cache: better implemented changing disk cache folders

Not complete yet, but getting there.

app/widget/path/pathwidget.h

@@ -0,0 +1,57 @@
+/***
+
+  Olive - Non-Linear Video Editor
+  Copyright (C) 2019 Olive Team
+
+  This program 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.
+
+  This program 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 this program.  If not, see <http://www.gnu.org/licenses/>.
+
+***/
+
+#ifndef PATHWIDGET_H
+#define PATHWIDGET_H
+
+#include <QLineEdit>
+#include <QPushButton>
+
+#include "common/define.h"
+
+OLIVE_NAMESPACE_ENTER
+
+class PathWidget : public QWidget
+{
+  Q_OBJECT
+public:
+  PathWidget(const QString& path,
+             QWidget* parent = nullptr);
+
+  QString text() const
+  {
+    return path_edit_->text();
+  }
+
+private slots:
+  void BrowseClicked();
+
+  void LineEditChanged();
+
+private:
+  QLineEdit* path_edit_;
+
+  QPushButton* browse_btn_;
+
+};
+
+OLIVE_NAMESPACE_EXIT
+
+#endif // PATHWIDGET_H