Ladybird: Add autocomplete to LocationEdit

Ladybird/Qt/AutoComplete.h

@@ -0,0 +1,85 @@
+/*
+ * Copyright (c) 2023, Cameron Youell <cameronyouell@gmail.com>
+ *
+ * SPDX-License-Identifier: BSD-2-Clause
+ */
+
+#pragma once
+
+#include "StringUtils.h"
+#include <AK/Forward.h>
+#include <AK/String.h>
+#include <QCompleter>
+#include <QNetworkReply>
+#include <QTreeView>
+
+namespace Ladybird {
+
+class AutoCompleteModel final : public QAbstractListModel {
+    Q_OBJECT
+public:
+    explicit AutoCompleteModel(QObject* parent)
+        : QAbstractListModel(parent)
+    {
+    }
+
+    virtual int rowCount(QModelIndex const& parent = QModelIndex()) const override { return parent.isValid() ? 0 : m_suggestions.size(); }
+    virtual QVariant data(QModelIndex const& index, int role = Qt::DisplayRole) const override
+    {
+        if (role == Qt::DisplayRole || role == Qt::EditRole)
+            return qstring_from_ak_string(m_suggestions[index.row()]);
+        return {};
+    }
+
+    void add(String const& result)
+    {
+        beginInsertRows({}, m_suggestions.size(), m_suggestions.size());
+        m_suggestions.append(result);
+        endInsertRows();
+    }
+
+    void clear()
+    {
+        beginResetModel();
+        m_suggestions.clear();
+        endResetModel();
+    }
+
+private:
+    AK::Vector<String> m_suggestions;
+};
+class AutoComplete final : public QCompleter {
+    Q_OBJECT
+
+public:
+    AutoComplete(QWidget* parent);
+
+    virtual QString pathFromIndex(QModelIndex const& index) const override
+    {
+        return index.data(Qt::DisplayRole).toString();
+    }
+
+    ErrorOr<void> get_search_suggestions(StringView);
+    void clear_suggestions();
+    static ErrorOr<String> search_url_from_query(StringView query);
+    static ErrorOr<String> auto_complete_url_from_query(StringView query);
+
+signals:
+    void activated(QModelIndex const&);
+
+private:
+    ErrorOr<void> got_network_response(QNetworkReply* reply);
+
+    ErrorOr<void> parse_google_autocomplete(Vector<JsonValue> const&);
+    ErrorOr<void> parse_duckduckgo_autocomplete(Vector<JsonValue> const&);
+    ErrorOr<void> parse_yahoo_autocomplete(JsonObject const&);
+
+    QNetworkAccessManager* m_manager;
+    AutoCompleteModel* m_auto_complete_model;
+    QTreeView* m_tree_view;
+    QNetworkReply* m_reply { nullptr };
+
+    String m_query;
+};
+
+}