92 lines
2.5 KiB
C++
92 lines
2.5 KiB
C++
#pragma once
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#include <QObject>
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#include <QVector>
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#include <QIcon>
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#include <QString>
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/**
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* LayerTreeNode：节点基类（抽象）
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* - 仅包含通用属性：名称/图标/可见性/父子关系
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* - Group / Layer 节点通过继承实现
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* - 提供插入/删除节点的信号通知
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*
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* 说明：
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* - 这里同时维护"树父指针"（m_parentNode）与 QObject parent（可选）
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* - children 由节点自己持有并负责释放（析构时 delete children）
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*/
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class LayerTreeNode : public QObject
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{
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Q_OBJECT
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public:
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enum class Type { Group, Layer };
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explicit LayerTreeNode(const QString& name,
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QObject* parent = nullptr);
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~LayerTreeNode() override;
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LayerTreeNode(const LayerTreeNode&) = delete;
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LayerTreeNode& operator=(const LayerTreeNode&) = delete;
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virtual Type type() const = 0;
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// ---- properties ----
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QString name() const;
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void setName(const QString& name);
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QIcon icon() const;
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void setIcon(const QIcon& icon);
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Qt::CheckState visible() const;
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void setVisible(Qt::CheckState s);
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// ---- tree relations ----
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LayerTreeNode* parentNode() const;
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int rowInParent() const;
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int childCount() const;
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LayerTreeNode* childAt(int row) const;
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const QVector<LayerTreeNode*>& children() const;
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// ---- structure mutation (used by LayerTree / Model) ----
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void appendChild(LayerTreeNode* child);
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void insertChild(int row, LayerTreeNode* child);
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// 基于 QgsLayerTreeNode::removeChildrenPrivate 改进
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// from: 起始索引, count: 移除数量, destroy: true 则 delete 被移除节点
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void removeChild(int from, int count, bool destroy = true);
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// ---- static type helpers ----
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static inline bool isLayer(LayerTreeNode* node)
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{
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return node && node->type() == LayerTreeNode::Type::Layer;
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}
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static inline bool isGroup(LayerTreeNode* node)
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{
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return node && node->type() == LayerTreeNode::Type::Group;
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}
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signals:
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// 在插入子节点之前/之后发出
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void willAddChildren(LayerTreeNode* node, int indexFrom, int indexTo);
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void addedChildren(LayerTreeNode* node, int indexFrom, int indexTo);
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// 在移除子节点之前/之后发出
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void willRemoveChildren(LayerTreeNode* node, int indexFrom, int indexTo);
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void removedChildren(LayerTreeNode* node, int indexFrom, int indexTo);
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void nameChanged(LayerTreeNode* node, const QString& name);
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protected:
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void setParentNode(LayerTreeNode* p);
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private:
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QString m_name;
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QIcon m_icon;
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Qt::CheckState m_visible = Qt::Checked;
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LayerTreeNode* m_parentNode = nullptr;
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QVector<LayerTreeNode*> m_children;
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};
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