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CHAPTER 11 CASE STUDY 1: A SYSTEM BROWSER
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public void Build() { // create the navigators for the left pane navigatorFolders = new NavigatorFolders(); navigatorSearch = new NavigatorSearch(); // create the content managers for the right pane contentFolders = new ContentFileList(); contentSearch = new ContentSearchResults(); // UI elements formMenuToolBar = new FormMenuToolBar(); statusBar = new StatusBar(); formMain = new FormMain(); // Coordinators cruise = new CoordinatorCruise(); shutdown = new CoordinatorShutdown(); coordinatorSearch = new CoordinatorSearch(formMain); // move the navigators and content viewers into FormMain formMain.NavigatorFolders = navigatorFolders; formMain.NavigatorSearch = navigatorSearch; formMain.ContentFolders = contentFolders; formMain.ContentSearch = contentSearch; // move the menu, toolbar and statusbar into FormMain formMain.Menu = formMenuToolBar.mainMenu; formMain.Toolbar = formMenuToolBar.panelToolBar; formMain.Statusbar = statusBar; } } Listing 11-4. The VB .NET Implementation of the Builder Public Class Builder ' there can only be one instance of the Builder Private Shared _singleton As Builder Public Shared ReadOnly Property Singleton() As Builder Get If _singleton Is Nothing Then _singleton = New Builder End If Return _singleton End Get End Property Public _binder As Binder Public _userSettings As UserSettings ' UI elements Public _formSplash As FormSplash Public _formMain As FormMain Public _formMenuToolBar As FormMenuToolBar
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CHAPTER 11 CASE STUDY 1: A SYSTEM BROWSER
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Public _statusBar As StatusBar ' Workers Public _navigatorFolders As NavigatorFolders Public _navigatorSearch As NavigatorSearch Public _contentFolders As ContentFileList Public _contentSearch As ContentSearchResults ' Coordinators Public _startup As CoordinatorStartup 'lifecycle: starting up state Public _shutdown As CoordinatorShutdown 'lifecycle: shutting down state Public _cruise As CoordinatorCruise 'lifecycle: cruising state Public _coordinatorSearch As CoordinatorSearch ' Public Sub New() _formSplash = New FormSplash _binder = New Binder(Me) _startup = New CoordinatorStartup _userSettings = New UserSettings End Sub Public Sub Build() ' create the navigators for the left pane _navigatorFolders = New NavigatorFolders _navigatorSearch = New NavigatorSearch ' create the content managers for the right pane _contentFolders = New ContentFileList _contentSearch = New ContentSearchResults ' UI elements _formMenuToolBar = New FormMenuToolBar _statusBar = New StatusBar _formMain = New FormMain ' Coordinators _cruise = New CoordinatorCruise _shutdown = New CoordinatorShutdown _coordinatorSearch = New CoordinatorSearch(_formMain) ' move the navigators and content viewers into FormMain _formMain.NavigatorFolders = _navigatorFolders _formMain.NavigatorSearch = _navigatorSearch _formMain.ContentFolders = _contentFolders _formMain.ContentSearch = _contentSearch ' move the menu, toolbar and statusbar into FormMain _formMain.Menu = _formMenuToolBar.mainMenu _formMain.Toolbar = _formMenuToolBar.panelToolBar _formMain.Statusbar = _statusBar End Sub End Class
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CHAPTER 11 CASE STUDY 1: A SYSTEM BROWSER
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Binder
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Binder wires the top-level objects together. All the wiring in SystemBrowser is fixed, except in one case: the signal Progress, emitted by NavigatorFolders to update the progress bar on the splash screen. After initialization, this signal is no longer used, so the Binder removes its wiring. All the other wiring is kept in place for the entire life cycle of the system. Listing 11-5 and Listing 11-6 show C# and VB .NET implementations of the Binder. Listing 11-5. The C# Implementation of the Binder public class Binder { private Builder builder; // a handler will be used only during startup // to show progress on the splash screen NavigatorFolders.ProgressHandler progressUpdater; public Binder(Builder theBuilder) { builder = theBuilder; progressUpdater = new NavigatorFolders.ProgressHandler(builder.formSplash.UpdateProgress); } public void Bind() { builder.formMenuToolBar.OnViewFolders += new FormMenuToolBar.UniversalHandler(builder.formMain.ShowFolders); builder.formMenuToolBar.OnViewFolders += new FormMenuToolBar.UniversalHandler(builder.userSettings.ShowFolders); builder.formMenuToolBar.OnViewSearch += new FormMenuToolBar.UniversalHandler(builder.formMain.ShowSearch); builder.formMenuToolBar.OnViewSearch += new FormMenuToolBar.UniversalHandler(builder.userSettings.ShowSearch); builder.formMenuToolBar.OnViewIcons += new FormMenuToolBar.UniversalHandler(builder.contentFolders.ShowIcons); builder.formMenuToolBar.OnViewIcons += new FormMenuToolBar.UniversalHandler(builder.contentSearch.ShowIcons); builder.formMenuToolBar.OnViewDetails += new FormMenuToolBar.UniversalHandler(builder.contentFolders.ShowDetails); builder.formMenuToolBar.OnViewDetails += new FormMenuToolBar.UniversalHandler(builder.contentSearch.ShowDetails); builder.formMenuToolBar.OnUpSelected += new FormMenuToolBar.UniversalHandler( builder.navigatorFolders.SelectParentFolder); builder.formMenuToolBar.OnAddressChanged += new FormMenuToolBar.AddressChangedHandler( builder.navigatorFolders.SelectFolder);
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CHAPTER 11 CASE STUDY 1: A SYSTEM BROWSER
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builder.navigatorFolders.OnFolderChanged += new NavigatorFolders.FolderChangedHandler(builder.contentFolders.Populate); builder.navigatorFolders.OnFolderChanged += new NavigatorFolders.FolderChangedHandler( builder.formMenuToolBar.ShowAddress); builder.navigatorFolders.OnMessage += new NavigatorFolders.MessageHandler(builder.statusBar.Message); builder.contentFolders.OnMessage += new ContentFileList.MessageHandler(builder.statusBar.Message); builder.contentFolders.OnFolderDoubleClicked += new ContentFileList.FolderDoubleClickedHandler( builder.navigatorFolders.SelectFolder); builder.coordinatorSearch.OnSearchRequested += new CoordinatorSearch.SearchRequestedHandler( builder.contentSearch.Clear); builder.coordinatorSearch.OnSearchStart += new ThreadStart(builder.navigatorSearch.Start); builder.coordinatorSearch.OnItemFound += new CoordinatorSearch.ItemFoundHandler(builder.contentSearch.Add); builder.coordinatorSearch.OnMessage += new CoordinatorSearch.MessageHandler(builder.statusBar.Message); builder.navigatorSearch.OnSearchRequested += new NavigatorSearch.SearchRequestedHandler( builder.formMenuToolBar.ShowAddress); builder.navigatorSearch.OnSearchRequested += new NavigatorSearch.SearchRequestedHandler( builder.coordinatorSearch.StartSearch); builder.navigatorSearch.OnItemFound += new NavigatorSearch.ItemFoundHandler(builder.coordinatorSearch.ItemFound); builder.navigatorSearch.OnMessage += new NavigatorSearch.MessageHandler(builder.coordinatorSearch.FireMessage); builder.contentSearch.OnMessage += new ContentSearchResults.MessageHandler(builder.statusBar.Message); } public void BindFormSplash() { builder.navigatorFolders.OnProgress += progressUpdater; } public void UnbindFormSplash() { builder.navigatorFolders.OnProgress -= progressUpdater; } }
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