Classes That Expose System Settings in .NET

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Table 12-1 Classes That Expose System Settings
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Class SystemBrushes SystemColors SystemFonts SystemIcons SystemPens
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Description Exposes Brush objects that can be used to paint in the system colors. Exposes the system colors. Exposes the fonts used by the system. Exposes the icons used by the system. Exposes Pen objects that can be used to draw in the system colors.
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These classes monitor changes to the system settings and adjust correspondingly. For example, if you build an application that uses the SystemFonts class to determine all of the fonts, the fonts in the application will automatically be reset when the system set tings are changed.
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Ensure Compatibility with the High-Contrast Option
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The high-contrast option (which users can set themselves in the Control Panel) sets the Windows color scheme to provide the highest possible level of contrast in the user interface. This option is useful for users requiring a high degree of legibility. By using only system colors and fonts, you can ensure that your application is com patible with the high-contrast settings. You should also avoid the use of background images because these tend to reduce contrast in an application.
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Lesson 1: Implementing Accessibility
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Provide Documented Keyboard Access to All Features
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Your application should provide keyboard access for all features and comprehensive documentation that describes this access. Shortcut keys for controls and menu items, as well as setting the Tab order for controls on the user interface, allow you to imple ment keyboard navigation in your user interface. Documentation of these features is likewise important. A user must have some means of discovering keyboard access to features, whether that is through user interface cues or actual documentation.
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Provide Notification of the Keyboard Focus Location
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The location of the keyboard focus is used by accessibility aids such as Magnifier and Narrator. Thus, it is important that the application and the user have a clear under standing of where the keyboard focus is at all times. For most purposes, this function ality is provided by the .NET Framework, but when designing your program flow, you should incorporate code to set the focus to the first control on a form when the form is initially displayed, and the Tab order should follow the logical program flow.
Convey No Information by Sound Alone
Whereas sound is an important cue for many users, an application should never rely on conveying information by using sound alone. When using sound to convey infor mation, you should combine that with a visual notification such as flashing the form or displaying a message box.
Accessibility Properties of Windows Forms Controls
In addition to properties that affect the visual interface of a control, Windows Forms controls have five properties related to accessibility that determine how the control interacts with accessibility aids. These properties are summarized in Table 12-2.
Table 12-2 Accessibility Properties of Windows Controls
Property AccessibleDescription AccessibleName AccessibleRole
Description Contains the description that is reported to accessibility aids. Contains the name that is reported to accessibility aids. Contains the role that is reported to accessibility aids. This value is a member of the AccessibleRole enumera tion and is used by a variety of accessibility aids to deter mine what kind of user interface element an object is.
12
Enhancing Usability
Table 12-2 Accessibility Properties of Windows Controls
Property AccessibilityObject
Description Contains an instance of AccessibleObject, which provides information about the control to usability aids. This property is read-only and set by the designer. Contains a description of the default action of a control. This property cannot be set at design time and must be set in code.
AccessibleDefaultActionDescription
These properties provide information to accessibility aids about the role of the control in the application. Accessibility aids can then present this information to the user or make decisions about how to display the control.
Quick Check
1. What is the purpose of setting accessibility properties on Windows Forms controls 2. What are the best practices when designing for accessibility
Quick Check Answers
1. The accessibility properties provide information about the controls in your application to accessibility aids. 2. When designing for accessibility you should support standard system set tings, ensure compatibility with high-contrast mode, provide documented keyboard access for all features, provide notification for keyboard focus location, and convey no information by sound alone.
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