public PlainView(Document doc, JTextComponent component) {
super(doc);
this.comp = component;
// Subscribe to key presses so we know when to mark the document
// as updated
comp.addKeyListener(
new KeyAdapter() {
public void KeyTyped(KeyEvent e) {
updateModelFromComponent(comp.getText());
}
});
// Subscribe to Document events so we know when to update
// the component from the model.
doc.addDocumentListener(
new DocumentListener() {
public void insertUpdate(DocumentEvent e) {
updateComponentFromModel();
}
public void removeUpdate(DocumentEvent e) {
updateComponentFromModel();
}
public void changedUpdate(DocumentEvent e) {
updateComponentFromModel();
}
});
}
/** Reads the text from the model and replaces the text in the component. */
public void updateComponentFromModel() {
// We set this flag when a keypress fires a model
// change - this ensures that if the model was just
// updated from the component, the resulting Document
// change doesn't fire a component update (losing
// the caret position and looking weird to the user).
// Besides - if this flag is set, the two have just
// been synced so there's no need to do it again.
if (componentJustChanged) {
componentJustChanged = false;
return;
}
try {
comp.setText(doc.getText(0, doc.getLength()));
} catch (BadLocationException e) {
// Shouldn't ever happen
e.printStackTrace();
}
}