Qt: 创建List, 添加删除Item

Qt: 创建List, 添加删除Item

#ifndef LISTWINDOW_H_
#define LISTWINDOW_H_

#include  < QDialog >

class  QPushButton;
class  QListWidget;
class  QWidget;

class  ListWindow :  public  QDialog  {
    Q_OBJECT
public:
    ListWindow(QWidget *parent = 0);
    virtual ~ListWindow();

public slots:
    void moveLeft();
    void moveRight();
    
private:
    QPushButton *moveLeftButton;
    QPushButton *moveRightButton;
    QListWidget *leftList;
    QListWidget *rightList;
} ;

#endif  /**/ /*LISTWINDOW_H_*/

#include  " ListWindow.h "
#include  < QPushButton >
#include  < QListWidget >
#include  < QWidget >
#include  < QHBoxLayout >
#include  < QVBoxLayout >
#include  < QGridLayout >
#include  < QStringList >
#include  < QListWidgetItem >

ListWindow::ListWindow(QWidget  * parent) :
    QDialog(parent)  {
    QGridLayout *gridLayout = new QGridLayout();
    gridLayout->addWidget(leftList = new QListWidget(), 0, 0, 3, 1);
    gridLayout->addWidget(moveLeftButton = new QPushButton("<<"), 0, 1, 1, 1);
    gridLayout->addWidget(moveRightButton = new QPushButton(">>"), 1, 1, 1, 1);
    gridLayout->addWidget(rightList = new QListWidget(), 0, 2, 3, 1);
    
    QObject::connect(moveLeftButton, SIGNAL(clicked()), this, SLOT(moveLeft()));
    QObject::connect(moveRightButton, SIGNAL(clicked()), this, SLOT(moveRight()));
    
    QStringList items;
    items << "One" << "Two" << "Three" << "Four" << "Five" << "Sechs"
            << "Sieben" << "One" << "Two" << "Three" << "Four" << "Five"
            << "Sechs" << "Sieben";
    leftList->addItems(items);
    
    this->setLayout(gridLayout);
}

ListWindow:: ~ ListWindow()  {
}

void  ListWindow::moveLeft()  {
    //    if (rightList->currentItem() == 0) {
    //        return;
    //    }
    //    
    //    QString text = rightList->currentItem()->text();
    //    delete rightList->currentItem();
    //    leftList->addItem(text);
    
    // The takeItem() method is used to remove an Item form one list without 
    // having to delete it. TakeItem() no deleting or no creating, more efficient.
    if (rightList->selectedItems().count() != 1) {
        return;
    }
    
    QListWidgetItem *item = rightList->takeItem(rightList->currentRow());
    leftList->addItem(item);
}

void  ListWindow::moveRight()  {
    //    if (leftList->currentItem() == 0) {
    //        return;
    //    }
    //    
    //    QString text = leftList->currentItem()->text();
    //    delete leftList->currentItem();
    //    rightList->addItem(text);

    if (leftList->selectedItems().count() != 1) {
        return;
    }
    
    QListWidgetItem *item = leftList->takeItem(leftList->currentRow());
    rightList->addItem(item);
}