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java.lang.Object | +--javax.microedition.lcdui.Ticker
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
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.
Constructor Summary | |
Ticker(String str)
Constructs a new Ticker object, given its initial
contents string. |
Method Summary | |
String |
getString()
Gets the string currently being scrolled by the ticker. |
void |
setString(String str)
Sets the string to be displayed by this ticker. |
Methods inherited from class java.lang.Object |
equals, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait |
Constructor Detail |
public Ticker(String str)
Ticker
object, given its initial
contents string.str
- string to be set for the Ticker
NullPointerException
- if str
is null
Method Detail |
public void setString(String str)
str
- string to be set for the Ticker
NullPointerException
- if str
is null
getString()
public String getString()
setString(java.lang.String)
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