From 575c32022d326eb391054c0608d5fc82cebb9281 Mon Sep 17 00:00:00 2001
From: tanyulong <tanyulong@kylinos.cn>
Date: Fri, 9 Jul 2021 16:55:22 +0800
Subject: [PATCH] fix vnc crashed

---
 plugins/system/display/display.cpp | 30 ++++++++++++++++++++++++++++++
 plugins/system/display/display.h   |  4 +++-
 2 files changed, 33 insertions(+), 1 deletion(-)

diff --git a/plugins/system/display/display.cpp b/plugins/system/display/display.cpp
index de931b6..383c564 100755
--- a/plugins/system/display/display.cpp
+++ b/plugins/system/display/display.cpp
@@ -25,6 +25,8 @@
 #include <KF5/KScreen/kscreen/getconfigoperation.h>
 #include <KF5/KScreen/kscreen/output.h>
 #include <QDebug>
+#include <QDBusInterface>
+#include <QDBusConnection>
 
 DisplaySet::DisplaySet(){
     pluginWidget = new Widget;
@@ -43,6 +45,15 @@ DisplaySet::~DisplaySet(){
 }
 
 QWidget *DisplaySet::get_plugin_ui(){
+   if (mFirstLoad) {
+        requestBackend();
+        mFirstLoad = false;
+        pluginWidget = new Widget;
+        QObject::connect(new KScreen::GetConfigOperation(), &KScreen::GetConfigOperation::finished,
+                         [&](KScreen::ConfigOperation *op) {
+            pluginWidget->setConfig(qobject_cast<KScreen::GetConfigOperation*>(op)->config());
+        });
+    }
     return pluginWidget;
 }
 
@@ -63,3 +74,22 @@ const QString DisplaySet::name() const {
     return QStringLiteral("display");
 }
 
+void DisplaySet::requestBackend() {
+
+    QDBusInterface screenIft("org.kde.KScreen",
+                             "/",
+                             "org.kde.KScreen",
+                             QDBusConnection::sessionBus());
+    if (!screenIft.isValid()) {
+        QProcess process;
+        process.start("uname -m");
+        process.waitForFinished();
+        QString output = process.readAll();
+        output = output.simplified();
+
+        QString command = "/usr/lib/" + output + "-linux-gnu" +"/libexec/kf5/kscreen_backend_launcher";
+        QProcess::startDetached(command);
+    }
+}
+
+
diff --git a/plugins/system/display/display.h b/plugins/system/display/display.h
index e4f4fbd..b30e9bb 100755
--- a/plugins/system/display/display.h
+++ b/plugins/system/display/display.h
@@ -47,13 +47,15 @@ public:
     void plugin_delay_control() Q_DECL_OVERRIDE;
     const QString name() const  Q_DECL_OVERRIDE;
 
-
+private:
+    void requestBackend();
 private:
     Ui::DisplayWindow * ui;
     QString pluginName;
     int pluginType;
     Widget * pluginWidget;
 
+    bool mFirstLoad;
 };
 
 #endif // DISPLAYSET_H
-- 
2.23.0