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The InsertItem() method is called when an item is being added to the collection. The EditLevelAdded property is changed when a new child object is added to the collection, thus telling the child object the edit level at which it s being added. Recall that this property was implemented in BusinessBase to merely record the value so that it can be checked during undo operations. This value will be used in the collection s UndoChanges() and AcceptChanges() methods later on. Also notice that the child object s SetParent() method is called to make sure its parent reference is correct. This way, if needed, it can call the collection s RemoveChild() method to remove itself from the collection. The RemoveItem() method is called when an item is being removed from the collection. To support the concept of undo, the object isn t actually removed, because it might need to be restored later. Rather, a DeleteChild() method is called, passing the object being removed as a parameter. You ll see the implementation of this method shortly. For now, it s enough to know that it keeps track of the object in case it must be restored later.

This is the typical structure of a paint method, where the Model is tested to decide what should be drawn and the style to be used The drawing of the data samples is controlled by the timexunit and pixelsPerUnit variables, and then the inner recursive function drawSamples selects the visible samples and uses the DataSamples object to compute results You rely on the ability of the DataSamples class to interpolate data and not have to deal with discrete samples The core business of the paint method is often rather simple (having paid attention when defining the Model and the Controller of the control); it quickly becomes entangled in testing all the configuration properties to determine how the control should be rendered Listing 11-4 Drawing the Control override xOnPaint (e:PaintEventArgs) = let g = eGraphics // A helper function to size up strings let measure s = g.

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Programming languages are either interpreted or compiled. Languages like Java or C++ require a compiler. A compiler is a program that translates the source code written in a high-level language like Java into a file that can be executed directly by a computer. Interpreted languages don t require a compiler they just need an interpreter instead. With JavaScript, in the context of the World Wide Web, the web browser does the interpreting. The JavaScript interpreter in the browser executes the code directly from the source. Without the interpreter, the JavaScript code would never be executed. If there are any errors in the code written in a compiled language, those errors will pop up when the code is compiled. In the case of an interpreted language, errors won t become apparent until the interpreter executes the code. Although compiled languages tend to be faster and more portable than interpreted languages, they often have a fairly steep learning curve. One of the nice things about JavaScript is that it s relatively easy to pick up. Don t let that fool you, though: JavaScript is capable of some pretty complex programming operations. For now, let s take a look at the basics.

To ensure that the collection can properly undelete objects in case of an undo operation, it needs to keep a list of the objects that have been removed. The first step in accomplishing this goal is to maintain an internal list of deleted objects. Along with implementing this list, there needs to be a ContainsDeleted() method so that the business or UI logic can find out whether the collection contains a specific deleted object. BindingList<T> already includes a Contains() method so that the UI code can ask the collection if it contains a specific item. Since a BusinessListBase collection is unusual in that it contains two lists of objects, it s appropriate to allow client code to ask whether an object is contained in the deleted list, as well as in the nondeleted list: private List<C> _deletedList; [EditorBrowsable(EditorBrowsableState.Advanced)] protected List<C> DeletedList { get { if (_deletedList == null) _deletedList = new List<C>(); return _deletedList; } } [EditorBrowsable(EditorBrowsableState.Advanced)] public bool ContainsDeleted(C item) { return DeletedList.Contains(item); }

MeasureString(s, xFont) // Work out the size of the box to show the values let valBox = let minbox = measure (StringFormat(verticalLabelFormat, lastMin)) let maxbox = measure (StringFormat(verticalLabelFormat, lastMax)) let vbw = max minboxWidth maxboxWidth let vbh = max minboxHeight maxboxHeight SizeF(vbw, vbh) // Work out the size of the box to show the times let timeBox = let lasttime = xGetTime(initView + int64(visibleSamples)) let timelbl = StringFormat(timeFormat, lasttime) measure timelbl // Work out let plotBox let ltm let rbm the plot area for the graph = = leftTopMargin = rightBottomMargin.

Notice that the list of deleted objects is kept as a List<C> a strongly typed collection of child objects. That list is then exposed through a protected property so it is available to subclasses. Subclasses have access to the nondeleted items in the collection, so this just follows the same scoping model. The list object is created on demand to minimize overhead in the case that no items are ever removed from the collection.

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