Method FolderIconSelector

folderIconSelector.cpp:19–104

QFileIconProvider FolderIconSelector::iconPro;
FolderIconSelector::FolderIconSelector(const QString& dirPath, QWidget *parent)
    : QWidget(parent)
    , ui(new Ui::FolderIconSelector)
    , dirPath(dirPath)
{
    ui->setupUi(this);
    // 不加这句的话，无法设置item高度（原因未知）
    // https://blog.csdn.net/lilongwei_123/article/details/109503886
    ui->comboBox->setView(new QListView());

    ui->comboBox->installEventFilter(this);

    connect(ui->btn_apply, &QPushButton::clicked, this, [=](){
        auto iconPath = ui->comboBox->currentData().toString();
        if (iconPath.isEmpty()) return;

        if (Util::isInDir(iconPath, dirPath)) // 若icon在folder内，则转为相对路径
            iconPath = QDir(dirPath).relativeFilePath(iconPath);

        qDebug() << "Folder:" << dirPath << "Icon:" << iconPath;
        if (Util::setFolderIcon(dirPath, iconPath)) {
            QPixmapCache::clear(); // 清除缓存，否则文件夹图标不会更新
            setIcon(iconPro.icon(dirPath));
        } else {
            showActionFailed();
            // 貌似在不重启的情况下，无法UAC提权
            QMessageBox::warning(this, "Failed", "Failed to set folder icon.\nTry restart as [Administrator].");
        }
    });

    connect(ui->btn_select, &QToolButton::clicked, this, [=]{
       auto iconPath = QFileDialog::getOpenFileName(this, "Select an icon", dirPath, "Icon Files (*.ico *.exe)");
       if (iconPath.isEmpty()) return;
       addIconCandidate(iconPath);
       int index = ui->comboBox->count() - 1;
       ui->comboBox->setCurrentIndex(index);
    });

    setIcon(iconPro.icon(dirPath));

    // 异步，否则QCombobox的宽度会不太正常（不对齐）
    QTimer::singleShot(0, this, [=](){
        QDir dir(dirPath);
        ui->label->setText(dir.isRoot() ? dirPath : dir.dirName());
        auto files = Util::getExeFiles(dirPath);
        // 展示可选exe图标
        ui->comboBox->setUpdatesEnabled(false);
        for (const QString& path : files)
            addIconCandidate(path);

        // 选中当前文件夹的图标
        auto iconPath = Util::getFolderIconPath(dirPath);
        iconPath = QDir::toNativeSeparators(iconPath);
        if (!iconPath.isEmpty()) {
            int index = ui->comboBox->findData(iconPath, Qt::UserRole, Qt::MatchFixedString); // CaseInsensitive
            if (index == -1)
                index = findMatchedComboTextIndex(ui->label->text());
            if (index != -1)