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CHAPTER 11 CASE STUDY 1: A SYSTEM BROWSER
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public FormMain() { InitializeComponent(); navigatorFolders = new NavigatorFolders(); panelFolders.Controls.Add(navigatorFolders); navigatorFolders.Dock = DockStyle.Fill; navigatorFolders.OnFolderChanged += new SystemBrowser.NavigatorFolders.FolderChangedHandler(ShowFolderPath); navigatorFolders.OnMessage += new SystemBrowser.NavigatorFolders.MessageHandler(ShowMessage); navigatorFolders.OnProgress += new SystemBrowser.NavigatorFolders.ProgressHandler(UpdateProgress); } private void ShowFolderPath(string theFolderPath) { labelFolderPath.Text = theFolderPath; } private void ShowMessage(string theMessage) { labelMessages.Text = theMessage; } private void UpdateProgress(int thePercentComplete) { progressBar1.Value = thePercentComplete; progressBar1.Update(); } private void textBoxFolderToSelect_KeyPress(object sender, KeyPressEventArgs e) { if (e.KeyChar != '\r') return; e.Handled = true; // to prevent the TextBox from beeping navigatorFolders.SelectFolder(textBoxFolderToSelect.Text); } private void buttonPopulate_Click(object sender, System.EventArgs e) { navigatorFolders.Populate(@"C:\"); } private void buttonSelectParentFolder_Click(object sender , System.EventArgs e) { navigatorFolders.SelectParentFolder(); } }
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CHAPTER 11 CASE STUDY 1: A SYSTEM BROWSER
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VB .NET Public Class FormMain Inherits System.Windows.Forms.Form Private _navigatorFolders As NavigatorFolders Private Sub ShowFolderPath(ByVal theFolderPath As String) labelFolderPath.Text = theFolderPath End Sub Private Sub ShowMessage(ByVal theMessage As String) labelMessages.Text = theMessage End Sub Private Sub UpdateProgress(ByVal thePercentComplete As Integer) progressBar1.Value = thePercentComplete progressBar1.Update() End Sub Private Sub textBoxFolderToSelect_KeyPress(ByVal sender As Object, _ ByVal e As System.Windows.Forms.KeyPressEventArgs) _ Handles textBoxFolderToSelect.KeyPress If e.KeyChar <> vbCr Then Return e.Handled = True ' to prevent the TextBox from beeping _navigatorFolders.SelectFolder(textBoxFolderToSelect.Text) End Sub Private Sub buttonPopulate_Click(ByVal sender As System.Object, _ ByVal e As System.EventArgs) _ Handles buttonPopulate.Click _navigatorFolders.Populate("C:\") End Sub Private Sub buttonSelectParentFolder_Click(ByVal sender As System.Object, _ ByVal e As System.EventArgs) _ Handles buttonSelectParentFolder.Click _navigatorFolders.SelectParentFolder() End Sub Public Sub New() MyBase.New() 'This call is required by the Windows Form Designer. InitializeComponent() _navigatorFolders = New NavigatorFolders panelFolders.Controls.Add(_navigatorFolders) _navigatorFolders.Dock = DockStyle.Fill AddHandler _navigatorFolders.OnFolderChanged, AddressOf ShowFolderPath AddHandler _navigatorFolders.OnMessage, AddressOf ShowMessage AddHandler _navigatorFolders.OnProgress, AddressOf UpdateProgress End Sub End Class
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CHAPTER 11 CASE STUDY 1: A SYSTEM BROWSER
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The ContentFileList Test Fixture
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ContentFileList shows the contents of a folder as a list of folders and files. Figure 11-26 shows the user interface of the test fixture.
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Figure 11-26. The user interface of the ContentFileList test fixture ContentFileList has four inputs and two outputs. The inputs are the public methods Populate, Add, ShowIcons, and ShowDetails. The outputs are the events OnFolderDoubleClicked and OnMessage. The two buttons on the test fixture are wired to ContentFileList.Populate and ContentFileList.Add. When the user double-clicks a folder, an OnFolderDoubleClicked event is fired and handled by the test fixture. The name of the double-clicked folder is displayed in the middle of the form. The test fixture also handles the OnMessage event. The payload is a message, which is displayed at the bottom of the form. Figure 11-27 shows the test fixture s wiring diagram.
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ContentFileList
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Populate Add
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ShowIcons
ShowDetails
TestFixtureContentFileList.FormMain
ContentFileList
OnFolderDoubleClicked OnMessage
FolderDoubleClicked
Message
ShowFolderPath
ShowMessage
Figure 11-27. The wiring diagram of the ContentFileList test fixture Listing 11-20 shows the salient code of the test fixture in C# and VB .NET.
CHAPTER 11 CASE STUDY 1: A SYSTEM BROWSER
Listing 11-20. The Salient Code of the Test Fixture C# public class FormMain : System.Windows.Forms.Form { ContentFileList contentFileList; public FormMain() { InitializeComponent(); contentFileList = new ContentFileList(); contentFileList.OnFolderDoubleClicked += new ContentFileList.FolderDoubleClickedHandler(ShowFolderPath); contentFileList.OnMessage += new ContentFileList.MessageHandler(ShowMessage); panelContent.Controls.Add(contentFileList); contentFileList.Dock = DockStyle.Fill; contentFileList.Populate(textBoxFolder.Text); } void ShowFolderPath(string thePath) { labelFolderDoubleClicked.Text = thePath; } private void ShowMessage(string theMessage) { labelMessages.Text = theMessage; } private void textBoxFolder_KeyPress(object sender, System.Windows.Forms.KeyPressEventArgs e) { if (e.KeyChar == '\r') // the Enter key { contentFileList.Populate(textBoxFolder.Text); e.Handled = true; // to prevent TextBox from beeping } } private void buttonPopulate_Click(object sender, System.EventArgs e) { contentFileList.Populate(textBoxFolder.Text); } private void buttonAdd_Click(object sender, System.EventArgs e) { contentFileList.Add(textBoxFileToAdd.Text); }
CHAPTER 11 CASE STUDY 1: A SYSTEM BROWSER
private void radioButtonShowIcons_CheckedChanged(object sender, System.EventArgs e) { SetMode(); } private void radioButtonShowDetails_CheckedChanged(object sender, System.EventArgs e) { SetMode(); } void SetMode() { if (radioButtonShowIcons.Checked) contentFileList.ShowIcons(); else contentFileList.ShowDetails(); } }
VB .NET Public Class FormMain Inherits System.Windows.Forms.Form Private _contentFileList As ContentFileList Public Sub New() MyBase.New() _contentFileList = New ContentFileList 'This call is required by the Windows Form Designer. InitializeComponent() AddHandler _contentFileList.OnFolderDoubleClicked, AddressOf ShowFolderPath AddHandler _contentFileList.OnMessage, AddressOf ShowMessage panelContent.Controls.Add(_contentFileList) _contentFileList.Dock = DockStyle.Fill End Sub Sub ShowFolderPath(ByVal thePath As String) labelFolderDoubleClicked.Text = thePath End Sub Private Sub ShowMessage(ByVal theMessage As String) labelMessages.Text = theMessage End Sub
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