/// <summary>
/// This method switches the mode of the underlying RichTextBox
/// that is used for rendering according to the
/// <see cref="ShapeDrawAction"/> of this element.
/// When no fill ist set, the RichTextBox is transparent and
/// only in this case use the CreateParams.Transparent styled
/// RichTextBox, because this one renders crispy for
/// unknown reason.
/// </summary>
private void RebuildUnderlyingRichTextBox()
{
string rtfBackup = this.richTextBox != null ? this.richTextBox.Rtf : string.Empty;
if (this.richTextBox != null)
{
this.richTextBox.Dispose();
}
if ((this.ShapeDrawAction & ShapeDrawAction.Fill) == ShapeDrawAction.Fill)
{
this.richTextBox = new RichEdit50Opaque();
}
else
{
this.richTextBox = new RichEdit50Transparent();
}
this.richTextBox.Rtf = rtfBackup;
this.textLength = this.richTextBox.TextLength;
this.handleToRichTextBox = this.richTextBox.Handle;
}
/// <summary>
/// Prevents a default instance of the VGRichText class from being created.
/// Parameterless constructor. Used for serialization.
/// </summary>
private VGRichText()
{
this.richTextBox = new RichEdit50Opaque();
this.textLength = this.richTextBox.TextLength;
this.handleToRichTextBox = this.richTextBox.Handle;
}