Local library: Basic setup working

A local books database is maintained at `/data/onboard/.inkbox/LocalLibrary.db`. It contains compressed JSON read by the GUI.

URGENT TODO: Fix `*** Error in '/mnt/onboard/.adds/inkbox/inkbox-bin': double free or corruption (out): 0x00648708 ***` error whenever we try to delete localLibraryWidget

functions.h

@@ -282,6 +282,16 @@ namespace {
         return quoteNumber;
         return 0;
     }
+    void writeFile(QString filename, QString content) {
+        QFile file(filename);
+        if(file.open(QIODevice::ReadWrite)) {
+            QTextStream stream(&file);
+            stream << content;
+        }
+        else {
+            QString function = __func__; log(function + ": Failed to write string '" + content + "' to file '" + filename + "'", "functions");
+        }
+    }
     void string_writeconfig(std::string file, std::string config_option) {
         std::ofstream fhandler;
         fhandler.open(file);

locallibrarywidget.cpp

@@ -12,6 +12,12 @@ localLibraryWidget::localLibraryWidget(QWidget *parent) :
     ui->setupUi(this);
     this->setFont(QFont("u001"));
 
+    ui->previousPageBtn->setProperty("type", "borderless");
+    ui->nextPageBtn->setProperty("type", "borderless");
+    ui->previousPageBtn->setIcon(QIcon(":/resources/chevron-left.png"));
+    ui->nextPageBtn->setIcon(QIcon(":/resources/chevron-right.png"));
+    ui->pageNumberLabel->setFont(QFont("Source Serif Pro"));
+
     if(global::deviceID == "n705\n" or global::deviceID == "n905\n") {
         buttonsNumber = 4;
     }
@@ -53,19 +59,22 @@ localLibraryWidget::localLibraryWidget(QWidget *parent) :
 
         // Book icon label
         bookIconArray[i] = new QLabel(this);
-        bookIconArray[i]->setStyleSheet("padding: 20px");
+        bookIconArray[i]->setStyleSheet("padding: 10px");
 
         // Book button
         bookBtnArray[i] = new QClickableLabel(this);
+        bookBtnArray[i]->setObjectName(QString::number(i));
+        connect(bookBtnArray[i], SIGNAL(bookID(int)), SLOT(btnOpenBook(int)));
         bookBtnArray[i]->setSizePolicy(QSizePolicy::MinimumExpanding, QSizePolicy::MinimumExpanding);
-        bookBtnArray[i]->setStyleSheet("color: black; background-color: white; border-radius: 10px; padding: 20px");
+        bookBtnArray[i]->setStyleSheet("color: black; background-color: white; border-radius: 10px; padding: 10px");
         bookBtnArray[i]->setFont(QFont("u001"));
 
         horizontalLayout->addWidget(bookIconArray[i]);
         horizontalLayout->addWidget(bookBtnArray[i]);
         ui->booksVerticalLayout->addLayout(horizontalLayout);
     }
-    setupBooksList();
+    setupDatabase();
+    setupBooksList(currentPageNumber);
 }
 
 localLibraryWidget::~localLibraryWidget()
@@ -73,10 +82,99 @@ localLibraryWidget::~localLibraryWidget()
     delete ui;
 }
 
-void localLibraryWidget::setupBooksList() {
+void localLibraryWidget::setupDatabase() {
-    for(int i = 1; i <= buttonsNumber; i++) {
+    QString localLibraryDatabasePath = "/mnt/onboard/onboard/.inkbox/LocalLibrary.db";
-        QPixmap pixmap(":/resources/starred_star.png");
+    setDefaultWorkDir();
-        bookIconArray[i]->setPixmap(pixmap.scaled(stdIconWidth, stdIconHeight));
+    if(!QFile::exists(localLibraryDatabasePath)) {
-        bookBtnArray[i]->setText("<b>Book " + QString::number(i) + "</b><br>Description");
+        QStringList booksList;
+        QDir dir("/mnt/onboard/onboard");
+
+        QDirIterator dirIt(dir, QDirIterator::Subdirectories);
+        while(dirIt.hasNext()) {
+            dirIt.next();
+            if(QFileInfo(dirIt.filePath()).isFile()) {
+                QString suffix = QFileInfo(dirIt.filePath()).suffix();
+                if(suffix == "epub" || suffix == "EPUB") {
+                    booksList << dirIt.filePath();
                 }
+            }
+        }
+
+        QString prog("sh");
+        QStringList args;
+        args << "explore_local_library.sh" << booksList;
+        QProcess *proc = new QProcess();
+        proc->setEnvironment((QStringList() << "EXTRACT_COVER=1"));
+        proc->start(prog, args);
+        proc->waitForFinished();
+        QJsonDocument jsonDocument = QJsonDocument::fromJson(proc->readAllStandardOutput());
+        proc->deleteLater();
+
+        // Write database in compressed form, encoded in Base64 format
+        writeFile(localLibraryDatabasePath, qCompress(jsonDocument.toJson()).toBase64());
+    }
+
+    // Read library database from file
+    QFile database(localLibraryDatabasePath);
+    QByteArray data;
+    if(database.open(QIODevice::ReadOnly)) {
+        data = database.readAll();
+        database.close();
+    }
+    else {
+        QString function = __func__; log(function + ": Failed to open local library database file for reading at '" + database.fileName() + "'", className);
+    }
+
+    // Uncompress data from Base64 encoding
+    databaseJsonDocument = QJsonDocument::fromJson(qUncompress(QByteArray::fromBase64(data)));
+    // Parse JSON data
+    databaseJsonObject = databaseJsonDocument.object();
+    databaseJsonArrayList = databaseJsonObject["database"].toArray();
+}
+
+void localLibraryWidget::setupBooksList(int pageNumber) {
+    idList->clear();
+    int in = 1;
+    for(int i = (1 * pageNumber * buttonsNumber) - (buttonsNumber - 1); i <= (1 * pageNumber * buttonsNumber); i++) {
+        // Read database info for each book and display the corresponding information on each button
+        QJsonObject jsonObject = databaseJsonArrayList.at(i - 1).toObject();
+        QString bookTitle = jsonObject["Title"].toString();
+        QString bookAuthor = jsonObject["Author"].toString();
+        QString coverPath = jsonObject["CoverPath"].toString();
+        QString bookID = jsonObject["BookID"].toString();
+        if(!coverPath.isEmpty()) {
+            QPixmap pixmap(coverPath);
+            bookIconArray[in]->setPixmap(pixmap);
+        }
+        idList->append(bookID.toInt());
+        bookBtnArray[in]->setText("<b>" + bookTitle + "</b>" + "<br>" + bookAuthor);
+        in++;
+    }
+    ui->pageNumberLabel->setText("Page " + QString::number(pageNumber) + " <i>of</i> " + "10");
+}
+
+void localLibraryWidget::on_previousPageBtn_clicked()
+{
+    currentPageNumber--;
+    setupBooksList(currentPageNumber);
+}
+
+
+void localLibraryWidget::on_nextPageBtn_clicked()
+{
+    currentPageNumber++;
+    setupBooksList(currentPageNumber);
+}
+
+void localLibraryWidget::openBook(int bookID) {
+    QJsonObject jsonObject = databaseJsonArrayList.at(bookID - 1).toObject();
+    QString bookPath = jsonObject["BookPath"].toString();
+    log("Opening book with ID " + QString::number(bookID) + ", path '" + bookPath + "'", className);
+    emit openBookSignal(bookPath, false);
+}
+
+void localLibraryWidget::btnOpenBook(int buttonNumber) {
+    int id = idList->at(buttonNumber - 1);
+    openBook(id);
+    // localLibraryWidget::close();
 }

locallibrarywidget.h

@@ -24,14 +24,27 @@ public:
     int sH;
     int stdIconWidth;
     int stdIconHeight;
+    QJsonDocument databaseJsonDocument;
+    QJsonObject databaseJsonObject;
+    QJsonArray databaseJsonArrayList;
+    int currentPageNumber = 1;
+    QList<int> idList[4];
 
 private slots:
-    void setupBooksList();
+    void setupDatabase();
+    void setupBooksList(int pageNumber);
+    void on_previousPageBtn_clicked();
+    void on_nextPageBtn_clicked();
+    void openBook(int id);
+    void btnOpenBook(int buttonNumber);
 
 private:
     Ui::localLibraryWidget * ui;
-    QLabel * bookIconArray[10];
+    QLabel * bookIconArray[4];
-    QClickableLabel * bookBtnArray[10];
+    QClickableLabel * bookBtnArray[4];
+
+signals:
+    void openBookSignal(QString bookFile, bool relativePath);
 };
 
 #endif // LOCALLIBRARYWIDGET_H

locallibrarywidget.ui

@@ -33,12 +33,50 @@
     <number>0</number>
    </property>
    <item>
+    <layout class="QGridLayout" name="gridLayout">
+     <item row="0" column="3">
+      <widget class="QLabel" name="pageNumberLabel">
+       <property name="text">
+        <string>Page</string>
+       </property>
+      </widget>
+     </item>
+     <item row="0" column="0">
       <widget class="QLabel" name="localLibraryLabel">
        <property name="text">
         <string>&lt;b&gt;Local library&lt;/b&gt;</string>
        </property>
       </widget>
      </item>
+     <item row="0" column="2">
+      <widget class="QPushButton" name="previousPageBtn">
+       <property name="text">
+        <string/>
+       </property>
+      </widget>
+     </item>
+     <item row="0" column="1">
+      <spacer name="horizontalSpacer">
+       <property name="orientation">
+        <enum>Qt::Horizontal</enum>
+       </property>
+       <property name="sizeHint" stdset="0">
+        <size>
+         <width>40</width>
+         <height>20</height>
+        </size>
+       </property>
+      </spacer>
+     </item>
+     <item row="0" column="4">
+      <widget class="QPushButton" name="nextPageBtn">
+       <property name="text">
+        <string/>
+       </property>
+      </widget>
+     </item>
+    </layout>
+   </item>
    <item>
     <layout class="QVBoxLayout" name="booksVerticalLayout">
      <property name="sizeConstraint">

mainwindow.cpp

@@ -934,7 +934,7 @@ void MainWindow::on_libraryButton_clicked()
             ui->libraryButton->setIcon(QIcon(":/resources/online-library-inverted.png"));
 
             // Create widget
-            libraryWidgetWindow = new libraryWidget();
+            libraryWidget * libraryWidgetWindow = new libraryWidget();
             connect(libraryWidgetWindow, SIGNAL(destroyed(QObject*)), SLOT(resetFullWindow()));
             libraryWidgetWindow->setAttribute(Qt::WA_DeleteOnClose);
             ui->stackedWidget->insertWidget(3, libraryWidgetWindow);
@@ -996,8 +996,9 @@ void MainWindow::resetWifiIconClickedWhileReconnecting() {
 }
 
 void MainWindow::setupLocalLibraryWidget() {
-    localLibraryWidgetWindow = new localLibraryWidget();
+    localLibraryWidget * localLibraryWidgetWindow = new localLibraryWidget();
-    libraryWidgetWindow->setAttribute(Qt::WA_DeleteOnClose);
+    connect(localLibraryWidgetWindow, SIGNAL(openBookSignal(QString, bool)), SLOT(openBookFile(QString, bool)));
+    localLibraryWidgetWindow->setAttribute(Qt::WA_DeleteOnClose);
     ui->homeStackedWidget->insertWidget(1, localLibraryWidgetWindow);
     ui->homeStackedWidget->setCurrentIndex(1);
 }

qclickablelabel.cpp

@@ -9,10 +9,11 @@ QClickableLabel::~QClickableLabel() {}
 
 void QClickableLabel::mousePressEvent(QMouseEvent * event) {
     emit clicked();
-    QClickableLabel::setStyleSheet("color: white; background-color: black; border-radius: 10px; padding: 20px");
+    QClickableLabel::setStyleSheet("color: white; background-color: black; border-radius: 10px; padding: 10px");
 }
 
 void QClickableLabel::mouseReleaseEvent(QMouseEvent * event) {
     emit unclicked();
-    QClickableLabel::setStyleSheet("color: black; background-color: white; border-radius: 10px; padding: 20px");
+    emit bookID(objectName().toInt());
+    QClickableLabel::setStyleSheet("color: black; background-color: white; border-radius: 10px; padding: 10px");
 }

qclickablelabel.h

@@ -15,6 +15,7 @@ public:
 signals:
     void clicked();
     void unclicked();
+    void bookID(int id);
 
 protected:
     void mousePressEvent(QMouseEvent * event);

settings.cpp

@@ -822,9 +822,18 @@ void settings::on_showSystemInfoBtn_clicked()
     // Show a system info dialog
     log("Showing system info dialog", className);
     generalDialogWindow = new generalDialog();
-    if(global::deviceID == "n306\n") {
+    if(global::deviceID == "n705\n" or global::deviceID == "n905\n") {
+        generalDialogWindow->yIncrease = 2;
+    }
+    else if(global::deviceID == "n613\n" or global::deviceID == "n236\n" or global::deviceID == "n306\n") {
         generalDialogWindow->yIncrease = 2.6;
     }
+    else if(global::deviceID == "n437\n" or global::deviceID == "n873\n") {
+        generalDialogWindow->yIncrease = 3;
+    }
+    else {
+        generalDialogWindow->yIncrease = 2;
+    }
     generalDialogWindow->increaseSize();
     generalDialogWindow->setAttribute(Qt::WA_DeleteOnClose);
 }