Qcombobox

[arturs]

#include "mycombobox.h"
 
MyCombobox::MyCombobox(QWidget *parent) : QComboBox(parent)
{
 
}
 
MyCombobox::~MyCombobox()
{
 
}

#include "mycombobox.h"

MyCombobox::MyCombobox(QWidget *parent) : QComboBox(parent)
{

}

MyCombobox::~MyCombobox()
{

}

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#ifndef MYCOMBOBOX_H
#define MYCOMBOBOX_H
 
#include <QObject>
#include <QWidget>
#include <QComboBox>
 
class MyCombobox : public QComboBox
{
    Q_OBJECT
public:
    MyCombobox(QWidget *parent = 0);
    ~MyCombobox();
};
 
#endif // MYCOMBOBOX_H

#ifndef MYCOMBOBOX_H
#define MYCOMBOBOX_H

#include <QObject>
#include <QWidget>
#include <QComboBox>

class MyCombobox : public QComboBox
{
    Q_OBJECT
public:
    MyCombobox(QWidget *parent = 0);
    ~MyCombobox();
};

#endif // MYCOMBOBOX_H

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The error is when I only use the above code without QMouseEvent etc

[stampede]

Code looks ok. Be sure to include 'mycombobox.h' in the HEADERS list in .pro file and re-run qmake.
Can you verify that "moc_mycombobox.cpp" file is created somewhere under the build directory ?

[arturs]

It was not moc_mycom....

I deleted all files from catalogue where are files moc* etc and rebuild project once again. Now Everything is ok.

Thank you for help

---

Added after 20 minutes:

Ok. It works after clicking is emited signal ... but I lost rest of action of QCombobox Only cliking works.

[wysota]

Ok. It works after clicking is emited signal ... but I lost rest of action of QCombobox Only cliking works.

Because you are not calling the base-class implementation of the event handler.

[arturs]

What Should I change in my code ?

[stampede]

Call the base-class implementation of the event handler No Qt magic here, just the standard C++ way to call the base-class implementation of virtual method in derived class.

[arturs]

My present code:

void MyComboBox::mousePressEvent(QMouseEvent *event)
{
 
 
 
    if (event->button()==Qt::LeftButton) emit clicked();
 
    else {
 
             QComboBox::mousePressEvent(event);
 
    }
}

void MyComboBox::mousePressEvent(QMouseEvent *event)
{



    if (event->button()==Qt::LeftButton) emit clicked();

    else {

             QComboBox::mousePressEvent(event);

    }
}

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In standard QCombobox implementation leftbutton of mouse expands a list, but now after clicking mouse is emited signal (it is clear) so I cannot expand the list.
something I do not understand but I do not know what. Where to call base -class.

My application is:

I have a qCombobox and there is list of available com ports. If a port is uninstalled or new installed I would like to refresh my com ports list automatically.

Maybe is better way to do it.

Regards
Artur

[wysota]

In standard QCombobox implementation leftbutton of mouse expands a list, but now after clicking mouse is emited signal (it is clear) so I cannot expand the list.
something I do not understand but I do not know what. Where to call base -class.

You need to develop some logic around your code. Your current code says "if left mouse button is clicked on the combobox, emit a clicked() signal, otherwise (not left mouse button is clicked) do whatever a regular combobox does". Your code doesn't say anything about the combo being empty or anything like that. The compiler does not browse the Internet while compiling your code and it will not encounter this thread and thus it will not know what you meant your code to do. You need to explicitly tell it what you want it to do by writing C++ code that implements the algorithm that solves your problem.

I have a qCombobox and there is list of available com ports. If a port is uninstalled or new installed I would like to refresh my com ports list automatically.

Maybe is better way to do it.

Surely there is Rebuild the list whenever you detect a set of available ports is modified.

[ChrisW67]

Rerun qmake after adding/removing the Q_OBJECT macro, then rebuild.

Err... Ignore me, I missed a whole set of replies.

[arturs]

You need to develop some logic around your code. Your current code says "if left mouse button is clicked on the combobox, emit a clicked() signal, otherwise (not left mouse button is clicked) do whatever a regular combobox does". Your code doesn't say anything about the combo being empty or anything like that. The compiler does not browse the Internet while compiling your code and it will not encounter this thread and thus it will not know what you meant your code to do. You need to explicitly tell it what you want it to do by writing C++ code that implements the algorithm that solves your problem.

I understand not possible to have to action using one button of mouse Now I use left button to expands the list of Combobox and right to refresh list of ports.

Surely there is Rebuild the list whenever you detect a set of available ports is modified.

Which is the best way. Unfortunately there is no signal which will inform me about it

[wysota]

I understand not possible to have to action using one button of mouse Now I use left button to expands the list of Combobox and right to refresh list of ports.

That's not what I meant.

Which is the best way. Unfortunately there is no signal which will inform me about it

I have no idea how you fetch the list of ports so I cannot suggest a way to refresh that list.

[arturs]

That's not what I meant..

It works After emiting signal receiver refresh list of ports and showlist so I can have many action for one button

Thank you for your help and for your patience.

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