Add unread count

Signed-off-by: Carl Schwan <carl@carlschwan.eu>

src/mail/CMakeLists.txt

@@ -10,6 +10,8 @@ target_sources(kalendar_mail_plugin PUBLIC
     mailmanager.h
     mailmodel.cpp
     mailmodel.h
+    helper.h
+    helper.cpp
 
     messagestatus.h
     messagestatus.cpp

src/mail/helper.cpp

+// SPDX-FileCopyrightText: 2022 Carl Schwan <carlschwan@kde.org>
+// SPDX-License-Identifier: LGPL-2.0-or-later
+
+#include "helper.h"
+
+#include <Akonadi/CollectionStatistics>
+
+qint64 MailCollectionHelper::unreadCount(const Akonadi::Collection &collection)
+{
+    return collection.statistics().unreadCount();
+}

src/mail/helper.h

+// SPDX-FileCopyrightText: 2022 Carl Schwan <carlschwan@kde.org>
+// SPDX-License-Identifier: LGPL-2.0-or-later
+
+#include <Akonadi/Collection>
+#include <QObject>
+
+class MailCollectionHelper : public QObject
+{
+    Q_OBJECT
+
+public:
+    Q_INVOKABLE qint64 unreadCount(const Akonadi::Collection &collection);
+};

src/mail/mailplugin.cpp

@@ -7,6 +7,7 @@
 #include <QQmlEngine>
 #include <QtQml>
 
+#include "helper.h"
 #include "mailmanager.h"
 #include "mailmodel.h"
 #include "mime/htmlutils.h"
@@ -28,6 +29,12 @@ void CalendarPlugin::registerTypes(const char *uri)
         return new HtmlUtils::HtmlUtils;
     });
 
+    qmlRegisterSingletonType<MailCollectionHelper>("org.kde.kalendar.mail", 1, 0, "MailCollectionHelper", [](QQmlEngine *engine, QJSEngine *scriptEngine) {
+        Q_UNUSED(engine)
+        Q_UNUSED(scriptEngine)
+        return new MailCollectionHelper;
+    });
+
     qmlRegisterType<MessageParser>(uri, 1, 0, "MessageParser");
 
     qRegisterMetaType<MailModel *>("MailModel*");

src/mail/qml/mailboxselector/MailBoxList.qml

@@ -152,6 +152,23 @@ ListView {
                         Layout.alignment: Qt.AlignLeft
                         Layout.fillWidth: true
                     }
+
+                    QQC2.Label {
+                        property int unreadCount: MailCollectionHelper.unreadCount(model.collection)
+                        text: unreadCount
+                        visible: unreadCount > 0
+                        padding: Kirigami.Units.smallSpacing
+                        color: Kirigami.Theme.textColor
+                        Layout.minimumWidth: height
+                        horizontalAlignment: Text.AlignHCenter
+                        background: Rectangle {
+                            visible: unreadCount > 0
+                            Kirigami.Theme.colorSet: Kirigami.Theme.Button
+                            color: Kirigami.Theme.disabledTextColor
+                            opacity: 0.3
+                            radius: height / 2
+                        }
+                    }
                 }
 
                 onClicked: {