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MainForm has a StatusStrip control at the bottom, so the user can be informed about any longrunning activity that is occurring. Also, when a long-running activity is going on, the mouse cursor should be changed to indicate that the application is busy.
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An easy way to handle this is to create an object that implements IDisposable. This object would update both the status display and mouse cursor, and then reset them when it is disposed. The result is that anywhere in the UI, code can be written like this: using (StatusBusy busy = new StatusBusy("Working ")) { // do long-running task here } When the object is created, it sets the status display on MainForm, and it resets the text when it is disposed. Similarly, when the object is created, it sets the mouse cursor to a busy cursor, and resets it when disposed. To do this, it needs to be able to access the MainForm object. Exposing the MainForm instance is accomplished by adding a static property named Instance to the MainForm class: private static MainForm _main; internal static MainForm Instance { get { return _main; } } The form s constructor sets the _main field to a reference of the form: _main = this; This way, the MainForm object can be used by any code in the UI, including the StatusBusy class: public class StatusBusy : IDisposable { private string _oldStatus; private Cursor _oldCursor; public StatusBusy(string statusText) { _oldStatus = MainForm.Instance.StatusLabel.Text; MainForm.Instance.StatusLabel.Text = statusText; _oldCursor = MainForm.Instance.Cursor; MainForm.Instance.Cursor = Cursors.WaitCursor; } // IDisposable private bool _disposedValue = false; // To detect redundant calls protected void Dispose(bool disposing) { if (!_disposedValue) if (disposing) { MainForm.Instance.StatusLabel.Text = _oldStatus; MainForm.Instance.Cursor = _oldCursor; } _disposedValue = true; }
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public void Dispose() { // Do not change this code. // Put cleanup code in Dispose(bool disposing) above Dispose(true); GC.SuppressFinalize(this); } } When a StatusBusy object is created, it sets the status text and mouse cursor, storing the old values for later use: _oldStatus = MainForm.Instance.StatusLabel.Text; MainForm.Instance.StatusLabel.Text = statusText; _oldCursor = MainForm.Instance.Cursor; MainForm.Instance.Cursor = Cursors.WaitCursor; Then, when the object is disposed, the status text and cursor are reset to their previous values: MainForm.Instance.StatusLabel.Text = _oldStatus; MainForm.Instance.Cursor = _oldCursor; This is one of the simplest ways to implement powerful status notification and cursor handling for the user in a Windows Forms UI.
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The final bit of common functionality implemented in MainForm allows the user to log into or out of the application. It is important to realize that the ProjectTracker application allows unauthorized or guest users to view certain data, and so the user can interact with the application even if they haven t logged in. The login process is triggered when the application first loads, and when the user clicks the Login button on the menu. In both cases, a DoLogin() method is called to handle the actual login/ logout behavior: private void DoLogin() { ProjectTracker.Library.Security.PTPrincipal.Logout(); if (this.LoginToolStripButton.Text == "Login") { LoginForm loginForm = new LoginForm(); loginForm.ShowDialog(this); } System.Security.Principal.IPrincipal user = Csla.ApplicationContext.User; if (user.Identity.IsAuthenticated) { this.LoginToolStripLabel.Text = "Logged in as " + user.Identity.Name; this.LoginToolStripButton.Text = "Logout"; } else { this.LoginToolStripLabel.Text = "Not logged in"; this.LoginToolStripButton.Text = "Login"; }
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// reset menus, etc. ApplyAuthorizationRules(); // notify all documents foreach (Control ctl in Panel1.Controls) if (ctl is WinPart) ((WinPart)ctl).OnCurrentPrincipalChanged(this, EventArgs.Empty); } Before doing anything else, this method ensures that the CurrentPrincipal property of the Thread is set to an unauthenticated PTPrincipal object: ProjectTracker.Library.Security.PTPrincipal.Logout(); This way, if the user s credentials are invalid, she can at least use the application as an unauthenticated user. Recall that the data portal requires that the principal object inherit from Csla.Security. BusinessPrincipalBase. PTPrincipal meets this requirement, and so the current principal is set to an unauthenticated PTPrincipal object by calling the Logout() method. Next, the text of the button on the menu is checked. If the text is Login, then a login process is initiated. The login process is actually handled by a Login dialog form, which is shown to the user as a modal dialog. That dialog prompts the user for their credentials and calls PTPrincipal.Login() (as implemented in 8) to validate them. The result is that the CurrentPrincipal property on the Thread object will either be an authenticated PTPrincipal or an unauthenticated PTPrincipal. The status of the principal object is used to determine whether the user is logged in or not: if (user.Identity.IsAuthenticated) { this.LoginToolStripLabel.Text = "Logged in as " + user.Identity.Name; this.LoginToolStripButton.Text = "Logout"; } else { this.LoginToolStripLabel.Text = "Not logged in"; this.LoginToolStripButton.Text = "Login"; } If the user was authenticated, then the button text is changed to Logout and the user s name is displayed in the menu. Otherwise, the button text is changed to Login, and text indicating that the user isn t logged in is displayed. In any case, an ApplyAuthorizationRules() method is called so that MainForm can update its display based on the user s identity (or lack thereof ). Then all the active user controls are notified that the principal has changed: // reset menus, etc. ApplyAuthorizationRules(); // notify all documents foreach (Control ctl in Panel1.Controls) if (ctl is WinPart) ((WinPart)ctl).OnCurrentPrincipalChanged(this, EventArgs.Empty); Each user control is responsible for handling this event and responding appropriately. Recall that the WinPart base control implements the OnCurrentPrincipalChanged() method and subsequently raises a protected event to the code in the user control.
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