Moved everything associated with executing and explaining queries to querytab.

It is now possible to create multiple independent query tabs. However
somethings are currently a bit broken.

querytab.h

@@ -1,22 +1,73 @@
-#ifndef QUERYTAB_H
+#ifndef QUERYTAB_H
 #define QUERYTAB_H
 
+#include "asyncdbconnection.h"
+#include "QueryResultModel.h"
+#include "QueryExplainModel.h"
+
 #include <QWidget>
+#include <memory>
 
 namespace Ui {
 class QueryTab;
 }
 
+class MainWindow;
+class SqlHighlighter;
+class ExplainRoot;
+class QueryResultModel;
+class QueryExplainModel;
+
+
 class QueryTab : public QWidget
 {
 	Q_OBJECT
 
 public:
-	explicit QueryTab(QWidget *parent = 0);
+	QueryTab(MainWindow *win, QWidget *parent = 0);
 	~QueryTab();
 
+	void setConfig(const ConnectionConfig &config);
+
+	void open();
+	void save();
+	void saveAs();
+	void saveCopyAs();
+
+	void execute();
+	void explainAnalyze();
+	void cancel();
 private:
 	Ui::QueryTab *ui;
+	MainWindow *m_win;
+	std::unique_ptr<SqlHighlighter> highlighter;
+	ConnectionConfig m_config;
+
+	QString m_fileName; ///< use setFileName function to set
+	bool m_queryTextChanged = false;
+
+	void setFileName(const QString &filename);
+	bool continueWithoutSavingWarning();
+	void saveSqlTo(const QString &filename);
+	QString promptUserForSaveSqlFilename();
+
+
+	ASyncDBConnection m_dbConnection;
+	std::unique_ptr<QueryResultModel> resultModel;
+	std::unique_ptr<QueryExplainModel> explainModel;
+
+	void addLog(QString s);
+
+	std::string getCommand() const;
+	void explain_ready(ExplainRoot::SPtr explain);
+	void query_ready(std::shared_ptr<Pgsql::Result> dbres);
+private slots:
+
+	void queryTextChanged();
+	void connectionStateChanged(ASyncDBConnection::State state);
+	void receiveNotice(Pgsql::ErrorDetails notice);
+
+	void startConnect();
 };
 
 #endif // QUERYTAB_H