Implement dropping music files from file manager onto Playlist

BUG: 404712
FIXED-IN: 22.04

src/elisaapplication.cpp

@@ -55,6 +55,8 @@
 #include <QKeyEvent>
 #include <QDebug>
 #include <QFileSystemWatcher>
+#include <QMimeDatabase>
+#include <QMimeType>
 
 #include <memory>
 
@@ -238,6 +240,24 @@ void ElisaApplication::setArguments(const DataTypes::EntryDataList &newArguments
     }
 }
 
+void ElisaApplication::openFiles(const QList<QUrl> &files)
+{
+    auto newArguments = DataTypes::EntryDataList{};
+    const QMimeDatabase mimeDB;
+    for (const auto &file : files) {
+        const QMimeType mime = mimeDB.mimeTypeForUrl(file);
+        if (mime.inherits(QStringLiteral("audio/x-mpegurl"))) {
+            d->mMediaPlayListProxyModel->loadPlayList(file);
+        } else if (mime.name().startsWith(QStringLiteral("audio/"))) {
+            newArguments.push_back(DataTypes::EntryData{{{DataTypes::ElementTypeRole, ElisaUtils::FileName},
+                            {DataTypes::ResourceRole, file}}, {}, {}});
+        }
+    }
+    setArguments(newArguments);
+    // so that adding the same file more than once works
+    setArguments({});
+}
+
 void ElisaApplication::activateActionRequested(const QString &actionName, const QVariant &parameter)
 {
     Q_UNUSED(actionName)

src/elisaapplication.h

@@ -197,6 +197,8 @@ public Q_SLOTS:
 
     void setArguments(const DataTypes::EntryDataList &newArguments);
 
+    void openFiles(const QList<QUrl> &files);
+
     void activateActionRequested(const QString &actionName, const QVariant &parameter);
 
     void activateRequested(const QStringList &arguments, const QString &workingDirectory);

src/qml/ElisaMainWindow.qml

@@ -38,6 +38,15 @@ Kirigami.ApplicationWindow {
         }
     }
 
+    DropArea {
+        anchors.fill: parent
+        onDropped: {
+            if (drop.hasUrls) {
+                ElisaApplication.openFiles(drop.urls);
+            }
+        }
+    }
+
     // HACK: since elisa's main view hasn't been ported to a page, but page layers are used for mobile settings
     // lower the main view and mobile footer's z to be behind the layer when there are layers added (normally it is in front)
     property bool layerOnTop: pageStack.layers.depth > 1