[solved]Qt 4.8 signalMapper doesn't work
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Thank you for your reply. But this code was not actually mine, I just copied Example code from QT website and just changed from string to int.
This is mine below.
mySlot method is to test if signalMapper is sending a right id value. But nothing happens with buttons clicked.
@vector<QPushButton *> button;
QSignalMapper *signalMapper;signalMapper = new QSignalMapper(this);
for (int i = 0; i<10; i++)
{
button.push_back(newQPushButton("myButton");
QObject::connect(button[i], SIGNAL(clicked()), signalMapper, SLOT(map()));
signalMapper->setMapping(button[i], i);
}QObject::connect(signalMapper, SIGNAL(mapped(int)), this, SLOT(mySlot(int)));
void class::mySlot(int position)
{
QMessageBox msgBox;
msgBox.setText(QString("Button #: %1").arg(position));
msgBox.exec();
}@ -
Hope you are clicking on the button. Just try with following and see how things work. Based on this you can modify your example. In your example, I did not see where the buttons are shown and where the clicked signal is coming. Just running the program nothing happens.
@QPushButton *button = new QPushButton("Pthinks");
signalMapper->setMapping(button, 1);
button.show();
QObject::connect(button[i], SIGNAL(clicked()), signalMapper, SLOT(map()));QObject::connect(signalMapper, SIGNAL(mapped(int)), this, SLOT(mySlot(int)));
void class::mySlot(int position)
{
QMessageBox msgBox;
msgBox.setText(QString("Button #: %1").arg(position));
msgBox.exec();
}@ -
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yes, I have taken few things from your code and modified slightly. See the following code. Just try with simple one first and see how it works.
@QPushButton *button = new QPushButton("Pthinks");
signalMapper->setMapping(button, 1);
button.show();
QObject::connect(button, SIGNAL(clicked()), signalMapper, SLOT(map()));QObject::connect(signalMapper, SIGNAL(mapped(int)), this, SLOT(mySlot(int)));
void class::mySlot(int position)
{
QMessageBox msgBox;
msgBox.setText(QString("Button #: %1").arg(position));
msgBox.exec();
}@ -
I have already tried with another method with a single slot not using signalMapper. And it works fine. What I did is to use mySlot_test function
@
void class::mySlot_test()
{
QMessageBox msgBox;
msgBox.setText(QString("Button clicked");
msgBox.exec();
}QObject::connect(button[i], SIGNAL(clicked()), this, SLOT(mySlot_test()));
@When I clicked every single button, this function is called and works fine.
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Looks like you are missing something. Here is the complete code. Just try this. Make program like the following. It will work.
@===main.cpp=====
#include "widget.h"
#include <QApplication>int main(int argc, char *argv[])
{
QApplication a(argc, argv);
Widget w;
w.show();return a.exec();}
====widget.h=====
#ifndef WIDGET_H
#define WIDGET_H#include <QWidget>
#include <QMessageBox>
class Widget : public QWidget
{
Q_OBJECTpublic:
Widget(QWidget *parent = 0);
~Widget();
public slots:
void myslot(int);
};
===widget.cpp====#include "widget.h"
#include <QPushButton>
#include <QSignalMapper>
Widget::Widget(QWidget *parent)
: QWidget(parent)
{
QSignalMapper *signalMapper = new QSignalMapper;
QPushButton *button = new QPushButton("Pthinks");
signalMapper->setMapping(button, 1);
button->show();
connect(button, SIGNAL(clicked()), signalMapper, SLOT(map()));
connect(signalMapper, SIGNAL(mapped(int)), this, SLOT(myslot(int)));}
void Widget::myslot(int position)
{
QMessageBox msgBox;
msgBox.setText(QString("Button #: %1").arg(position));
msgBox.exec();;
}Widget::~Widget()
{}
@ -
I have been trying to figure out this problem for more than a day... Thank you for providing simple code. But my program is a bit huge and mixed (more than 16,000 lines). I am using Visual Studio 2010 with osg library. And I am using Qt for GUI.
@
QsignalMapper *signalMapper = new QSignalMapper;
QPushButton *buttonTest = new QPushButton("Test");
signalMapper->setMapping(buttonTest, 1);
gridLayout>addWidget(buttonTest, 0, 0, 1, 1);QObject::connect(buttonTest, SIGNAL(clicked()), signalMapper, SLOT(QSignalMapper::map()));
signalMapper->setMapping(buttonTest, 1);// Check if signalMapper works ->* this doesn't work
QObject::connect(signalMapper, SIGNAL(QSignalMapper::mapped(int)), this, SLOT(mySlot(int)));
*
// Check if button clicked -> this works fine
QObject::connect(buttonTest, SIGNAL(clicked()), this, SLOT(mySlot_Test()));void Widget::mySlot(int position)
{
QMessageBox msgBox;
msgBox.setText(QString("Button #%1").arg(position));
msgBox.exec();
}void Widget::mySlot_Test()
{
QMessageBox msgBox;
msgBox.setText(QString("Button Clicked"));
msgBox.exec();
}
@mySlot method is not called through signalMapper but mySlot_Test which can confirm if the button is clicked works. The button is showing without any problems. The message of "Button Clicked" pops up, but "Button #1" message windows never comes up. If mySlot_Test function goes can receive signal. There is nothing wrong with the other part of my code, such as deceleration of header file etc...
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Hi,
@QObject::connect(signalMapper, SIGNAL(QSignalMapper::mapped(int)), this, SLOT(mySlot(int)));@
is wrong, it should be
@QObject::connect(signalMapper, SIGNAL(mapped(int)), this, SLOT(mySlot(int)));@
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For connections to work with the old syntax, connect expects only the signal/slot signatures, no class name, no variable name etc.
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LoL... That did a trick... I do really appreciate your help!
Originally, I was avoiding calling osgEarth::map() for the connector. I had same methods (map() and mapped()). This is something I need to be aware of when I implement these SIGNAL-SLOT.
Thanks again! Problem Solved.
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You're welcome !
Since you have your mapper running, please update the thread title prepending [solved] so other forum users may know a solution has been found :)
