Add FileType singleton

This singleton is used to get the mimetype info for files as well as supported formats for Images and AnimatedImages

src/filetypesingleton.h

@@ -0,0 +1,63 @@
+/* SPDX-FileCopyrightText: 2015 Klaralvdalens Datakonsult AB
+ * SPDX-FileCopyrightText: 2016 The Qt Company Ltd.
+ * SPDX-FileCopyrightText: 2021 Noah Davis <noahadvs@gmail.com>
+ * SPDX-License-Identifier: LicenseRef-KDE-Accepted-LGPL
+ */
+
+#ifndef FILETYPESINGLETON_H
+#define FILETYPESINGLETON_H
+
+#include <QObject>
+#include <qqml.h>
+#include <QMimeDatabase>
+
+class FileTypeSingletonPrivate;
+
+class FileTypeSingleton : public QObject
+{
+    Q_OBJECT
+    Q_PROPERTY(QStringList supportedImageFormats READ supportedImageFormats CONSTANT FINAL)
+    Q_PROPERTY(QStringList supportedAnimatedImageFormats READ supportedAnimatedImageFormats CONSTANT FINAL)
+    QML_NAMED_ELEMENT(FileType)
+    QML_SINGLETON
+
+public:
+    explicit FileTypeSingleton(QObject *parent = nullptr);
+    ~FileTypeSingleton();
+
+    // Most of the code in this public section was copy/pasted from qmimedatabase.h
+    Q_INVOKABLE QMimeType mimeTypeForName(const QString &nameOrAlias) const;
+
+    enum MatchMode {
+        MatchDefault,
+        MatchExtension,
+        MatchContent
+    };
+    Q_ENUM(MatchMode)
+
+    Q_INVOKABLE QMimeType mimeTypeForFile(const QString &fileName, MatchMode mode = MatchDefault) const;
+    Q_INVOKABLE QMimeType mimeTypeForFile(const QFileInfo &fileInfo, MatchMode mode = MatchDefault) const;
+    Q_INVOKABLE QList<QMimeType> mimeTypesForFileName(const QString &fileName) const;
+
+    Q_INVOKABLE QMimeType mimeTypeForData(const QByteArray &data) const;
+    Q_INVOKABLE QMimeType mimeTypeForData(QIODevice *device) const;
+
+    Q_INVOKABLE QMimeType mimeTypeForUrl(const QUrl &url) const;
+    Q_INVOKABLE QMimeType mimeTypeForFileNameAndData(const QString &fileName, QIODevice *device) const;
+    Q_INVOKABLE QMimeType mimeTypeForFileNameAndData(const QString &fileName, const QByteArray &data) const;
+
+    Q_INVOKABLE QString suffixForFileName(const QString &fileName) const;
+
+    // These return a list of file extentions, not mimetypes
+    QStringList supportedImageFormats() const;
+    QStringList supportedAnimatedImageFormats() const;
+
+private:
+    const QScopedPointer<FileTypeSingletonPrivate> d_ptr;
+    Q_DECLARE_PRIVATE(FileTypeSingleton)
+    Q_DISABLE_COPY(FileTypeSingleton)
+};
+
+QML_DECLARE_TYPE(FileTypeSingleton)
+
+#endif // MIMETYPESINGLETON_H