因為下個星期要中要做一個關于QTreeWidget相關的東西，特先學習相關點東西，明天就直接開始做了。

涉及如下技術：

1、在QTreeWidget中添加頭（列頭）。

2、往QTreeWidget中添加數據。

3、右鍵響應菜單欄。

4、關聯信號與槽。

文件目錄如下：

運行截圖如下：

首先提供偽代碼，再提供完整代碼，最后提供整個項目的下載：

1、在QTreeWidget中添加頭（列頭）。

QStringList headers;headers.append("Filename");headers.append("Last Modified");headers.append("Type");headers.append("Size");ui->treeWidget->setHeaderLabels(headers);

2、往QTreeWidget中添加數據。

QTreeWidgetItem* Widget::AddItem(const QString &filename, const QString &last_modified, const QString &type, int size, QIcon icon, QTreeWidgetItem *parent){QTreeWidgetItem* item=new QTreeWidgetItem();item->setText(0,filename);item->setIcon(0,icon);item->setText(1,last_modified);item->setText(2,type);item->setText(3,QString::number(size));if(parent)parent->addChild(item);elseui->treeWidget->addTopLevelItem(item);return item; }

調用如下：

this->AddItem("Qt5開發實例.txt","2016-01-15","text file",8512,icon_file);this->AddItem("MFC開發實例.txt","2010-04-27","text file",4526,icon_file);this->AddItem("Java開發實例.txt","2011-12-7","text file",1526,icon_file);this->AddItem("C#開發實例.txt","2009-08-5","text file",7895,icon_file);QTreeWidgetItem* item=AddItem("video","2018-03-25","folder",0,icon_folder);AddItem("Qt管理系統開發視頻.mp4","2018-03-25","mp4 file",4512,icon_file,item);

3、右鍵響應菜單欄。

int Widget::OnWidgetContextMeun(const QPoint &pt){//當前選中項QTreeWidgetItem *selected=ui->treeWidget->itemAt(pt);//qDebug()<<row;QMenu menu;menu.addAction(ui->actionAdd);if(selected){menu.addAction(ui->actionRemove);}//顯示菜單menu.exec(ui->treeWidget->mapToGlobal(pt));return 0; }int Widget::OnMenuAdd(){QString msg=ui->treeWidget->currentItem()->text(0); //獲取當前行的數據//qDebug()<<msg;QMessageBox::information(this,tr("提示"),"當前選中的信息為:"+msg,QMessageBox::Ok);return 0; }int Widget::OnMenuRemove(){QString msg=ui->treeWidget->currentItem()->text(0); //獲取當前行的數據//qDebug()<<msg;QMessageBox::information(this,tr("提示"),"當前選中的信息為:"+msg,QMessageBox::Ok);return 0; }

4、關聯信號與槽。

ui->treeWidget->setContextMenuPolicy(Qt::CustomContextMenu);connect(ui->treeWidget,SIGNAL(customContextMenuRequested(QPoint)),this,SLOT(OnWidgetContextMeun(QPoint)));connect(ui->actionAdd,SIGNAL(triggered(bool)),this,SLOT(OnMenuAdd()));connect(ui->actionRemove,SIGNAL(triggered(bool)),this,SLOT(OnMenuRemove()));

要注意如下幾點：

右鍵時彈出快捷菜單（又稱：上下文菜單）
步驟：
(1)設置菜單策略setContextMenuPolicy(Qt::CustomContextMenu);
(2) 關聯信號customContextMenuRequested()在QWidget基類中有這個signal
(3) 事件處理(slot): 構造菜單、顯示

(4) 菜單響應(action)

其次要注意：

QPoint pt_global = ui.listWidget->mapToGlobal(pt) ;
menu.exec(pt_global);

要把這個QPoint轉換到全局坐標（屏幕坐標）

下面是整個源碼：

widget.h

#ifndef WIDGET_H #define WIDGET_H#include <QWidget> #include <QTreeWidget> #include <QTreeWidgetItem> #include <QMessageBox> #include <QIcon> #include <QMenu>namespace Ui { class Widget; }class Widget : public QWidget {Q_OBJECTpublic:explicit Widget(QWidget *parent = 0);~Widget();QTreeWidgetItem* AddItem(const QString &filename,const QString &last_modified,const QString &type,int size,QIcon icon,QTreeWidgetItem *parent=NULL);private slots:int OnWidgetContextMeun(const QPoint& pt); //右鍵彈出菜單int OnMenuAdd();int OnMenuRemove();private:Ui::Widget *ui; };#endif // WIDGET_H

widget.cpp

#include "widget.h" #include "ui_widget.h"#include <QDebug>Widget::Widget(QWidget *parent) :QWidget(parent),ui(new Ui::Widget) {ui->setupUi(this);ui->treeWidget->setColumnCount(4);//設置寬度ui->treeWidget->setColumnWidth(0,150);QStringList headers;headers.append("Filename");headers.append("Last Modified");headers.append("Type");headers.append("Size");ui->treeWidget->setHeaderLabels(headers);QIcon icon_folder(":/folder.png");QIcon icon_file(":/file.png");this->AddItem("Qt5開發實例.txt","2016-01-15","text file",8512,icon_file);this->AddItem("MFC開發實例.txt","2010-04-27","text file",4526,icon_file);this->AddItem("Java開發實例.txt","2011-12-7","text file",1526,icon_file);this->AddItem("C#開發實例.txt","2009-08-5","text file",7895,icon_file);QTreeWidgetItem* item=AddItem("video","2018-03-25","folder",0,icon_folder);AddItem("Qt管理系統開發視頻.mp4","2018-03-25","mp4 file",4512,icon_file,item);//右鍵彈出菜單-右鍵菜單支持ui->treeWidget->setContextMenuPolicy(Qt::CustomContextMenu);connect(ui->treeWidget,SIGNAL(customContextMenuRequested(QPoint)),this,SLOT(OnWidgetContextMeun(QPoint)));connect(ui->actionAdd,SIGNAL(triggered(bool)),this,SLOT(OnMenuAdd()));connect(ui->actionRemove,SIGNAL(triggered(bool)),this,SLOT(OnMenuRemove()));}int Widget::OnWidgetContextMeun(const QPoint &pt){//當前選中項QTreeWidgetItem *selected=ui->treeWidget->itemAt(pt);//qDebug()<<row;QMenu menu;menu.addAction(ui->actionAdd);if(selected){menu.addAction(ui->actionRemove);}//顯示菜單menu.exec(ui->treeWidget->mapToGlobal(pt));return 0; }int Widget::OnMenuAdd(){QString msg=ui->treeWidget->currentItem()->text(0); //獲取當前行的數據//qDebug()<<msg;QMessageBox::information(this,tr("提示"),"當前選中的信息為:"+msg,QMessageBox::Ok);return 0; }int Widget::OnMenuRemove(){QString msg=ui->treeWidget->currentItem()->text(0); //獲取當前行的數據//qDebug()<<msg;QMessageBox::information(this,tr("提示"),"當前選中的信息為:"+msg,QMessageBox::Ok);return 0; }QTreeWidgetItem* Widget::AddItem(const QString &filename, const QString &last_modified, const QString &type, int size, QIcon icon, QTreeWidgetItem *parent){QTreeWidgetItem* item=new QTreeWidgetItem();item->setText(0,filename);item->setIcon(0,icon);item->setText(1,last_modified);item->setText(2,type);item->setText(3,QString::number(size));if(parent)parent->addChild(item);elseui->treeWidget->addTopLevelItem(item);return item; }Widget::~Widget() {delete ui; }

main.cpp

#include "widget.h" #include <QApplication>int main(int argc, char *argv[]) {QApplication a(argc, argv);Widget w;w.show();return a.exec(); }

完整項目代碼下載地址：

https://download.csdn.net/download/qq78442761/10307122

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