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Figure 15-22. Generating the UDT classes Once you have done that, you will be able to see the wizard shown in Figure 15-23. This wizard will generate .NET classes in a variety of languages for Oracle UDTs.

private void lbl_MouseUp(Object sender, System.Windows.Forms.MouseEventArgs e) { if (e.Button == MouseButtons.Right) { // This event was caused by a right-click. // Here is a good place to show a context menu. } } In the MouseMove event, however, the Button property indicates all the buttons that are currently depressed. That means that this property could take on more than one value from the MouseButtons enumeration. To test for a button, you need to use bitwise arithmetic. private void lbl_MouseMove(Object sender, System.Windows.Forms.MouseEventArgs e) { if ((e.Button & MouseButtons.Right) == MouseButtons.Right) { // The right mouse button is currently being held down. if ((e.Button & MouseButtons.Left) == MouseButtons.Left) { // You can get here only if both the left and the right mouse buttons // are currently held down. } } } Every control also provides a MousePosition, MouseButtons, and ModifierKeys property for information about the mouse and keyboard. The MouseButtons and ModifierKeys properties return information related to the last received message. The MousePosition property returns information about the current location of the mouse pointer, not the position where it was when the event was triggered. Additionally, the MousePosition property uses screen coordinates, not control coordinates, although you can translate between the two with the Form.PointToClient() and Form.ClientToPoint() methods. There s one other detail to be aware of with mouse events. When a control receives a MouseDown event, it captures the mouse. That means it will continue to receive other mouse events (like MouseMove), even if the mouse pointer is moved off the bounds of the control. This continues until the user releases the mouse button and the MouseUp event fires. Intuitively, this behavior makes sense, but it s worth noting.

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On the flip side of the coin, when a process needs to modify the data contained in the resource, or write to the resource, a different type of lock intent is used: an exclusive, or write, lock. This informs the database server that the process intends to change the resource, and any other processes that need access to the resource must wait until these changes have been made. When an exclusive lock intent is received, the database server must look at the counter maintained in the lock. If the counter is greater than zero, the database server modifies the state

The AnimatedButtonBase distinguishes among four states. An ordinary button appears in Normal state. MouseOver state occurs when the mouse is moved over the button, and Pushed occurs when the button is clicked (the mouse button is currently pressed down). Additionally, the button can be placed into a Disabled state, at which point it is essentially inactive and does not respond to user actions. public enum States { Normal, MouseOver, Pushed, Disabled } Clearly, the whole idea of the AnimatedButtonBase control is that it changes its rendering when it moves from one state to another. However, it s possible that the button might be repeatedly placed into the same state. This may occur in the design environment or if some code is reapplying a default. In this case, a refresh should not be triggered. To facilitate this pattern, the AnimatedButtonBase has a State property. When this property is set, it checks it the value has changed, and triggers a refresh if it has. All the other code in the AnimatedButtonBase control must then work through the State property to ensure that this automatic refresh happens appropriately. // Begin in normal state. private States state = States.Normal; // This property procedure ensures the control is // invalidated only when the state changes. private States State { get { return state; } set { if (state != value) { state = value; Invalidate(); } } } You can bridge the gap between the Enabled property and the Disabled state like this:

Figure 15-23. The UDT Custom Class Wizard Click the Next button to proceed. You should be able to see the screen displayed in Figure 15-24. This screen allows you to specify the name of the class and class files that will be generated by ODT.NET.

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