map: add placeholder .cpp and .h files for the new map widget

The files are WIP and located in desktop-widgets, as these
would only be used by the desktop version.

Signed-off-by: Lubomir I. Ivanov <neolit123@gmail.com>

desktop-widgets/mapwidget.cpp

@@ -0,0 +1,27 @@
+#include <QQmlContext>
+#include <QDebug>
+#include <QQuickItem>
+
+#include "mapwidget.h"
+
+MapWidget *MapWidget::m_instance = NULL;
+
+MapWidget::MapWidget(QWidget *parent) : QQuickWidget(parent)
+{
+	setSource(QUrl(QStringLiteral("qrc:/mapwidget-qml")));
+	setResizeMode(QQuickWidget::SizeRootObjectToView);
+
+	m_rootItem = qobject_cast<QQuickItem *>(rootObject());
+}
+
+MapWidget::~MapWidget()
+{
+	m_instance = NULL;
+}
+
+MapWidget *MapWidget::instance()
+{
+	if (m_instance == NULL)
+		m_instance = new MapWidget();
+	return m_instance;
+}

desktop-widgets/mapwidget.h

@@ -0,0 +1,23 @@
+#ifndef MAPWIDGET_H
+#define MAPWIDGET_H
+
+#include <QQuickWidget>
+
+class QResizeEvent;
+class QQuickItem;
+
+class MapWidget : public QQuickWidget {
+
+public:
+	MapWidget(QWidget *parent = NULL);
+	~MapWidget();
+
+	static MapWidget *instance();
+
+private:
+	static MapWidget *m_instance;
+	QQuickItem *m_rootItem;
+
+};
+
+#endif // MAPWIDGET_H