[PATCH] Add support for remembering settings

[amit.k.chaudhuri at gmail.com]

From: Amit Chaudhuri <amit.k.chaudhuri at gmail.com>

Use QSettings to provide persistent storage of settings. For example, we
store and restore the size of the MainWindow.

We use the organisation name hohndel.org and keep subsurface as the
application name.

A section is specified for things to do with the MainWindow; other
sections could be added e.g. for preferred units?

Signed-off-by: Amit Chaudhuri <amit.k.chaudhuri at gmail.com>
---
 qt-ui/mainwindow.cpp |   37 +++++++++++++++++++++++++++++++++++++
 qt-ui/mainwindow.h   |    5 +++++
 2 files changed, 42 insertions(+)

diff --git a/qt-ui/mainwindow.cpp b/qt-ui/mainwindow.cpp
index 8cdc601..0c6691a 100644
--- a/qt-ui/mainwindow.cpp
+++ b/qt-ui/mainwindow.cpp
@@ -12,6 +12,8 @@
 #include <QtDebug>
 #include <QDateTime>
 #include <QSortFilterProxyModel>
+#include <QSettings>
+#include <QCloseEvent>
 
 #include "divelistview.h"
 #include "starwidget.h"
@@ -31,6 +33,7 @@ MainWindow::MainWindow() : ui(new Ui::MainWindow()),
 	ui->ListWidget->setModel(sortModel);
 
 	setWindowIcon(QIcon(":subsurface-icon"));
+	readSettings();
 }
 
 void MainWindow::on_actionNew_triggered()
@@ -138,6 +141,11 @@ void MainWindow::on_actionPreferences_triggered()
 void MainWindow::on_actionQuit_triggered()
 {
 	qDebug("actionQuit");
+	if (unsaved_changes() && (askSaveChanges() == FALSE))
+	{
+		return;
+	}
+
 }
 
 void MainWindow::on_actionDownloadDC_triggered()
@@ -284,3 +292,32 @@ bool MainWindow::askSaveChanges()
 	}
 	return false;
 }
+
+void MainWindow::readSettings()
+{
+	QSettings settings("hohndel.org","subsurface");
+
+	/* note: section/key i.e. forward slash to separate */
+	QSize sz = settings.value("MainWindow/size").value<QSize>();
+	resize(sz);
+}
+
+void MainWindow::writeSettings()
+{
+	QSettings settings("hohndel.org","subsurface");
+	settings.beginGroup("MainWindow");
+	settings.setValue("size",size());
+	settings.endGroup();
+	/* other groups here; avoid '/' and '\' in keys with setValue(...) please */
+}
+
+void MainWindow::closeEvent(QCloseEvent *event)
+{
+	if (unsaved_changes() && (askSaveChanges() == FALSE))
+	{
+		event->ignore();
+		return;
+	}
+	event->accept();
+	writeSettings();
+}
\ No newline at end of file
diff --git a/qt-ui/mainwindow.h b/qt-ui/mainwindow.h
index fdb100c..eece91a 100644
--- a/qt-ui/mainwindow.h
+++ b/qt-ui/mainwindow.h
@@ -66,12 +66,17 @@ private Q_SLOTS:
 	void on_actionAboutSubsurface_triggered();
 	void on_actionUserManual_triggered();
 
+protected:
+	void closeEvent(QCloseEvent *);
+
 private:
 	Ui::MainWindow *ui;
 	DiveTripModel *model;
 	QSortFilterProxyModel *sortModel;
 	QString filter();
 	bool askSaveChanges();
+	void readSettings();
+	void writeSettings();
 
 };
 
-- 
1.7.10.4