Progress bar for windows taskbar button

PdfForQtViewer/PdfForQtViewer.pro

@@ -4,7 +4,7 @@
 #
 #-------------------------------------------------
 
-QT       += core gui
+QT       += core gui winextras
 
 greaterThan(QT_MAJOR_VERSION, 4): QT += widgets
 

PdfForQtViewer/pdfviewermainwindow.cpp

@@ -61,10 +61,16 @@ PDFViewerMainWindow::PDFViewerMainWindow(QWidget *parent) :
     m_pageNumberSpinBox(nullptr),
     m_pageNumberLabel(nullptr),
     m_pageZoomSpinBox(nullptr),
-    m_isLoadingUI(false)
+    m_isLoadingUI(false),
+    m_progress(new pdf::PDFProgress(this)),
+    m_taskbarButton(new QWinTaskbarButton(this)),
+    m_progressTaskbarIndicator(nullptr)
 {
     ui->setupUi(this);
 
+    // Initialize task bar progress
+    m_progressTaskbarIndicator = m_taskbarButton->progress();
+
     // Initialize shortcuts
     ui->actionOpen->setShortcut(QKeySequence::Open);
     ui->actionClose->setShortcut(QKeySequence::Close);
@@ -164,6 +170,9 @@ PDFViewerMainWindow::PDFViewerMainWindow(QWidget *parent) :
     connect(m_pdfWidget->getDrawWidgetProxy(), &pdf::PDFDrawWidgetProxy::pageLayoutChanged, this, &PDFViewerMainWindow::onPageLayoutChanged);
     connect(m_pdfWidget, &pdf::PDFWidget::pageRenderingErrorsChanged, this, &PDFViewerMainWindow::onPageRenderingErrorsChanged, Qt::QueuedConnection);
     connect(m_settings, &PDFViewerSettings::settingsChanged, this, &PDFViewerMainWindow::onViewerSettingsChanged);
+    connect(m_progress, &pdf::PDFProgress::progressStarted, this, &PDFViewerMainWindow::onProgressStarted);
+    connect(m_progress, &pdf::PDFProgress::progressStep, this, &PDFViewerMainWindow::onProgressStep);
+    connect(m_progress, &pdf::PDFProgress::progressFinished, this, &PDFViewerMainWindow::onProgressFinished);
 
     updatePageLayoutActions();
     updateUI(true);
@@ -242,6 +251,23 @@ void PDFViewerMainWindow::onPageZoomSpinboxEditingFinished()
     m_pdfWidget->getDrawWidgetProxy()->zoom(m_pageZoomSpinBox->value() / 100.0);
 }
 
+void PDFViewerMainWindow::onProgressStarted()
+{
+    m_progressTaskbarIndicator->setRange(0, 100);
+    m_progressTaskbarIndicator->reset();
+    m_progressTaskbarIndicator->show();
+}
+
+void PDFViewerMainWindow::onProgressStep(int percentage)
+{
+    m_progressTaskbarIndicator->setValue(percentage);
+}
+
+void PDFViewerMainWindow::onProgressFinished()
+{
+    m_progressTaskbarIndicator->hide();
+}
+
 void PDFViewerMainWindow::readSettings()
 {
     QSettings settings(QSettings::IniFormat, QSettings::UserScope, QCoreApplication::organizationName(), QCoreApplication::applicationName());
@@ -403,7 +429,7 @@ void PDFViewerMainWindow::openDocument(const QString& fileName)
 
     // Try to open a new document
     QApplication::setOverrideCursor(Qt::WaitCursor);
-    pdf::PDFDocumentReader reader(qMove(getPasswordCallback));
+    pdf::PDFDocumentReader reader(m_progress, qMove(getPasswordCallback));
     pdf::PDFDocument document = reader.readFromFile(fileName);
     QApplication::restoreOverrideCursor();
 
@@ -497,6 +523,12 @@ void PDFViewerMainWindow::closeEvent(QCloseEvent* event)
     event->accept();
 }
 
+void PDFViewerMainWindow::showEvent(QShowEvent* event)
+{
+    Q_UNUSED(event);
+    m_taskbarButton->setWindow(windowHandle());
+}
+
 void PDFViewerMainWindow::on_actionPageLayoutSinglePage_triggered()
 {
     setPageLayout(pdf::PageLayout::SinglePage);

PdfForQtViewer/pdfviewermainwindow.h

@@ -20,12 +20,14 @@
 
 #include "pdfcatalog.h"
 #include "pdfrenderer.h"
-
+#include "pdfprogress.h"
 #include "pdfviewersettings.h"
 
 #include <QTreeView>
 #include <QMainWindow>
 #include <QSharedPointer>
+#include <QWinTaskbarButton>
+#include <QWinTaskbarProgress>
 
 class QLabel;
 class QSpinBox;
@@ -56,6 +58,7 @@ public:
     virtual ~PDFViewerMainWindow() override;
 
     virtual void closeEvent(QCloseEvent* event) override;
+    virtual void showEvent(QShowEvent* event) override;
 
 private slots:
     void on_actionPageLayoutSinglePage_triggered();
@@ -77,6 +80,10 @@ private:
     void onPageNumberSpinboxEditingFinished();
     void onPageZoomSpinboxEditingFinished();
 
+    void onProgressStarted();
+    void onProgressStep(int percentage);
+    void onProgressFinished();
+
     void readSettings();
     void writeSettings();
 
@@ -111,6 +118,9 @@ private:
     QLabel* m_pageNumberLabel;
     QDoubleSpinBox* m_pageZoomSpinBox;
     bool m_isLoadingUI;
+    pdf::PDFProgress* m_progress;
+    QWinTaskbarButton* m_taskbarButton;
+    QWinTaskbarProgress* m_progressTaskbarIndicator;
 };
 
 }   // namespace pdfviewer