capability to load QML kcms in plasmoid config windows

With the same mechanism as plasma 1, add the possibility to load kcms directly
 in the plasmoids config windows. this works only for qml based ones.
the apply enable and trigger is correctly wired between the config dialog
and kcm apis.

Change-Id: I66b5ab2253dcbb5f223b5dcf5616efc9d5aab274
REVIEW:123673

src/plasma/data/servicetypes/plasma-applet.desktop

@@ -64,6 +64,9 @@ Type=QString
 [PropertyDef::X-Plasma-Provides]
 Type=QStringList
 
+[PropertyDef::X-Plasma-ConfigPlugins]
+Type=QStringList
+
 [PropertyDef::X-Plasma-StandAloneApp]
 Type=bool
 

src/plasmaquick/configmodel.cpp

@@ -35,6 +35,7 @@
 
 #include <klocalizedstring.h>
 #include <kdeclarative/kdeclarative.h>
+#include <KQuickAddons/ConfigModule>
 
 #include <Plasma/Corona>
 #include <Plasma/PluginLoader>
@@ -53,6 +54,7 @@ public:
     ConfigModel *q;
     QList<ConfigCategory *> categories;
     QWeakPointer<Plasma::Applet> appletInterface;
+    QHash<QString, KQuickAddons::ConfigModule *> kcms;
 
     void appendCategory(ConfigCategory *c);
     void clear();
@@ -153,6 +155,7 @@ QVariant ConfigModelPrivate::get(int row) const
         value["source"] = categories.at(row)->source();
     }
     value["visible"] = categories.at(row)->visible();
+    value["kcm"] = q->data(q->index(row, 0), ConfigModel::KCMRole);
 
     return value;
 }
@@ -167,6 +170,7 @@ ConfigModel::ConfigModel(QObject *parent)
     roleNames[SourceRole] = "source";
     roleNames[PluginNameRole] = "pluginName";
     roleNames[VisibleRole] = "visible";
+    roleNames[KCMRole] = "kcm";
 
     setRoleNames(roleNames);
 }
@@ -204,6 +208,25 @@ QVariant ConfigModel::data(const QModelIndex &index, int role) const
         return d->categories.at(index.row())->pluginName();
     case VisibleRole:
         return d->categories.at(index.row())->visible();
+    case KCMRole: {
+        const QString pluginName = d->categories.at(index.row())->pluginName();
+        if (d->kcms.contains(pluginName)) {
+            return QVariant::fromValue(d->kcms.value(pluginName));
+        }
+
+        KPluginLoader loader(KPluginLoader::findPlugin(pluginName));
+        KPluginFactory* factory = loader.factory();
+        if (!factory) {
+            qWarning() << "Error loading KCM:" << loader.errorString();
+        } else {
+            KQuickAddons::ConfigModule *cm = factory->create<KQuickAddons::ConfigModule >(const_cast<ConfigModel *>(this));
+            if (!cm) {
+                qWarning() << "Error creating KCM object from plugin" << loader.fileName();
+            }
+            d->kcms[pluginName] = cm;
+            return QVariant::fromValue(cm);
+        }
+    }
     default:
         return QVariant();
     }

src/plasmaquick/configmodel.h

@@ -70,7 +70,8 @@ public:
         IconRole,
         SourceRole,
         PluginNameRole,
-        VisibleRole
+        VisibleRole,
+        KCMRole
     };
     ConfigModel(QObject *parent = 0);
     ~ConfigModel();

src/plasmaquick/configview.cpp

@@ -35,6 +35,7 @@
 #include <klocalizedstring.h>
 #include <kdeclarative/kdeclarative.h>
 #include <packageurlinterceptor.h>
+#include <KQuickAddons/ConfigModule>
 
 #include <Plasma/Corona>
 #include <Plasma/PluginLoader>
@@ -64,6 +65,7 @@ public:
     ConfigView *q;
     QWeakPointer <Plasma::Applet> applet;
     ConfigModel *configModel;
+    ConfigModel *kcmConfigModel;
     Plasma::Corona *corona;
 
     //Attached Layout property of mainItem, if any
@@ -126,12 +128,27 @@ void ConfigViewPrivate::init()
     QQmlComponent *component = new QQmlComponent(q->engine(), QUrl::fromLocalFile(applet.data()->package().filePath("configmodel")), q);
     QObject *object = component->beginCreate(q->engine()->rootContext());
     configModel = qobject_cast<ConfigModel *>(object);
+
     if (configModel) {
         configModel->setApplet(applet.data());
     } else {
         delete object;
     }
 
+    const QStringList kcms = applet.data()->pluginInfo().property("X-Plasma-ConfigPlugins").value<QStringList>();
+    if (!kcms.isEmpty()) {
+        if (!configModel) {
+            configModel = new ConfigModel(q);
+        }
+
+        foreach (const QString &kcm, kcms) {
+            KPluginLoader loader(KPluginLoader::findPlugin(QLatin1String("kcms/") + kcm));
+            KPluginMetaData md(loader.fileName());
+
+            configModel->appendCategory(md.iconName(), md.name(), QString(), loader.fileName());
+        }
+    }
+
     q->engine()->rootContext()->setContextProperty("plasmoid", applet.data()->property("_plasma_graphicObject").value<QObject *>());
     q->engine()->rootContext()->setContextProperty("configDialog", q);
     component->completeCreate();