public void actionPerformed(ActionEvent evt)
{
JEditTextArea textArea = getTextArea(evt);
int firstLine = textArea.getFirstLine();
int visibleLines = textArea.getVisibleLines();
int line = textArea.getCaretLine();
if(firstLine < visibleLines)
firstLine = visibleLines;
textArea.setFirstLine(firstLine - visibleLines);
int caret = textArea.getLineStartOffset(
Math.max(0,line - visibleLines));
if(select)
textArea.select(textArea.getMarkPosition(),caret);
else
textArea.setCaretPosition(caret);
}
public void actionPerformed(ActionEvent evt)
{
JEditTextArea textArea = getTextArea(evt);
int caret = textArea.getCaretPosition();
int lastOfLine = textArea.getLineEndOffset(
textArea.getCaretLine()) - 1;
int lastVisibleLine = textArea.getFirstLine()
+ textArea.getVisibleLines();
if(lastVisibleLine >= textArea.getLineCount())
{
lastVisibleLine = Math.min(textArea.getLineCount() - 1,
lastVisibleLine);
}
else
lastVisibleLine -= (textArea.getElectricScroll() + 1);
int lastVisible = textArea.getLineEndOffset(lastVisibleLine) - 1;
int lastDocument = textArea.getDocumentLength();
if(caret == lastDocument)
{
textArea.getToolkit().beep();
return;
}
else if(!Boolean.TRUE.equals(textArea.getClientProperty(
SMART_HOME_END_PROPERTY)))
caret = lastOfLine;
else if(caret == lastVisible)
caret = lastDocument;
else if(caret == lastOfLine)
caret = lastVisible;
else
caret = lastOfLine;
if(select)
textArea.select(textArea.getMarkPosition(),caret);
else
textArea.setCaretPosition(caret);
}
public void actionPerformed(ActionEvent evt)
{
JEditTextArea textArea = getTextArea(evt);
int lineCount = textArea.getLineCount();
int firstLine = textArea.getFirstLine();
int visibleLines = textArea.getVisibleLines();
int line = textArea.getCaretLine();
firstLine += visibleLines;
if(firstLine + visibleLines >= lineCount - 1)
firstLine = lineCount - visibleLines;
textArea.setFirstLine(firstLine);
int caret = textArea.getLineStartOffset(
Math.min(textArea.getLineCount() - 1,
line + visibleLines));
if(select)
textArea.select(textArea.getMarkPosition(),caret);
else
textArea.setCaretPosition(caret);
}