From ae61b9d35f7a1bce078974524c79328e4b767b78 Mon Sep 17 00:00:00 2001
From: Bruno de Oliveira Abinader <bruno@mapbox.com>
Date: Mon, 11 Jun 2018 22:20:55 +0200
Subject: [Qt] Add QMapboxGL::layerIds()

---
 platform/qt/include/qmapboxgl.hpp |  2 ++
 platform/qt/src/qmapboxgl.cpp     | 17 +++++++++++++++++
 2 files changed, 19 insertions(+)

diff --git a/platform/qt/include/qmapboxgl.hpp b/platform/qt/include/qmapboxgl.hpp
index 79eb672d1f..ac143066e3 100644
--- a/platform/qt/include/qmapboxgl.hpp
+++ b/platform/qt/include/qmapboxgl.hpp
@@ -236,6 +236,8 @@ public:
     bool layerExists(const QString &id);
     void removeLayer(const QString &id);
 
+    QList<QString> layerIds() const;
+
     void setFilter(const QString &layer, const QVariant &filter);
 
     // When rendering on a different thread,
diff --git a/platform/qt/src/qmapboxgl.cpp b/platform/qt/src/qmapboxgl.cpp
index 58158c1822..581a1c4111 100644
--- a/platform/qt/src/qmapboxgl.cpp
+++ b/platform/qt/src/qmapboxgl.cpp
@@ -1465,6 +1465,23 @@ void QMapboxGL::removeLayer(const QString& id)
     d_ptr->mapObj->getStyle().removeLayer(id.toStdString());
 }
 
+/*!
+    List of all existing layer ids from the current style.
+*/
+QList<QString> QMapboxGL::layerIds() const
+{
+    const auto &layers = d_ptr->mapObj->getStyle().getLayers();
+
+    QList<QString> layerIds;
+    layerIds.reserve(layers.size());
+
+    for (const mbgl::style::Layer *layer : layers) {
+        layerIds.append(QString::fromStdString(layer->getID()));
+    }
+
+    return layerIds;
+}
+
 /*!
     Adds the \a image with the identifier \a id that can be used
     later by a symbol layer.
-- 
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