一個小小工程師的心情抒發天地

Step1. design UI

t : treeView, l : listView 

Lay Out : Horizontally (Ctrl + H)

Step2. dialog.h

 #ifndef DIALOG_H  
 #define DIALOG_H  
 #include <QDialog>  
 #include <QtCore>  
 #include <QtGui>  
 #include <QDirModel>  
 #include <QInputDialog>  
 #include <QFileSystemModel>  
 namespace Ui {  
 class Dialog;  
 }  
 class Dialog : public QDialog  
 {  
   Q_OBJECT  
 public:  
   explicit Dialog(QWidget *parent = nullptr);  
   ~Dialog();  
 private slots:  
   void on_treeView_clicked(const QModelIndex &index);  
 private:  
   Ui::Dialog *ui;  
   QFileSystemModel *dirmodel;  
   QFileSystemModel *filemodel;  
 };  
 #endif // DIALOG_H  

Step2. dialog.cpp

 #include "dialog.h"  
 #include "ui_dialog.h"  
   
 Dialog::Dialog(QWidget *parent) :  
   QDialog(parent),  
   ui(new Ui::Dialog)  
 {  
   ui->setupUi(this);  
   
   QString strPath = "E:/";  
   dirmodel = new QFileSystemModel(this);  
   dirmodel->setFilter(QDir::NoDotAndDotDot| QDir::AllDirs);  
   dirmodel->setRootPath(strPath);  
   ui->treeView->setModel(dirmodel);  
   
   
   filemodel = new QFileSystemModel(this);  
   filemodel->setFilter(QDir::NoDotAndDotDot | QDir::Files);  
   filemodel->setRootPath(strPath);  
   ui->listView->setModel(filemodel);  
 }  
   
 Dialog::~Dialog()  
 {  
   delete ui;  
 }  
   
 void Dialog::on_treeView_clicked(const QModelIndex &index)  
 {  
   // setup List View  
   // When the user clicks on a node in the tree view,  
   // we want to be able to a extract the path out of that  
   // tree view and be set that path into our ListView  
   
   // absolute file path that will give us the full path that the user just clicked on.  
   QString strPath = dirmodel->fileInfo(index).absoluteFilePath();  
   ui->listView->setRootIndex(filemodel->setRootPath(strPath));  
   
 }