Added preview menu and shortcuts for qt quick (Ctrl+Alt+R)

This was needed since we cannot start stuff otherwise without a project

Task-number: BAUHAUS-450
Reviewed-by: kkoehne

src/plugins/qmljseditor/qmljspreviewrunner.cpp

@@ -0,0 +1,46 @@
+#include "qmljspreviewrunner.h"
+
+#include <projectexplorer/environment.h>
+#include <utils/synchronousprocess.h>
+
+#include <QtGui/QMessageBox>
+#include <QtGui/QApplication>
+
+#include <QDebug>
+
+namespace QmlJSEditor {
+namespace Internal {
+
+QmlJSPreviewRunner::QmlJSPreviewRunner(QObject *parent) :
+    QObject(parent)
+{
+    // prepend creator/bin dir to search path (only useful for special creator-qml package)
+    const QString searchPath = QCoreApplication::applicationDirPath()
+                               + Utils::SynchronousProcess::pathSeparator()
+                               + QString(qgetenv("PATH"));
+    m_qmlViewerDefaultPath = Utils::SynchronousProcess::locateBinary(searchPath, QLatin1String("qml"));
+
+    ProjectExplorer::Environment environment = ProjectExplorer::Environment::systemEnvironment();
+    m_applicationLauncher.setEnvironment(environment.toStringList());
+}
+
+
+void QmlJSPreviewRunner::run(const QString &filename)
+{
+    QString errorMessage;
+    if (!filename.isEmpty()) {
+        m_applicationLauncher.start(ProjectExplorer::ApplicationLauncher::Gui, m_qmlViewerDefaultPath,
+                                    QStringList() << filename);
+
+    } else {
+        errorMessage = "No file specified.";
+    }
+
+    if (!errorMessage.isEmpty())
+        QMessageBox::warning(0, tr("Failed to preview Qt Quick file"),
+                             tr("Could not preview Qt Quick (QML) file. Reason: \n%1").arg(errorMessage));
+}
+
+
+} // namespace Internal
+} // namespace QmlJSEditor