Load timezone data asynchronously so we don't block the GUI thread on

startup.

src/modules/locale/LocaleViewStep.cpp

@@ -19,15 +19,39 @@
 #include "LocaleViewStep.h"
 
 #include "LocalePage.h"
-
 #include "timezonewidget/localeglobal.h"
 
+#include "utils/CalamaresUtilsGui.h"
+
+#include <QBoxLayout>
+#include <QLabel>
+#include <QtConcurrent/QtConcurrentRun>
+
 LocaleViewStep::LocaleViewStep( QObject* parent )
     : Calamares::ViewStep( parent )
-    , m_widget( new LocalePage() )
+    , m_widget( new QWidget() )
+    , m_actualWidget( new LocalePage() )
 {
-    LocaleGlobal::init(); //this takes a long time
-    m_widget->init();
+    QBoxLayout* mainLayout = new QHBoxLayout;
+    m_widget->setLayout( mainLayout );
+    CalamaresUtils::unmarginLayout( mainLayout );
+
+    QLabel* waitingLabel = new QLabel( "Loading location data..." );
+    waitingLabel->setAlignment( Qt::AlignCenter );
+    mainLayout->addWidget( waitingLabel );
+
+    connect( &m_initWatcher, &QFutureWatcher< void >::finished,
+             [=]
+    {
+        m_actualWidget->init();
+        m_widget->layout()->removeWidget( waitingLabel );
+        waitingLabel->deleteLater();
+        m_widget->layout()->addWidget( m_actualWidget );
+    });
+
+    QFuture< void > initFuture = QtConcurrent::run( LocaleGlobal::init );
+    m_initWatcher.setFuture( initFuture );
+
     emit nextStatusChanged( true );
 }
 
@@ -85,4 +109,3 @@ LocaleViewStep::isAtEnd() const
 {
     return true;
 }
-

src/modules/locale/LocaleViewStep.h

@@ -24,6 +24,8 @@
 #include "viewpages/ViewStep.h"
 #include "PluginDllMacro.h"
 
+#include <QFutureWatcher>
+
 class LocalePage;
 
 class PLUGINDLLEXPORT LocaleViewStep : public Calamares::ViewStep
@@ -50,7 +52,10 @@ public:
     bool isAtEnd() const override;
 
 private:
-    LocalePage* m_widget;
+    QWidget* m_widget;
+    QFutureWatcher< void > m_initWatcher;
+
+    LocalePage* m_actualWidget;
 };
 
 #endif // LOCALEVIEWSTEP_H