrides Sub onpaint(ByVal e As
PaintEventArgs)
MessageBox.Show("Painting the textbox...")
End Sub

End Class

解决方案

* "BB" <an*******@discussions.microsoft.com> scripsit:

I am trying to override OnPaint in a custom textbox
control (so I can drawstring a caption, etc.). In the
code below, I get the "painting the form" message as
expected, but not the "painting the control". It also

Call ''MyBase.OnPaint(e)'' in the handler on ''Form1''.

--
Herfried K. Wagner [MVP]
<http://www.mvps.org/dotnet>

Post your code . . .


BB wrote:

Hello all,

I am trying to override OnPaint in a custom textbox
control (so I can drawstring a caption, etc.). In the
code below, I get the "painting the form" message as
expected, but not the "painting the control". It also
has no effect to explicitly call txtTest.Invalidate or
txtTest.Refresh. Am I missing something simple here?
Any push in the right direction is appreciated.

BB

Public Class Form1
Inherits System.Windows.Forms.Form

#Region " Windows Form Designer generated code "
#End Region

Private Sub Form1_Load(ByVal sender As System.Object,
ByVal e As System.EventArgs) Handles MyBase.Load
Dim txtTest As New MyTextBox
Controls.Add(txtTest)
End Sub

Protected Overrides Sub onpaint(ByVal e As
PaintEventArgs)
MessageBox.Show("Painting the form...")
End Sub

End Class

Public Class MyTextBox
Inherits TextBox

Protected Overrides Sub onpaint(ByVal e As
PaintEventArgs)
MessageBox.Show("Painting the textbox...")
End Sub

End Class

Regards - OHM# On**********@BTInternet.com

It''s because the Textbox doesn''t call the OnPaint Event.

"BB" <an*******@discussions.microsoft.com> wrote in message
news:0b****************************@phx.gbl...

Hello all,

I am trying to override OnPaint in a custom textbox
control (so I can drawstring a caption, etc.). In the
code below, I get the "painting the form" message as
expected, but not the "painting the control". It also
has no effect to explicitly call txtTest.Invalidate or
txtTest.Refresh. Am I missing something simple here?
Any push in the right direction is appreciated.

BB

Public Class Form1
Inherits System.Windows.Forms.Form

#Region " Windows Form Designer generated code "
#End Region

Private Sub Form1_Load(ByVal sender As System.Object,
ByVal e As System.EventArgs) Handles MyBase.Load
Dim txtTest As New MyTextBox
Controls.Add(txtTest)
End Sub

Protected Overrides Sub onpaint(ByVal e As
PaintEventArgs)
MessageBox.Show("Painting the form...")
End Sub

End Class

Public Class MyTextBox
Inherits TextBox

Protected Overrides Sub onpaint(ByVal e As
PaintEventArgs)
MessageBox.Show("Painting the textbox...")
End Sub

End Class

这篇关于不理解控件中的OnPaint的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！