QT treewideget怎么实现显示一个文件及文件夹里面的子文件夹

这个可以使用QTreeview和QFileSystemModel：官方文档例子如下：

It is simple to construct a tree view displaying data from a model. In the following example, the contents of a directory are supplied by a QFileSystemModel and displayed as a tree:

QFileSystemModel *model = new QFileSystemModel

model->setRootPath(QDir::currentPath())

QTreeView *tree = new QTreeView(splitter)

tree->setModel(model)

如果要使用QTreeWidget 就要使用QFileInfo对文件夹进行遍历，挨个添加到QTreeWidget中。有关QFileInfo请参考帮助文档：http://qt-project.org/doc/qt-4.8/qfileinfo.html

TreeWidget 与 TreeView 中实现右键菜单稍有不同，

TreeView 中是靠信号与槽

connect(ui->treeView,SIGNAL(customContextMenuRequested(constQPoint&)), this,SLOT(onCustomContextMenuRequested(constQPoint&)))

实现TreeView内不同地方的右键菜单，文章见 http://blog.csdn.net/liukang325/article/details/22734735

TreeWidget 中是靠重构 contextMenuEvent(QContextMenuEvent*event)

函数实现不同地方的不同右键菜单的。具体代码如下：

h文件：

[cpp] view plaincopy

private slots:

void onGrpMenuTriggered(QAction *action)

void onMemberMenuTriggered(QAction *action)

void onAddAreaMenuTriggered(QAction *action)

private:

//grp menu

QMenu *m_grpMenu

//child menu

QMenu *m_memberMenu

QMenu *m_addAreaMenu

//grp action

QAction *m_grpAddOneMember

QAction *m_grpDeleteGrp

QAction *m_grpAddOneGrp

//child action

QAction *m_memberDelete

QAction *m_memberMove

QAction *m_memberSyncTime

//action

QAction *m_addAreaAction

QAction *m_grpFlush

QAction *m_addDev

void createItemMenu()//构造函数中调用此函数

cpp文件：

[cpp] view plaincopy

void MainWindow::createItemMenu()

{

m_grpMenu = new QMenu(this)

m_memberMenu = new QMenu(this)

m_addAreaMenu = new QMenu(this)

connect(m_grpMenu,SIGNAL(triggered(QAction *)),

this,SLOT(onGrpMenuTriggered(QAction *)))

connect(m_memberMenu,SIGNAL(triggered(QAction *)),

this,SLOT(onMemberMenuTriggered(QAction *)))

connect(m_addAreaMenu,SIGNAL(triggered(QAction *)),

this,SLOT(onAddAreaMenuTriggered(QAction *)))

m_grpAddOneMember = new QAction(tr("增加子区域"),this)

m_grpAddOneMember->setIcon(QIcon(":/image/add.png"))

m_grpAddOneGrp = new QAction(tr("增加设备"),this)

m_grpAddOneGrp->setIcon(QIcon(":/image/add.png"))

m_grpDeleteGrp = new QAction(tr("删除区域"),this)

m_grpDeleteGrp->setIcon(QIcon(":/image/delete.png"))

m_memberDelete = new QAction(tr("删除设备"),this)

m_memberDelete->setIcon(QIcon(":/image/delete.png"))

m_memberMove = new QAction(tr("移动设备"),this)

m_memberMove->setIcon(QIcon(":/image/next.png"))

m_memberSyncTime = new QAction(tr("同步时间"),this)

m_memberSyncTime->setIcon(QIcon(":/image/move.png"))

m_addAreaAction = new QAction(tr("增加区域"),this)

m_addAreaAction->setIcon(QIcon(":/image/add.png"))

m_addDev = new QAction(tr("增加设备"),this)

m_addDev->setIcon(QIcon(":/image/add.png"))

m_grpFlush = new QAction(tr("刷新列表"),this)

m_grpFlush->setIcon(QIcon(":/image/update.png"))

}

//重构contextMenuEvent函数，记得#include <QContextMenuEvent>

void MainWindow::contextMenuEvent(QContextMenuEvent *event)

{

QTreeWidgetItem *item = ui->treeWidget->currentItem()

if(item == NULL)

{

qDebug()<<"空白处"

if (m_addAreaMenu->isEmpty())

{

//增加区域

m_addAreaMenu->addAction(m_addAreaAction)

m_addAreaMenu->addAction(m_addDev)

m_addAreaMenu->addAction(m_grpFlush)

}

//菜单出现的位置为当前鼠标的位置

m_addAreaMenu->exec(QCursor::pos())

}

else if(ui->treeWidget->currentItem()->childCount() >0)

{

if (m_grpMenu->isEmpty())

{

//增加子区域

m_grpMenu->addAction(m_grpAddOneMember)

//删除区域

m_grpMenu->addAction(m_grpDeleteGrp)

m_grpMenu->addAction(m_grpAddOneGrp)

}

m_grpMenu->exec(QCursor::pos())

}

else if(ui->treeWidget->currentItem()->childCount() == 0)

{

if (m_memberMenu->isEmpty())

{

//删除设备

m_memberMenu->addAction(m_memberDelete)

//移动设备

m_memberMenu->addAction(m_memberMove)

//同步时间

m_memberMenu->addAction(m_memberSyncTime)

}

m_memberMenu->exec(QCursor::pos())

}

event->accept()

}

void MainWindow::onGrpMenuTriggered(QAction *action)

{

if (action == m_grpAddOneMember)

{//增加子区域

}

else if (action == m_grpDeleteGrp)

{//删除区域

}

else if(action == m_grpAddOneGrp)

{

}

}

void MainWindow::onMemberMenuTriggered(QAction *action)

{

if (action == m_memberDelete)

{//删除设备

}

else if(action == m_memberMove)

{//移动设备

}

else if(action == m_memberSyncTime)

{//同步时间

}

}

void MainWindow::onAddAreaMenuTriggered(QAction *action)

{

if (action == m_addAreaAction)

{//增加区域

}

if(action == m_addDev)

{//增加设备

}

if(action == m_grpFlush)

{//刷新

}

}

树型结构的基本用法：

[cpp] view plaincopy

void MainWindow::createTreeWidget()

{

QIcon icon

icon.addPixmap(QPixmap(":/image/openStatus.png"), QIcon::Normal, QIcon::On)//节点打开状态

icon.addPixmap(QPixmap(":/image/closeStatus.png"), QIcon::Normal, QIcon::Off)//节点关闭状态

ui->treeWidget->setColumnCount(1)

QStringList headers

headers <<QObject::tr("管理")

ui->treeWidget->setHeaderLabels(headers)

QStringList rootName_1

rootName_1 <<QObject::tr("常用文件夹")

QTreeWidgetItem *rootItem_1 = new QTreeWidgetItem(ui->treeWidget, rootName_1)

// rootItem_1->setIcon(0, QIcon(":/image/add.png"))//增加静态图标

rootItem_1->setIcon(0,icon)

QStringList childName_1_1

childName_1_1 <<"所有未读"

QTreeWidgetItem *childItem_1_1 = new QTreeWidgetItem(rootItem_1, childName_1_1)

rootItem_1->addChild(childItem_1_1)

QStringList childName_1_2

childName_1_2 <<QObject::tr("置顶邮件")

QTreeWidgetItem *childItem_1_2 = new QTreeWidgetItem(rootItem_1, childName_1_2)

rootItem_1->addChild(childItem_1_2)

QStringList rootName_2

rootName_2 <<QObject::tr("我的邮箱")

QTreeWidgetItem *rootItem_2 = new QTreeWidgetItem(ui->treeWidget, rootName_2)

rootItem_2->setIcon(0,icon)

QStringList childName_2_1

childName_2_1 <<QObject::tr("收件箱")

QTreeWidgetItem *childItem_2_1 = new QTreeWidgetItem(rootItem_2, childName_2_1)

rootItem_2->addChild(childItem_2_1)

QStringList childName_2_2

childName_2_2 <<QObject::tr("草稿箱")

QTreeWidgetItem *childItem_2_2 = new QTreeWidgetItem(rootItem_2, childName_2_2)

rootItem_2->addChild(childItem_2_2)

QStringList childName_2_3

childName_2_3 <<QObject::tr("发件箱")

QTreeWidgetItem *childItem_2_3 = new QTreeWidgetItem(rootItem_2, childName_2_3)

rootItem_2->addChild(childItem_2_3)

ui->treeWidget->addTopLevelItem(rootItem_1)

ui->treeWidget->addTopLevelItem(rootItem_2)

QStringList childName_1_2_1

childName_1_2_1 <<"测试"

QTreeWidgetItem *childItem_1_2_1 = new QTreeWidgetItem(childItem_1_2, childName_1_2_1)

childItem_1_2->addChild(childItem_1_2_1)

}

另一篇TreeWidget 的用法，更加清晰明了的实现树状结构：http://blog.csdn.net/liukang325/article/details/13768523

补充：

childItem_1_2_1->setForeground(0,QBrush(QColor(Qt::blue)))

// 可将某一项的字体变颜色！

①执行“视图→工具栏→控件工具箱”命令，展开“其他控件”按钮，“控件工具箱”工具栏

②单击工具栏上，在d出的下拉列表中，选择“ShockwaveFlashObject”选项，当鼠标变成细十字线，按住左键在工作区中拖出一个矩形（这就是后来的播放窗口）。当

③鼠标移到矩形框入右下角拖动方向的箭头，按住左键并拖动来调整矩形的大小的权利。在矩形框

④单击鼠标右键，在随后d出的快捷菜单中选择“属性”选项，打开“属性”对话框中，输入需要在“电影”插入Flash动画文件名后面的框和完整路径，然后选择关闭“属性”窗口。

【注】：为了方便移动演示，与保存在同一文件夹中的Flash动画文件的最佳表现，那么路径也可以使用相对路径。

[提示]：Flash动画文件名和完整路径需要插入最好的英文字符！

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