QTreeWidget signals and slots not being triggered

salunkerahul

I'm trying to make use of the QTreeWidget as follows and slots associated with the code below are not called and the return-value for connect(method) is zero. Could readers help me understand my mistakes?

Header File
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#include <QMainWindow>
#include <QModelIndex>
#include <QTreeWidget>

class test:public QMainWindow
{
Q_OBJECT

public:
test(QWidget* parent = 0)
{
treeWidget = new QTreeWidget(0);
treeWidget->setWindowModality(Qt::ApplicationModal);
treeWidget->setWindowTitle("Select Well/Logs");
treeWidget->setSelectionMode(QAbstractItemView::NoSelection); //QAbstractItemView::MultiSelection
QStringList headerLabels;
headerLabels << "Field" << "Inline" << "CrossLine";

  treeWidget->setColumnCount(headerLabels.size());
  treeWidget->setHeaderLabels(headerLabels);
  treeWidget->setAllColumnsShowFocus(true);
  treeWidget->resize(QSize(300,400));
  treeWidget->setHorizontalScrollBarPolicy(Qt::ScrollBarAsNeeded);
  treeWidget->setVerticalScrollBarPolicy(Qt::ScrollBarAsNeeded);

bool temp = connect(treeWidget, SIGNAL(itemClicked(QTreeWidgetItem*,int)), this,
        SLOT(currItemClicked(QTreeWidgetItem*, int)));
printf("value of temp for itemClicked = %d\n", temp);
temp = connect(treeWidget, SIGNAL(itemChanged(QTreeWidgetItem*,int)), this,
         SLOT(currItemClicked(QTreeWidgetItem*, int)));
printf("value of temp for itemChanged = %d\n", temp);
setupTreeItems();
temp = connect(this, SIGNAL(doubleClicked(QModelIndex)), this, SLOT(dblClick(QModelIndex)));
printf("value of temp for dblClick = %d\n", temp);

}

QTreeWidget* getTreeWidget()const { return treeWidget;}

void currItemClicked(QTreeWidgetItem* item, int col);
void setTreeItems(const std::multimap<std::string, std::string>& mapData) {}

private:
void setupTreeItems();

QTreeWidget* treeWidget;
};

@

Source file (test.cpp)
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#include <test.h>
#include <QApplication>
#include <QDialog>
#include <QTreeWidget>

void test::setupTreeItems()
{
QStringList header;
header << "One" << "Two" << "Three";

foreach(QString nms, header)
{
QTreeWidgetItem* field_ele = new QTreeWidgetItem(treeWidget, QStringList(QString(nms)));
field_ele->setCheckState(0, Qt::Unchecked);
field_ele->setFlags(Qt::ItemIsEnabled|Qt::ItemIsTristate|Qt::ItemIsUserCheckable);
}
treeWidget->resizeColumnToContents(0);

}

void test::currItemClicked(QTreeWidgetItem *item, int col)
{
printf("itemp->text = %s"n", qPrintable(item->text(0)));
}

int main(int argc, char** argv)
{
QApplication app(argc, argv);
QDialog *parent = new QDialog();
parent->setVisible(false);

test* testTreeWidget = new test(parent);
QTreeWidget* treeWidget = testTreeWidget->getTreeWidget();

parent->show();
treeWidget->show();

//If parent->show() is uncommented, then I can modify
//select/unselect qtreewidget items.


parent->exec&#40;&#41;;

return 0;

}
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Qt-4.8.4(opensource-CentOS)

sierdzio

Use qDebug() instead of printf. Could be that you are simply not seeing the output that is being generated. In line 13. put your QMainWindow as parent to get a nice hierarchy:
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treeWidget = new QTreeWidget(this);

// Then in main() you don't need to get and show your treewidget;
// it will be done automatically when you show main window.
// Also, you don't need that strange QDialog as parent of QMainWindow...
// this is all obsolete, as far as I can tell
@

Finally, to make it work:
In line 39. you need to mark your slots as slots:
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public slots:
void currItemClicked(QTreeWidgetItem* item, int col);
void setTreeItems(const std::multimap<std::string, std::string>& mapData) {}
@