add

1、添加layerTree节点类型：image，然后修改LayerTreeLayer，继承LayerTreeGroup。

HPPA/LayerTreeLayerNode.cpp

@@ -1,7 +1,7 @@
 #include "LayerTreeLayerNode.h"
 
 LayerTreeLayer::LayerTreeLayer(MapLayer* layer, QObject* parent)
-    : LayerTreeNode(layer ? layer->name() : QString(), parent), m_layer(layer)
+    : LayerTreeGroup(layer ? layer->name() : QString(), parent), m_layer(layer)
 {
 }
 

HPPA/LayerTreeLayerNode.h

@@ -1,5 +1,5 @@
 #pragma once
-#include "LayerTreeNode.h"
+#include "LayerTreeGroupNode.h"
 #include "MapLayer.h"
 
 /**
@@ -7,13 +7,13 @@
  * - 基类为 LayerTreeNode
  * - 持有一个 MapLayer 指针（不拥有）
  */
-class LayerTreeLayer : public LayerTreeNode
+class LayerTreeLayer : public LayerTreeGroup
 {
     Q_OBJECT
 public:
     explicit LayerTreeLayer(MapLayer* layer, QObject* parent = nullptr);
 
-    Type type() const override;
+    Type type() const;
 
     void setMapLayer(MapLayer* layer);
     MapLayer* mapLayer() const;

HPPA/LayerTreeNode.h

@@ -19,7 +19,7 @@ class LayerTreeNode : public QObject
 {
     Q_OBJECT
 public:
-    enum class Type { Group, Layer };
+    enum class Type { Group, Layer, Image };
 
     explicit LayerTreeNode(const QString& name,
         QObject* parent = nullptr);