QTableWidget 中的 Qt MouseTracking

Question

我想使用 Qt4.7 在 QTableWidget 中启用 mouseTracking。通常这应该直接使用 setMouseTracking(true)。这适用于其他小部件，但 QTableWidget 抵制它。为了激活 mouseTracking，我需要处理什么特别的事情吗？

虽然我实际上正在做更复杂的事情，但我可以确信它没有通过在 mouseMoveEvent 中打印出 QMouseEvent.x() 来启用。到目前为止谢谢:)

这是我尝试过的:

    QGridLayout * layout = new QGridLayout(this);
    SCTableWidget * aTable = new SCTableWidget(tableRows, tableCols, this);

    QTableWidgetItem * newItem;
    for(int i = 0; i<(3); i++) {
        for(int j = 0; j<(17); j++) {
            newItem = new QTableWidgetItem(QString::number(tableData[i][j]));
            aTable->setItem(i,j, newItem);
        }
    }

// First try
    aTable->setMouseTracking(true);

//Second try. Main Window further down.
    MainWindow::instance->enableMouseTracking(aTable->children());
    MainWindow::instance->enableMouseTracking(aTable->viewport()->children());


// Third try
    aTable->viewport()->setMouseTracking(true);

    layout->addWidget(aTable, 0, 0, 1, 2);

第二次尝试包含一个在 MainWindow 中实现的方法，如下所示:

void
MainWindow::enableMouseTracking(const QObjectList & pChildren)
{
  foreach(QObject * obj, pChildren)
  {
    QWidget * w = qobject_cast<QWidget *>(obj);

    if(w)
    {
      w->setMouseTracking(true);
      enableMouseTracking(w->children());
    }
  }
}

Answer 1

为 QTableWidget->viewport() 打开鼠标跟踪通常是有效的。您是否也在为 QTableWidget->viewport() 小部件捕获鼠标事件？请检查以下示例是否适合您:

测试.h:

class MainWindow : public QMainWindow
{
    Q_OBJECT

public:
    explicit MainWindow(QWidget *parent = 0);
    ~MainWindow();

    bool eventFilter(QObject *obj, QEvent *event);

private:
    Ui::MainWindow *ui;
    QTableWidget *table;
};

测试.cpp:

MainWindow::MainWindow(QWidget *parent) : QMainWindow(parent),
    ui(new Ui::MainWindow)
{
    ui->setupUi(this);

    table = new QTableWidget(5, 10, this);
    table->setGeometry(10, 20, 300, 200);

    for (int row=0; row<5; ++row)
        for (int column=0; column<10; ++column)
            table->setItem(row, column, new QTableWidgetItem(tr("%1").arg((row+1)*(column+1))));

    table->setMouseTracking(true);
    table->viewport()->setMouseTracking(true);
    table->installEventFilter(this);
    table->viewport()->installEventFilter(this);
}

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

bool MainWindow::eventFilter(QObject *obj, QEvent *event)
{
    if (obj == table)
    {
        if (event->type() == QEvent::MouseButtonPress)
            qDebug() << "table mouse press event";
        else if (event->type() == QEvent::MouseMove)
            qDebug() << "table mouse moveevent";
    }
    else if (obj == table->viewport())
    {
        if (event->type() == QEvent::MouseButtonPress)
            qDebug() << "table->viewport mouse press event";
        else if (event->type() == QEvent::MouseMove)
            qDebug() << "table->viewport mouse moveevent";
    }
    return QMainWindow::eventFilter(obj, event);
}

希望这对你有帮助，问候