Java Reference
In-Depth Information
if
(clipData.isDataFlavorSupported(DataFlavor.stringFlavor))
{
String
text
=
(String)
clipData.getTransferData(DataFlavor.stringFlavor);
ta.replaceRange(text, ta.getSelectionStart(),
ta.getSelectionEnd());
}
}
catch (UnsupportedFlavorException ufe)
{
ta.setText("flavor not supported");
}
catch (IOException ioe)
{
ta.setText("no data to paste");
}
}
copy()
'sfirsttaskistoextracttheselectedtextfromthetextareabycalling
Tex-
tComponent
's
String getSelectedText()
method.Itthenpassesthistextto
the
StringSelection(String data)
constructortocreateatransferableobject
that contains this text.
Continuing,
copy()
passes this object to the clipboard by invoking
clip-
board.setContents(ss, ss)
. The same
StringSelection
object (
ss
) is
passedasthetransferableobjectandtheclipboardownerbecause
StringSelection
implements
Transferable
and
ClipboardOwner
.
cut()
is much simpler. This method first invokes
copy()
to copy the selected
texttotheclipboard.Ittheninvokes
TextArea
's
void replaceRange(String
str, int start, int end)
methodtoremovetheselectedtext(delimitedbythe
integer values returned from
TextComponent
's
int getSelectionStart()
and
int getSelectionEnd()
methods) by replacing it with the empty string.
paste()
isthemostcomplexofthethreemethods.Itfirstinvokes
Clipboard
's
Transferable getContents(Object requestor)
methodtoreturnatrans-
ferableobjectrepresentingthecurrentcontentsoftheclipboard(ornullwhentheclip-
boardisempty).The
requestor
parameteriscurrentlynotused;itmaybeimplemen-
ted in a future release of the
java.awt.datatransfer
package.
