Selecting an entire line from TextArea on mouse click - javafx

Question

I am using JavaFX for my application. In my application I have a button,on click on that button should display the results on textarea, that I am able to do. Now I would like to select the entire line on click from the text area. But The code which I have written is able to select only the value which I click which means like only word on which I have clicked. Please suggest me to modify this.
#FXML
public void find_btn_action(ActionEvent event) throws MWException
{
double[] peaks= {1.2,5.6,8.0,9.0};
StringBuilder sb = new StringBuilder(peaks.length);
for(int i= 0; i < peaks.length ; i++)
{
result[i] = peaks[i];
sb.append(result[i]+"\n");
}
auto.setText(sb.toString());
auto.setOnMouseClicked(new EventHandler<Event>()
{
#Override
public void handle(Event arg0)
{
selectedVal = auto.getSelectedText();
System.out.println("selected text:"+ selectedVal);
}
});
}

Answer 1

In your mouse click listener check, if the click was inside the content area and if this is the case, use the caret position to determine the next/previous line break in the TextArea's text and select this range:
textArea.setOnMouseClicked(evt -> {
if (evt.getButton() == MouseButton.PRIMARY) {
// check, if click was inside the content area
Node n = evt.getPickResult().getIntersectedNode();
while (n != textArea) {
if (n.getStyleClass().contains("content")) {
// find previous/next line break
int caretPosition = textArea.getCaretPosition();
String text = textArea.getText();
int lineBreak1 = text.lastIndexOf('\n', caretPosition - 1);
int lineBreak2 = text.indexOf('\n', caretPosition);
if (lineBreak2 < 0) {
// if no more line breaks are found, select to end of text
lineBreak2 = text.length();
}
textArea.selectRange(lineBreak1, lineBreak2);
evt.consume();
break;
}
n = n.getParent();
}
}
});