Implement the registerApplicationState function

This function registers the different widget layouts
that we will have in subsurface. Currently we have three layouts
(default, plan, add) and a few more are comming (for instance
location) and the code is scattered around. It was making me
unconfortable.

Signed-off-by: Tomaz Canabrava <tomaz.canabrava@intel.com>
Signed-off-by: Dirk Hohndel <dirk@hohndel.org>

qt-ui/mainwindow.cpp

@@ -1485,3 +1485,8 @@ void MainWindow::checkForUndoAndRedo()
 	ui.action_Undo->setEnabled(undoBuffer->canUndo());
 	ui.action_Redo->setEnabled(undoBuffer->canRedo());
 }
+
+void registerApplicationState(const QByteArray& state, QWidget *topLeft, QWidget *bottomLeft, QWidget *topRight, QWidget *bottomRight)
+{
+	applicationState[state] = WidgetForBorder(topLeft, bottomLeft, topRight, bottomRight);
+}

qt-ui/mainwindow.h

@@ -190,6 +190,7 @@ private:
 	void saveSplitterSizes();
 	QString lastUsedDir();
 	void updateLastUsedDir(const QString &s);
+	void registerApplicationState(const QByteArray& state, QWidget *topLeft, QWidget *bottomLeft, QWidget *topRight, QWidget *bottomRight);
 	bool filesAsArguments;
 	UpdateManager *updateManager;
 
@@ -201,6 +202,8 @@ private:
 	QList<QAction *> profileToolbarActions;
 
 	struct WidgetForBorder {
+		WidgetForBorder(QWidget *tl, QWidget *bl, QWidget *tr, QWidget *br) :
+			topLeft(tl), bottomLeft(bl), topRight(tr), bottomRight(br) {}
 		QWidget *topLeft;
 		QWidget *bottomLeft;
 		QWidget *topRight;