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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.

6:

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

Next, look closely at this line of code from inside Main( ):

houseAreaPerPerson();

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.

70 0015 0003

This statement invokes the AreaPerPerson( ) method on house That is, it calls AreaPerPerson( ) relative to the object referred to by house, by use of the dot operator When a method is called, program control is transferred to the method When the method terminates, control is transferred back to the caller, and execution resumes with the line of code following the call In this case, the call to houseAreaPerPerson( ) displays the area-per-person of the building defined by house In similar fashion, the call to officeAreaPerPerson( ) displays the area-per-person of the building defined by office Each time AreaPerPerson( ) is invoked, it displays the area-per-person for the specified object There is something very important to notice inside the AreaPerPerson( ) method: The instance variables Area and Occupants are referred to directly, without use of the dot operator When a method uses an instance variable that is defined by its class, it does so directly, without explicit reference to an object and without use of the dot operator This is easy to understand if you think about it A method is always invoked relative to some object of its class Once this invocation has occurred, the object is known Thus, within a method, there is no need to specify the object a second time This means that Area and Occupants inside AreaPerPerson( ) implicitly refer to the copies of those variables found in the object that invokes AreaPerPerson( )

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 SystemWindowsForms 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.

(which it won t for all of the examples in this chapter) If Occupants were zero, then a divisionby-zero error would occur In 13, you will learn about exceptions, which are C# s approach to handling errors, and see how to watch for errors that can occur at runtime

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.