[英]Disable fontsize change for RichTextBox
In my application I am using RichTextBox
es with readonly property set to True.在我的应用程序中,我使用的是
RichTextBox
es,其 readonly 属性设置为 True。
But the font size can still be changed using the mouse wheel and default windows keyboard shortcut for fontsize change ( Ctrl + shift + > / < ).但是字体大小仍然可以使用鼠标滚轮和默认的 windows 键盘快捷键更改字体大小( Ctrl + shift + > / < )。
How do I disable RichTextBox
font size change?如何禁用
RichTextBox
字体大小更改?
To disable the key combinations of Control+Shift+<
or Control+Shift+>
, you need to implement the following KeyDown event handler for your RichTextBox control:要禁用
Control+Shift+<
或Control+Shift+>
的组合键,您需要为RichTextBox控件实现以下KeyDown事件处理程序:
Private Sub RichTextBox1_KeyDown(ByVal sender As Object, ByVal e As System.Windows.Forms.KeyEventArgs) Handles RichTextBox1.KeyDown
' disable the key combination of
' "control + shift + <"
' or
' "control + shift + >"
e.SuppressKeyPress = e.Control AndAlso e.Shift And (e.KeyValue = Keys.Oemcomma OrElse e.KeyValue = Keys.OemPeriod)
End Sub
This code prevents the user from resizing the font in the given RichTextBox
with keyboard commands.此代码可防止用户使用键盘命令调整给定
RichTextBox
中的字体大小。
To disable changing the font size by using Ctrl plus the mousewheel, the only way I know how to do this is to make a user control
that inherits from RichTextBox
.要禁用使用Ctrl加鼠标滚轮更改字体大小,我知道如何做到这一点的唯一方法是创建一个继承自
RichTextBox
的用户control
。
Once you have done that the only thing you need to do is override the WndProc
procedure so that it effectively disables any messages when the scrollwheel is moving and the Ctrl button is pressed.完成此操作后,您唯一需要做的就是覆盖
WndProc
过程,以便在滚轮移动并按下Ctrl按钮时有效地禁用任何消息。 See the code below for implementing a UserControl
derived from the RichTextBox
:请参阅下面的代码以实现从
RichTextBox
派生的UserControl
:
Public Class DerivedRichTextBox
Inherits RichTextBox
Protected Overrides Sub WndProc(ByRef m As System.Windows.Forms.Message)
' windows message constant for scrollwheel moving
Const WM_SCROLLWHEEL As Integer = &H20A
Dim scrollingAndPressingControl As Boolean = m.Msg = WM_SCROLLWHEEL AndAlso Control.ModifierKeys = Keys.Control
'if scolling and pressing control then do nothing (don't let the base class know),
'otherwise send the info down to the base class as normal
If (Not scrollingAndPressingControl) Then
MyBase.WndProc(m)
End If
End Sub
End Class
Here's a class that offers disabling both scrollwheel and shortcuts zoom as actual options in the properties you get when editing the components in the designer view:这是一个 class,它提供了禁用滚轮和快捷方式缩放作为在设计器视图中编辑组件时获得的属性中的实际选项:
public class RichTextBoxZoomControl : RichTextBox
{
private Boolean m_AllowScrollWheelZoom = true;
private Boolean m_AllowKeyZoom = true;
[Description("Allow adjusting zoom with [Ctrl]+[Scrollwheel]"), Category("Behavior")]
[DefaultValue(true)]
public Boolean AllowScrollWheelZoom
{
get { return m_AllowScrollWheelZoom; }
set { m_AllowScrollWheelZoom = value; }
}
[Description("Allow adjusting zoom with [Ctrl]+[Shift]+[,] and [Ctrl]+[Shift]+[.]"), Category("Behavior")]
[DefaultValue(true)]
public Boolean AllowKeyZoom
{
get { return m_AllowKeyZoom; }
set { m_AllowKeyZoom = value; }
}
protected override void WndProc(ref Message m)
{
if (!m_AllowScrollWheelZoom && (m.Msg == 0x115 || m.Msg == 0x20a) && (Control.ModifierKeys & Keys.Control) != 0)
return;
base.WndProc(ref m);
}
protected override void OnKeyDown(KeyEventArgs e)
{
if (!this.m_AllowKeyZoom && e.Control && e.Shift && (e.KeyValue == (Int32)Keys.Oemcomma || e.KeyValue == (Int32)Keys.OemPeriod))
return;
base.OnKeyDown(e);
}
}
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