#include "mailclient.h"#include "ui_mailclient.h"#include 
    
     #include 
     
      MailClient::MailClient(QWidget *parent) :    QMainWindow(parent),    ui(new Ui::MailClient){    ui->setupUi(this);    this->setCentralWidget(ui->splitter_2);    ui->splitter_2->setStretchFactor(2,2);    QIcon folderIcon(style()->standardPixmap(QStyle::SP_DirClosedIcon));    QIcon trashIcon(style()->standardPixmap(QStyle::SP_FileIcon));    QStringList labels;    labels <
      
       treeWidget_2->setHeaderLabels(labels);    addFolder(folderIcon,tr("Inbox"));    addFolder(folderIcon,tr("Outbox"));    addFolder(folderIcon,tr("Sent"));    addFolder(trashIcon,tr("Trash"));    QStringList messageLabels;    messageLabels << tr("Subject") << tr("Sender") << tr("Date");    addMessage(tr("Hello Qt"),tr("
       
        "),tr("2016/06/29"));    addMessage(tr("Hello Qt"),tr("
        
         "),tr("2016/06/29"));    addMessage(tr("Hello Qt"),tr("
         
          "),tr("2016/06/29")); ui->treeWidget->setHeaderLabels(messageLabels);}MailClient::~MailClient(){ delete ui;}void MailClient::addMessage(const QString &subject,const QString &from,const QString &data){ QTreeWidgetItem *newItem = new QTreeWidgetItem(ui->treeWidget); newItem->setText(0,subject); newItem->setText(1,from); newItem->setText(2,data); if(!ui->treeWidget->currentItem()) ui->treeWidget->setCurrentItem(newItem);}void MailClient::addFolder(const QIcon &icon, const QString &name){ QTreeWidgetItem *root; if(ui->treeWidget_2->topLevelItemCount()==0) { root = new QTreeWidgetItem(ui->treeWidget_2); root->setText(0,tr("Mail")); ui->treeWidget_2->setItemExpanded(root,true); } else { root = ui->treeWidget_2->topLevelItem(0); } QTreeWidgetItem *newItem = new QTreeWidgetItem(root); newItem->setText(0,name); newItem->setIcon(0,icon); if(!ui->treeWidget_2->currentItem()) ui->treeWidget_2->setCurrentItem(newItem);}
         
        
       
      
     
    

#ifndef MAILCLIENT_H#define MAILCLIENT_H#include 
    
     namespace Ui {class MailClient;}class MailClient : public QMainWindow{    Q_OBJECTpublic:    explicit MailClient(QWidget *parent = 0);    ~MailClient();private:    Ui::MailClient *ui;    void addFolder(const QIcon &icon,const QString &name);    void  addMessage(const QString &subject,const QString &from,const QString &data);};#endif // MAILCLIENT_H