T.S. Bradley .NET

Minimize Event — How to determine if a Form was minimized

Problem

You want to determine if a Form was minimized or maximized.

Solution

Handle the Form.Resize event (inherited from Control.Resize), check the Form.WindowState property for a value of FormWindowState.Minimized.

Discussion

Form does not have a Minimized, Maximized, nor Restore event. Using the Resize event & WindowState properties you are able to determine if the form was minimized, maximized or restored.

Example

Determine if a form was minimized, maximized or restored.

This example does attempt to differentiate between restoring a minimized or maximized form and resizing a “normal” form.

    Protected Overrides Sub OnResize(ByVal e As System.EventArgs)
        MyBase.OnResize(e)
        Select Case Me.WindowState
            Case FormWindowState.Normal
                MessageBox.Show("Form was restored or resized", Application.ProductName)
            Case FormWindowState.Minimized
                MessageBox.Show("Form was minimized", Application.ProductName)
            Case FormWindowState.Maximized
                MessageBox.Show("Form was maximized", Application.ProductName)
        End Select
    End Sub