怎么向treewidget中添加

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！

在自定义的delegate中检查if(index.data(Qt::UserRole).toString() == "your value")的值，该值在QTreeWidget中要预先设定。这样就可以在让指定QTreeWidgetItem->setData(1, (Qt::UserRole), "your value")的QTreeWidgetItem使用相对应的delegate了.

就在构造函数里面加上以下两行代码即可：

//根据内容自动设置列宽

ui->treeWidget->header()->setResizeMode(QHeaderView::ResizeToContents)

ui->treeWidget->header()->setStretchLastSection(false)

在解决完上述问题后，又遇到一个问题，就是用鼠标左键或者右键单击QTreeWidget里面的选项时，水平滚动条会自动跑到最左边，双击不会出现这个问题，详细查阅了QTreeWidget的实现代码，在其父类中有个事件处理函数void QAbstractItemView::timerEvent(QTimerEvent *event)，加了一个滚动处理，这里真是有点晕了，它的注释就是“we only get here if there was no double click”，大家可以看下这里为什么要加这个滚动处理。

解决方法如下(我已经对QTreeWidget进行了二次封装，就直接在这上面改的，不封装照样可以实现，原理是一样的)：

1.加两个变量，记录是否有选项被点击，一个记录点击时的水平滚动条位置

bool m_isItemClicked

int m_horizontalScrollBarPos

2.对两个事件进行处理

connect(ui->treeWidget->horizontalScrollBar(), SIGNAL(valueChanged(int)), this,SLOT(scrollbarchange(int)))

void MainWindow::on_treeWidget_itemClicked(QTreeWidgetItem *item, int column)

{

m_isItemClicked = true

m_horizontalScrollBarPos = ui->treeWidget->horizontalScrollBar()->sliderPosition()

}

void MainWindow::scrollbarchange(int value)

{

if (m_isItemClicked)

{

ui->treeWidget->horizontalScrollBar()->setValue(m_horizontalScrollBarPos)

m_isItemClicked = false

}

}

1.继承QTreewidget重新实现他的mouseReleaseEvent方法，为什么是release方法，因为源码里面mousePressEvent方法用来绘制treeWidget，而release方法则会发送出点击事件的信号

#ifndefTREEWIDGET_H

#define TREEWIDGET_H

#ifndef TREEWIDGET_H

#define TREEWIDGET_H

#include <QWidget>

#include <QTreeWidget>

#include <QMouseEvent>

class QTreeWidget2 : public QTreeWidget

{

Q_OBJECT

public:

explicit QTreeWidget2( QWidget *parent = 0 )

protected:

void mouseReleaseEvent (QMouseEvent *event)

}

#endif // TREEWIDGET_H

2.实现

#include "treeWidget.h"

QTreeWidget2::QTreeWidget2( QWidget *parent)

:QTreeWidget(parent)

{

}

void QTreeWidget2::mouseReleaseEvent (QMouseEvent *event)

{

if (event->button () &Qt::RightButton )

{

emit customContextMenuRequested( event->pos ())

}else if (event->button () &Qt::LeftButton){

emit itemClicked(itemFromIndex (indexAt ( event->pos () )),indexAt ( event->pos () ).column ())

}

}

3.测试

#ifndef MAINWINDOW_H

#define MAINWINDOW_H

#include <QMainWindow>

#include <QTreeWidgetItem>

class QTreeWidget2

static const int itemtype1 = QTreeWidgetItem::Type

class MainWindow : public QMainWindow

{

Q_OBJECT

public:

explicit MainWindow( QWidget *parent = 0 )

public slots:

void setTest2(const QPoint &pos)

void setTest(QTreeWidgetItem*item,int column)

private:

QTreeWidget2 *treeWidget

QTreeWidgetItem *currentItem

}

#endif // MAINWINDOW_H

#include "mainwindow.h"

#include "treeWidget.h"

#include <QMessageBox>

#include <QtDebug>

MainWindow::MainWindow(QWidget *parent):

QMainWindow(parent)

{

treeWidget = new QTreeWidget2

treeWidget->setContextMenuPolicy(Qt::CustomContextMenu)

treeWidget->setHeaderLabel ( tr("资源列表") )

QTreeWidgetItem *root = new QTreeWidgetItem( treeWidget )

root->setText (0,tr("root"))

QTreeWidgetItem *item = new QTreeWidgetItem( root )

item->setText (0,tr("a"))

QTreeWidgetItem *item1 = new QTreeWidgetItem( item )

item1->setText (0,tr("b"))

QTreeWidgetItem *item2 = new QTreeWidgetItem( item1 )

item2->setText (0,tr("c"))

connect( treeWidget,SIGNAL(customContextMenuRequested( const QPoint &)),

this,SLOT(setTest2(const QPoint &)))

connect( treeWidget,SIGNAL(itemClicked(QTreeWidgetItem*,int)),

this,SLOT(setTest(QTreeWidgetItem*,int)))

setCentralWidget ( treeWidget )

resize ( 500,400 )

}

void MainWindow::setTest2(const QPoint &pos)

{

currentItem = treeWidget->itemAt(pos)

if ( currentItem == NULL )

return

QMessageBox::warning (this,tr("test"),tr("hello"))

}

void MainWindow::setTest(QTreeWidgetItem*item,int column)

{

QMessageBox::warning (this,tr("asd"),tr("sd"))

---