Add message for invalid drag. Split & clean code.

1 files changed, 92 insertions, 0 deletions

diff --git a/src/modlistdropinfo.h b/src/modlistdropinfo.h
new file mode 100644
index 00000000..14a21691
--- /dev/null
+++ b/src/modlistdropinfo.h
@@ -0,0 +1,92 @@
+#ifndef MODLISTDROPINFO_H
+#define MODLISTDROPINFO_H
+
+#include <optional>
+#include <vector>
+
+#include <QMimeData>
+#include <QString>
+#include <QUrl>
+
+class OrganizerCore;
+
+// small class that extract information from mimeData
+//
+class ModListDropInfo {
+public:
+
+  // text value for the mime-data for the various possible
+  // origin (not for external drops)
+  //
+  static constexpr const char* MOD_TEXT = "mod";
+  static constexpr const char* DOWNLOAD_TEXT = "download";
+
+public:
+
+  struct RelativeUrl {
+    const QUrl url;
+    const QString relativePath;
+    const QString originName;
+  };
+
+public:
+
+  ModListDropInfo(const QMimeData* mimeData, OrganizerCore& core);
+
+  // returns true if this drop is valid
+  //
+  bool isValid() const;
+
+  // returns true if these data corresponds to drag&drop
+  // of local files (e.g. from overwrite)
+  //
+  bool isLocalFileDrop() const;
+
+  // returns true if these data corresponds to drag&drop
+  // of mod in the list
+  //
+  bool isModDrop() const;
+
+  // returns true if these data corresponds to drag&drop
+  // from the download list
+  //
+  bool isDownloadDrop() const;
+
+  // returns true if these data corresponds to dropping
+  // an archive for installation
+  //
+  bool isExternalArchiveDrop() const;
+
+  // returns true if these data corresponds to dropping
+  // a folder for copy
+  //
+  bool isExternalFolderDrop() const;
+
+  const auto& rows() const { return m_rows; }
+  const auto& download() const { return m_download; }
+  const auto& localUrls() const { return m_localUrls; }
+  const auto& externalUrl() const { return m_url; }
+
+private:
+
+  friend class ModList;
+
+  // retrieve the relative path of file and its origin given a URL from Mime data
+  // returns an empty optional if the URL is not a valid file for dropping
+  //
+  std::optional<RelativeUrl> relativeUrl(const QUrl&) const;
+
+private:
+
+  // rows for drag&drop between views
+  std::vector<int> m_rows;
+  int m_download; // -1 if invalid
+
+  // local URLs from the data (relative path + origin name)
+  std::vector<RelativeUrl> m_localUrls;
+
+  // external URL
+  QUrl m_url;
+};
+
+#endif