优化LayerTree的数据结构

HPPA/HPPA.cpp

@@ -905,7 +905,7 @@ void HPPA::removeLayerByTreeIndex()
     LayerTreeNode* node = static_cast<LayerTreeNode*>(currentIndexTmp.internalPointer());
     if (!node || node->type() != LayerTreeNode::Type::Layer) return;
 
-    auto* layerNode = static_cast<LayerTreeLayerNode*>(node);
+    auto* layerNode = static_cast<LayerTreeLayer*>(node);
     MapLayer* mapLayer = layerNode->mapLayer();
     QWidget* layerWidget = nullptr;
 
@@ -957,7 +957,7 @@ void HPPA::removeAllLayersInRasterGroup()
 
         if (node->type() != LayerTreeNode::Type::Layer) continue;
 
-        auto* layerNode = static_cast<LayerTreeLayerNode*>(node);
+        auto* layerNode = static_cast<LayerTreeLayer*>(node);
         MapLayer* mapLayer = layerNode->mapLayer();
         QWidget* layerWidget = nullptr;
 
@@ -1572,7 +1572,7 @@ void HPPA::onOpenImg()
 
     RasterLayer* rl = new RasterLayer(baseName, uri);
 
-    auto* layerNode = new LayerTreeLayerNode(rl);
+    auto* layerNode = new LayerTreeLayer(rl);
     m_LayerTreeModel->addLayer(m_RasterGroup, layerNode);
 
 	QWidget* mapcavasContainer = onCreateTab(baseName);
@@ -1722,26 +1722,6 @@ void HPPA::testImagerStatus()
 	m_TestImagerStausThread->start();
 }
 
-void HPPA::onImageFileSaved(QString path, int fileIndex)
-{
-    // 该槽在 UI 线程中执行（Qt 会使用 queued connection），可以安全操作 model
-    QFileInfo fi(path);
-    QString base = fi.completeBaseName(); // 去掉路径与扩展名（例如 tmp_image_0）
-
-    // 将新的 layer 添加到 Raster 分组
-    if (!m_LayerTreeModel || !m_RasterGroup) return;
-
-    // layer 名称可根据需要调整，这里用文件名作为图层名
-    {
-        auto* ln = new LayerTreeLayerNode(nullptr);
-        ln->setName(base);
-        m_LayerTreeModel->addLayer(m_RasterGroup, ln);
-    }
-
-    // 可选：展开 TOC 或者做其他 UI 更新（目前不做动画，仅打印日志）
-    qDebug() << "ImageFileSaved -> add layer:" << base << " index:" << fileIndex;
-}
-
 void HPPA::onAutoExposure()
 {
 	double ReturnedExposureTime = m_Imager->auto_exposure();
@@ -2054,9 +2034,9 @@ void HPPA::onLayerCreatedFromFile(const QString& baseName, const QString& filePa
 	QList<Mapcavas*> mapcavas = mapcavasContainer->findChildren<Mapcavas*>();
 	mapcavas[0]->setLayers(ml);
 
-	auto* layerNode = new LayerTreeLayerNode(ml);
+	auto* layerNode = new LayerTreeLayer(ml);
     LayerTreeNode* node = m_LayerTreeModel->addLayer(m_RasterGroup, layerNode);
-    LayerTreeLayerNode* lnode = dynamic_cast<LayerTreeLayerNode*>(node);
+    LayerTreeLayer* lnode = dynamic_cast<LayerTreeLayer*>(node);
     if (!lnode) return;
 
     // layerNode already holds the MapLayer pointer from constructor
@@ -2085,7 +2065,7 @@ void HPPA::onLayerTreeSelectionChanged(const QItemSelection& selected, const QIt
         return;
     }
 
-    auto* layerNode = static_cast<LayerTreeLayerNode*>(node);
+    auto* layerNode = static_cast<LayerTreeLayer*>(node);
     MapLayer* mapLayer = layerNode->mapLayer();
     if (!mapLayer || mapLayer->layerType() != MapLayer::LayerType::Raster) {
         m_ic->setActiveLayer(nullptr);

HPPA/HPPA.h

@@ -341,8 +341,6 @@ public Q_SLOTS:
 		void onCreated3DModelPlantPhenotype();
 		void onCreated3DModelOneMotor();
 
-		void onImageFileSaved(QString path, int fileIndex);
-
 		void onLayerCreatedFromFile(const QString& baseName, const QString& filePath, int fileIndex);
 		void removeLayerByTreeIndex();
 		void removeAllLayersInRasterGroup();

HPPA/LayerTree.cpp

@@ -1,39 +1,13 @@
 #include "LayerTree.h"
-#include "LayerTreeGroupNode.h"
 
 LayerTree::LayerTree(QObject* parent)
-    : QObject(parent)
+    : LayerTreeGroup("__root__", parent)
 {
-    // root <20><>Ϊ<EFBFBD><CEAA><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD> view <20><><EFBFBD><EFBFBD>ʾ
+    setVisible(Qt::Checked);
-    m_root = new LayerTreeGroupNode("__root__", this);
-    m_root->setVisible(Qt::Checked);
 }
 
 LayerTree::~LayerTree()
 {
-    delete m_root;
-    m_root = nullptr;
-}
-
-LayerTreeNode* LayerTree::root() const
-{
-    return m_root;
-}
-
-LayerTreeNode* LayerTree::insertNode(LayerTreeNode* parent, int row, LayerTreeNode* node)
-{
-    if (!node) return nullptr;
-    if (!parent) parent = m_root;
-
-    if (row < 0) row = parent->childCount();
-    parent->insertChild(row, node);
-    return node;
-}
-
-LayerTreeNode* LayerTree::removeNode(LayerTreeNode* parent, int row)
-{
-    if (!parent) parent = m_root;
-    return parent->takeChild(row);
 }
 
 void LayerTree::setChildrenVisible(LayerTreeNode* n, Qt::CheckState state)

HPPA/LayerTree.h

@@ -1,18 +1,16 @@
 #pragma once
 
-#include <QObject>
+#include "LayerTreeGroupNode.h"
-#include "LayerTreeNode.h"
 
 /**
- * LayerTree<65><65><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>Ŀ¼<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
+ * LayerTree<65><65>ͼ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ڵ<EFBFBD>
- * - <20><><EFBFBD><EFBFBD> root
+ * - <20>̳<EFBFBD><EFBFBD><EFBFBD> LayerTreeGroup<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ĸ<EFBFBD><EFBFBD>ڵ<EFBFBD>
- * - <20>ṩ<EFBFBD><E1B9A9><EFBFBD><EFBFBD>/<2F>Ƴ<EFBFBD><C6B3>ڵ<EFBFBD><DAB5><EFBFBD> API
  * - <20>ṩ<EFBFBD>ɼ<EFBFBD><C9BC>Լ<EFBFBD><D4BC><EFBFBD><EFBFBD>븸<EFBFBD>ڵ<EFBFBD><DAB5><EFBFBD>̬<EFBFBD><CCAC><EFBFBD>µľ<C2B5>̬<EFBFBD><CCAC><EFBFBD><EFBFBD>
  *
  * ע<>⣺beginInsertRows/endInsertRows <20><> Qt Model <20><><EFBFBD><EFBFBD>֪ͨӦ<D6AA><D3A6> Model <20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ã<EFBFBD>
  * LayerTree ֻ<><D6BB><EFBFBD><EFBFBD>ά<EFBFBD><CEAC><EFBFBD><EFBFBD><EFBFBD>ݽṹ<DDBD><E1B9B9>ȷ<EFBFBD>ԡ<EFBFBD>
  */
-class LayerTree : public QObject
+class LayerTree : public LayerTreeGroup
 {
     Q_OBJECT
 public:
@@ -22,28 +20,7 @@ public:
     LayerTree(const LayerTree&) = delete;
     LayerTree& operator=(const LayerTree&) = delete;
 
-    LayerTreeNode* root() const;
-
-    // <20><><EFBFBD>룺parent Ϊ nullptr <20><>ʾ root<6F><74>row=-1 <20><>ʾ append
-    LayerTreeNode* insertNode(LayerTreeNode* parent, int row, LayerTreeNode* node);
-
-    // <20>Ƴ<EFBFBD><C6B3><EFBFBD><EFBFBD><EFBFBD> delete<74><65><EFBFBD><EFBFBD><EFBFBD>ر<EFBFBD><D8B1>Ƴ<EFBFBD><C6B3>ڵ㣨<DAB5><E3A3A8><EFBFBD><EFBFBD><EFBFBD>߸<EFBFBD><DFB8><EFBFBD> delete <20><><EFBFBD><EFBFBD><EFBFBD>²<EFBFBD><C2B2>룩
-    LayerTreeNode* removeNode(LayerTreeNode* parent, int row);
-
     // <20>ɼ<EFBFBD><C9BC><EFBFBD><EFBFBD>߼<EFBFBD><DFBC><EFBFBD><EFBFBD><EFBFBD> Model <20><><EFBFBD>ã<EFBFBD>
     static void setChildrenVisible(LayerTreeNode* n, Qt::CheckState state);
     static void updateParentVisibleFromChildren(LayerTreeNode* parent);
-
-    static inline bool isLayer(LayerTreeNode* node)
-    {
-        return node && node->type() == LayerTreeNode::Type::Layer;
-    }
-
-    static inline bool isGroup(LayerTreeNode* node)
-    {
-        return node && node->type() == LayerTreeNode::Type::Group;
-    }
-
-private:
-    LayerTreeNode* m_root = nullptr; // owned
 };

HPPA/LayerTreeGroupNode.cpp

@@ -1,6 +1,103 @@
 #include "LayerTreeGroupNode.h"
+#include "LayerTreeLayerNode.h"
 
-LayerTreeGroupNode::LayerTreeGroupNode(const QString& name, QObject* parent)
+LayerTreeGroup::LayerTreeGroup(const QString& name, QObject* parent)
     : LayerTreeNode(name, parent)
 {
 }
+
+LayerTreeGroup* LayerTreeGroup::insertGroup(int index, const QString& name)
+{
+    auto* group = new LayerTreeGroup(name);
+    insertChildNode(index, group);
+    return group;
+}
+
+LayerTreeGroup* LayerTreeGroup::addGroup(const QString& name)
+{
+    return insertGroup(childCount(), name);
+}
+
+LayerTreeLayer* LayerTreeGroup::insertLayer(int index, LayerTreeLayer* layer)
+{
+    if (!layer) return nullptr;
+    insertChildNode(index, layer);
+    return layer;
+}
+
+LayerTreeLayer* LayerTreeGroup::addLayer(LayerTreeLayer* layer)
+{
+    return insertLayer(childCount(), layer);
+}
+
+void LayerTreeGroup::insertChildNode(int index, LayerTreeNode* node)
+{
+    insertChild(index, node);
+}
+
+void LayerTreeGroup::addChildNode(LayerTreeNode* node)
+{
+    appendChild(node);
+}
+
+LayerTreeNode* LayerTreeGroup::removeChildNode(LayerTreeNode* node)
+{
+    if (!node) return nullptr;
+    int row = -1;
+    for (int i = 0; i < childCount(); ++i)
+    {
+        if (childAt(i) == node)
+        {
+            row = i;
+            break;
+        }
+    }
+    if (row < 0) return nullptr;
+    removeChild(row, 1, false);
+    return node;
+}
+
+LayerTreeLayer* LayerTreeGroup::findLayer(const QString& name) const
+{
+    const auto layers = findLayers();
+    for (auto* l : layers)
+    {
+        if (l->name() == name)
+            return l;
+    }
+    return nullptr;
+}
+
+QList<LayerTreeLayer*> LayerTreeGroup::findLayers() const
+{
+    QList<LayerTreeLayer*> result;
+    for (int i = 0; i < childCount(); ++i)
+    {
+        LayerTreeNode* child = childAt(i);
+        if (LayerTreeNode::isLayer(child))
+        {
+            result.append(static_cast<LayerTreeLayer*>(child));
+        }
+        else if (LayerTreeNode::isGroup(child))
+        {
+            result.append(static_cast<LayerTreeGroup*>(child)->findLayers());
+        }
+    }
+    return result;
+}
+
+QList<LayerTreeGroup*> LayerTreeGroup::findGroups() const
+{
+    QList<LayerTreeGroup*> result;
+    for (int i = 0; i < childCount(); ++i)
+    {
+        LayerTreeNode* child = childAt(i);
+        if (LayerTreeNode::isGroup(child))
+        {
+            auto* g = static_cast<LayerTreeGroup*>(child);
+            result.append(g);
+            result.append(g->findGroups());
+        }
+    }
+    return result;
+}

HPPA/LayerTreeGroupNode.h

@@ -1,15 +1,44 @@
 #pragma once
 #include "LayerTreeNode.h"
 
-/** Group <20>ڵ<EFBFBD> */
+class LayerTreeLayer;
-class LayerTreeGroupNode : public LayerTreeNode
+
+/**
+ * LayerTreeGroup<75><70>ͼ<EFBFBD><CDBC><EFBFBD><EFBFBD><EFBFBD>ڵ<EFBFBD>
+ * - <20><><EFBFBD><EFBFBD>Ϊ LayerTreeNode
+ * - <20>ṩ<EFBFBD><E1B9A9><EFBFBD><EFBFBD>ͼ<EFBFBD><CDBC><EFBFBD>ڵ㣨LayerTreeLayer<65><72><EFBFBD><EFBFBD>ͼ<EFBFBD><CDBC><EFBFBD>飨LayerTreeGroup<75><70><EFBFBD>ı<EFBFBD><C4B1><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
+ */
+class LayerTreeGroup : public LayerTreeNode
 {
     Q_OBJECT
 public:
-    explicit LayerTreeGroupNode(const QString& name,
+    explicit LayerTreeGroup(const QString& name = QString(),
                             QObject* parent = nullptr);
 
     Type type() const override { return Type::Group; }
 
+    // <20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
+    LayerTreeGroup* insertGroup(int index, const QString& name);
+    LayerTreeGroup* addGroup(const QString& name);
+
+    // <20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ͼ<EFBFBD><CDBC><EFBFBD>ڵ<EFBFBD>
+    LayerTreeLayer* insertLayer(int index, LayerTreeLayer* layer);
+    LayerTreeLayer* addLayer(LayerTreeLayer* layer);
+
+    // <20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ڵ<EFBFBD>
+    void insertChildNode(int index, LayerTreeNode* node);
+    void addChildNode(LayerTreeNode* node);
+
+    // <20>Ƴ<EFBFBD><C6B3>ӽڵ㣨<DAB5><E3A3A8> delete<74><65><EFBFBD><EFBFBD><EFBFBD>ر<EFBFBD><D8B1>Ƴ<EFBFBD><C6B3>ڵ㣩
+    LayerTreeNode* removeChildNode(LayerTreeNode* node);
+
+    // <20><><EFBFBD><EFBFBD>
+    LayerTreeLayer* findLayer(const QString& name) const;
+    QList<LayerTreeLayer*> findLayers() const;
+    QList<LayerTreeGroup*> findGroups() const;
+
     // <20>Ժ<EFBFBD><D4BA><EFBFBD><EFBFBD><EFBFBD>չ<EFBFBD><D5B9>collapsed / groupOpacity <20><>
 };
+
+// <20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
+using LayerTreeGroupNode = LayerTreeGroup;

HPPA/LayerTreeLayerNode.cpp

@@ -1,22 +1,22 @@
 #include "LayerTreeLayerNode.h"
 
-LayerTreeLayerNode::LayerTreeLayerNode(MapLayer* layer, QObject* parent)
+LayerTreeLayer::LayerTreeLayer(MapLayer* layer, QObject* parent)
     : LayerTreeNode(layer ? layer->name() : QString(), parent), m_layer(layer)
 {
 }
 
-LayerTreeNode::Type LayerTreeLayerNode::type() const
+LayerTreeNode::Type LayerTreeLayer::type() const
 { 
     return Type::Layer; 
 }
 
 // <20><><EFBFBD><EFBFBD>һ<EFBFBD><D2BB> MapLayer ָ<>루<EFBFBD><EBA3A8>ӵ<EFBFBD>У<EFBFBD>
-void LayerTreeLayerNode::setMapLayer(MapLayer* layer) 
+void LayerTreeLayer::setMapLayer(MapLayer* layer) 
 { 
     m_layer = layer; 
 }
 
-MapLayer* LayerTreeLayerNode::mapLayer() const 
+MapLayer* LayerTreeLayer::mapLayer() const 
 { 
     return m_layer; 
 }

HPPA/LayerTreeLayerNode.h

@@ -2,16 +2,19 @@
 #include "LayerTreeNode.h"
 #include "MapLayer.h"
 
-/** Layer <20>ڵ<EFBFBD> */
+/**
-class LayerTreeLayerNode : public LayerTreeNode
+ * LayerTreeLayer<EFBFBD><EFBFBD>ͼ<EFBFBD><EFBFBD><EFBFBD>ڵ<EFBFBD>
+ * - <20><><EFBFBD><EFBFBD>Ϊ LayerTreeNode
+ * - <20><><EFBFBD><EFBFBD>һ<EFBFBD><D2BB> MapLayer ָ<>루<EFBFBD><EBA3A8>ӵ<EFBFBD>У<EFBFBD>
+ */
+class LayerTreeLayer : public LayerTreeNode
 {
     Q_OBJECT
 public:
-    explicit LayerTreeLayerNode(MapLayer* layer, QObject* parent = nullptr);
+    explicit LayerTreeLayer(MapLayer* layer, QObject* parent = nullptr);
 
     Type type() const override;
 
-    // <20><><EFBFBD><EFBFBD>һ<EFBFBD><D2BB> MapLayer ָ<>루<EFBFBD><EBA3A8>ӵ<EFBFBD>У<EFBFBD>
     void setMapLayer(MapLayer* layer);
     MapLayer* mapLayer() const;
 
@@ -20,3 +23,6 @@ private:
 
     // <20><><EFBFBD><EFBFBD>չ<EFBFBD><D5B9>layerId / pointer / legendItems <20><>
 };
+
+// <20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
+using LayerTreeLayerNode = LayerTreeLayer;

HPPA/LayerTreeModel.cpp

@@ -28,10 +28,10 @@ QModelIndex LayerTreeModel::index(int row, int column, const QModelIndex& parent
 QModelIndex LayerTreeModel::parent(const QModelIndex& child) const
 {
     LayerTreeNode* node = nodeFromIndex(child);
-    if (!node || node == m_tree->root()) return {};
+    if (!node || node == m_tree) return {};
 
     LayerTreeNode* p = node->parentNode();
-    if (!p || p == m_tree->root()) return {};
+    if (!p || p == m_tree) return {};
 
     return createIndex(p->rowInParent(), 0, p);
 }
@@ -50,7 +50,7 @@ int LayerTreeModel::columnCount(const QModelIndex&) const
 QVariant LayerTreeModel::data(const QModelIndex& index, int role) const
 {
     LayerTreeNode* n = nodeFromIndex(index);
-    if (!n || n == m_tree->root()) return {};
+    if (!n || n == m_tree) return {};
 
     switch (role) {
     case Qt::DisplayRole:
@@ -59,9 +59,9 @@ QVariant LayerTreeModel::data(const QModelIndex& index, int role) const
     case Qt::DecorationRole:
     {
         auto* tmp = nodeFromIndex(index);
-        if (LayerTree::isGroup(tmp))
+        if (LayerTreeNode::isGroup(tmp))
             return QIcon();
-        else if (LayerTree::isLayer(tmp))
+        else if (LayerTreeNode::isLayer(tmp))
         {
             QString basePath = QCoreApplication::applicationDirPath();
             return QIcon(basePath + "/icons/mIconRaster.svg");
@@ -82,7 +82,7 @@ QVariant LayerTreeModel::data(const QModelIndex& index, int role) const
 bool LayerTreeModel::setData(const QModelIndex& index, const QVariant& value, int role)
 {
     LayerTreeNode* n = nodeFromIndex(index);
-    if (!n || n == m_tree->root()) return false;
+    if (!n || n == m_tree) return false;
 
     if (role == Qt::CheckStateRole) {
         auto newState = static_cast<Qt::CheckState>(value.toInt());
@@ -111,39 +111,39 @@ Qt::ItemFlags LayerTreeModel::flags(const QModelIndex& index) const
     if (!index.isValid()) return Qt::NoItemFlags;
 
     LayerTreeNode* n = nodeFromIndex(index);
-    if (!n || n == m_tree->root()) return Qt::NoItemFlags;
+    if (!n || n == m_tree) return Qt::NoItemFlags;
 
     return Qt::ItemIsEnabled | Qt::ItemIsSelectable | Qt::ItemIsUserCheckable;
 }
 
 LayerTreeNode* LayerTreeModel::root() const
 {
-    return m_tree->root();
+    return m_tree;
 }
 
 LayerTreeNode* LayerTreeModel::addGroup(LayerTreeNode* parent, const QString& name, const QIcon& icon)
 {
-    if (!parent) parent = m_tree->root();
+    if (!parent) parent = m_tree;
 
     const int row = parent->childCount();
     beginInsertRows(indexFromNode(parent), row, row);
-    LayerTreeNode* g = m_tree->insertNode(parent, row, new LayerTreeGroupNode(name));
+    LayerTreeNode* g = m_tree->addGroup(name);
     endInsertRows();
 
     return g;
 }
 
-LayerTreeNode* LayerTreeModel::addLayer(LayerTreeNode* parent, LayerTreeLayerNode* layerNode, const QIcon& icon)
+LayerTreeNode* LayerTreeModel::addLayer(LayerTreeNode* parent, LayerTreeLayer* layerNode, const QIcon& icon)
 {
-    if (!parent) parent = m_tree->root();
+    if (!parent) parent = m_tree;
     if (!layerNode) return nullptr;
 
     const int row = parent->childCount();
     beginInsertRows(indexFromNode(parent), row, row);
-    LayerTreeNode* l = m_tree->insertNode(parent, row, layerNode);
+    parent->insertChild(row, layerNode);
     endInsertRows();
 
-    return l;
+    return layerNode;
 }
 
 void LayerTreeModel::setCascadeCheckEnabled(bool enabled)
@@ -159,11 +159,12 @@ bool LayerTreeModel::cascadeCheckEnabled() const
 // <20><><EFBFBD><EFBFBD>ʵ<EFBFBD>֣<EFBFBD><D6A3>Ƴ<EFBFBD><C6B3>ӽڵ㲢<DAB5><E3B2A2> model <20>Ϸ<EFBFBD><CFB7><EFBFBD> begin/endRemoveRows
 LayerTreeNode* LayerTreeModel::removeNode(LayerTreeNode* parent, int row)
 {
-    if (!parent) parent = m_tree->root();
+    if (!parent) parent = m_tree;
     if (row < 0 || row >= parent->childCount()) return nullptr;
 
+    LayerTreeNode* removed = parent->childAt(row);
     beginRemoveRows(indexFromNode(parent), row, row);
-    LayerTreeNode* removed = m_tree->removeNode(parent, row);
+    parent->removeChild(row, 1, false);
     endRemoveRows();
 
     return removed;
@@ -171,12 +172,12 @@ LayerTreeNode* LayerTreeModel::removeNode(LayerTreeNode* parent, int row)
 
 LayerTreeNode* LayerTreeModel::nodeFromIndex(const QModelIndex& index) const
 {
-    if (!index.isValid()) return m_tree->root();
+    if (!index.isValid()) return m_tree;
     return static_cast<LayerTreeNode*>(index.internalPointer());
 }
 
 QModelIndex LayerTreeModel::indexFromNode(LayerTreeNode* n) const
 {
-    if (!n || n == m_tree->root()) return {};
+    if (!n || n == m_tree) return {};
     return createIndex(n->rowInParent(), 0, n);
 }

HPPA/LayerTreeModel.h

@@ -3,7 +3,7 @@
 #include <QAbstractItemModel>
 #include "LayerTree.h"
 
-class LayerTreeLayerNode; // forward declare
+class LayerTreeLayer; // forward declare
 
 /**
  * LayerTreeModel<65><6C>Qt <20><><EFBFBD><EFBFBD><EFBFBD>㣨<EFBFBD><E3A3A8><EFBFBD>ٹ<EFBFBD><D9B9><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
@@ -34,7 +34,7 @@ public:
     LayerTreeNode* root() const;
 
     LayerTreeNode* addGroup(LayerTreeNode* parent, const QString& name, const QIcon& icon = QIcon());
-    LayerTreeNode* addLayer(LayerTreeNode* parent, LayerTreeLayerNode* layerNode, const QIcon& icon = QIcon());
+    LayerTreeNode* addLayer(LayerTreeNode* parent, LayerTreeLayer* layerNode, const QIcon& icon = QIcon());
 
     void setCascadeCheckEnabled(bool enabled);
     bool cascadeCheckEnabled() const;

HPPA/LayerTreeNode.cpp

@@ -20,7 +20,11 @@ QString LayerTreeNode::name() const
 
 void LayerTreeNode::setName(const QString& name) 
 {
+    if (m_name != name)
+    {
         m_name = name;
+        emit nameChanged(this, name);
+    }
 }
 
 QIcon LayerTreeNode::icon() const 
@@ -97,14 +101,35 @@ void LayerTreeNode::insertChild(int row, LayerTreeNode* child)
     if (row < 0 || row > m_children.size())
         row = m_children.size();
 
+    emit willAddChildren(this, row, row);
     child->setParentNode(this);
     m_children.insert(row, child);
+    emit addedChildren(this, row, row);
 }
 
-LayerTreeNode* LayerTreeNode::takeChild(int row)
+void LayerTreeNode::removeChild(int from, int count, bool destroy)
 {
-    if (row < 0 || row >= m_children.size()) return nullptr;
+    if (from < 0 || count <= 0 || from + count > m_children.size()) return;
-    LayerTreeNode* taken = m_children.takeAt(row);
+
-    if (taken) taken->setParentNode(nullptr);
+    emit willRemoveChildren(this, from, from + count - 1);
-    return taken;
+
+    QVector<LayerTreeNode*> removed;
+    removed.reserve(count);
+    for (int i = 0; i < count; ++i)
+    {
+        removed.append(m_children.at(from));
+        m_children.removeAt(from);
+    }
+
+    for (LayerTreeNode* node : removed)
+    {
+        node->setParentNode(nullptr);
+    }
+
+    emit removedChildren(this, from, from + count - 1);
+
+    if (destroy)
+    {
+        qDeleteAll(removed);
+    }
 }

HPPA/LayerTreeNode.h

@@ -9,9 +9,10 @@
  * LayerTreeNode<64><65><EFBFBD>ڵ<EFBFBD><DAB5><EFBFBD><EFBFBD>ࣨ<EFBFBD><E0A3A8><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
  * - <20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ͨ<EFBFBD><CDA8><EFBFBD><EFBFBD><EFBFBD>ԣ<EFBFBD><D4A3><EFBFBD><EFBFBD><EFBFBD>/ͼ<><CDBC>/<2F>ɼ<EFBFBD><C9BC><EFBFBD>/<2F><><EFBFBD>ӹ<EFBFBD>ϵ
  * - Group / Layer <20>ڵ<EFBFBD>ͨ<EFBFBD><CDA8><EFBFBD>̳<EFBFBD>ʵ<EFBFBD><CAB5>
+ * - <20>ṩ<EFBFBD><E1B9A9><EFBFBD><EFBFBD>/ɾ<><C9BE><EFBFBD>ڵ<EFBFBD><DAB5><EFBFBD><EFBFBD>ź<EFBFBD>֪ͨ
  *
  * ˵<><CBB5><EFBFBD><EFBFBD>
- * - <20><><EFBFBD><EFBFBD>ͬʱά<CAB1><CEAC><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ָ<EFBFBD>롱<EFBFBD><EFBFBD>m_parentNode<EFBFBD><EFBFBD><EFBFBD><EFBFBD> QObject parent<6E><74><EFBFBD><EFBFBD>ѡ<EFBFBD><D1A1>
+ * - <20><><EFBFBD><EFBFBD>ͬʱά<CAB1><CEAC>"<EFBFBD><EFBFBD><EFBFBD><EFBFBD>ָ<EFBFBD><EFBFBD>"<EFBFBD><EFBFBD>m_parentNode<EFBFBD><EFBFBD><EFBFBD><EFBFBD> QObject parent<6E><74><EFBFBD><EFBFBD>ѡ<EFBFBD><D1A1>
  * - children <20>ɽڵ<C9BD><DAB5>Լ<EFBFBD><D4BC><EFBFBD><EFBFBD>в<EFBFBD><D0B2><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ͷţ<CDB7><C5A3><EFBFBD><EFBFBD><EFBFBD>ʱ delete children<65><6E>
  */
 class LayerTreeNode : public QObject
@@ -50,7 +51,32 @@ public:
     // ---- structure mutation (used by LayerTree / Model) ----
     void appendChild(LayerTreeNode* child);
     void insertChild(int row, LayerTreeNode* child);
-    LayerTreeNode* takeChild(int row); // remove but not delete
+
+    // <20><><EFBFBD><EFBFBD> QgsLayerTreeNode::removeChildrenPrivate <20>Ľ<EFBFBD>
+    // from: <20><>ʼ<EFBFBD><CABC><EFBFBD><EFBFBD>, count: <20>Ƴ<EFBFBD><C6B3><EFBFBD><EFBFBD><EFBFBD>, destroy: true <20><> delete <20><><EFBFBD>Ƴ<EFBFBD><C6B3>ڵ<EFBFBD>
+    void removeChild(int from, int count, bool destroy = true);
+
+    // ---- static type helpers ----
+    static inline bool isLayer(LayerTreeNode* node)
+    {
+        return node && node->type() == LayerTreeNode::Type::Layer;
+    }
+
+    static inline bool isGroup(LayerTreeNode* node)
+    {
+        return node && node->type() == LayerTreeNode::Type::Group;
+    }
+
+signals:
+    // <20>ڲ<EFBFBD><DAB2><EFBFBD><EFBFBD>ӽڵ<D3BD>֮ǰ/֮<>󷢳<EFBFBD>
+    void willAddChildren(LayerTreeNode* node, int indexFrom, int indexTo);
+    void addedChildren(LayerTreeNode* node, int indexFrom, int indexTo);
+
+    // <20><><EFBFBD>Ƴ<EFBFBD><C6B3>ӽڵ<D3BD>֮ǰ/֮<>󷢳<EFBFBD>
+    void willRemoveChildren(LayerTreeNode* node, int indexFrom, int indexTo);
+    void removedChildren(LayerTreeNode* node, int indexFrom, int indexTo);
+
+    void nameChanged(LayerTreeNode* node, const QString& name);
 
 protected:
     void setParentNode(LayerTreeNode* p);