Implement drag&drop support in main form to open database files

src/gui/MainWindow.cpp

@@ -114,6 +114,8 @@ MainWindow::MainWindow()
 {
     m_ui->setupUi(this);
 
+    setAcceptDrops(true);
+
     m_ui->toolBar->setContextMenuPolicy(Qt::PreventContextMenu);
 
     // Setup the search widget in the toolbar
@@ -997,3 +999,39 @@ void MainWindow::handleScreenLock()
         lockDatabasesAfterInactivity();
     }
 }
+
+QStringList MainWindow::kdbxFilesFromUrls(const QList<QUrl>& urls)
+{
+    QStringList kdbxFiles;
+    for (const QUrl& url: urls) {
+        const QFileInfo fInfo(url.toLocalFile());
+        const bool isKdbxFile = fInfo.isFile() && fInfo.suffix().toLower() == "kdbx";
+        if (isKdbxFile) {
+            kdbxFiles.append(fInfo.absoluteFilePath());
+        }
+    }
+
+    return kdbxFiles;
+}
+
+void MainWindow::dragEnterEvent(QDragEnterEvent* event)
+{
+    const QMimeData* mimeData = event->mimeData();
+    if (mimeData->hasUrls()) {
+        const QStringList kdbxFiles = kdbxFilesFromUrls(mimeData->urls());
+        if (!kdbxFiles.isEmpty()) {
+            event->acceptProposedAction();
+        }
+    }
+}
+
+void MainWindow::dropEvent(QDropEvent* event)
+{
+    const QMimeData* mimeData = event->mimeData();
+    if (mimeData->hasUrls()) {
+        const QStringList kdbxFiles = kdbxFilesFromUrls(mimeData->urls());
+        for(const QString &kdbxFile: kdbxFiles) {
+            openDatabase(kdbxFile);
+        }
+    }
+}

src/gui/MainWindow.h

@@ -107,6 +107,10 @@ private:
     void updateTrayIcon();
     bool isTrayIconEnabled() const;
 
+    static QStringList kdbxFilesFromUrls(const QList<QUrl>& urls);
+    void dragEnterEvent(QDragEnterEvent* event) override;
+    void dropEvent(QDropEvent* event) override;
+
     const QScopedPointer<Ui::MainWindow> m_ui;
     SignalMultiplexer m_actionMultiplexer;
     QAction* m_clearHistoryAction;