how to change the mouse cursor that shows QLable is selectable

Qt Enthusiast

I am using setTextInteractionFlags (Qt::TextSelectableByMouse) for a the QLable . When I select the QLabel I can select the text and copy to clipboard . But when my mouse comes near to Qlabel it does not change the currsor that the QLabel is selectable .

How can I change the mouse cursor to show it user that QLable is selectable

joeQ

@Qt-Enthusiast Hi, friend, welcome.

Text is selectable is different with QLabel is selectable. They are two conpect.

You can reimplement mouseMoveEvent of QLabel, in function, you can changed some state of QLable when use move the mouse hover QLabel.

Note: setMouseTracking(true) for QLabel.

VRonin

Wouldn't it be better to use QLineEdit with setReadOnly(true)? selecting Labels is not expected behaviour (and I'm not talking just in Qt but in any application)

Qt Enthusiast

@joeQ

I have done following code

class myLabel: public QLabel
{

public:
myLabel(QString string)
{
this->setText(string);
this->setTextInteractionFlags (Qt::TextSelectableByMouse);

  //set MouseTracking true to capture mouse event even its key is not pressed
  this->setMouseTracking(true);
};
~ myLabel(){};

void mouseMoveEvent ( QMouseEvent * event )
{
      setCursor(Qt::IBeamCursor);
  //Show x and y coordinate values of mouse cursor here
  //this->setText("Select the text");
};

    void mouseReleaseEvent(QMouseEvent * event)
    {
      //setCursor(Qt::ArrowCursor);

    }

};

but I am still getting issue , I want when the mouse goes away from text of QLabel then The mouse cursor should change back to Arrow

mrjj

@Qt-Enthusiast
Hi you can use
virtual void leaveEvent(QEvent * event)
to reset cursor.

Qt Enthusiast

@mrjj
Here is following code

class myLabel: public QLabel
{

public:
myLabel(QString string)
{
this->setText(string);
this->setTextInteractionFlags (Qt::TextSelectableByMouse);

  //set MouseTracking true to capture mouse event even its key is not pressed
  this->setMouseTracking(true);
};
~ myLabel(){};

void enterEvent ( QEvent * event )
{
      setCursor(Qt::IBeamCursor);
      QLabel::enterEvent(event);
  //Show x and y coordinate values of mouse cursor here
  //this->setText("Select the text");
};

    void leaveEvent(QEvent * event)
    {
      setCursor(Qt::ArrowCursor);
      QLabel::leaveEvent(event);

    }

In this I am getting Qt::IBeamCursor on whole QLabel and I want the Qt::IBeamCursor should only on text of QLabel and then when I leave the text of I should get (Qt::ArrowCursor
but how can Qt::IBeamCursor only for text portion of QLabel not the whoe QLabel

mrjj

@Qt-Enthusiast
setCursor works on whole widget so unless u know where text is draw and only change when over the text it will change when over the whole label.
You could use http://doc.qt.io/qt-5/qfontmetrics.html
and
http://doc.qt.io/qt-5/qfontmetrics.html#boundingRect-1
to know the text area and store and only setCursor when inside that and reset when outside.
(use mousemove)

Since there is no signal for user finishing edit in a label as far as i know then you might get issues
knowing when u re-calculate the text rect.
But you could override paint and call QLabel::paint(xxx); at the top and then
store the text rect. That should work.

Qt Enthusiast

A small example could be helpful for me

mrjj

Hi
Text has to be top aligned but otherwise it works ok

#include<QLabel>
#include<QFontMetrics>

class myLabel: public QLabel {
  QRect textArea;
 public:
  myLabel(QString string) {
    this->setText(string);
    this->setTextInteractionFlags (Qt::TextSelectableByMouse);
    setAlignment(Qt::AlignLeading | Qt::AlignLeft | Qt::AlignTop); // WONT WORK IF CENTERED
    //set MouseTracking true to capture mouse event even its key is not pressed
    this->setMouseTracking(true);
  };
  ~ myLabel() {}

 protected:
  virtual void paintEvent(QPaintEvent* event) {
    QLabel::paintEvent(event); // call base class
    QFontMetrics fm(font()); // give it the font used
    auto r = fm.boundingRect(text()); // get the area of the text. 
    textArea.setCoords(0, 0, r.width(), r.height()); // set variable
    qDebug() << "text:" << textArea;
  }

  virtual void mouseMoveEvent(QMouseEvent* event)  {
    auto t = mapFromGlobal( QCursor::pos() ); // get mouse pos, translate to x,y usefull inside widget
    qDebug() << "MOUSEPOS:" << t << " area:" << textArea ;
    if ( textArea.contains( t ) ) // is the point inside the rect
    { setCursor(Qt::IBeamCursor); }
    else
    { setCursor(Qt::ArrowCursor); }
  }
};

Qt Enthusiast

I tried this I am noy able to select the text am I missing some thing

mrjj

@Qt-Enthusiast
I can only select by clicking word. Not by dragging.
Dont know why.