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Thread: selectAll in QLineEdit does not work

  1. #1
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    Default selectAll in QLineEdit does not work

    I have subclassed QLineEdit in order to handle a focus event, and I would like all existing text to be highlighted as soon as I click in the textbox. The selectAll() method does not work. What am I missing?

    Qt Code:
    1. // --------------------------------------------------------------------
    2. class MyLineEdit : public QLineEdit
    3. {
    4. Q_OBJECT
    5.  
    6. protected:
    7. void focusInEvent(QFocusEvent *);
    8.  
    9. };
    10.  
    11. void MyLineEdit::focusInEvent(QFocusEvent *e) {
    12.  
    13. this->selectAll(); // THIS DOESN'T WORK
    14. //this->clear(); // <-- THIS WORKS!
    15.  
    16. }
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  2. #2
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    Default Re: selectAll in QLineEdit does not work

    It most likely is working. What your getting is that you are selecting all the text, and then click a character in the box with your mouse, and so clearing the selection. Try it yourself - select all the text and then click in the box with your mouse.

    One solution would be to wait until the mouse button is released before doing the selectAll. Another would be to use a timer.

  3. #3
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    Default Re: selectAll in QLineEdit does not work

    Hmm, I didn't quite understand your answer. I must be missing something. Here's a complete example. I would like the text to be highlighted as soon as I click in the textbox.

    Qt Code:
    1. #ifndef MYLINEEDIT_H
    2. #define MYLINEEDIT_H
    3.  
    4. #include <QtGui>
    5.  
    6. class MyLineEdit : public QLineEdit
    7. {
    8. Q_OBJECT
    9.  
    10. protected:
    11. void focusInEvent(QFocusEvent *);
    12. };
    13.  
    14. #endif // MYLINEEDIT_H
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    Qt Code:
    1. #include "mylineedit.h"
    2.  
    3. void MyLineEdit::focusInEvent(QFocusEvent *) {
    4. //this->clear();
    5. this->selectAll();
    6. }
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    Qt Code:
    1. #include "mylineedit.h"
    2. #include <QtGui>
    3.  
    4. int main(int argc, char *argv[])
    5. {
    6. QApplication app(argc, argv);
    7. QFrame *f = new QFrame();
    8. MyLineEdit *tmp = new MyLineEdit();
    9. tmp->setText("test this");
    10. QHBoxLayout *flayout = new QHBoxLayout(f);
    11. flayout->addWidget(tmp);
    12. f->setFocus();
    13. f->show();
    14. return app.exec();
    15. }
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  4. #4
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    Default Re: selectAll in QLineEdit does not work

    I would surely call the base class implementation of the event handler as it does some useful things.

    Qt Code:
    1. void MyLineEdit::focusInEvent(QFocusEvent *e) {
    2. QLineEdit::focusInEvent(e);
    3. this->selectAll();
    4. }
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    If you want to select contents of the line edit upon receiving focus (and focusInEvent doesn't work, remember about the base class implementation call!) then connect QApplication::focusChanged() signal to a custom slot, check if the widget receiving the focus is your line edit and call selectAll() on it.
    Your biological and technological distinctiveness will be added to our own. Resistance is futile.

    Please ask Qt related questions on the forum and not using private messages or visitor messages.


  5. #5
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    Default Re: selectAll in QLineEdit does not work

    Hi, in case someone comes across this thread, this solution worked for me:

    Qt Code:
    1. void MyCustomSpinBox::focusInEvent(QFocusEvent *event)
    2. {
    3. QTimer::singleShot(0, [this](){
    4. selectAll();
    5. });
    6. }
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  6. The following user says thank you to Michal Fapso for this useful post:

    Kryzon (30th September 2015)

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