Add drag and drop support.

imports/Spectral/Panel/RoomPanel.qml

@@ -23,6 +23,18 @@ Item {
         room: currentRoom
     }
 
+    DropArea {
+        anchors.fill: parent
+
+        enabled: currentRoom
+
+        onDropped: {
+            if (!drop.hasUrls) return
+
+            currentRoom.uploadFile(drop.urls[0])
+        }
+    }
+
     Column {
         anchors.centerIn: parent
 

src/spectralroom.cpp

@@ -47,7 +47,15 @@ inline QSize getImageSize(const QUrl& imageUrl) {
 void SpectralRoom::chooseAndUploadFile() {
   auto localFile = QFileDialog::getOpenFileUrl(Q_NULLPTR, tr("Save File as"));
   if (!localFile.isEmpty()) {
-    QString txnID = postFile(localFile.fileName(), localFile, false);
+    uploadFile(localFile);
+  }
+}
+
+void SpectralRoom::uploadFile(const QUrl& url) {
+  if (url.isEmpty())
+    return;
+
+  QString txnID = postFile(url.fileName(), url, false);
   setHasFileUploading(true);
   connect(this, &Room::fileTransferCompleted,
           [=](QString id, QUrl localFile, QUrl mxcUrl) {
@@ -70,7 +78,6 @@ void SpectralRoom::chooseAndUploadFile() {
           setFileUploadingProgress(int(float(progress) / float(total) * 100));
         }
       });
-  }
 }
 
 void SpectralRoom::acceptInvitation() {

src/spectralroom.h

@@ -255,6 +255,7 @@ class SpectralRoom : public Room {
 
  public slots:
   void chooseAndUploadFile();
+  void uploadFile(const QUrl& url);
   void acceptInvitation();
   void forget();
   void sendTypingNotification(bool isTyping);