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CHAPTER 10 FUNCTIONAL ROLES
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// provide progress feedback FireProgressChangedHandler(i * 10); string message = string.Format("Loading component {0}", i); FireProgressChangedHandler(message); } } public void BindInfrastructure() { // wire all the infrastructure objects } public void BindUi() { // wire all the top-level objects } public delegate void ProgressChangedHandler(int theValue); public event ProgressChangedHandler OnProgressChanged; void FireProgressChangedHandler(int theValue) { if (OnProgressChanged == null) return; OnProgressChanged(theValue); } public delegate void ProgressChangedTextHandler(string theText); public event ProgressChangedTextHandler OnProgressTextChanged; void FireProgressChangedHandler(string theText) { if (OnProgressTextChanged == null) return; OnProgressTextChanged(theText); } }
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public class StartupCoordinator { enum StartupState {NoUi, Splash, NormalUi}; StartupState state; // shortcut property BuilderBinder BuilderBinder { get {return BuilderBinder.Singleton;} } // shortcut property FormSplash FormSplash { get {return BuilderBinder.Singleton.formSplash;} }
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CHAPTER 10 FUNCTIONAL ROLES
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// shortcut property FormMain FormMain { get {return BuilderBinder.Singleton.formMain;} } public StartupCoordinator() { state = StartupState.NoUi; } public void Run() { FormSplash.Show(); FormSplash.Update(); // otherwise it appears one piece at time state = StartupState.Splash; LoadInfrastructure(); LoadBasicUi(); LoadRemainderOfApp(); // we're done FormMain.StatusBarMessage("Ready"); } void LoadInfrastructure() { BuilderBinder.OnProgressChanged += new BuilderBinder.ProgressChangedHandler(builderBinder_OnProgressChanged); BuilderBinder.OnProgressTextChanged += new BuilderBinder.ProgressChangedTextHandler( builderBinder_OnProgressTextChanged); BuilderBinder.BuildInfrastructure(); } // get a skeletal UI up on the screen void LoadBasicUi() { BuilderBinder.BuildBasicUi(); FormMain.Show(); FormMain.Update(); // now the main UI is up: hide the splash screen state = StartupState.NormalUi; FormSplash.Hide(); } void LoadRemainderOfApp() { BuilderBinder.BuildRemainderOfApp(); }
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CHAPTER 10 FUNCTIONAL ROLES
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delegate void ValueHandler(int theValue); delegate void TextHandler(string theText); // event handler can be called on a background thread private void builderBinder_OnProgressChanged(int theValue) { ValueHandler handler = null; if (state == StartupState.Splash) // update formSplash handler = new ValueHandler(FormSplash.UpdateProgress); else if (state == StartupState.NormalUi) // update formMain handler = new ValueHandler(FormMain.UpdateProgress); else return; // update screen on UI thread FormSplash.Invoke(handler, new object[] {theValue}); } // event handler can be called on a background thread private void builderBinder_OnProgressTextChanged(string theText) { // we only handle textual progress when // the main UI is already on the screen if (state != StartupState.NormalUi) return; // update formMain on UI thread TextHandler handler = new TextHandler(FormMain.StatusBarMessage); FormMain.Invoke(handler, new object[] {theText}); } }
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public class RunCoordinator { // shortcut property BuilderBinder BuilderBinder { get {return BuilderBinder.Singleton;} } public void Run() { BuilderBinder.formMain.Closing += new CancelEventHandler(formMain_Closing); // app exits when this call completes Application.Run(BuilderBinder.formMain); }
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CHAPTER 10 FUNCTIONAL ROLES
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private void formMain_Closing(object sender, System.ComponentModel.CancelEventArgs e) { // to prevent the app from closing, do this // e.Cancel = true; // return; // let the app shut the app down FireExiting(); } public void HandleTopLevelEvents() { // handle the top-level events than occur during // the normal operation of the system... } public delegate void ExitingHandler(); public event ExitingHandler OnExiting; void FireExiting() { if (OnExiting == null) return; OnExiting(); } }
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public class ShutdownCoordinator { public void Run() { // disable the user interface during shutdown if (BuilderBinder.Singleton.formMain != null) BuilderBinder.Singleton.formMain.Visible = false; } } Listing 10-14. A VB .NET Implementation Using Separate Lifecycle State Coordinators Public Class LifecycleCoordinator 'the application's main entry point Shared Sub Main() Dim coordinator As New LifecycleCoordinator coordinator.Start() ' app exits when this call completes End Sub Enum LifecycleState StartingUp Running ShuttingDown End Enum
CHAPTER 10 FUNCTIONAL ROLES
Private state As LifecycleState ' shortcut property ReadOnly Property BuilderBinder() As BuilderBinder Get Return BuilderBinder.Singleton End Get End Property Public Sub Start() StartupSystem() RunSystem() ' app exits when this call completes End Sub Sub StartupSystem() state = LifecycleState.StartingUp BuilderBinder._startup.Run() End Sub Sub RunSystem() state = LifecycleState.Running AddHandler BuilderBinder._running.OnExiting, AddressOf ShutDownSystem BuilderBinder._running.Run() ' app exits when this call completes End Sub Sub ShutDownSystem() state = LifecycleState.ShuttingDown BuilderBinder._shutdown.Run() End Sub Public Sub ' ignore If state If state HandleWorkerEvent() worker events unless in the Running state = LifecycleState.StartingUp Then Return = LifecycleState.ShuttingDown Then Return
' handle the event... End Sub End Class
Public Class BuilderBinder Private Shared _singleton As BuilderBinder Public Shared ReadOnly Property Singleton() As BuilderBinder Get If _singleton Is Nothing Then _singleton = New BuilderBinder End If Return _singleton End Get End Property
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