Baseline snaplines in custom Winforms controls

Question

I have a custom user control with a textbox on it and I\'d like to expose the baseline (of the text in the textbox) snapline outside of the custom control. I know that you

Answer 1

You're on the right track. You will need to override the SnapLines property in your designr and do something like this:

Public Overrides ReadOnly Property SnapLines() As System.Collections.IList
    Get
        Dim snapLinesList As ArrayList = TryCast(MyBase.SnapLines, ArrayList)

        Dim offset As Integer
        Dim ctrl As MyControl = TryCast(Me.Control, MyControl)
        If ctrl IsNot Nothing AndAlso ctrl.TextBox1 IsNot Nothing Then
            offset = ctrl.TextBox1.Bottom - 5
        End If

        snapLinesList.Add(New SnapLine(SnapLineType.Baseline, offset, SnapLinePriority.Medium))

        Return snapLinesList

    End Get
End Property

In this example the usercontrol contains a textbox. The code adds a new snapline that represents the baseline for the textbox. The important thing is to calculate the offset correctly.