[Qt] Implement pan() method

platform/qt/include/qquickmapboxgl.hpp

@@ -4,6 +4,7 @@
 #include <QGeoCoordinate>
 #include <QGeoServiceProvider>
 #include <QGeoShape>
+#include <QPointF>
 #include <QQuickFramebufferObject>
 
 class QDeclarativeGeoServiceProvider;
@@ -36,6 +37,7 @@ public:
     // QQuickFramebufferObject implementation.
     virtual Renderer *createRenderer() const Q_DECL_FINAL;
 
+    // Map QML Type interface implementation.
     void setPlugin(QDeclarativeGeoServiceProvider *plugin);
     QDeclarativeGeoServiceProvider *plugin() const;
 
@@ -63,14 +65,20 @@ public:
     void setColor(const QColor &color);
     QColor color() const;
 
+    Q_INVOKABLE void pan(int dx, int dy);
+
+    // MapboxGL QML Type interface.
     void setStyle(const QString &style);
     QString style() const;
 
+    QPointF swapPan();
+
     enum SyncState {
         NothingNeedsSync = 0x00,
         ZoomNeedsSync    = 0x01,
         CenterNeedsSync  = 0x02,
         StyleNeedsSync   = 0x04,
+        PanNeedsSync     = 0x08,
     };
 
     int swapSyncState();
@@ -95,6 +103,8 @@ private:
     qreal m_maximumZoomLevel = 20;
     qreal m_zoomLevel = 20;
 
+    QPointF m_pan = QPointF(0, 0);
+
     QGeoCoordinate m_center;
     QGeoShape m_visibleRegion;
 

platform/qt/src/qquickmapboxgl.cpp

@@ -159,6 +159,14 @@ QColor QQuickMapboxGL::color() const
     return QColor();
 }
 
+void QQuickMapboxGL::pan(int dx, int dy)
+{
+    m_pan += QPointF(dx, dy);
+
+    m_syncState |= PanNeedsSync;
+    update();
+}
+
 void QQuickMapboxGL::setStyle(const QString &styleUrl)
 {
     if (m_style == styleUrl) {
@@ -178,6 +186,15 @@ QString QQuickMapboxGL::style() const
     return m_style;
 }
 
+QPointF QQuickMapboxGL::swapPan()
+{
+    QPointF oldPan = m_pan;
+
+    m_pan = QPointF(0, 0);
+
+    return oldPan;
+}
+
 int QQuickMapboxGL::swapSyncState()
 {
     int oldState = m_syncState;

platform/qt/src/qquickmapboxglrenderer.cpp

@@ -61,4 +61,8 @@ void QQuickMapboxGLRenderer::synchronize(QQuickFramebufferObject *item)
     if (syncStatus & QQuickMapboxGL::StyleNeedsSync) {
         m_map->setStyleURL(quickMap->style());
     }
+
+    if (syncStatus & QQuickMapboxGL::PanNeedsSync) {
+        m_map->moveBy(quickMap->swapPan());
+    }
 }