SetTitleBar method to the MainForm class. in Visual C#

Generation Data Matrix ECC200 in Visual C# SetTitleBar method to the MainForm class.

using System.IO;

private void SetTitleBar() { Version ver = new Version( Application.ProductVersion); if (_album.FileName == null) { this.Text = String.Format("MyPhotos {0:#}.{1:#}", ver.Major, ver.Minor); } else { string baseFile = Path. GetFileNameWithoutExtension( _album.FileName); this.Text = String.Format( "{0} - MyPhotos {1:#}.{2:#}", baseFile, ver.Major, ver.Minor); } }

Define a default title bar when no album file is set. When an album file is set, include the base file name in the title bar.

The Path class represents an object stored on disk, whether a file or directory object. This class is sealed, and is part of the System.IO namespace. The Path class contains static methods for creating and managing disk objects. DirectorySeparatorChar A platform-specific directory separator character. This is the backslash character \ on Windows systems. A platform-specific array of characters. Each character is not permitted in a file system path. A platform-specific path separator character. The semicolon ; character on Windows systems. Changes or removes the file extension for a file. Returns the directory path of a file. Returns the extension of a file. Returns the file and extension parts of a file. Returns the file name without its extension. Returns the fully qualified path for a given path. Returns the root of a given path. Returns a unique temporary file name and creates an empty file with that name on disk. Determines whether a path includes a file extension.

ChangeExtension GetDirectoryName GetExtension GetFileName GetFileNameWithoutExtension Public Static Methods GetFullPath GetPathRoot GetTempFileName

HANDLING THE NEW MENU With the ability to manage an album file and directory in place, this is as good a place as any to implement a Click handler for our New menu. We will use our new SetTitleBar method to initialize the title bar for the application. This method is used here as well as later in this chapter to initialize the title bar when the current album changes.

CREATE A CLICK EVENT HANDLER FOR THE NEW MENU Action 1 In the MainForm.cs [Design] window, add a Click event handler for the New menu. In this handler, dispose of the existing album and create a new one. Note: This really is poor design, since we throw away any changes to the existing album. We will fix this in chapter 8 when we discuss the MessageBox class. 3 4 5 Initialize the application title bar. Invalidate the current window.

} // Set the application title bar SetTitleBar(); this.Invalidate(); menuNew_Click(this, EventArgs.Empty);

private void menuNew_Click (object sender, System.EventArgs e) { if (_album != null) _album.Dispose(); _album = new PhotoAlbum();

Note: The static EventArgs.Empty property provides an empty EventArgs instance for use when calling event handlers from your code. The initial title bar is now set as part of the

We have made a few changes to our MainForm constructor here. To make sure we are all on the same page (so to speak), your constructor in Visual Studio should now look something like the following:

public MainForm() { // // Required for Windows Form Designer support // InitializeComponent(); // Additional Form initialization DefineContextMenu(); menuNew_Click(this, EventArgs.Empty); }

With this infrastructure in place, we can turn our attention to the methods required in the PhotoAlbum class.

So far we have used the MyPhotoAlbum library to support the creation and manipulation of an album in memory. At this point, we would like to preserve this album by storing it on disk. In this section we will handle the Save menu item to do just this. In

the next section we will implement an Open menu handler to allow such an album to be reloaded and used at a later time. We have already seen how the OpenFileDialog class is used to locate image files. As you might expect, .NET provides a SaveFileDialog class to store information to a file. A summary of this class is shown in .NET Table 6.5.