From 769dcb1454126ad2a8b199a273543d9cf71daa8d Mon Sep 17 00:00:00 2001
From: Automatic Release Builder <build@flightgear.org>
Date: Sun, 6 Dec 2020 18:45:44 +0000
Subject: [PATCH] =?UTF-8?q?Launcher:=20FlightPlann:=20fix=20=E2=80=98view?=
 =?UTF-8?q?=20route=E2=80=99=20enable?=
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

---
 src/GUI/FlightPlanController.cxx | 12 ++++++++++++
 src/GUI/qml/FlightPlan.qml       |  1 +
 2 files changed, 13 insertions(+)

diff --git a/src/GUI/FlightPlanController.cxx b/src/GUI/FlightPlanController.cxx
index 7e8b8ca6f..02fcaffcb 100644
--- a/src/GUI/FlightPlanController.cxx
+++ b/src/GUI/FlightPlanController.cxx
@@ -32,12 +32,15 @@ const int LegAltitudeTypeRole = Qt::UserRole + 8;
 class LegsModel : public QAbstractListModel
 {
     Q_OBJECT
+
+    Q_PROPERTY(int numLegs READ numLegs NOTIFY numLegsChanged)
 public:
     void setFlightPlan(flightgear::FlightPlanRef f)
     {
         beginResetModel();
         _fp = f;
         endResetModel();
+        emit numLegsChanged();
     }
 
     int rowCount(const QModelIndex &parent) const override
@@ -132,6 +135,7 @@ public:
     {
         beginResetModel();
         endResetModel();
+        numLegsChanged();
     }
 
     QHash<int, QByteArray> roleNames() const override
@@ -152,6 +156,14 @@ public:
         return result;
     }
 
+    int numLegs() const
+    {
+        return _fp->numLegs();
+    }
+
+signals:
+    void numLegsChanged();
+
 private:
     flightgear::FlightPlanRef _fp;
 };
diff --git a/src/GUI/qml/FlightPlan.qml b/src/GUI/qml/FlightPlan.qml
index 13d287318..af1051fef 100644
--- a/src/GUI/qml/FlightPlan.qml
+++ b/src/GUI/qml/FlightPlan.qml
@@ -322,6 +322,7 @@ Item {
 
                 Button {
                     text: qsTr("View route")
+                    enabled: _launcher.flightPlan.legs.numLegs > 0
                     onClicked: {
                         detailLoader.airportGuid = 0
                         detailLoader.sourceComponent = routeDetails;