private boolean checkForSave() {
// build warning message
String message;
if (file == null) {
message = "File has been modified. Save changes?";
} else {
message = "File \"" + file.getName() + "\" has been modified. Save changes?";
}
// show confirm dialog
int r =
JOptionPane.showConfirmDialog(
this,
new JLabel(message),
"Warning!",
JOptionPane.YES_NO_CANCEL_OPTION,
JOptionPane.WARNING_MESSAGE);
if (r == JOptionPane.YES_OPTION) {
// Save File
if (fileChooser.showSaveDialog(this) == JFileChooser.APPROVE_OPTION) {
// write the file
physWriteTextFile(fileChooser.getSelectedFile(), textView.getText());
} else {
// user cancelled save after all
return false;
}
}
return r != JOptionPane.CANCEL_OPTION;
}
public void exit() {
// user is attempting to exit the interpreter.
// make sure this is what they want to do
// and check if changes need to be saved.
int r =
JOptionPane.showConfirmDialog(
this,
new JLabel("Exit Interpreter?"),
"Confirm Exit",
JOptionPane.YES_NO_OPTION,
JOptionPane.QUESTION_MESSAGE);
if (r == JOptionPane.YES_OPTION) {
// user still wants to go ahead.
// if file not saved then prompt to check
// whether it should be.
if (!dirty || checkForSave()) {
System.exit(0);
}
}
}
private void showErrorDialog(String msg) {
// show a dialog window containing the error message
JOptionPane.showMessageDialog(this, new JLabel(msg), "Error!", JOptionPane.ERROR_MESSAGE);
}