How do I detect if a System.Windows.Forms.Label with AutoEllipsis is actually displaying ellipsis?
I have a Windows Forms Application where I display some client data in a Label. I have set label.AutoEllipsis = true.
If the text is longer than the label, it looks like this:Some Text
Some longe... // label.Text is actually "Some longer Text"
// Full text is displayed in a tooltip
which is what I want.
But now I want to know if the label makes use of the AutoEllipsis feature at runtime. How do I achive that?
Solution
Thanks to max. Now I wa开发者_C百科s able to create a control that try to fit the whole text in one line. If someone is interested, here's the code:
Public Class AutosizeLabel
Inherits System.Windows.Forms.Label
Public Overrides Property Text() As String
Get
Return MyBase.Text
End Get
Set(ByVal value As String)
MyBase.Text = value
ResetFontToDefault()
CheckFontsizeToBig()
End Set
End Property
Public Overrides Property Font() As System.Drawing.Font
Get
Return MyBase.Font
End Get
Set(ByVal value As System.Drawing.Font)
MyBase.Font = value
currentFont = value
CheckFontsizeToBig()
End Set
End Property
Private currentFont As Font = Me.Font
Private Sub CheckFontsizeToBig()
If Me.PreferredWidth > Me.Width AndAlso Me.Font.SizeInPoints > 0.25! Then
MyBase.Font = New Font(currentFont.FontFamily, Me.Font.SizeInPoints - 0.25!, currentFont.Style, currentFont.Unit)
CheckFontsizeToBig()
End If
End Sub
Private Sub ResetFontToDefault()
MyBase.Font = currentFont
End Sub
End Class
Could need some fine tuning (make the step size and the minimum value configurable with designer visible Properties) but it works pretty well for the moment.
private static bool IsShowingEllipsis(Label label)
{
return label.PreferredWidth > label.Width;
}
In fact, your Lable could be multiline. In this case, label.PreferredWidth wouldn't help. But you can use:
internal static bool IsElipsisShown(this Label @this)
{
Size sz = TextRenderer.MeasureText(@this.Text, @this.Font, @this.Size, TextFormatFlags.WordBreak);
return (sz.Width > @this.Size.Width || sz.Height > @this.Size.Height);
}
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