CODEWITHSUNDEEP
c++qtinputmenudrop-down-menu
Ivan Akulov
Ivan Akulov

Reputation: 4323

Is there any standard way to create drop-down menu from QLineEdit without QCompleter?

Is there any standard way to create drop-down menu from QLineEdit without QCompleter? For example, using QMenu or creating own class. Or there are any other existing widgets?

Or maybe I should use QAbstractItemModel for QCompleter? I've thought about it, but I don't really understand this QAbstractItemModel. If you have experience about creating menu in this way, please also help me.

So I need a common type of drop-down menu: menu with lines, everyone of which includes icon (QPixmap) and text (QLabel) in itself. It's like in Opera or Chrome browser in address input line, like the right part of Apple Spotlight etc.

Upvotes: 5

Views: 4138

Answers (2)

alexisdm
alexisdm

Reputation: 29896

From what you describe, you could try an editable QComboBox: It has its own model and view, its own completer, and can display icons.

QComboBox *comboBox = new QComboBox;
...
comboBox->setEditable(true);
// The completer popup isn't enabled by default
comboBox->completer()->setCompletionMode(QCompleter::PopupCompletion);

And since that QCompleter can display icons, I guess you can use a regular QLineEdit with a QCompleter and a model with icons. For the model, you can use a QStandardItemModel.

Upvotes: 2

Pavel Strakhov
Pavel Strakhov

Reputation: 40512

It's not possible with QMenu because it catch focus when showed and hides when loses focus. However, it's possible to use QListWidget (or any other regular widget) for this. I developed some working example for the proof of concept. It's default Qt Widget project with QMainWindow as main window. You need to add QLineEdit with name "lineEdit" into it and create slot for textChanged signa. Here's the code:

MainWindow.h:

class MainWindow : public QMainWindow {
  Q_OBJECT  
public:
  explicit MainWindow(QWidget *parent = 0);
  ~MainWindow();  
private slots:
  void on_lineEdit_textChanged(const QString &arg1);
private:
  Ui::MainWindow *ui;
  QListWidget* list;
};

MainWindow.cpp:

#include "MainWindow.h"
#include "ui_MainWindow.h"
#include <QDebug>

MainWindow::MainWindow(QWidget *parent) :
  QMainWindow(parent),
  ui(new Ui::MainWindow),
  list(new QListWidget)
{
  ui->setupUi(this);
  list->setWindowFlags(Qt::WindowFlags(
    Qt::FramelessWindowHint | Qt::WindowStaysOnTopHint));
  list->setAttribute(Qt::WA_ShowWithoutActivating);
}

MainWindow::~MainWindow() {
  delete list;
  delete ui;
}

void MainWindow::on_lineEdit_textChanged(const QString &arg1) {
  if (ui->lineEdit->text().isEmpty()) {
    list->hide();
    return;
  }
  list->clear();
  list->addItem(ui->lineEdit->text());
  list->addItem(tr("Google: ") + ui->lineEdit->text());
  list->move(ui->lineEdit->mapToGlobal(QPoint(0, ui->lineEdit->height())));
  if (!list->isVisible()) list->show();
}

There are several problems: you should hide menu when line edit loses focus or user move window, you can't set focus on the menu using down arrow button from line edit, etc. But I believe all these issues can be solved easily.

Upvotes: 2

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