add user search to invite dialog (#1253)

src/UserDirectoryModel.h

@@ -0,0 +1,69 @@
+// SPDX-FileCopyrightText: 2021 Nheko Contributors
+// SPDX-FileCopyrightText: 2022 Nheko Contributors
+// SPDX-FileCopyrightText: 2023 Nheko Contributors
+//
+// SPDX-License-Identifier: GPL-3.0-or-later
+
+#pragma once
+
+#include <QAbstractListModel>
+#include <QString>
+#include <string>
+#include <vector>
+
+#include <mtx/responses/users.hpp>
+
+class FetchUsersFromDirectoryJob final : public QObject
+{
+    Q_OBJECT
+public:
+    explicit FetchUsersFromDirectoryJob(QObject *p = nullptr)
+    : QObject(p)
+    {
+    }
+signals:
+    void fetchedSearchResults(std::vector<mtx::responses::User> results, const std::string &searchTerm);
+};
+class UserDirectoryModel : public QAbstractListModel
+{
+    Q_OBJECT
+
+    Q_PROPERTY(bool searchingUsers READ searchingUsers NOTIFY searchingUsersChanged)
+
+public:
+    explicit UserDirectoryModel(QObject *parent = nullptr);
+
+    enum Roles
+    {
+        DisplayName,
+        Mxid,
+        AvatarUrl,
+    };
+    QHash<int, QByteArray> roleNames() const override;
+
+    QVariant data(const QModelIndex &index, int role) const override;
+
+    inline int rowCount(const QModelIndex &parent = QModelIndex()) const override
+    {
+        (void)parent;
+        return static_cast<int>(results_.size());
+    }
+    bool canFetchMore(const QModelIndex &) const override { return canFetchMore_; }
+    void fetchMore(const QModelIndex &) override;
+
+private:
+    std::vector<mtx::responses::User> results_;
+    std::string userSearchString_;
+    bool searchingUsers_{false};
+    bool canFetchMore_{false};
+
+signals:
+    void searchingUsersChanged();
+
+public slots:
+    void setSearchString(const QString &f);
+    bool searchingUsers() const { return searchingUsers_; }
+
+private slots:
+    void displaySearchResults(std::vector<mtx::responses::User> results, const std::string &searchTerm);
+};