From 55fe4de96056cf7b6bdf708a2912927dc9857207 Mon Sep 17 00:00:00 2001
From: "Wladimir J. van der Laan" <laanwj@gmail.com>
Date: Tue, 7 Jan 2014 16:04:47 +0100
Subject: [PATCH] qt: Show window while shutting down

Makes it clear to the user that the application is still wrapping up
and the computer should not be turned off until it is finished.
---
 src/qt/bitcoin.cpp | 21 ++++++++++++++++++++-
 1 file changed, 20 insertions(+), 1 deletion(-)

diff --git a/src/qt/bitcoin.cpp b/src/qt/bitcoin.cpp
index d4a834acb..8bcf187ae 100644
--- a/src/qt/bitcoin.cpp
+++ b/src/qt/bitcoin.cpp
@@ -32,6 +32,8 @@
 #include <QTranslator>
 #include <QWeakPointer>
 #include <QThread>
+#include <QVBoxLayout>
+#include <QLabel>
 
 #if defined(QT_STATICPLUGIN)
 #include <QtPlugin>
@@ -347,17 +349,34 @@ void BitcoinApplication::requestShutdown()
     window->setClientModel(0);
     window->removeAllWallets();
     guiref.clear();
+
     delete walletModel;
+
+    // Show a simple window indicating shutdown status
+    QWidget *shutdownWindow = new QWidget();
+    QVBoxLayout *layout = new QVBoxLayout();
+    layout->addWidget(new QLabel(
+        tr("Bitcoin Core is shutting down...\n") +
+        tr("Do not shut down the computer until this window disappears.")));
+    shutdownWindow->setLayout(layout);
+
+    // Center shutdown window at where main window was
+    const QPoint global = window->mapToGlobal(window->rect().center());
+    shutdownWindow->move(global.x() - shutdownWindow->width() / 2, global.y() - shutdownWindow->height() / 2);
+    shutdownWindow->show();
+
+    // Request shutdown from core thread
     emit requestedShutdown();
 }
 
 void BitcoinApplication::initializeResult(int retval)
 {
     LogPrintf("Initialization result: %i\n", retval);
-    /// Set exit result: 0 if successful, 1 if failure
+    // Set exit result: 0 if successful, 1 if failure
     returnValue = retval ? 0 : 1;
     if(retval)
     {
+        // Miscellaneous initialization after core is initialized
         optionsModel->Upgrade(); // Must be done after AppInit2
 
         PaymentServer::LoadRootCAs();