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Vwa.Page.centerViewOnShape Method

Last modified: June 27, 2011

Applies to: SharePoint Server 2010

Sets the position of the page so that the specified shape is centered in the viewport.

var value = Page.centerViewOnShape(string shapeID)

shapeID A string that specifies the identifier of the shape to be centered in the viewport.

Void Returns nothing.

You can use the Vwa.Shape.GetId method to get the identifier of the shape you want to specify.

A shape is centered in the viewport when the center of the shape's bounding box overlaps the viewport's center.

For more information about how to add a Visio Web Access Web Part to a SharePoint Web Parts page, see Customizing Visio Web Drawings in the Visio Web Access Web Part.

The following example adds a handler to the Vwa.shapeselectionchanged event that creates either an HTML or a XAML transparent overlay on the selected shape, depending on the display mode.

<script type="text/javascript">

// Hook into the AJAX Sys.Application.load event.
Sys.Application.add_load(onApplicationLoad)

// Define global variables.
var vwaControl;
var vwaPage;
var vwaShapes;
var currentlyAnnotatedShape;  

// Capture a reference to the current session of the Visio Web Access Web Part.
function onApplicationLoad() {
    try{
        vwaControl= new Vwa.VwaControl(getVWAWebPartID());
        vwaControl.addHandler("diagramcomplete", onDiagramComplete);
    }
    catch(err){
        alert(err);
    }
}

// Search the SharePoint page to get the WebPartID# for the Visio Web Access Web Part.
function getVWAWebPartID() {
    var divArray = document.getElementsByTagName("div");
    var webPartElementID;
    for (var i = 0; i < divArray.length; i++) {
        var node = divArray[i];
        if (node.className == "VisioWebAccess") {
            webPartElementID = node.parentNode.parentNode.id;
            break;
        }
    }
    return webPartElementID;
}

// Capture references to the global variables and register a handler for shapeselectionchanged event.
function onDiagramComplete() {
    try{
        vwaPage = vwaControl.getActivePage();
        vwaShapes = vwaPage.getShapes(); 
        vwaControl.addHandler("shapeselectionchanged", onShapeSelectionChanged);
    }
    catch(err){
        alert(err);
    }
}

function onShapeSelectionChanged(source, args){
    try{
        // Ignore the shapeselectionchanged event raised when the selection is cleared.
        if (args != null && args != Sys.EventArgs.Empty){

            // Get the value of the display mode for the Visio Web Access Web Part.
            var displayMode = vwaControl.getDisplayMode();

            // Remove any existing overlay from the diagram.
            removeAnnotation();
            currentlyAnnotatedShape = vwaShapes.getItemById(args);

            // Test to see what the current display mode is.
            if (displayMode == 1) {
                
                // The display mode is Silverlight; add a XAML overlay.
                currentlyAnnotatedShape.addOverlay(
                    "Overlay", 
                    "<Rectangle Height=\"" + currentlyAnnotatedShape.getBounds().height + "\"" + 
                    " Width=\"" + currentlyAnnotatedShape.getBounds().width + "\"" + 
                    " Stroke=\"Black\" StrokeThickness=\"1\" Fill=\"#88FF0000\"" + 
                    " RadiusX=\"0.0\" RadiusY=\"0.0\"\/>",
                    1, 
                    1,
                    currentlyAnnotatedShape.getBounds().width,
                    currentlyAnnotatedShape.getBounds().height);
            }
            else {
                
                // The display mode is raster format; add an HTML overlay.
                currentlyAnnotatedShape.addOverlay(
                    "Overlay", 
                    "<div id=\"HTMLDiv\" style=\"width: 100%; height:" + 
                    "100%;background-color:#FF0000;z-order:32;" + 
                    "filter:alpha(opacity=30);\"><\/div>", 
                    1, 
                    1,
                    currentlyAnnotatedShape.getBounds().width,
                    currentlyAnnotatedShape.getBounds().height);
            }
            
            // Re-center the drawing on the selected shape.
            vwaPage.centerViewOnShape(currentlyAnnotatedShape.getId());
        }
    }
    catch(err){
        alert(err);
    }
}

// Remove any existing overlay.
function removeAnnotation() {
    if (typeof(currentlyAnnotatedShape)!="undefined") {
            currentlyAnnotatedShape.removeOverlay("Overlay");
    } 
}
</script>

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