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If you have actually read this book from the beginning, you will recall that we looked at the Menu class hierarchy in chapter 3 and the StatusBar hierarchy in chapter 4. 3 introduced some of the low-level classes used by Windows Forms, and chapter 4 extended this hierarchy to include the Control class. The Form class is based on additional extensions to enable scrolling and containment. The complete hierarchy is shown in figure 7.1.
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Figure 7.1 The Form class hierarchy extends the Control class discussed in chapter 4 with the functionality required for various kinds of application windows.
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As you can see in the figure, the ScrollableControl and ContainerControl classes extend the Control class discussed in chapter 4 to support functionality required by the Form class. The ScrollableControl class adds auto-scrolling capabilities, while the ContainerControl adds focus management on the contained set of controls, even when the container itself does not have the focus.
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THE SCROLLABLECONTROL CLASS You might think that all classes with scrolling support inherit from the ScrollableControl object. In fact, this class is only for objects which support automated scrolling for a contained set of Control objects. Controls such as ListBox, TextBox, and other controls that provide scrolling of their drawing area do so independently of this object using the ScrollBar class, which is unrelated to the ScrollableControl class. The TextBox and ListBox classes are discussed in chapters 9 and 10, respectively. The point here is that the ScrollableControl class is specifically designed for the scrolling support required by container objects such as forms and panels. A summary of this class is provided in the .NET Table 7.1. We will see the members of this class in action later in the chapter when we enable scrolling within our application.
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.NET Table 7.1 ScrollableControl class
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The ScrollableControl class represents a control that supports automated scrolling. This class is part of the System.Windows.Forms namespace and inherits from the System.Windows.Forms.Control class. This class is not typically used directly. Instead, derived classes such as Form and Panel are used. See .NET Table 4.1 on page 104 for a list of members inherited from the Control class. AutoScroll AutoScrollMargin Gets or sets whether the user can scroll the container to any contents placed outside of its visible boundaries. Gets or sets the extra margin to add to the container s contents for scrolling purposes. This ensures that the scrollable area goes slightly beyond the edge of any contained controls. Gets or sets the Size object representing the minimum height and width of the scrollbars in pixels. Gets or sets the Point within the virtual display area to appear in the upper left corner of the visible portion of the control. Gets or sets the extra padding for the inside border of this control when it is docked. Sets the AutoScrollMargin property. Gets or sets whether the horizontal scroll bar is visible. Gets or sets whether the vertical scroll bar is visible.
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Public Properties
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AutoScrollMinSize AutoScrollPosition
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DockPadding Public Methods Protected Properties SetAutoScrollMargin
HScroll VScroll
THE FORM CLASS We will skip over the ContainerControl class from figure 7.1 and jump straight to the Form class. The ContainerControl class simply adds functionality for focus management on the contained controls. For example, an ActiveControl property
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sets or gets the Control object that has the focus; while the ActivateControl method sets the focus to a specific control. The functionality is useful, but not as glamorous as scroll bars or forms, so we skip it.
.NET Table 7.2 Form class
The Form class represents any window that can be displayed by an application, including standard windows as well as modal or modeless dialog boxes and multiple document interface (MDI) windows. This class is part of the System.Windows.Forms namespace and inherits from the ContainerControl class. The contents of a form can be drawn directly by a program, consist of a collection of controls, or some combination of the two. These contents can also be larger than the visible area, with scrolling supported by the ScrollableControl class (see .NET Table 7 .1). Public Static Properties ActiveForm AcceptButton ControlBox DialogResult Icon IsMdiChild MaximizeBox Public Properties MaximumSize Menu Modal ShowInTaskBar StartPosition WindowState Gets the Form currently active in the application, or null if no Form is active. Gets or sets the button to invoke when the Enter key is pressed. Gets or sets whether a control box appears at the left of the title bar. Gets or sets the dialog result to return when the form is a modal dialog box. Gets or sets the icon for the form. Gets whether this form is an MDI child form. MDI forms are discussed in chapter 16. Gets or sets whether a Maximize button appears in the title bar of the form. Gets or sets the maximum size for a form. Gets or sets the MainMenu object for this form. Gets whether this form is displayed modally. Gets or sets whether the form is displayed in the Windows task bar. Gets or sets the initial position of the form when it is displayed. Gets or sets how the form is displayed on the desktop (normal, maximized, or minimized). Activates the form and gives it focus. Closes the form. Displays this form as a modal dialog box. Occurs when the form is about to close. Occurs when the form has lost the focus. Occurs before a form is initially displayed.
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