From 35c7c33c23685e00bc981a3809a3f3a3597c2f9a Mon Sep 17 00:00:00 2001
From: Simon Rettberg
Date: Mon, 6 Mar 2017 16:01:30 +0100
Subject: [server] Prevent screen standby while clients are connected

---
 src/server/mainwindow/mainwindow.cpp | 35 ++++++++++++++++++++++-------------
 1 file changed, 22 insertions(+), 13 deletions(-)

(limited to 'src/server/mainwindow/mainwindow.cpp')

diff --git a/src/server/mainwindow/mainwindow.cpp b/src/server/mainwindow/mainwindow.cpp
index 0a77240..a984173 100644
--- a/src/server/mainwindow/mainwindow.cpp
+++ b/src/server/mainwindow/mainwindow.cpp
@@ -35,6 +35,7 @@
 #include "../net/filedownloader.h"
 // Others
 #include "../../shared/settings.h"
+#include "../util/platform/screensaver.h"
 // Auto-generated ui class
 #include "ui_mainwindow.h"
 #include "ui_reloadroom.h"
@@ -62,7 +63,8 @@ using std::endl;
  * @param parent
  */
 MainWindow::MainWindow(QWidget* parent) :
-	QMainWindow(parent), ui(new Ui::MainWindow), _tbIconSize(24), _tbArea(Qt::LeftToolBarArea)
+	QMainWindow(parent), ui(new Ui::MainWindow), _tbIconSize(24), _tbArea(Qt::LeftToolBarArea),
+	_lastClientCount(0)
 {
 	qDebug() << "MainWindow(parent)";
 	_mode = Mode::Multicast;
@@ -108,7 +110,7 @@ MainWindow::MainWindow(QWidget* parent) :
 	ui->toolBar->insertWidget(ui->action_TutorToStudent, _examModeLabel);
 
 	serverApp->setExam(false);
-	updateExamMode();
+	clientCountChanged();
 
 	// Close button in tool bar
 	connect(ui->action_Exit, SIGNAL(triggered()), this, SLOT(onButtonExit()));
@@ -181,22 +183,22 @@ MainWindow::MainWindow(QWidget* parent) :
 /** this function determines if the number of clients in exam mode comprise
 * more than 50%. In that case the whole manager switches to exam mode,
 * disabling many features in the toolbar **/
-void MainWindow::updateExamMode()
+void MainWindow::clientCountChanged()
 {
-	int numerator = 0;
-	int denominator = 0;
+	int examClientCount = 0;
+	int clientCount = 0;
 
 
 	for (auto it = _clientFrames.begin(); it != _clientFrames.end(); ++it) {
 		Client* c = (*it)->client();
 		if (c != NULL) {
 			bool b = c->isExamMode();
-			numerator += b ? 1 : 0;
-			denominator++;
+			examClientCount += b ? 1 : 0;
+			clientCount++;
 		}
 	}
 
-	serverApp->setExam(numerator * 2 >= denominator && denominator > 0);
+	serverApp->setExam(examClientCount * 2 >= clientCount && clientCount > 0);
 	bool e = serverApp->isExam();
 	qDebug() << "isExam is " << e;
 	ui->action_TutorToAll->setVisible(!e);
@@ -207,8 +209,15 @@ void MainWindow::updateExamMode()
 	_examModeLabel->setVisible(e);
 	_examModeLabel->setFixedHeight(e ? 400 : 0);
 
-
-
+	if (_lastClientCount != clientCount) {
+		if (clientCount == 0) {
+			ScreenSaver::allowSaverAndStandby(true);
+		} else {
+			ScreenSaver::forceUnlockAndScreenOn();
+			ScreenSaver::allowSaverAndStandby(false);
+		}
+		_lastClientCount = clientCount;
+	}
 }
 
 MainWindow::~MainWindow()
@@ -1149,7 +1158,7 @@ void MainWindow::onClientAuthenticated(Client* client)
 		// qDebug() << "Should go into this if clause.";
 		existing->assignClient(client);
 		tellClientCurrentSituation(client);
-		updateExamMode();
+		clientCountChanged();
 		return;
 	}
 
@@ -1160,7 +1169,7 @@ void MainWindow::onClientAuthenticated(Client* client)
 
 	//resizeEvent(NULL); // This is where all the positioning should be
 	tellClientCurrentSituation(client);
-	updateExamMode();
+	clientCountChanged();
 
 }
 
@@ -1294,7 +1303,7 @@ void MainWindow::onDeleteClient()
 			frame->deleteLater();
 			_clientFrames.removeOne(frame);
 			lockContextButtons();
-			updateExamMode();
+			clientCountChanged();
 			return;
 		}
 	}
-- 
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