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Screen-based controls, often simply called controls and sometimes called widgets, are the elements of a screen that constitute its body.
By definition, they are graphic objects that represent the properties or operations of other objects. A control may:
· Permit the entry or selection of a particular value.
· Permit the changing or editing of a particular value.
· Display only a particular piece of text, value, or graphic.
· Cause a command to be performed.
· Possess a contextual pop-up window.
Three extremely important principles regarding controls should be noted:
· A control must:
· Look the way it works. Work the way it looks.
· A control must be used exactly as its design intended.
· A control must be presented in a standard manner.
The look of a control should make it obvious that it is a control. Its design characteristics should signal “enterability” or “clickability.” Microsoft Windows, for example, presents the following simple rules:
· Raised elements can be pressed.
· Recessed elements cannot be pressed.
· Elements on a flat white background can be opened, edited, or moved.
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