1. 檔案目錄瀏覽器

直接在main.cpp檔案中新增下列程式碼

#include "mainwindow.h"

#include <QApplication>
#include <QAbstractItemModel>
#include <QAbstractItemView>
#include <QItemSelectionModel>

#include <QDirModel>
#include <QTreeView>
#include <QListView>
#include <QTableView>
#include <QSplitter>

// MV model view
int main(int argc, char* argv[]) {
    QApplication a(argc, argv);
    //首先建立一個檔案模型
    QDirModel model;
    //三種顯示模式
    QTreeView tree;
    QListView list;
    QTableView table;
    // 設定view物件的model
    tree.setModel(&model);
    list.setModel(&model);
    table.setModel(&model);
    tree.setSelectionMode(QAbstractItemView::SingleSelection);   //單選
//  tree.setSelectionMode(QAbstractItemView::MultiSelection);   //多選
    list.setSelectionMode(QAbstractItemView::MultiSelection);   //多選
//  table.setSelectionMode(tree.selectionModel());   //多選
    table.setSelectionMode(QAbstractItemView::MultiSelection);   //多選
    QObject::connect(&tree,   SIGNAL(doubleClicked(QModelIndex)), &list, SLOT(setRootIndex(QModelIndex)));
    QObject::connect(&tree,   SIGNAL(doubleClicked(QModelIndex)), &table, SLOT(setRootIndex(QModelIndex)));
    QSplitter* splitter = new QSplitter;
    // 添加布局
    splitter->addWidget(&tree);
    splitter->addWidget(&list);
    splitter->addWidget(&table);
    splitter->setWindowTitle(QObject::tr("Model/View"));
    splitter->show();
    return a.exec();
}

 

為了實現雙擊QTreeView物件中的某個目錄時,QListView物件和QTableView物件中顯示此選定目錄下的所有檔案和目錄，需要連線QTreeView物件的doubleClicked()訊號與QListView物件和QTableView物件的setRootIndex()槽函式。

    QObject::connect(&tree,   SIGNAL(doubleClicked(QModelIndex)), &list, SLOT(setRootIndex(QModelIndex)));
    QObject::connect(&tree,   SIGNAL(doubleClicked(QModelIndex)), &table, SLOT(setRootIndex(QModelIndex)));
 

其中 setRootIndex的介紹如下

QModelIndex的介紹如下

QModelIndex類用於定位資料模型中的資料。

doubleClicked訊號如下，這個訊號不是在tree裡面的而是QAbstractItemView裡面的
QAbstractItemView::doubleClicked(const QModelIndex &index)

This signal is emitted when a mouse button is double-clicked. The item the mouse was double-clicked on is specified by index. The signal is only emitted when the index is valid.

這個訊號在雙擊滑鼠按鈕時發出。滑鼠雙擊的專案由index指定。該訊號只在索引有效時發出。