From a1b07fe204eedb3e311fa81e9a348f8417f97db7 Mon Sep 17 00:00:00 2001
From: Michael Zanetti <michael_zanetti@gmx.net>
Date: Sun, 21 Mar 2021 17:18:44 +0100
Subject: [PATCH] Improve screen brightness control

---
 .../generic/screenhelper.cpp                  | 62 ++++++++++++++-----
 .../generic/screenhelper.h                    |  4 ++
 .../debian/nymea-app-kiosk-wayland.postinst   | 17 +++++
 3 files changed, 67 insertions(+), 16 deletions(-)
 create mode 100644 packaging/ubuntu/debian/nymea-app-kiosk-wayland.postinst

diff --git a/nymea-app/platformintegration/generic/screenhelper.cpp b/nymea-app/platformintegration/generic/screenhelper.cpp
index 2e99c0de..96b234a9 100644
--- a/nymea-app/platformintegration/generic/screenhelper.cpp
+++ b/nymea-app/platformintegration/generic/screenhelper.cpp
@@ -90,12 +90,20 @@ ScreenHelper::ScreenHelper(QObject *parent) : QObject(parent)
     }
 
     QSettings settings;
-    m_screenOffTimer.setInterval(settings.value("screenOffTimeout", 15000).toInt());
+
+    m_currentBrightness = settings.value("screenBrightness", 80).toInt();
+
+
+    m_screenDimTimer.setInterval(settings.value("screenOffTimeout", 30000).toInt());
+    m_screenDimTimer.setSingleShot(true);
+    connect(&m_screenDimTimer, &QTimer::timeout, this, &ScreenHelper::dimScreen);
+    if (m_screenDimTimer.interval() > 0) {
+        m_screenDimTimer.start();
+    }
+
+    m_screenOffTimer.setInterval(5000);
     m_screenOffTimer.setSingleShot(true);
     connect(&m_screenOffTimer, &QTimer::timeout, this, &ScreenHelper::screenOff);
-    if (m_screenOffTimer.interval() > 0) {
-        m_screenOffTimer.start();
-    }
 
     // Hide the mouse cursor right away, it'll be restored on mouse move events
     QApplication::setOverrideCursor(Qt::BlankCursor);
@@ -109,18 +117,18 @@ bool ScreenHelper::active() const
 
 int ScreenHelper::screenTimeout() const
 {
-    return m_screenOffTimer.interval();
+    return m_screenDimTimer.interval();
 }
 
 void ScreenHelper::setScreenTimeout(int timeout)
 {
-    m_screenOffTimer.setInterval(timeout);
+    m_screenDimTimer.setInterval(timeout);
     QSettings settings;
     settings.setValue("screenOffTimeout", timeout);
     if (timeout > 0) {
-        m_screenOffTimer.start();
+        m_screenDimTimer.start();
     } else {
-        m_screenOffTimer.stop();
+        m_screenDimTimer.stop();
     }
 }
 
@@ -131,9 +139,10 @@ int ScreenHelper::screenBrightness() const
 
 void ScreenHelper::setScreenBrightness(int percent)
 {
+    QSettings settings;
+    settings.setValue("screenBrightness", percent);
     m_currentBrightness = percent;
-    m_brightnessFile.write(QString("%1\n").arg(percent * m_maxBrightness / 100).toUtf8());
-    m_brightnessFile.flush();
+    applyBrightness(m_currentBrightness);
 }
 
 bool ScreenHelper::eventFilter(QObject *watched, QEvent *event)
@@ -181,20 +190,26 @@ bool ScreenHelper::eventFilter(QObject *watched, QEvent *event)
         m_cursorHidden = false;
     }
 
-
-    if (!m_screenOffTimer.isActive()) {
+    // No timer is active, means we've off already => turn on and start dim timer, eating the input event
+    if (!m_screenDimTimer.isActive() && !m_screenOffTimer.isActive()) {
         screenOn();
-        m_screenOffTimer.start();
+        m_screenDimTimer.start();
         return true;
     }
-    m_screenOffTimer.start( );
+    // Screen off timer is active, means we've dimmed down already => dim up again and stop offTimer
+    if (m_screenOffTimer.isActive()) {
+        m_screenOffTimer.stop();
+        applyBrightness(m_currentBrightness);
+    }
+    // restart dim timer
+    m_screenDimTimer.start();
     return QObject::eventFilter(watched, event);
 }
 
 void ScreenHelper::screenOn()
 {
     qCInfo(dcPlatformIntegration()) << "Turning screen on";
-    int ret = m_powerFile.write("0\n");
+    qint64 ret = m_powerFile.write("0\n");
     m_powerFile.flush();
     if (ret < 0) {
         qCWarning(dcPlatformIntegration()) << "Failed to power on screen";
@@ -204,9 +219,24 @@ void ScreenHelper::screenOn()
 void ScreenHelper::screenOff()
 {
     qCInfo(dcPlatformIntegration()) << "Turning screen off";
-    int ret = m_powerFile.write("1\n");
+    qint64 ret = m_powerFile.write("1\n");
     m_powerFile.flush();
     if (ret < 0) {
         qCWarning(dcPlatformIntegration()) << "Failed to power off screen";
     }
+    applyBrightness(m_currentBrightness);
+}
+
+void ScreenHelper::dimScreen()
+{
+    applyBrightness(qRound(m_currentBrightness * 0.5));
+    m_screenOffTimer.start();
+}
+
+void ScreenHelper::applyBrightness(int percent)
+{
+    int absolue = percent * m_maxBrightness / 100;
+    qCDebug(dcPlatformIntegration()) << "Setting screen brightness to" << absolue << "(" << percent << "%)";
+    m_brightnessFile.write(QString("%1\n").arg(absolue).toUtf8());
+    m_brightnessFile.flush();
 }
diff --git a/nymea-app/platformintegration/generic/screenhelper.h b/nymea-app/platformintegration/generic/screenhelper.h
index 138bdec5..956b45ca 100644
--- a/nymea-app/platformintegration/generic/screenhelper.h
+++ b/nymea-app/platformintegration/generic/screenhelper.h
@@ -53,9 +53,13 @@ public:
 private slots:
     void screenOn();
     void screenOff();
+    void dimScreen();
+
+    void applyBrightness(int percent);
 
 private:
     QTimer m_screenOffTimer;
+    QTimer m_screenDimTimer;
     QFile m_powerFile;
     QFile m_brightnessFile;
 
diff --git a/packaging/ubuntu/debian/nymea-app-kiosk-wayland.postinst b/packaging/ubuntu/debian/nymea-app-kiosk-wayland.postinst
new file mode 100644
index 00000000..9aad2334
--- /dev/null
+++ b/packaging/ubuntu/debian/nymea-app-kiosk-wayland.postinst
@@ -0,0 +1,17 @@
+#!/bin/sh
+
+# Restart nymea-app after update if it's running
+systemctl daemon-reload
+systemctl status nymea-app-kiosk > /dev/null 2>&1
+if [ $? -eq 0 ]; then
+        systemctl restart nymea-app-kiosk
+        if [ $? -eq 0 ]; then
+                echo "Successfully restarted nymea app kiosk."
+        else
+                echo "FAILED to restart nymea app kiosk."
+        fi
+fi
+
+#DEBHELPER#
+
+exit 0