Figure 6-9. Volume indicator in the Navi pane.
Viewers and players
Viewers are used for displaying
To edit or create new data, the user starts an editor; the viewer may offer an option for starting an editor.
When a piece of
Text viewers
Text viewers should in general follow these guidelines:
Text is wrapped according to the width of the viewing pane. There should be no need to scroll sideways while reading the text.
Up and down scrolling should proceed page by page. A press of scroll down key displays the next screenful of text. (Note that in editors, text is scrolled line by line.)
Image viewers
A still image viewer is a tool optimized for viewing photographs or other images. A dedicated image viewer may offer features like zooming and scrolling, full screen viewing, and adjustments of image parameters like brightness and contrast.
By default, the image should initially be scaled so that it fills the available screen area.
Viewing functions are available in the viewer’s menu of options. However, the numeric keypad may also be used to control some of the functions – this allows quick access to frequently used functions, such as zooming.
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