| Implements a "ticker-tape", a piece of text that runs
continuously across the display. The direction and speed of scrolling are
determined by the implementation. While animating, the ticker string
scrolls continuously. That is, when the string finishes scrolling off the
display, the ticker starts over at the beginning of the string.
There is no API provided for starting and stopping the ticker. The
application model is that the ticker is always scrolling continuously.
However, the implementation is allowed to pause the scrolling for power
consumption purposes, for example, if the user doesn't interact with the
device for a certain period of time. The implementation should resume
scrolling the ticker when the user interacts with the device again.
The text of the ticker may contain
line breaks.
The complete text MUST be displayed in the ticker;
line break characters should not be displayed but may be used
as separators.
The same ticker may be shared by several Displayable
objects ("screens"). This can be accomplished by calling
Displayable.setTicker setTicker() on each of them.
Typical usage is for an application to place the same ticker on
all of its screens. When the application switches between two screens that
have the same ticker, a desirable effect is for the ticker to be displayed
at the same location on the display and to continue scrolling its contents
at the same position. This gives the illusion of the ticker being attached
to the display instead of to each screen.
An alternative usage model is for the application to use different
tickers on different sets of screens or even a different one on each
screen. The ticker is an attribute of the Displayable class
so that
applications may implement this model without having to update the ticker
to be displayed as the user switches among screens.
since:
MIDP 1.0 | 