Better error handling

src/QGCQmlWidgetHolder.cpp

@@ -25,6 +25,7 @@
 ///     @author Don Gagne <don@thegagnes.com>
 
 #include "QGCQmlWidgetHolder.h"
+#include "QGCMessageBox.h"
 
 QGCQmlWidgetHolder::QGCQmlWidgetHolder(QWidget *parent) :
     QWidget(parent)
@@ -43,8 +44,19 @@ void QGCQmlWidgetHolder::setAutoPilot(AutoPilotPlugin* autoPilot)
     _ui.qmlWidget->rootContext()->setContextProperty("autopilot", autoPilot);
 }
 
-void QGCQmlWidgetHolder::setSource(const QUrl& qmlUrl)
+bool QGCQmlWidgetHolder::setSource(const QUrl& qmlUrl)
 {
     _ui.qmlWidget->setSource(qmlUrl);
-    _ui.qmlWidget->setMinimumSize(_ui.qmlWidget->rootObject()->width(), _ui.qmlWidget->rootObject()->height());
+    if (_ui.qmlWidget->status() != QQuickWidget::Ready) {
+        QString errorList;
+        
+        foreach (QQmlError error, _ui.qmlWidget->errors()) {
+            errorList += error.toString();
+            errorList += "\n";
+        }
+        QGCMessageBox::warning(tr("Qml Error"), tr("Source not ready: %1\nErrors:\n%2").arg(_ui.qmlWidget->status()).arg(errorList));
+        return false;
+    }
+    
+    return true;
 }

src/QGCQmlWidgetHolder.h

@@ -50,7 +50,7 @@ public:
     void setAutoPilot(AutoPilotPlugin* autoPilot);
 
     /// Sets the QML into the control
-    void setSource(const QUrl& qmlUrl);
+    bool setSource(const QUrl& qmlUrl);
 
 private:
     Ui::QGCQmlWidgetHolder _ui;