QT MVC 模型/视图

1、 模型视图实例一， QFileSystemModel  QTreeView ，model/view示例。

#include <QApplication>
#include <QFileSystemModel>
#include <QTreeView>
#include <QListView>
#include <QStandardItemModel>
#include <QDebug>

int main(int argc, char *argv[])
{
    QApplication a(argc, argv);
    QFileSystemModel model;
    model.setRootPath("/");

    QTreeView tree;
    tree.setModel(&model);
    tree.setRootIndex(model.index("/"));
    tree.setFixedSize(500, 400);
    tree.show();
    return a.exec();
}

 2. QStandardItemModel 模型

#include "dialog.h"
#include <QApplication>
#include <QFileSystemModel>
#include <QTreeView>
#include <QListView>
#include <QStandardItemModel>
#include <QDebug>

int main(int argc, char *argv[])
{
    QApplication a(argc, argv);
    QStandardItemModel model;
    QStandardItem *parentItem = model.invisibleRootItem();

    QStandardItem *item0 = new QStandardItem;
    item0->setText("A");
    QPixmap pixmap0(50, 50);
    pixmap0.fill("red");
    item0->setIcon(QIcon(pixmap0));
    item0->setToolTip("indexA");

    parentItem->appendRow(item0);
    parentItem = item0;

    QStandardItem *item1 = new QStandardItem;
    item1->setText("B");
    QPixmap pixmap1(50, 50);
    pixmap1.fill("green");
    item1->setIcon(QIcon(pixmap1));
    item1->setToolTip("indexB");
    parentItem->appendRow(item1);

    QStandardItem *item2 = new QStandardItem;
    item2->setText("C");
    QPixmap pixmap2(50, 50);
    pixmap2.fill("blue");
    item2->setIcon(QIcon(pixmap2));
    item2->setToolTip("indexC");
    parentItem->appendRow(item2);

    QTreeView view;
    view.setModel(&model);
    view.show();

    QModelIndex indexA = model.index(0,0,QModelIndex());
    qDebug() << "indexA row count: " << model.rowCount(indexA);
    QModelIndex indexB = model.index(1,0,indexA);
    qDebug() << "indexB text: " << model.data(indexB, Qt::EditRole).toString();

    return a.exec();
}