CODEWITHSUNDEEP
qtqfiledialogqtwidgets
ereisch
ereisch

Reputation: 204

Tooltips (or other action) in QFileDialog

I want to have a Tooltip (or ideally, a QWidget) pop-up when hovering over a file in a QFileDialog::getOpenFileName instance.
Is there a way to do this without subclassing the class?

Upvotes: 0

Views: 221

Answers (1)

G.M.
G.M.

Reputation: 12899

I'm not sure there's any approved/definitive way of doing this. The following is a rather hacky way of achieving what (I think) you want but which makes certain assumptions regarding the widget hierarchy associated with a QFileDialog instance. Specifically, it relies on the assumption that the widget hierarchy subtended by a QFileDialog instance will contain one or more QAbstractItemView instances...

#include <iostream>
#include <QAbstractItemView>
#include <QApplication>
#include <QCursor>
#include <QFileDialog>
#include <QToolTip>

int
main (int argc, char **argv)
{
  QApplication app(argc, argv);
  QFileDialog fd;

  /*
   * Further to the comments by @Parisa.H.R, we need to make sure we use a
   * non-native file dialog here otherwise there's no way to get the desired
   * behaviour.
   */
  fd.setOption(QFileDialog::DontUseNativeDialog);

  /*
   * Search the widget hierarchy under the QFileDialog looking for instances of
   * QAbstractItemView or derived classes.
   */
  for (auto *v: fd.findChildren<QAbstractItemView *>()) {
    std::clog << "view = " << v << "(type=" << v->metaObject()->className()
              << ", name=\"" << v->objectName().toStdString() << "\")\n";

    /*
     * Connect the view's entered signal to a lambda which, for the time being,
     * simply displays a tooltip showing the name of the filesystem item.
     */
    QObject::connect(v, &QAbstractItemView::entered,
                     [](const QModelIndex &index)
                       {
                         QToolTip::showText(QCursor::pos(), index.data(Qt::DisplayRole).toString());
                       });

    /*
     * In order to receive the QAbstractItemView::entered signal mouse tracking
     * must be enabled for the view.
     */
    v->setMouseTracking(true);
  }
  fd.exec();
}

Upvotes: 3

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