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Knob Buttons are individual areas in the display that you can select. Invokes a specific action. Why are these areas called buttons? It was intentionally created to resemble a push button in the control panel.
When the button is “pressed”, the command is called. Its meaning is usually expressed as a Text label or small icon. Radio buttons You can also use the button to switch between the two states and display status information such as: Whether the current font is italic in a word processor or if an option is selected in a Web form.
CS504 SHORT NOTES
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These toggle buttons can be grouped so that the user can select one. Functions are a set of mutually exclusive options, such as the size of the current point. Font style.
These are called radio buttons. check box A set of options that are not mutually exclusive, such as font properties such as bold and italic. Underlined, a series of toggle buttons can be used to indicate an on/off state. options.
CS504 SHORT NOTES
A collection of such buttons is called a checkbox. toolbar Many systems have a small collection of buttons, each with an icon. Provides frequently used functions.
This toolbar has the following features: It is similar to a menu bar but has more functionality because the icons are smaller than their text. They can be displayed at the same time.
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Sometimes the toolbar content is fixed, but often Users can customize it by modifying or selecting the available functional areas.
Toolbar displayed among various predefined toolbars palettes In many applications, a control can be in one of several modes. The defining characteristic of modes is that the interpretation of actions, such as keystrokes or gestures with the mouse, changes as the mode change.
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For example, using the standard UNIX text editor vi, keystrokes can be interpreted either as operations to insert characters in the document or as operations to perform file manipulation.
Problems occur if the user is not aware of the current model. Palettes are a mechanism for making the set of possible modes and the active mode visible to the user.
A palette is usually a collection of icons that are reminiscent of the purpose of the various modes. An example is a drawing package would be a collection of icons to indicate the pixel color or pattern that is used to fill in objects, much like an artist’s palette for paint.
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Some systems allow the user to create palettes from menus or toolbars. In the case of pull-down menus, the user may be able ‘tear off’ the menu, turning it into a palette showing the menu items.
In the case of toolbars, he may be able to drag the toolbar away from its normal position and place it anywhere on the screen. Tear-off menus are usually those that are heavily graphical anyway, for example, line style of color selection in a drawing package.