Intersoft Community - WebAqua - Fatal error occurs when StackButton is added after WebFishEye loaded

Fatal error occurs when StackButton is added after WebFishEye loaded

Glayaar — Tue, 02 Mar 2010 22:23:14 GMT

In your scenario, you will need to invoke the RefreshUIElement function in the WebFishEye in order to render the new stack button. Here is the modified snippet for the AddStackButtonWithDelay

private void AddStackButtonWithDelay(double delayDuration)
{
    Storyboard toolbarDelay = new Storyboard() { BeginTime = TimeSpan.FromSeconds(delayDuration) };
    toolbarDelay.Completed += (s, e) => { AddStackButton(); _MainToolbar.RefreshUIElement(); };
    toolbarDelay.Begin();
}

During OnClick event handler, you will also need to invoke this method as well. However, in the current version of WebFishEye this will result in an error. The proposed fix is to set the event parameter Handle property to True, currently the Handle property is not available. This fix will be available in the next build of WebFishEye.

Fatal error occurs when StackButton is added after WebFishEye loaded

Rico — Tue, 02 Mar 2010 09:34:52 GMT

It doesn't seem that you've grasped the full scope of the issue. The button collection seems to be unmodifiable from any event or code after it has been loaded. NOT JUST A CLICK EVENT. For example, the following code demonstrates adding a StackButton on a 5 second delay. This will also crash the FishEye when the button is clicked.

        public MainPage()
        {
            InitializeComponent();

            AddStackButton();
            AddStackButtonWithDelay(5);
        }


        private void AddStackButtonWithDelay(double delayDuration)
        {
            Storyboard toolbarDelay = new Storyboard() { BeginTime = TimeSpan.FromSeconds(delayDuration) };
            toolbarDelay.Completed += (s, e) => AddStackButton();
            toolbarDelay.Begin();
        }


        
        private void AddStackButton()
        {
            WebFishEyeButton button = _MainToolbar.FindButton("cmdTools");

            if (button.StackButtons == null)
            {
                button.StackButtons = new ObservableCollection<WebFishEyeStackButton>();
            }

            string stackText = string.Format("StackButton{0}", _StackCounter++);

            WebFishEyeStackButton stackButton = new WebFishEyeStackButton();
            stackButton.ItemName = stackText;
            stackButton.Text = stackText;
            stackButton.ImageSource = new BitmapImage(new Uri("Resources/toolbox.128.png", UriKind.Relative));

            button.StackButtons.Add(stackButton);
        }

Fatal error occurs when StackButton is added after WebFishEye loaded

Glayaar — Mon, 01 Mar 2010 23:39:06 GMT

Currently WebAqua will cause an error if we try to modify button collection during click event handler. A bug report has been submitted to the developer. We will inform you if there is any update or progress regarding this issue.

Fatal error occurs when StackButton is added after WebFishEye loaded

Rico — Mon, 01 Mar 2010 15:57:29 GMT

There is a serious issue with the WebAqua’s StackButtons. Adding StackButtons at runtime to any Button.StackButtons collection after the toolbar has been shown, will result in a fatal exception from the WebAqua assembly. Specifically the exception will surface the next time the button containing the newly added StackButton is clicked. Here is the resulting unhandled error.

System.NullReferenceException: Object reference not set to an instance of an object.
   at ISNet.Silverlight.WebAqua.WebFishEye.ƒ__(WebFishEyeButton button)
   at ISNet.Silverlight.WebAqua.WebFishEye.š__(Object sender, MouseEventArgs e)
   at MS.Internal.CoreInvokeHandler.InvokeEventHandler(Int32 typeIndex, Delegate handlerDelegate, Object sender, Object args)
   at MS.Internal.JoltHelper.FireEvent(IntPtr unmanagedObj, IntPtr unmanagedObjArgs, Int32 argsTypeIndex, String eventName)

WebAqua version == 2.0.1000.220

To reproduce the error, simply call add a StackButton from a delayed (post load) event such as a user button click.