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The code in UndoChangesComplete() sets the _bindingEdit flag, reestablishes the object s validation rules, and raises the PropertyChanged event for all properties on the object thus ensuring that data binding is aware that the object s state has changed The ValidationRules class will be implemented later in the chapter, but it manages a list of business rules for each property It also maintains a list of currently broken business rules The list of broken business rules is part of the object s state and is subject to n-level undo The list of rules associated with each property is really a list of delegate references, which can be broken by serialization To prevent any such issues, that list isn t subject to serialization or n-level undo Instead, after resetting the object s state with UndoChanges(), the business rules are simply reassociated with the properties by calling the AddBusinessRules() method.

The SetTarget() method is also called to ensure that ValidationRules has a current reference to the business object This will be much clearer later in the chapter as you look at the ValidationRules and BrokenRulesCollection classes..

The first thing you see in the sample is the use of open to access functionality from the namespace System.Windows.Forms: open System.Windows.Forms We discuss namespaces in more detail in 7. The earlier declaration simply means you can access any content under this path without quoting the long path. If it had not used open, you would have to write the following, which is obviously a little verbose: let form = new System.Windows.Forms.Form(Visible=true,TopMost=true, Text="Welcome to F#") You can also use open to access the contents of an F# module such as Microsoft.FSharp. Core.String without using long paths. We discuss modules in more detail in 7.

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The System.ComponentModel.IEditableObject interface is used by the Windows Forms data binding infrastructure to control undo operations in two cases: First, if an object is a child of a collection and is being edited in a grid control, the IEditableObject interface will be used so that the user can start editing a row of the grid (that is, the object) and then press Esc to undo any edits he s made on the row. Second, when binding controls from a Windows Form to an object s properties, the IEditableObject interface will be used to tell the object that editing has started. It will not be used to tell the object when editing is complete or if the user requests an undo. It s up to the UI code to handle these cases. When using data binding to bind an object to a form, you can allow the data binding infrastructure to tell the object that editing has started. I typically don t rely on that feature, preferring

function displayAbbreviations() { if (!document.getElementsByTagName || !document.createElement || !document.createTextNode) return false; var abbreviations = document.getElementsByTagName("abbr"); if (abbreviations.length < 1) return false; var defs = new Array(); for (var i=0; i<abbreviations.length; i++) { var current_abbr = abbreviations[i]; if (current_abbr.childNodes.length < 1) continue; var definition = current_abbr.getAttribute("title"); var key = current_abbr.lastChild.nodeValue; defs[key] = definition; } var dlist = document.createElement("dl"); for (key in defs) { var definition = defs[key]; var dtitle = document.createElement("dt"); var dtitle_text = document.createTextNode(key); dtitle.appendChild(dtitle_text); var ddesc = document.createElement("dd"); var ddesc_text = document.createTextNode(definition); ddesc.appendChild(ddesc_text); dlist.appendChild(dtitle); dlist.appendChild(ddesc); } if (dlist.childNodes.length < 1) return false; var header = document.createElement("h3"); var header_text = document.createTextNode("Abbreviations"); header.appendChild(header_text); var articles = document.getElementsByTagName("article"); if (articles.length == 0) return false; var container = articles[0]; container.appendChild(header); container.appendChild(dlist); } addLoadEvent(stripeTables); addLoadEvent(highlightRows); addLoadEvent(displayAbbreviations); The highlightRows and displayAbbreviations functions have been updated slightly: In highlightRows, instead of applying a style property directly, it uses the addClass function to apply the highlight class. This class is applied when the user hovers over a row. Before that, the function takes a snapshot of the old className property and stores it as a custom property called oldClassName. When the user moves off the table row, the className property is reset to the value of oldClassName.

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