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Before we venture into the StatusBar class, it is worth looking at the classes behind this and all other Windows Forms controls. In chapter 3 we saw how the Menu class derived from the Object, MarshalByRefObject, and Component classes. The hierarchy for the StatusBar class is shown in figure 4.2.
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Figure 4.2 The StatusBar class hierarchy includes the base class for all Windows Forms controls: the Control class.
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THE CONTROL CLASS
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.NET Table 4.1 Control class
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The Control class for Windows Forms is a component with a visual representation on the desktop. This class is part of the System.Windows.Forms namespace, and inherits from the System.ComponentModel.Component class. This class encapsulates the standard functionality used by all Windows Forms controls. AllowDrop Anchor BackColor ContextMenu Controls ClientRectangle Cursor Enabled Location Parent TabIndex TabStop Text Visible BringToFront GetNextControl Invalidate PointToClient Click Public Events KeyPress MouseUp Paint Gets or sets whether to allow drag and drop operations in this control. Drag and drop operations are discussed in chapter 18. Gets or sets the anchor setting for the control. The Dock property gets or sets the dock setting for the control. Gets or sets the background color of the control. Gets or sets the context menu for the control. Gets or sets the collection of controls contained by this control. Gets the client area of the control. The DisplayRectangle property gets the display area. Gets or sets the Cursor to display when the mouse is over the control. Gets or sets whether the control is enabled. Gets or sets the location of the control. The edges are available via the Top, Bottom, Left, and Right properties. Gets or sets the parent of this control. Gets or sets the tab index of the control. Gets or sets whether the user can use the Tab key to give the focus to the control. Gets or sets the text associated with this control. Gets or sets whether control is visible. This also affects any controls contained by this control. Brings the control to the front of the z-order. A similar
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SendToBack method also exists.
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Public Properties
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Public Methods
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Returns the next or previous control in the tab order. Invalidates all or part of the control and forces a paint message to be sent to it. Converts a screen location to client coordinates. Occurs when the control is clicked. Occurs when a key is pressed while the control has focus. Occurs when a mouse button is released within the control. Occurs when all or part of the control should be repainted.
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STATUS BARS
The Control class extends the Component class we saw in chapter 3. All controls are components, and therefore support the IComponent and IDisposable interfaces. Controls can act as containers for other controls, although not all controls actually do so. The premier example of such a container is the Form class, which we have been using for our application window all along. The class hierarchy for the Form class is discussed in chapter 7. All controls are also disposable. When you are finished with a control, you should call the Dispose method inherited from the Component class to clean up any nonmemory resources used by the control. The Control class forms the basis for all windows controls in .NET, and provides many of the properties, methods, and events we have already seen such as the Left, Top, Width, and Height properties, the Invalidate method, and the Click event. An overview of the Control class is provided in .NET Table 4.1. Note that only a portion of the many members of this class are shown in the table. Consult the online documentation for the complete list of members. The StatusBar class is just one of many controls derived from the Control class. We will look at the StatusBar class in more detail in a moment, and other control classes throughout the rest of the book.
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