因?yàn)橄聜€(gè)星期要中要做一個(gè)關(guān)于QTreeWidget相關(guān)的東西，特先學(xué)習(xí)相關(guān)點(diǎn)東西，明天就直接開始做了。

涉及如下技術(shù)：

1、在QTreeWidget中添加頭（列頭）。

2、往QTreeWidget中添加數(shù)據(jù)。

3、右鍵響應(yīng)菜單欄。

4、關(guān)聯(lián)信號(hào)與槽。

文件目錄如下：

運(yùn)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(gè)項(xiàng)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(shù)據(jù)。

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(diào)用如下：

this->AddItem("Qt5開發(fā)實(shí)例.txt","2016-01-15","text file",8512,icon_file);this->AddItem("MFC開發(fā)實(shí)例.txt","2010-04-27","text file",4526,icon_file);this->AddItem("Java開發(fā)實(shí)例.txt","2011-12-7","text file",1526,icon_file);this->AddItem("C#開發(fā)實(shí)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(tǒng)開發(fā)視頻.mp4","2018-03-25","mp4 file",4512,icon_file,item);

3、右鍵響應(yīng)菜單欄。

int Widget::OnWidgetContextMeun(const QPoint &pt){//當(dāng)前選中項(xiàng)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(dāng)前行的數(shù)據(jù)//qDebug()<<msg;QMessageBox::information(this,tr("提示"),"當(dāng)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(dāng)前行的數(shù)據(jù)//qDebug()<<msg;QMessageBox::information(this,tr("提示"),"當(dāng)前選中的信息為:"+msg,QMessageBox::Ok);return 0; }

4、關(guān)聯(lián)信號(hào)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(diǎn)：

右鍵時(shí)彈出快捷菜單（又稱：上下文菜單）
步驟：
(1)設(shè)置菜單策略setContextMenuPolicy(Qt::CustomContextMenu);
(2) 關(guān)聯(lián)信號(hào)customContextMenuRequested()在QWidget基類中有這個(gè)signal
(3) 事件處理(slot): 構(gòu)造菜單、顯示

(4) 菜單響應(yīng)(action)

其次要注意：

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

要把這個(gè)QPoint轉(zhuǎn)換到全局坐標(biāo)（屏幕坐標(biāo)）

下面是整個(gè)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(shè)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(fā)實(shí)例.txt","2016-01-15","text file",8512,icon_file);this->AddItem("MFC開發(fā)實(shí)例.txt","2010-04-27","text file",4526,icon_file);this->AddItem("Java開發(fā)實(shí)例.txt","2011-12-7","text file",1526,icon_file);this->AddItem("C#開發(fā)實(shí)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(tǒng)開發(fā)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(dāng)前選中項(xiàng)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(dāng)前行的數(shù)據(jù)//qDebug()<<msg;QMessageBox::information(this,tr("提示"),"當(dāng)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(dāng)前行的數(shù)據(jù)//qDebug()<<msg;QMessageBox::information(this,tr("提示"),"當(dāng)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(xiàng)目代碼下載地址：

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

總結(jié)

以上是生活随笔為你收集整理的C++|Qt中QTreeWidget基本操作及完整代码下载的全部?jī)?nèi)容，希望文章能夠幫你解決所遇到的問題。

如果覺得生活随笔網(wǎng)站內(nèi)容還不錯(cuò)，歡迎將生活随笔推薦給好友。