在qt中获取标签的鼠标点击位置

发布于 2024-10-06 03:02:25 字数 750 浏览 3 评论 0原文

我用谷歌搜索了一下，发现这个论坛帖子，其中OP似乎遇到了我遇到的确切问题。问题是，我如何继承 QLabel 并重新实现 mousepressed 事件？我猜它会是这样的：

class CustomLabel : public QLabel
{
public:
    //what about the constructors?
    void mousePressEvent ( QMouseEvent * ev );
}

void CustomLabel::mousePressEvent ( QMouseEvent * ev )
{
    QPoint = ev->pos();
    //I want to have another function get the event position.
    //How would I achieve this? It's void!
    //Is there perhaps some way to set up a signal and slot with the position?
}

在我成功创建一个 CustomLabel 类之后，我如何才能将它放入设计视图中？

原文

I googled around and found this forum thread in which the OP seems to have had the exact problem I am having. The question is, how would I inherit from QLabel and reimplement the mousepressed event? I'm guessing it would be something like this:

class CustomLabel : public QLabel
{
public:
    //what about the constructors?
    void mousePressEvent ( QMouseEvent * ev );
}

void CustomLabel::mousePressEvent ( QMouseEvent * ev )
{
    QPoint = ev->pos();
    //I want to have another function get the event position.
    //How would I achieve this? It's void!
    //Is there perhaps some way to set up a signal and slot with the position?
}

And after I have successfully created a CustomLabel class, how would I be able to put it in design view?

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长安忆 2024-10-13 03:02:25

是的，您可以在 CustomLabel 类上设置信号，并让覆盖版本的 mousePressEvent 发出该信号。即

class CustomLabel : public QLabel
{
Q_OBJECT
signals:
    void mousePressed( const QPoint& );

public:
    CustomLabel( QWidget* parent = 0, Qt::WindowFlags f = 0 );
    CustomLabel( const QString& text, QWidget* parent = 0, Qt::WindowFlags f = 0 );

    void mousePressEvent( QMouseEvent* ev );
};

void CustomLabel::mousePressEvent( QMouseEvent* ev )
{
    const QPoint p = ev->pos();
    emit mousePressed( p );
}

CustomLabel::CustomLabel( QWidget * parent, Qt::WindowFlags f )
    : QLabel( parent, f ) {}

CustomLabel::CustomLabel( const QString& text, QWidget* parent, Qt::WindowFlags f )
    : QLabel( text, parent, f ) {}

构造函数只是模仿基本 QLabel 的构造函数，因此只需将它们的参数直接传递给相应的基本构造函数。

Yes, you can set up a signal on your CustomLabel class and have your overridden version of mousePressEvent emit it. i.e.

class CustomLabel : public QLabel
{
Q_OBJECT
signals:
    void mousePressed( const QPoint& );

public:
    CustomLabel( QWidget* parent = 0, Qt::WindowFlags f = 0 );
    CustomLabel( const QString& text, QWidget* parent = 0, Qt::WindowFlags f = 0 );

    void mousePressEvent( QMouseEvent* ev );
};

void CustomLabel::mousePressEvent( QMouseEvent* ev )
{
    const QPoint p = ev->pos();
    emit mousePressed( p );
}

CustomLabel::CustomLabel( QWidget * parent, Qt::WindowFlags f )
    : QLabel( parent, f ) {}

CustomLabel::CustomLabel( const QString& text, QWidget* parent, Qt::WindowFlags f )
    : QLabel( text, parent, f ) {}

The constructors just mimic those of the base QLabel and therefore simply pass their arguments straight on to the corresponding base constructors.

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无尽的现实 2024-10-13 03:02:25

就像这样:D

void CustomLabel::mousePressEvent(QMouseEvent *ev) 
{
QString x = QString::number(ev->x());
QString y = QString::number(ev->y());
qDebug() << x << "," << y;
}

just like this :D

void CustomLabel::mousePressEvent(QMouseEvent *ev) 
{
QString x = QString::number(ev->x());
QString y = QString::number(ev->y());
qDebug() << x << "," << y;
}

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