帮我写一个qt 搜索补全效果-QT开发中文网

以下是一个简单的Qt搜索补全的实现示例：

#include <QtWidgets>
#include <vector>

class SearchCompleter : public QCompleter {
public:
    SearchCompleter(QObject *parent = nullptr) : QCompleter(parent) {}

    void update(QStringList suggestions) {
        model()->setStringList(suggestions);
    }

protected:
    QStringList splitPath(const QString &path) const override {
        // Split the input text into individual search terms. In this example,
        // we'll simply split by whitespace, but you could use a regular
        // expression or other method to create more advanced search terms.
        return path.split(" ", Qt::SkipEmptyParts);
    }
};

class SearchWidget : public QWidget {
public:
    SearchWidget(QWidget *parent = nullptr) : QWidget(parent) {
        // Set up the UI elements for our search widget.
        QHBoxLayout *layout = new QHBoxLayout(this);
        QLineEdit *searchBox = new QLineEdit(this);
        QPushButton *searchButton = new QPushButton("Search", this);
        layout->addWidget(searchBox);
        layout->addWidget(searchButton);

        // Create a completer object and attach it to the search box.
        completer = new SearchCompleter(searchBox);
        searchBox->setCompleter(completer);

        // Connect the search button's clicked signal to perform the search.
        connect(searchButton, &QPushButton::clicked, this, &SearchWidget::performSearch);
    }

    void setSuggestions(const std::vector<QString> &suggestions) {
        // Convert the vector of suggestions to a QStringList and update the completer.
        QStringList suggestionList;
        for (const auto &suggestion : suggestions) {
            suggestionList << suggestion;
        }
        completer->update(suggestionList);
    }

signals:
    void searchRequested(const QString &query);

private:
    SearchCompleter *completer;

    void performSearch() {
        // Get the current text in the search box and emit a signal for the search query.
        QString query = static_cast<QLineEdit *>(layout()->itemAt(0)->widget())->text();
        emit searchRequested(query);
    }
};

class MainWindow : public QMainWindow {
public:
    MainWindow(QWidget *parent = nullptr) : QMainWindow(parent) {
        // Set up a simple UI with a search widget and label to display results.
        QWidget *centralWidget = new QWidget(this);
        QVBoxLayout *layout = new QVBoxLayout(centralWidget);
        searchWidget = new SearchWidget(centralWidget);
        resultsLabel = new QLabel("Results will be displayed here.", centralWidget);
        layout->addWidget(searchWidget);
        layout->addWidget(resultsLabel);
        setCentralWidget(centralWidget);

        // Connect the searchRequested signal to our slot to handle the search query.
        connect(searchWidget, &SearchWidget::searchRequested, this, &MainWindow::handleSearch);
    }

private:
    SearchWidget *searchWidget;
    QLabel *resultsLabel;

    void handleSearch(const QString &query) {
        // For this example, we'll simply display the search query as the result.
        resultsLabel->setText(QString("Search results for \"%1\".").arg(query));
    }
};

int main(int argc, char **argv) {
    QApplication app(argc, argv);
    MainWindow mainWindow;
    mainWindow.show();
    return app.exec();
}

这个示例实现了一个简单的搜索补全效果。当用户在搜索框中输入文本时，我们将其分割成一系列搜索项，并使用它们来更新 QCompleter 对象的字符串列表。然后，我们将 QCompleter 附加到 QLineEdit 上，以显示补全建议。当用户单击搜索按钮时，我们获取当前搜索文本，并发出一个信号来处理查询。在 MainWindow 类中，我们使用这个查询来显示简单的结果标签。