Basic QML theme support in Aurorae

Aurorae can load QML themes from Plasma package structures.
Code not yet tested as there are no packages yet.

clients/aurorae/src/CMakeLists.txt

@@ -26,3 +26,4 @@ install( FILES
     qml/DecorationButton.qml
     qml/MenuButton.qml
     DESTINATION ${DATA_INSTALL_DIR}/kwin/aurorae )
+install( FILES kwindecoration.desktop DESTINATION ${SERVICETYPES_INSTALL_DIR} )

clients/aurorae/src/aurorae.cpp

@@ -17,6 +17,7 @@ along with this program.  If not, see <http://www.gnu.org/licenses/>.
 
 #include "aurorae.h"
 #include "auroraetheme.h"
+#include "config-kwin.h"
 
 #include <QApplication>
 #include <QtDeclarative/QDeclarativeComponent>
@@ -27,6 +28,9 @@ along with this program.  If not, see <http://www.gnu.org/licenses/>.
 
 #include <KConfig>
 #include <KConfigGroup>
+#include <KDebug>
+#include <KPluginInfo>
+#include <KServiceTypeTrader>
 #include <KStandardDirs>
 #include <Plasma/FrameSvg>
 
@@ -39,6 +43,7 @@ AuroraeFactory::AuroraeFactory()
         , m_theme(new AuroraeTheme(this))
         , m_engine(new QDeclarativeEngine(this))
         , m_component(new QDeclarativeComponent(m_engine, this))
+        , m_engineType(AuroraeEngine)
 {
     init();
 }
@@ -49,7 +54,23 @@ void AuroraeFactory::init()
 
     KConfig conf("auroraerc");
     KConfigGroup group(&conf, "Engine");
+    if (group.hasKey("EngineType")) {
+        const QString engineType = group.readEntry("EngineType", "aurorae").toLower();
+        if (engineType == "qml") {
+            initQML(group);
+        } else {
+            // fallback to classic Aurorae Themes
+            initAurorae(conf, group);
+        }
+    } else {
+        // fallback to classic Aurorae Themes
+        initAurorae(conf, group);
+    }
+}
 
+void AuroraeFactory::initAurorae(KConfig &conf, KConfigGroup &group)
+{
+    m_engineType = AuroraeEngine;
     const QString themeName = group.readEntry("ThemeName", "example-deco");
     KConfig config("aurorae/themes/" + themeName + '/' + themeName + "rc", KConfig::FullConfig, "data");
     KConfigGroup themeGroup(&conf, themeName);
@@ -66,6 +87,41 @@ void AuroraeFactory::init()
     m_engine->rootContext()->setContextProperty("options", this);
 }
 
+void AuroraeFactory::initQML(const KConfigGroup &group)
+{
+    // try finding the QML package
+    const QString themeName = group.readEntry("ThemeName");
+    kDebug(1212) << "Trying to load QML Decoration " << themeName;
+    const QString internalname = themeName.toLower();
+
+    QString constraint = QString("[X-KDE-PluginInfo-Name] == '%1'").arg(internalname);
+    KService::List offers = KServiceTypeTrader::self()->query("KWin/Decoration", constraint);
+    if (offers.isEmpty()) {
+        kError(1212) << "Couldn't find QML Decoration " << themeName << endl;
+        // TODO: what to do in error case?
+        return;
+    }
+    KService::Ptr service = offers.first();
+    KPluginInfo plugininfo(service);
+    const QString pluginName = service->property("X-KDE-PluginInfo-Name").toString();
+    const QString scriptName = service->property("X-Plasma-MainScript").toString();
+    const QString file = KStandardDirs::locate("data", QLatin1String(KWIN_NAME) + "/decorations/" + pluginName + "/contents/" + scriptName);
+    if (file.isNull()) {
+        kDebug(1212) << "Could not find script file for " << pluginName;
+        // TODO: what to do in error case?
+        return;
+    }
+    m_engineType = QMLEngine;
+    // setup the QML engine
+    foreach (const QString &importPath, KGlobal::dirs()->findDirs("module", "imports")) {
+        m_engine->addImportPath(importPath);
+    }
+    foreach (const QString &importPath, KGlobal::dirs()->findDirs("data", QLatin1String(KWIN_NAME) + "/aurorae/")) {
+        m_engine->addImportPath(importPath);
+    }
+    m_component->loadUrl(QUrl::fromLocalFile(file));
+}
+
 AuroraeFactory::~AuroraeFactory()
 {
     s_instance = NULL;
@@ -88,6 +144,7 @@ bool AuroraeFactory::reset(unsigned long changed)
     if (changed & SettingFont){
         emit titleFontChanged();
     }
+    // TODO: adjust reset behavior
     const KConfig conf("auroraerc");
     const KConfigGroup group(&conf, "Engine");
     const QString themeName = group.readEntry("ThemeName", "example-deco");

clients/aurorae/src/aurorae.h

@@ -29,6 +29,8 @@ class QDeclarativeItem;
 class QGraphicsSceneMouseEvent;
 class QGraphicsScene;
 class QGraphicsView;
+class KConfig;
+class KConfigGroup;
 
 namespace Aurorae
 {
@@ -64,8 +66,14 @@ public:
     QFont inactiveTitleFont();
 
 private:
+    enum EngineType {
+        AuroraeEngine,
+        QMLEngine
+    };
     AuroraeFactory();
     void init();
+    void initAurorae(KConfig &conf, KConfigGroup &group);
+    void initQML(const KConfigGroup& group);
 
 Q_SIGNALS:
     void buttonsChanged();
@@ -77,6 +85,7 @@ private:
     AuroraeTheme *m_theme;
     QDeclarativeEngine *m_engine;
     QDeclarativeComponent *m_component;
+    EngineType m_engineType;
 };
 
 class AuroraeClient : public KDecorationUnstable

clients/aurorae/src/kwindecoration.desktop

@@ -0,0 +1,8 @@
+[Desktop Entry]
+Type=ServiceType
+X-KDE-ServiceType=KWin/Decoration
+
+Comment=KWin Window Decoration
+
+[PropertyDef::X-Plasma-MainScript]
+Type=QString