Loader widget is shown while catalog is being downloaded

Added a new widget (KiwixLoader) which is displayed when the catalog is being downloaded.

kiwix-desktop.pro

@@ -39,6 +39,7 @@ SOURCES += \
     src/contenttypefilter.cpp \
     src/findinpagebar.cpp \
     src/kiwixconfirmbox.cpp \
+    src/kiwixloader.cpp \
     src/node.cpp \
     src/suggestionlistworker.cpp \
     src/thumbnaildownloader.cpp \
@@ -78,6 +79,7 @@ HEADERS += \
     src/contenttypefilter.h \
     src/findinpagebar.h \
     src/kiwixconfirmbox.h \
+    src/kiwixloader.h \
     src/node.h \
     src/suggestionlistworker.h \
     src/thumbnaildownloader.h \

src/contentmanager.cpp

@@ -60,6 +60,7 @@ ContentManager::ContentManager(Library* library, kiwix::Downloader* downloader,
     });
     connect(&m_remoteLibraryManager, &OpdsRequestManager::requestReceived, this, &ContentManager::updateRemoteLibrary);
     connect(mp_view->getView(), SIGNAL(customContextMenuRequested(const QPoint &)), this, SLOT(onCustomContextMenu(const QPoint &)));
+    connect(this, &ContentManager::pendingRequest, mp_view, &ContentManagerView::showLoader);
 }
 
 QList<QMap<QString, QVariant>> ContentManager::getBooksList()

src/contentmanagerview.cpp

@@ -23,6 +23,9 @@ ContentManagerView::ContentManagerView(QWidget *parent)
     searcher->setPlaceholderText(gt("search-files"));
     searcher->setStyleSheet(styleSheet);
 
+    loader = new KiwixLoader(mp_ui->loading);
+    mp_ui->stackedWidget->setCurrentIndex(0);
+
     QIcon searchIcon = QIcon(":/icons/search.svg");
     searcher->addAction(searchIcon, QLineEdit::LeadingPosition);
 
@@ -46,3 +49,13 @@ ContentManagerView::~ContentManagerView()
 {
 
 }
+
+void ContentManagerView::showLoader(bool show)
+{
+    mp_ui->stackedWidget->setCurrentIndex(show);
+    if (show) {
+        loader->startAnimation();
+    } else {
+        loader->stopAnimation();
+    }
+}

src/contentmanagerview.h

@@ -3,6 +3,7 @@
 
 #include <QWidget>
 #include "ui_contentmanagerview.h"
+#include "kiwixloader.h"
 
 namespace Ui {
 class contentmanagerview;
@@ -18,8 +19,12 @@ public:
     QTreeView* getView() { return mp_ui->m_view; }
     QLineEdit* &getSearcher() { return mp_ui->searcher; }
 
+public slots:
+    void showLoader(bool show);
+
 private:
     Ui::contentmanagerview *mp_ui;
+    KiwixLoader *loader;
 };
 
 #endif // CONTENTMANAGERVIEW_H

src/contentmanagerview.ui

@@ -13,16 +13,34 @@
   <property name="windowTitle">
    <string>Form</string>
   </property>
-  <layout class="QGridLayout" name="gridLayout">
+  <layout class="QVBoxLayout" name="verticalLayout_2">
-   <item row="0" column="0">
+   <item>
-    <layout class="QVBoxLayout" name="verticalLayout">
+    <widget class="QStackedWidget" name="stackedWidget">
-     <item>
+     <property name="currentIndex">
-      <widget class="QLineEdit" name="searcher"/>
+      <number>1</number>
-     </item>
+     </property>
-     <item>
+     <widget class="QWidget" name="contents">
-      <widget class="QTreeView" name="m_view"/>
+      <layout class="QVBoxLayout" name="verticalLayout_3">
-     </item>
+       <item>
-    </layout>
+        <layout class="QVBoxLayout" name="verticalLayout">
+         <item>
+          <widget class="QLineEdit" name="searcher"/>
+         </item>
+         <item>
+          <widget class="QTreeView" name="m_view"/>
+         </item>
+        </layout>
+       </item>
+      </layout>
+     </widget>
+     <widget class="QWidget" name="loading">
+      <layout class="QGridLayout" name="gridLayout">
+       <item row="0" column="0">
+        <widget class="QWidget" name="widget" native="true"/>
+       </item>
+      </layout>
+     </widget>
+    </widget>
    </item>
   </layout>
  </widget>

src/kiwixloader.cpp

@@ -0,0 +1,75 @@
+#include "kiwixloader.h"
+#include <QPainter>
+#include <QPainterPath>
+#include <QDebug>
+#include <QSizePolicy>
+
+KiwixLoader::KiwixLoader(QWidget *parent)
+    : QWidget(parent), m_timer(nullptr)
+{
+    setFixedSize(parent->width(), parent->height());
+    m_timer = new QTimer(this);
+    connect(m_timer, &QTimer::timeout, this, &KiwixLoader::updateAnimation);
+}
+
+KiwixLoader::~KiwixLoader()
+{
+}
+
+void KiwixLoader::stopAnimation()
+{
+    m_timer->stop();
+}
+
+void KiwixLoader::startAnimation()
+{
+    m_timer->start(20);
+}
+
+void createArc(QPainter &painter, int startAngle, int spanAngle, QRect rectangle, QPen pen)
+{
+    painter.setRenderHint(QPainter::Antialiasing);
+    int arcX = rectangle.x();
+    int arcY = rectangle.y();
+    int arcW = rectangle.width();
+    int arcH = rectangle.height();
+    QPainterPath path;
+    path.moveTo(arcX + arcW, arcY + arcH/2);
+    path.arcTo(rectangle, startAngle, spanAngle);
+    painter.strokePath(path, pen);
+}
+
+void KiwixLoader::paintEvent(QPaintEvent *event)
+{
+    QPainter painter(this);
+    painter.setRenderHint(QPainter::Antialiasing);
+
+    int width = 100;
+    int height = 100;
+    setFixedSize(this->parentWidget()->width(), this->parentWidget()->height());
+    int centerX = this->parentWidget()->width()/2 - width;
+    int centerY = this->parentWidget()->height()/2 - height;
+
+    QPen pen;
+    pen.setWidth(5);
+    painter.setPen(pen);
+    painter.setRenderHint(QPainter::Antialiasing);
+
+    QRect rectangle(centerX, centerY, width, height);
+
+    pen.setColor("#eaecf0");
+    createArc(painter, 0, 360, rectangle, pen);
+
+    int startAngle = 0;
+    int spanAngle = -progress;
+    pen.setColor("#3366cc");
+    createArc(painter, startAngle, spanAngle, rectangle, pen);
+}
+
+void KiwixLoader::updateAnimation()
+{
+    progress += 10;
+    if (progress == 360)
+        progress = 0;
+    update();
+}

src/kiwixloader.h

@@ -0,0 +1,28 @@
+#ifndef KIWIXLOADER_H
+#define KIWIXLOADER_H
+
+#include <QWidget>
+#include <QTimer>
+
+class KiwixLoader : public QWidget
+{
+    Q_OBJECT
+
+public:
+    explicit KiwixLoader(QWidget *parent = nullptr);
+    ~KiwixLoader();
+    void startAnimation();
+    void stopAnimation();
+
+protected:
+    void paintEvent(QPaintEvent *event) override;
+
+private slots:
+    void updateAnimation();
+
+private:
+    QTimer *m_timer;
+    int progress = 0;
+};
+
+#endif // KIWIXLOADER_H