Question

我有一个QListWidget，位于QWizardPage中的QGridLayout中。 QListWidget中的项目是目录中的所有xml文件。我有一切工作，但信号。我错过了一些关键而且简单的东西，我确定。

我查看了QListWidget文档以及this和this帖子等。一切似乎都说itemClicked（QListWidgetItem *）应该是我需要的，但它和其他人都没有工作，即我的函数new_sequence_selected永远不会被调用。 Connect也永远不会为此返回句柄，总是错误的。

我尝试过的大部分信号都在下面的代码中。

我的browseButton工作正常。

其他信息：在Win7，VS2012，Qt5，Qt VS插件1.2.2中工作

提前感谢您的帮助!!

creator.h

#include <qwizard.h>
#include <QtWidgets>
#include <QHeaderView>

class Sequence_selectPage :  public QWizardPage
{
    Q_OBJECT

public: Sequence_selectPage( QWidget *parent = 0 );

private slots:
    void browse();
private:
    QListWidget *sequenceList;
    QDir sequences_dir_path;
    QString selected_sequence;
};

creator.cpp

#include "creator.h"

Sequence_selectPage::Sequence_selectPage( QWidget *parent ) : QWizardPage( parent )
{
    first_round = true;

    setTitle( tr( "Select an xml" ) );
    // setup path to Sequence
    sequences_dir_path.absolutePath();
    sequences_dir_path.cd( "Sequence" );


    //set up the list for the files
    sequenceList = new QListWidget( this );
    //sequenceList->setSelectionMode( QAbstractItemView::SingleSelection );
    QStringList filter;
    filter << "*.xml";

    //add xmls to list
    foreach( QString File, sequences_dir_path.entryList( filter, QDir::Files ) )      //(QStringList)"*.xml"
    {
        sequenceList->addItem( File );
    }

    if( sequenceList->count() > 0 )
    {
        sequenceList->item( 0 )->setSelected( true );
    }

    browseButton = buttonBuilder( tr( "Browse..." ), this, SLOT( browse() ) );

    /*********** Figure out this signal **********/
    connect( sequenceList, SIGNAL( sequenceList->itemClicked( QListWidgetItem* i ) ), this, SLOT( new_sequence_selected( QListWidgetItem* i) ) );
    //connect( sequenceList, SIGNAL( itemClicked( QListWidgetItem* ) ), this, SLOT( new_sequence_selected( QListWidgetItem* ) ) );
    //connect( sequenceList, SIGNAL( itemActivated( QListWidgetItem* ) ), this, SLOT( new_sequence_selected( QListWidgetItem* ) ) );
    //connect( sequenceList, SIGNAL( itemEntered( QListWidgetItem* ) ), this, SLOT( new_sequence_selected( QListWidgetItem* ) ) );
    //connect( sequenceList, SIGNAL( itemPressed( QListWidgetItem* ) ), this, SLOT( new_sequence_selected( QListWidgetItem* ) ) );
    //connect( sequenceList, SIGNAL( itemSelectionChanged( ) ), this, SLOT( new_sequence_selected( ) ) );
    //connect( sequenceList, SIGNAL( itemDoubleClicked( QListWidgetItem* ) ), this, SLOT( new_sequence_selected( QListWidgetItem* ) ) );
    //connect( sequenceList, SIGNAL( itemChanged( QListWidgetItem* ) ), this, SLOT( new_sequence_selected( QListWidgetItem* ) ) );
    //connect( sequenceList, SIGNAL( currentItemChanged( QListWidgetItem*, QListWidgetItem* ) ), this, SLOT( new_sequence_selected( QListWidgetItem* ) ) );

    selectpageLayout = new QGridLayout( this );
    selectpageLayout->addWidget( sequenceList, 0, 0, 1, 2 );
    selectpageLayout->addWidget( browseButton, 1, 1 );

    setLayout( selectpageLayout );
}

void Sequence_selectPage::new_sequence_selected( QListWidgetItem* sequence )
{
    selected_sequence = sequence->text();
}

buttonBuilder代码

QPushButton *buttonBuilder( QString &button_name, QObject *receiver, const char *member )
{
    QPushButton *mybutton = new QPushButton( button_name );
    QObject::connect( mybutton, SIGNAL( clicked() ), receiver, member );
    return mybutton;
}

Answer 1

您没有将new_sequence_selected声明为广告位。

试试这个：

#include <qwizard.h>
#include <QtWidgets>
#include <QHeaderView>

class Sequence_selectPage :  public QWizardPage
{
    Q_OBJECT

public: Sequence_selectPage( QWidget *parent = 0 );

private slots:
    void browse();
    void new_sequence_selected( QListWidgetItem* sequence ); //<-- ADDED THIS
private:
    QListWidget *sequenceList;
    QDir sequences_dir_path;
    QString selected_sequence;
};

Qt信号连接失败

1 个答案: