I discovered static variables

WIP, some changes coming, notably a critical/low battery alert, and some
big code revamping.

alert.cpp

@@ -42,6 +42,14 @@ alert::alert(QWidget *parent) :
         ui->messageLabel->setText("An error occured during the update process.\nThe update package's version is lower than the actual installed version.");
         ui->stackedWidget->setCurrentIndex(1);
     }
+    if(global_static::battery::showCriticalBatteryAlert == true) {
+        global_static::battery::showCriticalBatteryAlert = false;
+        criticalBattery = true;
+        ui->securityLabel->setText("Please charge your eReader.");
+        ui->messageLabel->setText("The battery level is very low. To prevent damage to the filesystem, your device has been turned off.\nPlease consider charging it.");
+        ui->stackedWidget->setVisible(false);
+        poweroff(false);
+    }
 
     ui->warningLabel->setStyleSheet("QLabel { background-color : black; color : white; font-size: 16pt}");
     ui->messageLabel->setStyleSheet("QLabel { background-color : black; color : white; font-size: 9pt}");

alert.h

@@ -18,6 +18,7 @@ public:
     ~alert();
     bool signatureError = false;
     bool downgradeError = false;
+    bool criticalBattery = false;
 
 private slots:
     void on_continueBtn_clicked();

apps.ui

@@ -16,41 +16,6 @@
   <layout class="QVBoxLayout" name="verticalLayout">
    <item>
     <layout class="QGridLayout" name="gridLayout">
-     <item row="4" column="0">
-      <layout class="QGridLayout" name="gridLayout_2">
-       <property name="bottomMargin">
-        <number>0</number>
-       </property>
-       <item row="1" column="0">
-        <widget class="QPushButton" name="backBtn">
-         <property name="font">
-          <font>
-           <weight>75</weight>
-           <bold>true</bold>
-          </font>
-         </property>
-         <property name="text">
-          <string>
-Back
-</string>
-         </property>
-        </widget>
-       </item>
-       <item row="0" column="0">
-        <widget class="Line" name="line_2">
-         <property name="frameShadow">
-          <enum>QFrame::Plain</enum>
-         </property>
-         <property name="lineWidth">
-          <number>2</number>
-         </property>
-         <property name="orientation">
-          <enum>Qt::Horizontal</enum>
-         </property>
-        </widget>
-       </item>
-      </layout>
-     </item>
      <item row="0" column="0">
       <widget class="QLabel" name="label">
        <property name="font">
@@ -67,19 +32,6 @@ Back
        </property>
       </widget>
      </item>
-     <item row="3" column="0">
-      <spacer name="verticalSpacer">
-       <property name="orientation">
-        <enum>Qt::Vertical</enum>
-       </property>
-       <property name="sizeHint" stdset="0">
-        <size>
-         <width>20</width>
-         <height>40</height>
-        </size>
-       </property>
-      </spacer>
-     </item>
      <item row="2" column="0">
       <layout class="QGridLayout" name="gridLayout_3">
        <property name="bottomMargin">
@@ -214,6 +166,54 @@ Back
        </item>
       </layout>
      </item>
+     <item row="5" column="0">
+      <layout class="QGridLayout" name="gridLayout_2">
+       <property name="bottomMargin">
+        <number>0</number>
+       </property>
+       <item row="1" column="0">
+        <widget class="QPushButton" name="backBtn">
+         <property name="font">
+          <font>
+           <weight>75</weight>
+           <bold>true</bold>
+          </font>
+         </property>
+         <property name="text">
+          <string>
+Back
+</string>
+         </property>
+        </widget>
+       </item>
+       <item row="0" column="0">
+        <widget class="Line" name="line_2">
+         <property name="frameShadow">
+          <enum>QFrame::Plain</enum>
+         </property>
+         <property name="lineWidth">
+          <number>2</number>
+         </property>
+         <property name="orientation">
+          <enum>Qt::Horizontal</enum>
+         </property>
+        </widget>
+       </item>
+      </layout>
+     </item>
+     <item row="4" column="0">
+      <spacer name="verticalSpacer">
+       <property name="orientation">
+        <enum>Qt::Vertical</enum>
+       </property>
+       <property name="sizeHint" stdset="0">
+        <size>
+         <width>20</width>
+         <height>40</height>
+        </size>
+       </property>
+      </spacer>
+     </item>
      <item row="1" column="0">
       <widget class="Line" name="line">
        <property name="frameShadow">
@@ -227,6 +227,18 @@ Back
        </property>
       </widget>
      </item>
+     <item row="3" column="0">
+      <widget class="QStackedWidget" name="rootAppsWidget">
+       <widget class="QWidget" name="page">
+        <layout class="QVBoxLayout" name="verticalLayout_2">
+         <item>
+          <layout class="QGridLayout" name="gridLayout_4"/>
+         </item>
+        </layout>
+       </widget>
+       <widget class="QWidget" name="page_2"/>
+      </widget>
+     </item>
     </layout>
    </item>
   </layout>

functions.h

@@ -9,6 +9,18 @@
 #include <QProcess>
 #include <regex>
 
+// WoW, static variables and namespaces are awesome
+namespace global_static {
+    namespace battery {
+        static bool showLowBatteryDialog = true;
+        static bool showCriticalBatteryAlert = false;
+    }
+    namespace reader {
+        static int pageNumber;
+        static bool skipOpenDialog = false;
+    }
+}
+
 // https://stackoverflow.com/questions/6080853/c-multiple-definition-error-for-global-functions-in-the-header-file/20679534#20679534
 namespace {
     QString checkconfig_str_val;
@@ -154,5 +166,57 @@ namespace {
         config.close();
         return 0;
     };
+    bool isBatteryLow() {
+        // Checks if battery level is under 15% of total capacity.
+        get_battery_level();
+        if(batt_level_int <= 15) {
+            return true;
+        }
+        else {
+            return false;
+        }
+        return 0;
+    }
+    bool isBatteryCritical() {
+        // Checks if the battery level is critical (i.e. <= 5%)
+        get_battery_level();
+        if(batt_level_int <= 5) {
+            return true;
+        }
+        else {
+            return false;
+        }
+        return 0;
+    }
+    void poweroff(bool splash) {
+        if(splash == true) {
+            QString prog ("poweroff");
+            QStringList args;
+            QProcess *proc = new QProcess();
+            proc->start(prog, args);
+        }
+        else {
+            QString prog ("busybox");
+            QStringList args;
+            args << "poweroff";
+            QProcess *proc = new QProcess();
+            proc->start(prog, args);
+        }
+    }
+    void reboot(bool splash) {
+        if(splash == true) {
+            QString prog ("reboot");
+            QStringList args;
+            QProcess *proc = new QProcess();
+            proc->start(prog, args);
+        }
+        else {
+            QString prog ("busybox");
+            QStringList args;
+            args << "reboot";
+            QProcess *proc = new QProcess();
+            proc->start(prog, args);
+        }
+    }
 }
 #endif // FUNCTIONS_H

generaldialog.cpp

@@ -1,6 +1,8 @@
 #include "generaldialog.h"
 #include "ui_generaldialog.h"
 #include "functions.h"
+#include "reader.h"
+#include "mainwindow.h"
 
 #include <QFile>
 #include <QDebug>
@@ -68,6 +70,17 @@ generalDialog::generalDialog(QWidget *parent) :
         this->adjustSize();
         string_writeconfig("/inkbox/settingsRebootDialog", "false");
     }
+    if(mainwindow_static::lowBatteryDialog == true) {
+        lowBatteryDialog = true;
+        ui->stackedWidget->setCurrentIndex(1);
+        get_battery_level();
+        QString message = "Warning! Battery is low. Please consider charging your eReader.\nCurrent level: ";
+        message.append(batt_level);
+        ui->bodyLabel->setText(message);
+        ui->headerLabel->setText("Warning");
+        this->adjustSize();
+        string_writeconfig("/inkbox/lowBatteryDialog", "false");
+    }
     else {
         // We shouldn't be there ;)
         ;
@@ -141,7 +154,15 @@ void generalDialog::on_acceptBtn_clicked()
     // We don't have any other option ;p
     generalDialog::close();
 
+    if(lowBatteryDialog == true) {
+        mainwindow_static::lowBatteryDialog = false;
+        reader_static::batteryAlertLock = false;
+        global_static::battery::showLowBatteryDialog = false;
+    }
+
+    if(settingsRebootDialog == true) {
         QProcess process;
         process.startDetached("inkbox.sh", QStringList());
         qApp->quit();
     }
+}

generaldialog.h

@@ -19,6 +19,7 @@ public:
     bool resetDialog = false;
     bool updateDialog = false;
     bool settingsRebootDialog = false;
+    bool lowBatteryDialog = false;
 
 private slots:
     void on_cancelBtn_clicked();

main.cpp

@@ -24,9 +24,28 @@
 #include <QDebug>
 #include <QRect>
 #include <QScreen>
+#include <QTimer>
 
 int main(int argc, char *argv[])
 {
+    // Checking if battery level is critical; if true (and if it is not charging), then display a "Please charge your eReader" splash and power off.
+    if(isBatteryCritical() == true) {
+        string_checkconfig_ro("/sys/devices/platform/pmic_battery.1/power_supply/mc13892_bat/status");
+        if(checkconfig_str_val == "Charging\n") {
+            ;
+        }
+        else {
+            string_writeconfig("/inkbox/batteryCritical", "true");
+            QApplication a(argc, argv);
+            alert w;
+
+            const QScreen* screen = qApp->primaryScreen();
+            w.setGeometry(QRect(QPoint(0,0), screen->geometry().size()));
+            w.show();
+            return a.exec();
+        }
+    }
+
     // Checking if there has been an ALERT flag set up, and if there is, show a big warning
     if(checkconfig("/external_root/boot/flags/ALERT") == true) {
         QApplication a(argc, argv);

mainwindow.cpp

@@ -231,12 +231,7 @@ MainWindow::MainWindow(QWidget *parent)
 
             // Rebooting if needed
             if(reboot_after_update == true) {
-                QString rebootProg("busybox");
+                reboot(false);
-                QStringList rebootArgs;
-                rebootArgs << "reboot";
-                QProcess *rebootProc = new QProcess();
-                rebootProc->start(rebootProg, rebootArgs);
-                rebootProc->waitForFinished();
             }
             else {
                 // Update process finished.
@@ -422,6 +417,7 @@ MainWindow::MainWindow(QWidget *parent)
     if(checkconfig("/mnt/onboard/onboard/.inkbox/can_update") == true) {
         if(checkconfig("/tmp/cancelUpdateDialog") == false) {
             // I'm sorry.
+            qDebug() << "An update is available.";
             QTimer::singleShot(2000, this, SLOT(openUpdateDialog()));
         }
         else {
@@ -429,6 +425,12 @@ MainWindow::MainWindow(QWidget *parent)
         }
     }
 
+    // Checking if battery level is low
+    if(isBatteryLow() == true) {
+        qDebug() << "Warning! Battery is low!";
+        QTimer::singleShot(2000, this, SLOT(openLowBatteryDialog()));
+    }
+
     // Check if it's the first boot since an update and confirm that it installed successfully
     if(checkconfig("/opt/inkbox_genuine") == true) {
         if(checkconfig("/external_root/opt/update/inkbox_updated") == true) {
@@ -451,7 +453,7 @@ MainWindow::~MainWindow()
 }
 
 void MainWindow::openUpdateDialog() {
-    updateDialog = true;
+    mainwindow_static::updateDialog = true;
     // We write to a temporary file to show a "Reset" prompt
     string_writeconfig("/inkbox/updateDialog", "true");
 
@@ -462,6 +464,15 @@ void MainWindow::openUpdateDialog() {
     QApplication::processEvents();
 }
 
+void MainWindow::openLowBatteryDialog() {
+    mainwindow_static::lowBatteryDialog = true;
+
+    generalDialogWindow = new generalDialog(this);
+    generalDialogWindow->setAttribute(Qt::WA_DeleteOnClose);
+    generalDialogWindow->show();
+    QApplication::processEvents();
+}
+
 void MainWindow::on_settingsBtn_clicked()
 {
     settingsWindow = new settings();

mainwindow.h

@@ -12,6 +12,11 @@
 #include "generaldialog.h"
 using namespace std;
 
+namespace mainwindow_static {
+    static bool updateDialog = false;
+    static bool lowBatteryDialog = false;
+}
+
 QT_BEGIN_NAMESPACE
 namespace Ui { class MainWindow; }
 QT_END_NAMESPACE
@@ -25,7 +30,6 @@ public:
     ~MainWindow();
     bool existing_recent_books = false;
     bool reboot_after_update = false;
-    bool updateDialog = false;
     int timerTime = 0;
     QString relative_path;
 public slots:
@@ -42,6 +46,7 @@ private slots:
     void on_book4Btn_clicked();
     void on_brightnessBtn_clicked();
     void openUpdateDialog();
+    void openLowBatteryDialog();
 
 private:
     Ui::MainWindow *ui;

quit.cpp

@@ -46,18 +46,12 @@ quit::~quit()
 
 void quit::on_pushButton_clicked()
 {
-    QString prog ("poweroff");
+    poweroff(true);
-    QStringList args;
-    QProcess *proc = new QProcess();
-    proc->start(prog, args);
 }
 
 void quit::on_pushButton_2_clicked()
 {
-    QString prog ("reboot");
+    reboot(true);
-    QStringList args;
-    QProcess *proc = new QProcess();
-    proc->start(prog, args);
 }
 
 void quit::on_pushButton_4_clicked()

reader.cpp

@@ -213,6 +213,25 @@ reader::reader(QWidget *parent) :
            get_battery_level();
            ui->batteryLabel->setText(batt_level);
            ui->timeLabel->setText(time);
+           if(global_static::battery::showLowBatteryDialog != true) {
+               // Do nothing, since a dialog should already have been displayed and (probably) dismissed
+               ;
+           }
+           else {
+                   if(reader_static::batteryAlertLock == true) {
+                       ;
+                   }
+                   else {
+                       if(isBatteryCritical() == true) {
+                           openCriticalBatteryAlertWindow();
+                       }
+                       else {
+                           if(isBatteryLow() == true) {
+                               openLowBatteryDialog();
+                           }
+                       }
+                   }
+           }
         } );
         t->start();
     }
@@ -224,6 +243,25 @@ reader::reader(QWidget *parent) :
            get_battery_level();
            ui->batteryLabel->setText(batt_level);
            ui->timeLabel->setText(time);
+           if(global_static::battery::showLowBatteryDialog != true) {
+               // Do nothing, since a dialog should already have been displayed and (probably) dismissed
+               ;
+           }
+           else {
+                   if(reader_static::batteryAlertLock == true) {
+                       ;
+                   }
+                   else {
+                       if(isBatteryCritical() == true) {
+                           openCriticalBatteryAlertWindow();
+                       }
+                       else {
+                           if(isBatteryLow() == true) {
+                               openLowBatteryDialog();
+                           }
+                       }
+                   }
+           }
         } );
         t->start();
     }
@@ -599,6 +637,7 @@ void reader::on_fontChooser_currentIndexChanged(const QString &arg1)
         string_writeconfig(".config/04-book/font", "Libertinus Serif");
     }
     if(arg1 == "Crimson Pro") {
+        // As adding Crimson Pro to the default fonts bundled along with the Qt libs breaks the general Inter homogeneity, it is incorporated on-demand here.
         int id = QFontDatabase::addApplicationFont(":/resources/fonts/CrimsonPro-Regular.ttf");
         QString family = QFontDatabase::applicationFontFamilies(id).at(0);
         QFont crimson(family);
@@ -863,3 +902,25 @@ void reader::quit_restart() {
     process.startDetached("inkbox", QStringList());
     qApp->quit();
 }
+
+void reader::batteryWatchdog() {
+
+}
+
+void reader::openLowBatteryDialog() {
+    reader_static::batteryAlertLock = true;
+
+    generalDialogWindow = new generalDialog(this);
+    generalDialogWindow->setAttribute(Qt::WA_DeleteOnClose);
+    generalDialogWindow->show();
+    QApplication::processEvents();
+}
+
+void reader::openCriticalBatteryAlertWindow() {
+    global_static::battery::showCriticalBatteryAlert = true;
+
+    alertWindow = new alert(this);
+    alertWindow->setAttribute(Qt::WA_DeleteOnClose);
+    alertWindow->showFullScreen();
+    QApplication::processEvents();
+}

reader.h

@@ -2,6 +2,8 @@
 #define READER_H
 
 #include "functions.h"
+#include "alert.h"
+#include "generaldialog.h"
 
 #include <QWidget>
 #include <QProcess>
@@ -13,6 +15,10 @@
 
 using namespace std;
 
+namespace reader_static {
+    static bool batteryAlertLock = false;
+}
+
 namespace Ui {
 class reader;
 }
@@ -230,6 +236,9 @@ public:
     void menubar_hide();
     void wordwidget_show();
     void wordwidget_hide();
+    void batteryWatchdog();
+    void openLowBatteryDialog();
+    void openCriticalBatteryAlertWindow();
 
 private slots:
     void on_nextBtn_clicked();
@@ -255,6 +264,8 @@ private slots:
 
 private:
     Ui::reader *ui;
+    alert *alertWindow;
+    generalDialog *generalDialogWindow;
 };
 
 #endif // READER_H