创建QTreeWidget组件

#ifndef DIALOG_H

#define DIALOG_H

#include <QDialog>

#include<QTreeWidgetItem>

namespace Ui {

class Dialog;

}

class Dialog : public QDialog

{

    Q_OBJECT

public:

    explicit Dialog(QWidget *parent = 0);

    ~Dialog();

private slots:

    void on_pushButton_clicked();

private:

    Ui::Dialog *ui;

private:

    void addRoot(QString name);

    void add_Child(QTreeWidgetItem* parent, QString name);

};

#endif // DIALOG_H

//实现

#include "dialog.h"

#include "ui_dialog.h"

#include<QFont>

#include<QMessageBox>

Dialog::Dialog(QWidget *parent) :

    QDialog(parent),

    ui(new Ui::Dialog)

{

    ui->setupUi(this);

    //创建三个顶级目录

    addRoot("Root Level One");

    addRoot("Root Level Two");

    addRoot("Root Level Three");

}

Dialog::~Dialog()

{

    delete ui;

}

void Dialog:: addRoot(QString name)

{

    QTreeWidgetItem *itm = new QTreeWidgetItem(ui->treeWidget);//传递父对象

    itm->setText(0,name);

    QFont serifFont("Times", 10, QFont::Bold);

    itm->setFont(0, serifFont);

    itm->setWhatsThis(0, "Root Level Tree");

    ui->treeWidget->addTopLevelItem(itm);//把item添加为顶层

    //添加6个child组件

    add_Child(itm, "One Level");

    add_Child(itm, "Two Level");

    add_Child(itm, "Three Level");

    add_Child(itm, "Four Level");

    add_Child(itm, "Five Level");

    add_Child(itm, "Six Level");

}

void Dialog:: add_Child(QTreeWidgetItem* parent, QString name)

{

    //创建组件

    QTreeWidgetItem *itm = new QTreeWidgetItem();

    itm->setText(0,name);

    //设置字体

    QFont childFont;

    childFont.setWeight(QFont::Black);

    childFont.setStyle(QFont::StyleOblique);

    childFont.setUnderline(true);

    itm->setFont(0, childFont);

    itm->setBackgroundColor(0,Qt::gray);

    itm->setTextColor(0,Qt::red);

    //把上面定义好的组件以child的形式添加到顶级组件中

    parent->addChild(itm);

}

void Dialog::on_pushButton_clicked()

{

ui->treeWidget->currentItem()->setBackgroundColor(0, Qt::cyan);

}

//测试

#include <QtGui/QApplication>

#include "dialog.h"

int main(int argc, char *argv[])

{

    QApplication a(argc, argv);

    Dialog w;

    w.show();

    return a.exec();

}

//结果