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6. Although it is possible to control the type of lock placed on a resource, if you don t specify a lock type, MySQL s storage engines will choose the most appropriate lock level for you.

protected override void OnEnabledChanged(EventArgs e) { if (!Enabled) { State = States.Disabled; } else if (Enabled && State == States.Disabled) { State = States.Normal; } base.OnEnabledChanged(e); } It also makes sense to trigger a refresh when other details change that affect the button display. Currently, the AnimatedButtonBase control uses this technique only when the button text is changed. public override string Text { get { return base.Text; } set { if (value != base.Text) { base.Text = value; Invalidate(); } } }

Click the Next button again to proceed. This time ,the wizard will allow you to map each UDT attribute to the desired .NET data type, as shown in Figure 15-25. This can be useful when you want to pass a string to a property in the UDT class, for example, but have it save and retrieve data to and from the underlying UDT as an integer.

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To update the state of the button, the AnimatedButtonBase needs to handle several mouse events. You do this by overriding the OnMouseMove() and OnMouseLeave() methods. However, before implementing either of those methods, it s important to create one additional ingredient the HitTest() method. The HitTest() method allows you to create buttons that include clickable button content and nonclickable content on the same surface. Essentially, the HitTest() method returns true if the mouse cursor is positioned over a clickable area. In the simple implementation of AnimatedButtonBase, the entire control region is treated as clickable, and so HitTest() always returns true. However, derived controls can override this method to implement their own logic. // If you want to make only a portion of the button // clickable, this is the method to override. protected virtual bool HitTest(int X, int Y) { return true; }

of the lock and does not allow any other read locks to access the resource; instead, it tells these processes to wait until the writing process has finished. If the counter is greater than zero, the state of the lock is changed, preventing any new processes from accessing the resource, and the database server makes the write process wait until all read requests have finished accessing the resource and decrementing the internal counter. When the counter reaches zero, the database server lets the write request proceed.

Now, when the OnMouseMove() method is triggered, you need to call HitTest() to determine whether the mouse is over a clickable area. If so, the state is changed to MouseOver; if not, the state is set to Normal. If the button has been placed in a disabled state, this logic is bypassed altogether. protected override void OnMouseMove(System.Windows.Forms.MouseEventArgs e) { base.OnMouseMove(e); // Do nothing if the button is disabled. if (State == States.Disabled) return; if (HitTest(e.X, e.Y)) { if (State != States.Pushed) State = States.MouseOver; } else { State = States.Normal; } } Remember, as long as you change the state through the State property, you ensure a refresh is performed only if necessary. Similar logic is used when the mouse leaves the control altogether. However, there s no longer a need to call HitTest() on the control, because it s obvious the mouse pointer is no longer over a clickable region. protected override void OnMouseLeave(System.EventArgs e) { if (State != States.Disabled) State = States.Normal; } Finally, the OnMouseDown() and OnMouseUp() events change the state to Pushed and back to MouseOver: protected override void OnMouseDown(System.Windows.Forms.MouseEventArgs e) { // Do nothing if the button is disabled. if (State == States.Disabled) return; if (HitTest(e.X, e.Y)) { if ((e.Button & MouseButtons.Left) == MouseButtons.Left) { State = States.Pushed; Focus(); } } }

Figure 15-25. Specifying property details After you are finished, click the Next button to complete the wizard. A UDT class file named Employee.cs will be generated in your project. If you open this file, you will see something similar to Figure 15-26. Notice that the UDT attributes are represented as properties in this class.

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