How to show ToolTip for QLineEdit with out mousehovering ..!

mounipanditi

I am trying to show the tooltip for a LineEdit without the mousehovering and by reading some examples and answers in Internet i have tried an example to make it work. But the example is compiling and executing fine but i am unable to achieve my target.

I know i did some thing wrong, i request your help to do so. Please correct bugs in my code.

MyLineEdit.h

#ifndef LINEEDITTOOLTIP_H
#define LINEEDITTOOLTIP_H

#include <QWidget>
#include <QLineEdit>

class MyLineEdit : public QLineEdit
{
  Q_OBJECT

public:
  MyLineEdit(QWidget *parent = 0);
  ~MyLineEdit();

signals:
  void focussed(bool hasFocus);

protected:
  virtual void focusInEvent(QFocusEvent *e);
  virtual void focusOutEvent(QFocusEvent *e);
};

#endif // LINEEDITTOOLTIP_H

MyLineEdit.cpp

#include "MyLineEdit.h"


MyLineEdit::MyLineEdit(QWidget *parent)
 : QLineEdit(parent)
{}

MyLineEdit::~MyLineEdit()
{}

void MyLineEdit::focusInEvent(QFocusEvent *e)
{
  QLineEdit::focusInEvent(e);
  emit(focussed(true));
}

void MyLineEdit::focusOutEvent(QFocusEvent *e)
{
  QLineEdit::focusOutEvent(e);
  emit(focussed(false));
}

Widget.h

#include <QWidget>
#include <QLineEdit>
#include <QPushButton>
#include <QDebug>
#include <QToolTip>
#include "MyLineEdit.h"

class Widget : public QWidget
{
    Q_OBJECT
    
public:
    /*!
     * This is Constructor
     */
    explicit Widget(QWidget *parent = 0);
    MyLineEdit *ledt;

    ~Widget();
private:
    QPushButton *button;
    QLineEdit *cmConfLineEdit;

private slots:
void showLineEditToolTip(bool);
void buttonSlot();
};
#endif

Widget.cpp

Widget::Widget(QWidget *parent) :
    QWidget(parent),
{
    ledt = new MyLineEdit;
   
    button = new QPushButton(this);
    button->setText("Press");
    button->setGeometry(100,50,40,40);

    cmConfLineEdit = new QLineEdit;
    cmConfLineEdit->setParent(ledt);
    cmConfLineEdit->setGeometry(100,120,60,30);

    connect(button,SIGNAL(clicked()),this,SLOT(buttonSlot()));
    connect(ledt,SIGNAL(focussed(bool)),this,SLOT(showLineEditToolTip(bool)));

void Widget::buttonSlot()
{
    cmConfLineEdit->setFocusPolicy(Qt::StrongFocus);
} 
void Widget::showLineEditToolTip(bool value)
{
    qDebug()<<"Bool Value is"<<value;
    if(value ==  true)
    {
        QToolTip::showText(QPoint(110,130),"Enter Conf Number",this);
    }
}

Thanks in Advance,
Mounika.P

raven-worx

@mounipanditi said in How to show ToolTip for QLineEdit with out mousehovering ..!:
are you sure it is not working?
QToolTip::showText() expects the position to be in global coordinates on the screen. Maybe you are just overseeing the tooltip?

mounipanditi

@raven-worx

Thanks for the reply,

I am sure after clicking on the PushButton i am unable to see the qDebug which i have written in the showLineEditToolTip SLOT.

What i have written is it correct..?

raven-worx

@mounipanditi said in How to show ToolTip for QLineEdit with out mousehovering ..!:

What i have written is it correct..?

seems so yes.
Any other output on the console regarding an unsuccessful connection to the slot?

mounipanditi

@raven-worx

Nope except the following statement on console i am unable to see anything

Qt: Session management error: None of the authentication protocols specified are supported

J.Hilk

@mounipanditi
I don't think what you've written is correct.

Let me see, you have a subclass of QLineEdit that has a custom focussed signal,
that seems ok.

You create such a custom object:

ledt = new MyLineEdit;
//and connect to it
connect(ledt,SIGNAL(focussed(bool)),this,SLOT(showLineEditToolTip(bool)));

also ok,
but your buttonSlot connects to this one:

void Widget::buttonSlot()
{
    cmConfLineEdit->setFocusPolicy(Qt::StrongFocus);
}

which is a normal QLineEdit so you of course won't get Signal from ledt

in fact your ledt is doing nothing, but leaking memory x)

raven-worx

@mounipanditi
what @J.Hilk wrote is only partially correct, but it lead me to the actual issue.
The code so far is syntactically correct. Though there is also non-sense contained.

it doesn't make sense to set a focus policy in a slot connected to a button. What should actually happen in this slot? If you want to set the focus to the line edit you should use setFocus() instead
I have no idea why you place a QLineEdit into your custom MyLineEdit widget. Thus the MyLineEdit widget never receives the focus, because the child (plain QLineEdit gets it first)

J.Hilk

@raven-worx
you're right, it seemes, that I missed the cmConfLineEdit->setParent(ledt); part. Only noticed it, when you wrote it down!

mounipanditi

@raven-worx said in How to show ToolTip for QLineEdit with out mousehovering ..!:

policy in a slot connected to a butto

I understand your point, can you please guide me how to achieve my target to show the ToolTip for a lineEdit with out mouse hovering either by a code snippet or a documented guide.

J.Hilk

@mounipanditi

your example modified:

Widget::Widget(QWidget *parent) :
    QWidget(parent),
{
    ledt = new MyLineEdit;
    ledt->setGeometry(100,120,60,30);
   
    button = new QPushButton(this);
    button->setText("Press");
    button->setGeometry(100,50,40,40);

    connect(button,SIGNAL(clicked()),this,SLOT(buttonSlot()));
    connect(ledt,SIGNAL(focussed(bool)),this,SLOT(showLineEditToolTip(bool)));

void Widget::buttonSlot()
{
    ledt->setFocus();
}

mounipanditi

@J.Hilk

Thanks for the reply i was unable to see the Tooltip after modifying the code as you have posted.

Please go through the below screen shots

https://unsee.cc/dunepima/