无论何时我将
RichTextBox.Enabled
属性设置为 false,它的背景颜色都会自动设置为灰色,因为它被设置为在控制面板中设置的系统颜色。即使我将其设置为禁用状态,我该如何将其颜色更改为黑色?RichTextBox.Enabled
属性设置为 false,它的背景颜色都会自动设置为灰色,因为它被设置为在控制面板中设置的系统颜色。即使我将其设置为禁用状态,我该如何将其颜色更改为黑色?[编辑 - 添加了代码示例]
richTextBox.TabStop = false;
richTextBox.ReadOnly = true;
richTextBox.BackColor = Color.DimGray;
richTextBox.Cursor = Cursors.Arrow;
richTextBox.Enter += richTextBox_Enter;
private void richTextBox_Enter(object sender, EventArgs e)
{
// you need to set the focus somewhere else. Eg a label.
SomeOtherControl.Focus();
}
或者作为扩展方法(我意识到您不必将其放在只读中,因为Enter事件会捕获任何输入):
public static class MyExtensions
{
public static void Disable( this Control control, Control focusTarget )
{
control.TabStop = false;
control.BackColor = Color.DimGray;
control.Cursor = Cursors.Arrow;
control.Enter += delegate { focusTarget.Focus(); };
}
}
我刚刚找到了一种很好的方法来做这件事。它应该可以与任何控件一起使用:
public class DisabledRichTextBox : System.Windows.Forms.RichTextBox
{
// See: http://wiki.winehq.org/List_Of_Windows_Messages
private const int WM_SETFOCUS = 0x07;
private const int WM_ENABLE = 0x0A;
private const int WM_SETCURSOR = 0x20;
protected override void WndProc(ref System.Windows.Forms.Message m)
{
if (!(m.Msg == WM_SETFOCUS || m.Msg == WM_ENABLE || m.Msg == WM_SETCURSOR))
base.WndProc(ref m);
}
}
richTextBox.BackColor = Color.White;
richTextBox.ReadOnly = true;
Public Class MyRichTextBox
Inherits RichTextBox
<DllImport("kernel32.dll", CharSet:=CharSet.Auto)> _
Shared Function LoadLibrary(ByVal lpFileName As String) As IntPtr
End Function
Protected Overloads Overrides ReadOnly Property CreateParams() As CreateParams
Get
Dim prams As CreateParams = MyBase.CreateParams
If LoadLibrary("msftedit.dll") <> IntPtr.Zero Then
prams.ExStyle = prams.ExStyle Or &H20 'Makes Transparent
prams.ClassName = "RICHEDIT50W"
End If
Return prams
End Get
End Property
虽然已经晚了,但并不是一件坏事,
private void richTextBox1_ReadOnlyChanged(object sender, EventArgs e)
{
//just here instead of White select your color
richTextBox1.BackColor = Color.White;
}
private void Form1_Load(object sender, EventArgs e)
{
richTextBox1.ReadOnly = true;
}
看一下 DrawStringDisabled 方法。你需要重写 OnPaint 方法,然后使用 DrawStringDisabled 方法。但是,如果我在你的位置上,我会选择 Mikael Svenson 的答案。