TreeView.AfterLabelEdit Événement

Définition

Se produit une fois le texte de l'étiquette du nœud d'arbre modifié.Occurs after the tree node label text is edited.

public:
 event System::Windows::Forms::NodeLabelEditEventHandler ^ AfterLabelEdit;
public event System.Windows.Forms.NodeLabelEditEventHandler AfterLabelEdit;
member this.AfterLabelEdit : System.Windows.Forms.NodeLabelEditEventHandler 
Public Custom Event AfterLabelEdit As NodeLabelEditEventHandler 

Type d'événement

NodeLabelEditEventHandler

Exemples

L’exemple de code suivant permet à l’utilisateur de modifier les nœuds d’arbre non racine à l’aide d’un ContextMenu .The following code example lets the user edit nonroot tree nodes by using a ContextMenu. Quand l’utilisateur clique avec le bouton droit de la souris, le TreeNode à cette position est déterminé et stocké dans une variable nommée mySelectedNode .When the user right clicks the mouse, the TreeNode at that position is determined and stored in a variable named mySelectedNode. Si un nœud d’arbre non racine a été sélectionné, il est mis dans un état modifiable, ce qui permet à l’utilisateur de modifier l’étiquette du nœud.If a nonroot tree node was selected, it is put into an editable state, which allows the user to edit the node label. Une fois que l’utilisateur a cessé de modifier l’étiquette du nœud d’arbre, le nouveau texte de l’étiquette est évalué et enregistré.After the user stops editing the tree node label, the new label text is evaluated and saved. Pour cet exemple, plusieurs caractères sont considérés comme non valides dans le texte de l’étiquette.For this example, several characters are considered not valid in the label text. Si l’un des caractères non valides figure dans la chaîne de l’étiquette ou si la chaîne est vide, l’utilisateur est informé de l’erreur et l’étiquette est retournée à son texte précédent.If one of the invalid characters is in the label string, or the string is empty, the user is notified of the error and the label is returned to its previous text.

   /* Get the tree node under the mouse pointer and 
      save it in the mySelectedNode variable. */
private:
   void treeView1_MouseDown( Object^ /*sender*/, System::Windows::Forms::MouseEventArgs^ e )
   {
      mySelectedNode = treeView1->GetNodeAt( e->X, e->Y );
   }

   void menuItem1_Click( Object^ /*sender*/, System::EventArgs^ /*e*/ )
   {
      if ( mySelectedNode != nullptr && mySelectedNode->Parent != nullptr )
      {
         treeView1->SelectedNode = mySelectedNode;
         treeView1->LabelEdit = true;
         if (  !mySelectedNode->IsEditing )
         {
            mySelectedNode->BeginEdit();
         }
      }
      else
      {
         MessageBox::Show( String::Concat( "No tree node selected or selected node is a root node.\n",
            "Editing of root nodes is not allowed." ), "Invalid selection" );
      }
   }

   void treeView1_AfterLabelEdit( Object^ /*sender*/,
      System::Windows::Forms::NodeLabelEditEventArgs^ e )
   {
      if ( e->Label != nullptr )
      {
         if ( e->Label->Length > 0 )
         {
            array<Char>^ temp0 = {'@','.',',','!'};
            if ( e->Label->IndexOfAny( temp0 ) == -1 )
            {
               
               // Stop editing without canceling the label change.
               e->Node->EndEdit( false );
            }
            else
            {
               /* Cancel the label edit action, inform the user, and 
                  place the node in edit mode again. */
               e->CancelEdit = true;
               MessageBox::Show( String::Concat( "Invalid tree node label.\n",
                  "The invalid characters are: '@','.', ',', '!'" ),
                  "Node Label Edit" );
               e->Node->BeginEdit();
            }
         }
         else
         {
            /* Cancel the label edit action, inform the user, and 
               place the node in edit mode again. */
            e->CancelEdit = true;
            MessageBox::Show( "Invalid tree node label.\nThe label cannot be blank",
               "Node Label Edit" );
            e->Node->BeginEdit();
         }
      }
   }
/* Get the tree node under the mouse pointer and
   save it in the mySelectedNode variable. */
private void treeView1_MouseDown(object sender,
  System.Windows.Forms.MouseEventArgs e)
{
   mySelectedNode = treeView1.GetNodeAt(e.X, e.Y);
}

private void menuItem1_Click(object sender, System.EventArgs e)
{
   if (mySelectedNode != null && mySelectedNode.Parent != null)
   {
      treeView1.SelectedNode = mySelectedNode;
      treeView1.LabelEdit = true;
      if(!mySelectedNode.IsEditing)
      {
         mySelectedNode.BeginEdit();
      }
   }
   else
   {
      MessageBox.Show("No tree node selected or selected node is a root node.\n" +
         "Editing of root nodes is not allowed.", "Invalid selection");
   }
}

private void treeView1_AfterLabelEdit(object sender,
         System.Windows.Forms.NodeLabelEditEventArgs e)
{
   if (e.Label != null)
   {
     if(e.Label.Length > 0)
     {
        if (e.Label.IndexOfAny(new char[]{'@', '.', ',', '!'}) == -1)
        {
           // Stop editing without canceling the label change.
           e.Node.EndEdit(false);
        }
        else
        {
           /* Cancel the label edit action, inform the user, and
              place the node in edit mode again. */
           e.CancelEdit = true;
           MessageBox.Show("Invalid tree node label.\n" +
              "The invalid characters are: '@','.', ',', '!'",
              "Node Label Edit");
           e.Node.BeginEdit();
        }
     }
     else
     {
        /* Cancel the label edit action, inform the user, and
           place the node in edit mode again. */
        e.CancelEdit = true;
        MessageBox.Show("Invalid tree node label.\nThe label cannot be blank",
           "Node Label Edit");
        e.Node.BeginEdit();
     }
   }
}
' Get the tree node under the mouse pointer and
' save it in the mySelectedNode variable. 
Private Sub treeView1_MouseDown(sender As Object, _
  e As System.Windows.Forms.MouseEventArgs)
        
   mySelectedNode = treeView1.GetNodeAt(e.X, e.Y)
End Sub    
    
Private Sub menuItem1_Click(sender As Object, e As System.EventArgs)
   If Not (mySelectedNode Is Nothing) And _
     Not (mySelectedNode.Parent Is Nothing) Then
      treeView1.SelectedNode = mySelectedNode
      treeView1.LabelEdit = True
      If Not mySelectedNode.IsEditing Then
         mySelectedNode.BeginEdit()
      End If
   Else
      MessageBox.Show("No tree node selected or selected node is a root node." & _
        Microsoft.VisualBasic.ControlChars.Cr & _
        "Editing of root nodes is not allowed.", "Invalid selection")
   End If
End Sub    
    
Private Sub treeView1_AfterLabelEdit(sender As Object, _
  e As System.Windows.Forms.NodeLabelEditEventArgs)
   If Not (e.Label Is Nothing) Then
      If e.Label.Length > 0 Then
         If e.Label.IndexOfAny(New Char() {"@"c, "."c, ","c, "!"c}) = -1 Then
            ' Stop editing without canceling the label change.
            e.Node.EndEdit(False)
         Else
            ' Cancel the label edit action, inform the user, and
            ' place the node in edit mode again. 
            e.CancelEdit = True
            MessageBox.Show("Invalid tree node label." & _
              Microsoft.VisualBasic.ControlChars.Cr & _
              "The invalid characters are: '@','.', ',', '!'", _
              "Node Label Edit")
            e.Node.BeginEdit()
         End If
      Else
         ' Cancel the label edit action, inform the user, and
         ' place the node in edit mode again. 
         e.CancelEdit = True
         MessageBox.Show("Invalid tree node label." & _
           Microsoft.VisualBasic.ControlChars.Cr & _
           "The label cannot be blank", "Node Label Edit")
           e.Node.BeginEdit()
      End If
   End If
End Sub 

Remarques

Pour plus d’informations sur la façon de gérer les événements, consultez gestion et déclenchement d’événements.For more information about how to handle events, see Handling and Raising Events.

S’applique à

Voir aussi