public class NullWindowProvider extends Object implements WindowProvider
Constructor and Description |
---|
NullWindowProvider() |
Modifier and Type | Method and Description |
---|---|
void |
addWindowProviderListener(WindowProviderListener listener)
Adds a new listener to this provider.
|
boolean |
isShowing()
Tells whether this
WindowProvider represents a window that is visible. |
void |
removeWindowProviderListener(WindowProviderListener listener)
Removes a listener from this provider
|
Window |
searchWindow()
Tries to find a window.
|
public void addWindowProviderListener(WindowProviderListener listener)
WindowProvider
addWindowProviderListener
in interface WindowProvider
listener
- the new listenerpublic void removeWindowProviderListener(WindowProviderListener listener)
WindowProvider
removeWindowProviderListener
in interface WindowProvider
listener
- the listener to removepublic Window searchWindow()
WindowProvider
Frame
or a Dialog
, and a plain Window
only as last resort.
If possible the main-frame or another important window that will not
be closed soon should be returned. Visible windows are preferred over
non visible ones. This method is not guaranteed to have success,
null
is a valid result. This method is not required
to return always the same window, however the WindowProviderListener
s
should be informed when the result changes.searchWindow
in interface WindowProvider
Frame
which won't be closed in
the near future, any window which does not fulfill the requirements
or null
if no window is available at all.public boolean isShowing()
WindowProvider
WindowProvider
represents a window that is visible. Under
normal circumstances this method would return:Window window = sarchWindow();
return window == null ? false : window.isShowing();
isShowing
in interface WindowProvider