vb .NET custom control inheriting from TextBox doesn't fire Paint event

Question

I need a multiline TextBox which is always disabled, but it shouldn\'t paint itself in gray, but I want to keep its designer choosen color.

I previously had the same re

Answer 1

here is your answer:

Protected Overrides Sub OnPaint(ByVal e As System.Windows.Forms.PaintEventArgs)
    MyBase.OnPaint(e)
    e.Graphics.FillRectangle(Brushes.LightGray, Me.DisplayRectangle)
    Dim sf As New StringFormat
    sf.FormatFlags = StringFormatFlags.NoWrap
    sf.HotkeyPrefix = Drawing.Text.HotkeyPrefix.Show 'if Mnemonic property is set to true
    sf.HotkeyPrefix = Drawing.Text.HotkeyPrefix.Hide 'or none if Mnemonic property is set to false
    sf.LineAlignment = StringAlignment.Center 'horizontal alignment
    sf.Alignment = StringAlignment.Center ' vertical ...
    Dim rect As Rectangle = Me.DisplayRectangle ' this is your text bounds for setting your text alignement using StringFormat(sf)
    e.Graphics.DrawString("Something", Me.Font, Brushes.DarkOliveGreen, rect, sf)
End Sub

Answer 2

I've found a solution. It looks like a TextBox disables the Paint event even for subclasses. But you can force the WM_PAINT bit calling SetStyle:

Public Class DisabledTextBox
    Inherits TextBox

    Public Sub New()
        InitializeComponent()

        Enabled = False
        SetStyle(ControlStyles.Selectable, False)
        SetStyle(ControlStyles.UserPaint, True)

    End Sub

    Protected Overrides Sub OnPaint(ByVal e As System.Windows.Forms.PaintEventArgs)
        Dim brush As New SolidBrush(Me.ForeColor)
        e.Graphics.DrawString(Me.Text, Me.Font, brush, 0, 0)
    End Sub

End Class

It works perfectly as expected :)