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QListWidgetItem *item = new QListWidgetItem(textEdit->toPlainText());
listWidget->addItem(item);
textEdit->clear();

QObject::connect(ui->listWidget, SIGNAL(activated(QModelIndex)), this, SLOT(slotus2())); 

void test ::slotus2()
{
   ui->listWidget->setCurrentItem(ui->textEdit->(???));

}

void test ::slotus2()
{
    QListWidgetItem* item = 0;
    QListWidgetItem::setFlags(Qt::ItemIsEnable);
    ui->textEdit-> ???
    }

void QListWidget::itemDoubleClicked ( QListWidgetItem * item )   [signal]
This signal is emitted with the specified item when a mouse button is double clicked on an item in the widget.

See also itemClicked() and itemPressed().

void QAbstractItemView::doubleClicked ( const QModelIndex & index )   [signal]
This signal is emitted when a mouse button is double-clicked. The item the mouse was double-clicked on is specified by index. The signal is only emitted when the index is valid.

See also clicked() and activated().

#include "test.h"
#include "ui_test.h"

test::test(QWidget *parent) :
    QMainWindow(parent),
    ui(new Ui::test)
{
    ui->setupUi(this);
    QObject::connect(ui->pushButton, SIGNAL(clicked()),this, SLOT(slotus()));
    QObject::connect(ui->listWidget, SIGNAL(doubleClicked(QModelIndex)), this, SLOT(slotus2()));


}

test::~test()
{
    delete ui;
}

void test ::slotus()
{
    QListWidgetItem *item = new QListWidgetItem(ui->textEdit->toPlainText());
    ui->listWidget->addItem(item);
    ui->textEdit->clear();


}


void test::slotus2()
{
    QListWidgetItem *item=0;
    ui->textEdit_2->setText(item->text());
}

#ifndef TEST_H
#define TEST_H

#include <QMainWindow>
#include<QModelIndex>

namespace Ui {
    class test;
}

class test : public QMainWindow
{
    Q_OBJECT

public:
    explicit test(QWidget *parent = 0);
    ~test();

private:
    Ui::test *ui;

private slots:
    void slotus();
    void slotus2(QModelIndex);
};

#endif // TEST_H

#include "test.h"
#include "ui_test.h"

test::test(QWidget *parent) :
    QMainWindow(parent),
    ui(new Ui::test)
{
    ui->setupUi(this);
    QObject::connect(ui->pushButton, SIGNAL(clicked()), this, SLOT(slotus()));
    QObject::connect(ui->listWidget, SIGNAL(doubleClicked(QModelIndex)), this, SLOT(slotus2(QModelIndex)));
}

test::~test()
{
    delete ui;
}

void test::slotus()
{
    QListWidgetItem *item = new QListWidgetItem(ui->textEdit->toPlainText());
    ui->listWidget->addItem(item);
    ui->textEdit->clear();
}

void test::slotus2(QModelIndex index)
{
    ui->textEdit->setText(index.data(Qt::DisplayRole).toString());
}