try to add a config

src/scriptengines/qml/plasmoid/wallpaperinterface.cpp

@@ -34,12 +34,9 @@
 WallpaperInterface::WallpaperInterface(ContainmentInterface *parent)
     : QQuickItem(parent),
       m_containmentInterface(parent),
-      m_qmlObject(0)
+      m_qmlObject(0),
+      m_configLoader(0)
 {
-    if (configScheme()) {
-        m_configuration = new ConfigPropertyMap(configScheme(), this);
-    }
-
     connect(m_containmentInterface->containment(), &Plasma::Containment::wallpaperChanged,
             this, &WallpaperInterface::syncWallpaperPackage);
 
@@ -64,8 +61,10 @@ Plasma::ConfigLoader *WallpaperInterface::configScheme()
 {
     if (!m_configLoader) {
         const QString xmlPath = m_pkg.filePath("mainconfigxml");
+
         KConfigGroup cfg = m_containmentInterface->containment()->config();
         cfg = KConfigGroup(&cfg, "Wallpaper");
+
         if (xmlPath.isEmpty()) {
             m_configLoader = new Plasma::ConfigLoader(&cfg, 0);
         } else {
@@ -88,6 +87,10 @@ void WallpaperInterface::syncWallpaperPackage()
     m_pkg.setDefaultPackageRoot("plasma/wallpapers");
     m_pkg.setPath(m_containmentInterface->containment()->wallpaper());
 
+    if (configScheme()) {
+        m_configuration = new ConfigPropertyMap(configScheme(), this);
+    }
+
     m_qmlObject->setSource(QUrl::fromLocalFile(m_pkg.filePath("mainscript")));
     m_qmlObject->engine()->rootContext()->setContextProperty("wallpaper", this);
     m_qmlObject->completeInitialization();

src/shell/qmlpackages/wallpaper/contents/config/main.xml

@@ -0,0 +1,15 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<kcfg xmlns="http://www.kde.org/standards/kcfg/1.0"
+      xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+      xsi:schemaLocation="http://www.kde.org/standards/kcfg/1.0
+      http://www.kde.org/standards/kcfg/1.0/kcfg.xsd" >
+  <kcfgfile name=""/>
+
+  <group name="General">
+    <entry name="Color" type="Color">
+      <label>Color of the wallpaper</label>
+      <default>#0000ff</default>
+    </entry>
+  </group>
+
+</kcfg>

src/shell/qmlpackages/wallpaper/contents/ui/main.qml

@@ -20,6 +20,6 @@ import QtQuick 2.0
 
 Rectangle {
     id: root
-    color: "darkblue"
-
+    color: wallpaper.configuration.Color
+Text{text:"Color:"+wallpaper.configuration.Color}
 }