make path inputs support drag/dropping files onto them to add the path quickly. fixes #1033

src/frontend/qt_sdl/QPathInput.h

@@ -0,0 +1,66 @@
+/*
+    Copyright 2016-2021 Arisotura
+
+    This file is part of melonDS.
+
+    melonDS is free software: you can redistribute it and/or modify it under
+    the terms of the GNU General Public License as published by the Free
+    Software Foundation, either version 3 of the License, or (at your option)
+    any later version.
+
+    melonDS is distributed in the hope that it will be useful, but WITHOUT ANY
+    WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
+    FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.
+
+    You should have received a copy of the GNU General Public License along
+    with melonDS. If not, see http://www.gnu.org/licenses/.
+*/
+
+#ifndef QPATHINPUT_H
+#define QPATHINPUT_H
+
+#include <QLineEdit>
+#include <QDragEnterEvent>
+#include <QDropEvent>
+#include <QMimeData>
+
+class QPathInput : public QLineEdit
+{
+    Q_OBJECT
+
+public:
+    QPathInput(QWidget* parent = nullptr) : QLineEdit(parent)
+    {
+        setAcceptDrops(true);
+    }
+
+    ~QPathInput()
+    {
+    }
+
+protected:
+    void dragEnterEvent(QDragEnterEvent* event) override
+    {
+        if (!event->mimeData()->hasUrls()) return QLineEdit::dragEnterEvent(event);
+
+        QList<QUrl> urls = event->mimeData()->urls();
+        if (urls.count() > 1) return QLineEdit::dragEnterEvent(event);
+
+        QString filename = urls.at(0).toLocalFile();
+
+        event->acceptProposedAction();
+    }
+
+    void dropEvent(QDropEvent* event) override
+    {
+        if (!event->mimeData()->hasUrls()) return QLineEdit::dropEvent(event);
+
+        QList<QUrl> urls = event->mimeData()->urls();
+        if (urls.count() > 1) return QLineEdit::dropEvent(event);
+
+        QString filename = urls.at(0).toLocalFile();
+        setText(filename);
+    }
+};
+
+#endif // QPATHINPUT_H