使用绝对文件路径中的层次结构填充QTreeWidget

Question

我有一个文件,其中列出了绝对文件路径,每行1个.列出的文件是有序的,因此例如/Documents/dir中的所有文件将在文件中彼此之后列出.

我想要做的是将所有这些文件QTreeWidget放在一个漂亮的分层结构中,就像普通的文件系统一样.我如何从我的绝对路径文件中做到这一点？

这就是我对此进行编码的程度:

QFile file(FILENAME_ENCRYPTED);
QString line;
QDir dir;

QTreeWidgetItem *item;
if (file.open(QIODevice::ReadOnly)) {
    QTextStream stream( &file );
    do {
        line = stream.readLine();
        if (!line.isNull()) {
            dir = QDir(line);
            item = new QTreeWidgetItem();
            item->setText(0, dir.dirName());
            this->ui->treeWidget->addTopLevelItem(item);
        }
    } while (!line.isNull());
}
file.close();

这工作正常,但它只列出了彼此之后的所有文件名.我想我必须做一些递归函数,但递归不是我最好的朋友,我更喜欢迭代!有人能给我一个正确的方向吗？:)

Answer 1

不需要递归.您可以使用QString::split()基于分隔符(即"/")将文件路径拆分为QStringList中的单独QStrings,然后遍历每个QString以确定文件结构.

编辑:这是一个例子:

#include <QtGui>

const QString s1 = "Docs/Testing/textFile1.txt";
const QString s2 = "Docs/Testing/textFile2.txt";
const QString s3 = "Docs/Testing/textFile3.txt";
const QString s4 = "Docs/Testing/AnotherFolder/textFile4.txt";
const QString s5 = "ThisIsGonnaBeCrazy/WholeNewFolder/AndAnother/file.pdf";
const QString s6 = "ThisIsGonnaBeCrazy/file.doc";

class MainWindow : public QMainWindow
{
public:
    MainWindow()
    {
        QTreeWidget *treeWidget = new QTreeWidget;

        QStringList fileNames;
        fileNames << s1 << s2 << s3 << s4 << s5 << s6;

        QTreeWidgetItem *topLevelItem = NULL;
        foreach (const QString &fileName, fileNames)
        {
            QStringList splitFileName = fileName.split("/");

            // add root folder as top level item if treeWidget doesn't already have it
            if (treeWidget->findItems(splitFileName[0], Qt::MatchFixedString).isEmpty())
            {
                topLevelItem = new QTreeWidgetItem;
                topLevelItem->setText(0, splitFileName[0]);
                treeWidget->addTopLevelItem(topLevelItem);
            }

            QTreeWidgetItem *parentItem = topLevelItem;

            // iterate through non-root directories (file name comes after)
            for (int i = 1; i < splitFileName.size() - 1; ++i)
            {
                // iterate through children of parentItem to see if this directory exists
                bool thisDirectoryExists = false;
                for (int j = 0; j < parentItem->childCount(); ++j)
                {
                    if (splitFileName[i] == parentItem->child(j)->text(0))
                    {
                        thisDirectoryExists = true;
                        parentItem = parentItem->child(j);
                        break;
                    }
                }

                if (!thisDirectoryExists)
                {
                    parentItem = new QTreeWidgetItem(parentItem);
                    parentItem->setText(0, splitFileName[i]);
                }
            }

            QTreeWidgetItem *childItem = new QTreeWidgetItem(parentItem);
            childItem->setText(0, splitFileName.last());
        }

        setCentralWidget(treeWidget);
    }
};

int main(int argc, char *argv[])
{
    QApplication a(argc, argv);
    MainWindow w;
    w.show();
    return a.exec();
}

请注意,您可以根据需要使用QTreeWidgetItem::setData()设置每个文件的文件名.不过,我的例子不是那样做的.