QlineEdit下拉列表设置及无文字时鼠标点击显示所有下拉数据

1.增加如下设置

completer->setCaseSensitivity(Qt::CaseInsensitive);
completer->setCompletionMode(QCompleter::UnfilteredPopupCompletion);
lineEdit->completer()->complete();

这是你如何做到的:

为你的lineedit定义textChanged插槽;
覆盖窗口的customEvent方法;
在textChanged插槽中将用户事件发送到窗口
lineedit的文字长度为零;
在customEvent方法中,只要收到用户事件,就会显示完成;

以下是一个例子:

mainwindow.h:

  1. class MainWindow : public QMainWindow

  2. {

  3. Q_OBJECT

  4. public:

  5. explicit MainWindow(QWidget *parent = 0);

  6. ~MainWindow();

  7. protected:

  8. void customEvent(QEvent * event);

  9. private:

  10. Ui::MainWindow *ui;

  11. private slots:

  12. void on_lineEdit_textChanged(QString );

  13. };

mainwindow.cpp:

  1. class CompleteEvent : public QEvent

  2. {

  3. public:

  4. CompleteEvent(QLineEdit *lineEdit) : QEvent(QEvent::User),m_lineEdit(lineEdit) { }

  5. void complete()

  6. {

  7. m_lineEdit->completer()->complete();

  8. }

  9. private:

  10. QLineEdit *m_lineEdit;

  11. };

  12. MainWindow::MainWindow(QWidget *parent) :

  13. QMainWindow(parent),ui(new Ui::MainWindow)

  14. {

  15. ui->setupUi(this);

  16. QStringList wordList;

  17. wordList << "one" << "two" << "three" << "four";

  18. QLineEdit *lineEdit = new QLineEdit(this);

  19. lineEdit->setGeometry(20,20,200,30);

  20. connect(lineEdit,SIGNAL(textChanged(QString)),SLOT(on_lineEdit_textChanged(QString )));

  21. QCompleter *completer = new QCompleter(wordList,this);

  22. completer->setCaseSensitivity(Qt::CaseInsensitive);

  23. completer->setCompletionMode(QCompleter::UnfilteredPopupCompletion);

  24. lineEdit->setCompleter(completer);

  25. }

  26. MainWindow::~MainWindow()

  27. {

  28. delete ui;

  29. }

  30. void MainWindow::customEvent(QEvent * event)

  31. {

  32. QMainWindow::customEvent(event);

  33. if (event->type()==QEvent::User)

  34. ((CompleteEvent*)event)->complete();

  35. }

  36. void MainWindow::on_lineEdit_textChanged(QString text)

  37. {

  38. if (text.length()==0)

  39. QApplication::postEvent(this,new CompleteEvent((QLineEdit*)sender()));

  40. }

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