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// Tracks when drag mode is on. private bool isDraggingA = false; private bool isDraggingB = false; // The ellipse shape controls. private EllipseShape ellipseA, ellipseB; private void Recipe08_04_Load(object sender, EventArgs e) { // Create and configure both ellipses. ellipseA = new EllipseShape(); ellipseA.Width = ellipseA.Height = 100; ellipseA.Top = ellipseA.Left = 30; ellipseA.BackColor = Color.Red; this.Controls.Add(ellipseA); ellipseB = new EllipseShape(); ellipseB.Width = ellipseB.Height = 100; ellipseB.Top = ellipseB.Left = 130; ellipseB.BackColor = Color.Azure; this.Controls.Add(ellipseB); // Attach both ellipses to the same set of event handlers. ellipseA.MouseDown += Ellipse_MouseDown; ellipseA.MouseUp += Ellipse_MouseUp; ellipseA.MouseMove += Ellipse_MouseMove; ellipseB.MouseDown += Ellipse_MouseDown; ellipseB.MouseUp += Ellipse_MouseUp; ellipseB.MouseMove += Ellipse_MouseMove; } private void Ellipse_MouseDown(object sender, MouseEventArgs e) { // Get the ellipse that triggered this event. Control control = (Control)sender; if (e.Button == MouseButtons.Left) { control.Tag = new Point(e.X, e.Y); if (control == ellipseA) { isDraggingA = true; } else { isDraggingB = true; } } }

Heavy*

private void Ellipse_MouseUp(object sender, MouseEventArgs e) { isDraggingA = false; isDraggingB = false; } private void Ellipse_MouseMove(object sender, MouseEventArgs e) { // Get the ellipse that triggered this event. Control control = (Control)sender; if ((isDraggingA && control == ellipseA) || (isDraggingB && control == ellipseB)) { // Get the offset. Point point = (Point)control.Tag; // Move the control. control.Left = e.X + control.Left - point.X; control.Top = e.Y + control.Top - point.Y; } } } } Figure 8-4 shows the user about to drag an ellipse.

Years ago, while working for a small software development company, I encountered an interesting device known as a smart card. As part of my job, I created a Java API to interact with smart cards via a smart card reader. This API detected card insertions and removals, and provided the means to acquire a user s credentials from an inserted smart card.

Moderate**

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Leverage the automatic scroll capabilities of the System.Windows.Forms.Panel control by setting Panel.AutoScroll to true and placing a System.Windows.Forms.PictureBox control with the image content inside the Panel.

Light***

Because the card reader s software consisted of Windows dynamic link libraries (DLLs), I used the Java Native Interface (JNI) to provide the bridge between Java and the native code that interacted with these DLLs a messy business. My job would have been much easier if the version of Java that I worked with had provided an API for communicating with smart cards. Fortunately, Sun has finally addressed this situation by providing the Smart Card I/O API and the SunPCSC security provider in its Java SE 6 reference implementation.

The Panel control has built-in scrolling support, as shown in recipe 8-1. If you place any controls in it that extend beyond its bounds and you set Panel.AutoScroll to true, the panel will show scroll bars that allow the user to move through the content. This works particularly well with large images. You can load or create the image in memory, assign it to a picture box (which has no intrinsic support for scrolling), and then show the picture box inside the panel. The only consideration you need to remember is to make sure you set the picture box dimensions equal to the full size of the image you want to show.

The Distinct method is part of the LINQ feature of the .NET Framework, which we used in the previous recipe to select items from a collection. The Distinct method returns an instance of IEnumerable, which can be converted into an array or collection with the ToArray, ToList, and ToDictionary methods. You can provide an instance of IEqualityComparer as an argument to the Distinct method in order to provide your rules for identifying duplicates.

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Caution Because the Smart Card I/O API and SunPCSC provider are not part of the Java SE 6 specification, they are only guaranteed to be available as part of Sun s reference implementation.

The following example removes duplicates from a List<Fruit> using a custom implementation of IEqualityComparer passed to the List.Distinct method and prints out the unique items: using using using using System; System.Collections.Generic; System.Linq; System.Text;

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