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Multimedia viewers
For viewers that support several forms of data, the capabilities should be extended,
while still keeping the core functions consistent with text viewers. For example, the
viewed data may contain graphical still images that are displayed among text. The
following additions to the earlier rules are applied:
When necessary an embedded image shall be scaled down so that it can fit the
display as a whole. If the scaling capabilities are limited, a moderate amount of
oversize can be allowed.
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When scrolling the data, the user should be able to see each image completely.
This means that at least one scrolling step should let the user view the full
image. (If scrolling would occur strictly one screenful at a time, an image could
be split into two parts, each one in a separate screen.)
The user should able to view an embedded image better by opening it into an
image viewer. (Note that a focus may exist in order to select the desired image,
although application designs without focus are also possible.)
After viewing an image in a separate image viewer, the user shall be able to
come directly back to the multimedia viewer, in the position the user started
from.
Audio and video players
Audio and video are time-based data. The players for such data need at least the
following functions:
Play
Pause
Stops the player, but leaves the pointer in the current location so that playing
can be continued later.
These commands can be mapped to the same key, as only one of them is needed at
all times. These functions shall be accessible by a single key press. The positive action
softkey is preferred for this purpose.
Additional functions may include:
Stop
Ends playing the clip and positions the pointer in the beginning of the current
piece or section (audio or video clip).
Next piece
Moves to the beginning of the next piece.
Previous piece
Moves to the beginning of the previous piece.
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