Move Shapes with Arrow Keys

Environment

Product

RadDiagram for ASP.NET AJAX

Description

If project requires to move the shapes of the Diagram by pressing the arrow keys, you can achieve it by following the steps below:

1. Handle the client-side Load event of the Diagram and check whether the selected item is a shape.
2. If the clicked object is a shape, assign a handler to the standard keyDown event of the window object.
3. Use the `bounds()`` method of the Shape to move the shape depending on the pressed key,.

Solution

ASP.NET

        <telerik:RadDiagram ID="RadDiagram1" runat="server">
            <ClientEvents OnClick="attachHandlers" />
            <LayoutSettings Enabled="true" Type="Tree" Subtype="Right">
            </LayoutSettings>
            <ShapesCollection>
                <telerik:DiagramShape Id="s1">
                    <ContentSettings Text="S1" />
                </telerik:DiagramShape>
                <telerik:DiagramShape Id="s2">
                    <ContentSettings Text="S2" />
                </telerik:DiagramShape>
            </ShapesCollection>
            <ConnectionsCollection>
                <telerik:DiagramConnection>
                    <FromSettings ShapeId="s1" />
                    <ToSettings ShapeId="s2" />
                </telerik:DiagramConnection>
            </ConnectionsCollection>
        </telerik:RadDiagram>

        <script>
            var $ = $telerik.$;

            function attachHandlers(args) {
                var shape = args.item;

                if (shape instanceof kendo.dataviz.diagram.Shape) {
                    if (!shape.from) {
                        $(window).keydown(moveShape)
                    }
                }
            }

            function moveShape(event) {

                if (event.keyCode > 40 || event.keyCode < 37)
                    return;

                var diagram = $find("<%=RadDiagram1.ClientID%>").get_kendoWidget();
                var shapes = diagram.select();

                if (event.keyCode && shapes) {

                    for (var i = 0; i < shapes.length; i++) {
                        var bounds = shapes[i].bounds();

                        var x = bounds.x;
                        var y = bounds.y;
                        switch (event.keyCode) {
                            case 37:
                                bounds.x = bounds.x - 5;
                                break;
                            case 39:
                                bounds.x = bounds.x + 5;
                                break;
                            case 38:
                                bounds.y = bounds.y - 5;
                                break;
                            case 40:
                                bounds.y = bounds.y + 5;
                                break;
                        }
                        shapes[i].bounds(bounds);
                    }
                }
            }
        </script>