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CHAPTER 11 CASE STUDY 1: A SYSTEM BROWSER
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public delegate void MessageHandler(string theMessage); public event MessageHandler OnMessage; private void FireMessage(string theMessage) { if (OnMessage != null) uiControl.Invoke(OnMessage, new object[] {theMessage}); } } Listing 11-18. How CoordinatorSearch Switches to the UI Thread Before Forwarding Notifications to UI Elements (VB .NET Code) Public Class CoordinatorSearch Private _uiControl As Control Public Sub New(ByVal theUiControl As Control) _uiControl = theUiControl End Sub Public Sub ItemFound(ByVal thePath As String, ByVal theCurrentCount As Integer) FireItemFound(thePath, theCurrentCount) If (theCurrentCount = 1) Then FireMessage("1 item found") Else FireMessage(String.Format("{0} items found", theCurrentCount)) End If End Sub Public Delegate Sub ItemFoundHandler(ByVal thePath As String, _ ByVal theCurrentCount As Integer) Public Event OnItemFound As ItemFoundHandler Sub FireItemFound(ByVal thePath As String, ByVal theCurrentCount As Integer) _uiControl.Invoke(New ItemFoundHandler(AddressOf DoFireItemFound), _ New Object() {thePath, theCurrentCount}) End Sub Sub DoFireItemFound(ByVal thePath As String, ByVal theCurrentCount As Integer) RaiseEvent OnItemFound(thePath, theCurrentCount) End Sub
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Public Delegate Sub MessageHandler(ByVal theMessage As String) Public Event OnMessage As MessageHandler Public Sub FireMessage(ByVal theMessage As String) _uiControl.Invoke(New MessageHandler(AddressOf DoFireMessage), _ New Object() {theMessage}) End Sub Sub DoFireMessage(ByVal theMessage As String) RaiseEvent OnMessage(theMessage) End Sub #End Region End Class
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CHAPTER 11 CASE STUDY 1: A SYSTEM BROWSER
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In the listings, the lines in bold show where the thread switching occurs. In .NET Windows Forms, all UI controls are derived from the class System.Windows.Forms.Control, which contains the method Control.Invoke. This method expects a delegate as a parameter. The uiControl variable is a reference to any UI control created on the UI thread. In SystemBrowser, FormMain is used, but you could use any other form or UI element. After switching to the UI thread, Control.Invoke calls the method referenced by the delegate. Systems developed for other component platforms, such as JavaBeans or Delphi, have their own ways to run methods on the user interface thread. The implementation details are different, but the concept is the same.
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Use Cases
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The remaining details of SystemBrowser are best described with use cases. I ll model each use case using wiring diagrams with numbered signals. See Figures 11-15 through 11-23.
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ContentFileList
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1. FolderChanged Populate
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FormMenuToolBar
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NavigatorFolders
1,2 FolderChanged OnFolderChanged
2. FolderChanged
ShowAddress
StatusBar
OnMessage
3. Message
Message
Show Folder Path.
Figure 11-15. Use case: The user changes the folder selected in the Folders navigator.
ContentFileList
FolderDoubleClicked
OnFolderDoubleClicked
NavigatorFolders
SelectFolder
If the Selected Folder Changes Here, the Signals in the Previous Use Case Will Be Sent.
Figure 11-16. Use case: The user double-clicks a folder in the Folders content pane.
CHAPTER 11 CASE STUDY 1: A SYSTEM BROWSER
ContentFileList
Message OnMessage
StatusBar
Message
Show Selected File's Size.
Figure 11-17. Use case: The user clicks a file in the Folders content pane.
ContentSearchResults
Message OnMessage
StatusBar
Message
Show Selected File's Size.
Figure 11-18. Use case: The user selects a file in the Search Results pane.
FormMenuToolBar
ViewFolders
FormMain
ShowFolders
OnViewFolders
Figure 11-19. Use case: The user clicks the Folders button on the toolbar.
FormMenuToolBar
ViewSearch OnViewSearch
FormMain
ShowSearch
Figure 11-20. Use case: The user clicks the Search button on the toolbar.
FormMenuToolBar
ParentSelected OnUpSelected
NavigatorFolders
SelectParentFolder
Figure 11-21. Use case: The user clicks the Up button on the toolbar.
CHAPTER 11 CASE STUDY 1: A SYSTEM BROWSER
W3 W1
FormMenuToolBar
1,2 ViewIcons 1. ViewIcons
ContentFileList
ShowIcons
ContentSearchResults
2. ViewIcons ShowIcons
OnViewIcons
Figure 11-22. Use case: The user selects the View Icons menu command.
W3 W1
FormMenuToolBar
1,2 ViewDetails 1. ViewDetails
ContentFileList
ShowDetails
ContentSearchResults
2. ViewDetails ShowDetails
OnViewDetails
Figure 11-23. Use case: The user selects the View Details menu command.
Testing the System
Four parts of SystemBrowser are complex enough to justify their own test fixture: NavigatorFolders, ContentFileList, NavigatorSearch, and ContentSearchResults. Since ContentFileList is very similar to ContentSearchResults, I won t show a test fixture for the latter. Although I m presenting the test fixtures after showing most of the implementation of SystemBrowser, it is important to use test fixtures during development. As features are added to a class or component, you ll most likely think about special situations that might need testing, such as boundary conditions on parameters, timing issues, and threading issues. Each time you recognize a situation that might need special handling, you should extend the test fixture to test for that situation. You should develop the test fixture and the classes you want to test in parallel, so when you deliver the final code to the source-code control system, it includes the final test-fixture code.
The NavigatorFolders Test Fixture
Let s start with the NavigatorFolders test fixture. You need to test the object s inputs and outputs. The inputs are the public methods, and the outputs are the events. NavigatorFolders has three public methods: Populate, SelectFolder, and SelectParentFolder. The class also has three events: OnFolderChanged, OnMessage, and OnProgress. I ll create the test fixture as a simple Windows application that hosts NavigatorFolders, calling its inputs and handling its events. Figure 11-24 shows the user interface of the test fixture.
CHAPTER 11 CASE STUDY 1: A SYSTEM BROWSER
Figure 11-24. The NavigatorFolders test fixture UI The center part of the UI contains the NavigatorFolders control. The wiring diagram in Figure 11-25 shows how the test fixture s main form is wired to NavigatorFolders.
NavigatorFolders
Populate SelectFolder SelectParentFolder Populate SelectFolder SelectParentFolder
TestFixtureNavigatorFolders.FormMain
NavigatorFolders
OnFolderChanged OnMessage OnProgress
FolderChanged Message Progress
ShowFolderPath ShowMessage UpdateProgress
Figure 11-25. The wiring diagram of the NavigatorFolders test fixture The test fixture s main form calls the NavigatorFolders inputs through the interface NavigatorFolders, so the diagram shows statically bound pins. The three events fired by NavigatorFolders are wired to methods that display the notification payloads on the screen. The FolderChanged payload is displayed at the top of FormMain. The Message payload is displayed at the bottom. The Progress payload is a percent-complete value, displayed in the progress bar on the right side of the status bar. Listing 11-19 shows the salient code of the test fixture in C# and VB .NET. Listing 11-19. The Salient Code of the Test Fixture C# public class FormMain : System.Windows.Forms.Form { NavigatorFolders navigatorFolders;
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