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Begin by setting the reference to the .dll files in an fsi style: #I #r #r #r @"C:\Program Files\Reference Assemblies\Microsoft\Framework\v3.0" ;; @"PresentationCore.dll" ;; @"PresentationFramework.dll" ;; @"WindowsBase.dll" ;; Next, you must alter the changePositions function to use a mutable function: // mutable function that is used within changePositions function let mutable f = (fun (t : float) (x : float) (y : float) -> 0.0) // function for changing the plane over time let changePositions () = let dispatcherTimer = new DispatcherTimer() dispatcherTimer.Tick.Add (fun e -> let t = (float DateTime.Now.Millisecond) / 2000.0 let newPositions = mesh.Positions |> Seq.map (fun position -> let z = f t position.X position.Y new Point3D(position.X, position.Y, z)) mesh.Positions <- new Point3DCollection(newPositions)) dispatcherTimer.Interval <- new TimeSpan(0,0,0,0,100) dispatcherTimer.Start() Finally, you show the window using its .Show() method rather than the Application class s Run method; be careful that you set its Topmost property to true so that it is easy to interact with the window and see the results: // show the window, set it the top, and activate the function that will // set it moving window.Show() window.Topmost <- true changePositions () Finally, you need to define some other functions to map across the plane. This can be any function that takes three floating-point numbers (the first representing the time and the next two representing the X and Y coordinates, respectively) and returns a third floating-point that represents the Z coordinate. I m particularly fond of using sine and cosine functions here because these generate interesting wave patterns. The following code includes some examples of what you might use, but please feel free to invent your own:

To trigger Help programmatically, you need to use the static ShowHelp() method of the Help class (in the SystemWindowsForms namespace) The Help class works analogously to the HelpProvider in fact, the HelpProvider uses the Help class behind the scenes when the user presses F1 There are several overloaded versions of the ShowHelp() method The simplest requires a Help file name (or URL) and the control that is the parent for the Help dialog (this second parameter is required for low-level Windows operating system reasons) Here s an example that shows the testhlp file: HelpShowHelp(this, "testhlp"); Additionally, you can use a version of the ShowHelp() method that requires a HelpNavigator, one that requires a keyword, or one that requires both a keyword and a HelpNavigator Here s an example that could be used for context-sensitive Help: HelpShowHelp(this, "testhlp", HelpNavigatorTopic, "about.

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htm"); To save yourself some work when using this technique with the HelpProvider, you would probably retrieve these values from the HelpProvider For example, you might provide a button on your form that invokes the default form Help: private void cmdHelp_Click(object sender, SystemEventArgs e) { HelpShowHelp(this, hlpHelpNamespace, hlpGetHelpNavigator(this), hlpGetHelpKeyword(this)); } Similarly, you might use a right-click context menu for a control that provides the control s default Help: private void mnuHelp_Click(object sender, SystemEventArgs e) { Control ctrl = mnuLabelSourceControl; HelpShowHelp(ctrl, hlpHelpNamespace, hlpGetHelpNavigator(ctrl), hlpGetHelpKeyword(ctrl)); } This menu event handler is written using the SourceControl property, which means it s generic enough to be used with any control When the menu is clicked, it retrieves the control attached to the context menu, and gets its assigned Help keyword.

let cosXY _ x y = Math.Cos(x * Math.PI) * Math.Cos(y * Math.PI) let movingCosXY (t : float) x y = Math.Cos((x + t) * Math.PI) * Math.Cos((y - t) * Math.PI) You can then easily apply these functions to the plane by updating the mutable function: f <- movingCosXY Using this technique produces the image you see in Figure 8-9.

You will now be able to see the new drive, along with any other drives you already had as part of your storage pool. As you can see in the example in Figure 8-7, the status of my new drive is healthy, and my server storage pool total is 699.52 GB.

Now that you are this far, it s possible to unshackle yourself completely from the HelpProvider class Just handle the HelpRequested event of any form or control Then launch the appropriate Help programmatically with the Help class Now that you ve seen how it can be done, why would you want to do it You ll examine two of the most common reasons in the next two sections..

Help files, like any other external resource, change (or need to be localized). You don t want to embed information such as topic URLs all over your user interface, because they are difficult

and time-consuming to update. Instead, you can use a basic form event handler that calls a method in a custom AppHelp class. It would look something like this: private void form1_HelpRequested(object sender { Global.Help.ShowHelp(this); } HelpEventArgs e)

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