Adding or deleting Diagram symbol.

[Ven]

Hi,

how do i determine when a new symbol or shape has been added, deleted or changed from one parent to another parent in syncfusion.winforms.diagram.

please provide some example.



Thanks and regards
Venkat.

[Varalakshmi R.S]

Hi Venket,

Thank you for your interest in syncfusion products.

Adding, deleting or changing a new symbol or shape from one parent to another parent in syncfusion.winforms.diagram can be determine by using “NodeCollectionChanging” event which triggered when the node collection is edited. Please refer the following code snippet to achieve this.

private void Form1_Load(object sender, EventArgs e)
{
 
    ((DiagramViewerEventSink)diagramWeb1.EventSink).NodeCollectionChanged += new CollectionExEventHandler(Form1_NodeCollectionChanged)((DiagramViewerEventSink)diagramWeb1.EventSink).NodeCollectionChanging += new CollectionExEventHandler(Form1_NodeCollectionChanging);
 
 
    RectangleF rect = new RectangleF(100, 100, 100, 100);
    RichTextNode richText = new RichTextNode("", rect);
    richText.Text = "Rich text box";
 
    NodeCollection nodeStack = new NodeCollection();
    nodeStack.Add(richText);
    MessageBox.Show(nodeStack.Count.ToString());
 
}

private void Form1_NodeCollectionChanging(CollectionExEventArgs e)
{
    MessageBox.Show("NodeCollectionChanging event fired");
}

Please refer the following documentation link to know more about NodeCollection events.
http://help.syncfusion.com/ug_83/User%20Interface/ASP.NET/Diagram/Documents/nodecollectionevents.htm

Please let us know if there are any concerns.

Regards,
Varalakshmi.R.S