Exercice Visual Basic : Manipuler un Texte

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Public Class Form1
 Private Sub MenuItem1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MenuItem1.Click
        Clipboard.SetDataObject(Texte.SelectedText)
    End Sub

    Private Sub ContextMenu1_Popup(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles ContextMenu1.Popup

    End Sub

    Private Sub Button4_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button4.Click
        Dim a As New ColorDialog
        a.AnyColor = True 'permet d'apparaitre les couleurs de base seulment
        a.FullOpen = True 'pour aparaitre arc en ciel
        a.ShowHelp = True 'pour apparaitre l'icon d'aide
        a.Color = Texte.backcolor
        If a.ShowDialog = DialogResult.OK Then
            Texte.BackColor = a.Color
        End If
    End Sub

    Private Sub Button5_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button5.Click
        Dim a As New FontDialog
        a.ShowApply = True 'pour apparaitre le boton de "appliquer"
        a.ShowColor = True 'permet d'apparaitre "couleur" ds un textbox
        a.ShowEffects = True
        'a.AllowVerticalFonts = True
        a.Font = Texte.SelectionFont
        a.Color = Texte.SelectionColor
        If (a.ShowDialog() = DialogResult.OK) Then
            Texte.SelectionFont = a.Font
            Texte.SelectionColor = a.Color
        End If
    End Sub

    Private Sub Button2_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button2.Click
        Texte.SelectionAlignment = HorizontalAlignment.Center
    End Sub

    Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
        Texte.SelectionAlignment = HorizontalAlignment.Left
    End Sub

    Private Sub Button3_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button3.Click
        Texte.SelectionAlignment = HorizontalAlignment.Right
    End Sub

    Private Sub MenuItem2_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MenuItem2.Click
        Texte.Cut()
    End Sub

    Private Sub MenuItem3_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MenuItem3.Click
        Texte.Paste()
    End Sub

    Private Sub MenuItem4_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MenuItem4.Click
        Texte.SelectAll()
    End Sub

    Private Sub Button6_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button6.Click
        Dim a As MessageBox
        Dim b As MsgBoxResult
        b = a.Show("Voulez vous vraiment sortir????", "confirmation!!", MessageBoxButtons.YesNo, MessageBoxIcon.Question, MessageBoxDefaultButton.Button1)
        If b = MsgBoxResult.Yes Then
            End
        End If
    End Sub

    Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load

    End Sub

    Private Sub Form1_MouseUp(ByVal sender As Object, ByVal e As System.Windows.Forms.MouseEventArgs) Handles MyBase.MouseUp
        If e.Button = MouseButtons.Right Then
            Me.ContextMenu1.Show(Texte, New Point(e.X, e.Y))
        End If
    End Sub
End Class