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ax = 10; bx = 20; ConsoleWriteLine("ax {0}, bx {1}", ax, bx); a = b; bx = 30; ConsoleWriteLine("ax {0}, bx {1}", ax, bx); } }

This code will now create the required tab pages for each image, resulting in the dialog shown previously in figure 11.2. The complete implementation of the menuImages_Click handler is shown in the subsequent code. Since the individual lines were discussed in the previous tables, additional commentary is not provided. The annotated set of lines in this code is referenced in the TRY IT! text following the code.

The output is shown here:

private void menuImages_Click(object sender, System.EventArgs e) { Form imagesDlg = new Form(); TabControl tcImages = new TabControl(); imagesDlg.SuspendLayout(); tcImages.SuspendLayout(); // Create a tab page for each photo image on foreach (Photograph photo in _album) the page { string shortFileName = Path.GetFileName(photo.FileName); TabPage newPage = new TabPage(shortFileName); newPage.SuspendLayout(); // Create the PictureBox for this photo PictureBox pbox = new PictureBox(); pbox.BorderStyle = System.Windows.Forms.BorderStyle.Fixed3D; pbox.Dock = DockStyle.Fill;

a = b;

the structure variables a and b are still separate and distinct That is, a does not refer to or relate to b in any way other than containing a copy of b s value This would not be the case if a and b were class references For example, here is the class version of the preceding program:

pbox.Image = photo.Image; pbox.SizeMode = PictureBoxSizeMode.StretchImage; newPage.Controls.Add(pbox); newPage.ToolTipText = photo.FileName; tcImages.TabPages.Add(newPage); newPage.ResumeLayout(); } // Initialize the tab control tcImages.Dock = DockStyle.Fill; tcImages.HotTrack = true; tcImages.ShowToolTips = true; // Initialize the form imagesDlg.Controls.Add(tcImages); imagesDlg.ShowInTaskbar = false; imagesDlg.Size = new Size(400, 300); imagesDlg.Text = Images in + Path.GetFileName(_album.FileName); tcImages.ResumeLayout(); imagesDlg.ResumeLayout(); // Display the dialog as modal and ignore any result imagesDlg.ShowDialog(); imagesDlg.Dispose(); }

// Use a class using System; // Now a class class MyClass { public int x; } // Now show a class object assignment class ClassAssignment { static void Main() { MyClass a = new MyClass(); MyClass b = new MyClass(); ax = 10; bx = 20; ConsoleWriteLine("ax {0}, bx {1}", ax, bx); a = b; bx = 30;

Compile and run your program to see this new dialog. This dialog is resizable, and the controls automatically resize with the window since we set the Dock property to Fill for our controls.

Part I:

ConsoleWriteLine("ax {0}, bx {1}", ax, bx); } }

TRY IT!

The output from this version is shown here:

The TabControl here is created with the default behavior. You can change the location and style for the tabs by altering the Alignment and Appearance properties. Try setting these properties to alternate values to see how the control then appears. Also set the Multiline property to true and resize the form to see how multiple rows of tabs are displayed. For a more complicated change, you will note that each image is displayed in a PictureBox control much like an image was displayed way back in chapter 2. This, of course, has the problem that the image is stretched and distorted as the window is resized. Fix this by replacing the use of the PictureBox control in the prior code block with a Paint event handler for the TabPage object. This code is annotated as b in the prior code block with Display the image on the page. As part of this change, assign the photo to the Tag property of the newPage object so you can retrieve this photo in the Paint handler. The replaced code should look something like the following:

Figure 6-8

As you can see, after the assignment of b to a, both variables refer to the same object the one originally referred to by b

// Assign a Paint event handler to draw this photo newPage.Tag = photo; newPage.Paint += new System.EventHandler(this.newPage_Paint);