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https://github.com/GeWuYou/GFramework.git
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38020c32a2
- 新增 GFramework.SourceGenerators 主文档，介绍编译时代码生成工具 - 详细说明 Log 属性生成器的使用方法和配置选项 - 完整描述 ContextAware 属性生成器的功能和测试场景配置 - 添加 GenerateEnumExtensions 属性生成器文档和使用示例 - 介绍 GetNode 生成器（Godot 专用）的节点获取功能 - 新增 BindNodeSignal 生成器文档，说明信号绑定与解绑机制 - 提供 Context Get 注入生成器的完整使用指南 - 添加诊断信息章节，涵盖所有生成器的错误提示和解决方案 - 包含性能优势对比和基准测试结果 - 提供多个完整使用示例，展示实际应用场景 - 整理最佳实践和常见问题解答 - 添加 BindNodeSignal 生成器专用文档，详细介绍其高级用法
681 lines
17 KiB
Markdown
681 lines
17 KiB
Markdown
# BindNodeSignal 生成器
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> 自动生成 Godot 节点信号绑定与解绑逻辑，消除事件订阅样板代码
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## 概述
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BindNodeSignal 生成器为标记了 `[BindNodeSignal]` 特性的方法自动生成节点事件绑定和解绑代码。它将 `_Ready()` 和
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`_ExitTree()` 中重复的 `+=` 和 `-=` 样板代码收敛到生成器中统一维护。
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### 核心功能
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- **自动事件绑定**：在 `_Ready()` 中自动订阅节点事件
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- **自动事件解绑**：在 `_ExitTree()` 中自动取消订阅
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- **多事件绑定**：一个方法可以绑定到多个节点事件
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- **类型安全检查**：编译时验证方法签名与事件委托的兼容性
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- **与 GetNode 集成**：无缝配合 `[GetNode]` 特性使用
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## 基础使用
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### 标记事件处理方法
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使用 `[BindNodeSignal]` 特性标记处理节点事件的方法：
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```csharp
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using GFramework.Godot.SourceGenerators.Abstractions;
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using Godot;
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public partial class MainMenu : Control
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{
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private Button _startButton = null!;
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private Button _settingsButton = null!;
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private Button _quitButton = null!;
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[BindNodeSignal(nameof(_startButton), nameof(Button.Pressed))]
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private void OnStartButtonPressed()
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{
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StartGame();
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}
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[BindNodeSignal(nameof(_settingsButton), nameof(Button.Pressed))]
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private void OnSettingsButtonPressed()
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{
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ShowSettings();
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}
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[BindNodeSignal(nameof(_quitButton), nameof(Button.Pressed))]
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private void OnQuitButtonPressed()
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{
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QuitGame();
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}
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public override void _Ready()
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{
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__BindNodeSignals_Generated();
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}
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public override void _ExitTree()
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{
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__UnbindNodeSignals_Generated();
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}
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}
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```
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### 生成的代码
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编译器会为标记的类自动生成以下代码：
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```csharp
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// <auto-generated />
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#nullable enable
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namespace YourNamespace;
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partial class MainMenu
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{
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private void __BindNodeSignals_Generated()
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{
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_startButton.Pressed += OnStartButtonPressed;
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_settingsButton.Pressed += OnSettingsButtonPressed;
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_quitButton.Pressed += OnQuitButtonPressed;
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}
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private void __UnbindNodeSignals_Generated()
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{
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_startButton.Pressed -= OnStartButtonPressed;
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_settingsButton.Pressed -= OnSettingsButtonPressed;
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_quitButton.Pressed -= OnQuitButtonPressed;
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}
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}
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```
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## 参数说明
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`[BindNodeSignal]` 特性需要两个参数：
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| 参数 | 类型 | 说明 |
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|-----------------|--------|-----------------------------|
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| `nodeFieldName` | string | 目标节点字段名（使用 `nameof` 推荐） |
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| `signalName` | string | 目标节点上的 CLR 事件名（使用 `nameof`） |
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```csharp
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[BindNodeSignal("_startButton", "Pressed")] // 字符串字面量
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[BindNodeSignal(nameof(_startButton), nameof(Button.Pressed))] // 推荐：nameof 表达式
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```
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## 高级用法
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### 带参数的事件处理
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处理带参数的事件（如 `SpinBox.ValueChanged`）：
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```csharp
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using Godot;
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public partial class SettingsPanel : Control
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{
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private SpinBox _volumeSpinBox = null!;
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private SpinBox _brightnessSpinBox = null!;
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// 参数类型必须与事件委托匹配
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[BindNodeSignal(nameof(_volumeSpinBox), nameof(SpinBox.ValueChanged))]
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private void OnVolumeChanged(double value)
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{
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SetVolume((float)value);
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}
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[BindNodeSignal(nameof(_brightnessSpinBox), nameof(SpinBox.ValueChanged))]
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private void OnBrightnessChanged(double value)
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{
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SetBrightness((float)value);
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}
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public override void _Ready()
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{
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__BindNodeSignals_Generated();
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}
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public override void _ExitTree()
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{
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__UnbindNodeSignals_Generated();
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}
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}
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```
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### 多事件绑定
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一个方法可以同时绑定到多个节点的事件：
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```csharp
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public partial class MultiButtonHud : Control
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{
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private Button _buttonA = null!;
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private Button _buttonB = null!;
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private Button _buttonC = null!;
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// 一个方法处理多个按钮的点击
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[BindNodeSignal(nameof(_buttonA), nameof(Button.Pressed))]
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[BindNodeSignal(nameof(_buttonB), nameof(Button.Pressed))]
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[BindNodeSignal(nameof(_buttonC), nameof(Button.Pressed))]
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private void OnAnyButtonPressed()
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{
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PlayClickSound();
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}
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public override void _Ready()
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{
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__BindNodeSignals_Generated();
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}
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public override void _ExitTree()
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{
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__UnbindNodeSignals_Generated();
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}
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}
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```
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### 与 [GetNode] 组合使用
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推荐与 `[GetNode]` 特性结合使用：
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```csharp
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using GFramework.Godot.SourceGenerators.Abstractions;
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using Godot;
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public partial class GameHud : Control
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{
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// 使用 GetNode 自动获取节点
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[GetNode]
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private Button _pauseButton = null!;
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[GetNode]
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private ProgressBar _healthBar = null!;
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[GetNode("UI/ScoreLabel")]
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private Label _scoreLabel = null!;
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// 使用 BindNodeSignal 绑定事件
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[BindNodeSignal(nameof(_pauseButton), nameof(Button.Pressed))]
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private void OnPauseButtonPressed()
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{
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TogglePause();
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}
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// 多事件绑定示例
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[BindNodeSignal(nameof(_healthBar), nameof(Range.ValueChanged))]
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private void OnHealthChanged(double value)
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{
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UpdateHealthDisplay(value);
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}
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public override void _Ready()
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{
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// 先注入节点，再绑定信号
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__InjectGetNodes_Generated();
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__BindNodeSignals_Generated();
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}
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public override void _ExitTree()
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{
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__UnbindNodeSignals_Generated();
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}
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}
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```
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### 复杂事件处理场景
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实现完整的 UI 事件处理：
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```csharp
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public partial class InventoryUI : Control
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{
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// 节点
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[GetNode]
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private ItemList _itemList = null!;
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[GetNode]
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private Button _useButton = null!;
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[GetNode]
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private Button _dropButton = null!;
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[GetNode]
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private LineEdit _searchBox = null!;
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// 事件处理
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[BindNodeSignal(nameof(_itemList), nameof(ItemList.ItemSelected))]
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private void OnItemSelected(long index)
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{
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SelectItem((int)index);
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}
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[BindNodeSignal(nameof(_itemList), nameof(ItemList.ItemActivated))]
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private void OnItemActivated(long index)
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{
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UseItem((int)index);
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}
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[BindNodeSignal(nameof(_useButton), nameof(Button.Pressed))]
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private void OnUseButtonPressed()
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{
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UseSelectedItem();
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}
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[BindNodeSignal(nameof(_dropButton), nameof(Button.Pressed))]
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private void OnDropButtonPressed()
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{
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DropSelectedItem();
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}
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[BindNodeSignal(nameof(_searchBox), nameof(LineEdit.TextChanged))]
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private void OnSearchTextChanged(string newText)
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{
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FilterItems(newText);
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}
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public override void _Ready()
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{
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__InjectGetNodes_Generated();
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__BindNodeSignals_Generated();
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InitializeInventory();
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}
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public override void _ExitTree()
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{
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__UnbindNodeSignals_Generated();
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}
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}
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```
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## 生命周期管理
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### 自动生成生命周期方法
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如果类没有 `_Ready()` 或 `_ExitTree()`，生成器会自动生成：
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```csharp
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public partial class AutoLifecycleHud : Control
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{
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private Button _button = null!;
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[BindNodeSignal(nameof(_button), nameof(Button.Pressed))]
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private void OnButtonPressed()
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{
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// 处理点击
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}
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// 无需手动声明 _Ready 和 _ExitTree
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// 生成器会自动生成：
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// public override void _Ready() { __BindNodeSignals_Generated(); }
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// public override void _ExitTree() { __UnbindNodeSignals_Generated(); }
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}
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```
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### 手动生命周期调用
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如果已有生命周期方法，需要手动调用生成的方法：
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```csharp
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public partial class CustomLifecycleHud : Control
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{
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private Button _button = null!;
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[BindNodeSignal(nameof(_button), nameof(Button.Pressed))]
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private void OnButtonPressed()
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{
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HandlePress();
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}
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public override void _Ready()
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{
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// 必须手动调用绑定方法
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__BindNodeSignals_Generated();
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// 自定义初始化逻辑
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InitializeUI();
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}
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public override void _ExitTree()
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{
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// 必须手动调用解绑方法
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__UnbindNodeSignals_Generated();
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// 自定义清理逻辑
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CleanupResources();
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}
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}
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```
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**注意**：如果在 `_Ready()` 中不调用 `__BindNodeSignals_Generated()`，编译器会发出警告 `GF_Godot_BindNodeSignal_008`。
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## 诊断信息
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生成器会在以下情况报告编译错误或警告：
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### GF_Godot_BindNodeSignal_001 - 不支持嵌套类
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**错误信息**：`Class '{ClassName}' cannot use [BindNodeSignal] inside a nested type`
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**解决方案**：将嵌套类提取为独立的类
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```csharp
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// ❌ 错误
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public partial class Outer
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{
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public partial class Inner
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{
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[BindNodeSignal(nameof(_button), nameof(Button.Pressed))]
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private void OnPressed() { } // 错误
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}
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}
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// ✅ 正确
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public partial class Inner
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{
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[BindNodeSignal(nameof(_button), nameof(Button.Pressed))]
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private void OnPressed() { }
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}
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```
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### GF_Godot_BindNodeSignal_002 - 不支持静态方法
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**错误信息**：`Method '{MethodName}' cannot be static when using [BindNodeSignal]`
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**解决方案**：改为实例方法
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```csharp
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// ❌ 错误
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[BindNodeSignal(nameof(_button), nameof(Button.Pressed))]
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private static void OnPressed() { }
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// ✅ 正确
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[BindNodeSignal(nameof(_button), nameof(Button.Pressed))]
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private void OnPressed() { }
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```
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### GF_Godot_BindNodeSignal_003 - 节点字段不存在
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**错误信息**：
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`Method '{MethodName}' references node field '{FieldName}', but no matching field exists on class '{ClassName}'`
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**解决方案**：确保引用的字段存在且名称正确
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```csharp
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// ❌ 错误：_button 字段不存在
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[BindNodeSignal(nameof(_button), nameof(Button.Pressed))]
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private void OnPressed() { }
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// ✅ 正确
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private Button _button = null!;
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[BindNodeSignal(nameof(_button), nameof(Button.Pressed))]
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private void OnPressed() { }
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```
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### GF_Godot_BindNodeSignal_004 - 节点字段必须是实例字段
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**错误信息**：`Method '{MethodName}' references node field '{FieldName}', but that field must be an instance field`
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**解决方案**：将节点字段改为实例字段（非静态）
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```csharp
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// ❌ 错误
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private static Button _button = null!;
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// ✅ 正确
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private Button _button = null!;
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```
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### GF_Godot_BindNodeSignal_005 - 字段类型必须继承自 Godot.Node
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**错误信息**：`Field '{FieldName}' must be a Godot.Node type to use [BindNodeSignal]`
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**解决方案**：确保字段类型继承自 `Godot.Node`
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```csharp
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// ❌ 错误
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private string _text = null!; // string 不是 Node 类型
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[BindNodeSignal(nameof(_text), "Changed")] // 错误
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// ✅ 正确
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private Button _button = null!; // Button 继承自 Node
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[BindNodeSignal(nameof(_button), nameof(Button.Pressed))]
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```
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### GF_Godot_BindNodeSignal_006 - 目标事件不存在
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**错误信息**：`Field '{FieldName}' does not contain an event named '{EventName}'`
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**解决方案**：确保事件名称正确
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```csharp
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private Button _button = null!;
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// ❌ 错误：Click 不是 Button 的事件
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[BindNodeSignal(nameof(_button), "Click")]
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// ✅ 正确：使用正确的事件名
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[BindNodeSignal(nameof(_button), nameof(Button.Pressed))]
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```
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### GF_Godot_BindNodeSignal_007 - 方法签名不兼容
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**错误信息**：`Method '{MethodName}' is not compatible with event '{EventName}' on field '{FieldName}'`
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**解决方案**：确保方法签名与事件委托匹配
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```csharp
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private SpinBox _spinBox = null!;
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// ❌ 错误：SpinBox.ValueChanged 需要 double 参数
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[BindNodeSignal(nameof(_spinBox), nameof(SpinBox.ValueChanged))]
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private void OnValueChanged() { } // 缺少参数
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// ✅ 正确
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[BindNodeSignal(nameof(_spinBox), nameof(SpinBox.ValueChanged))]
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private void OnValueChanged(double value) { }
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```
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### GF_Godot_BindNodeSignal_008 - 需要在 _Ready 中调用绑定方法
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**警告信息**：
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`Class '{ClassName}' defines _Ready(); call __BindNodeSignals_Generated() there to bind [BindNodeSignal] handlers`
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**解决方案**：在 `_Ready()` 中手动调用 `__BindNodeSignals_Generated()`
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```csharp
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public override void _Ready()
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{
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__BindNodeSignals_Generated(); // ✅ 必须手动调用
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// 其他初始化...
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}
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```
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### GF_Godot_BindNodeSignal_009 - 需要在 _ExitTree 中调用解绑方法
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**警告信息**：
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`Class '{ClassName}' defines _ExitTree(); call __UnbindNodeSignals_Generated() there to unbind [BindNodeSignal] handlers`
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**解决方案**：在 `_ExitTree()` 中手动调用 `__UnbindNodeSignals_Generated()`
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```csharp
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public override void _ExitTree()
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{
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__UnbindNodeSignals_Generated(); // ✅ 必须手动调用
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// 其他清理...
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}
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```
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### GF_Godot_BindNodeSignal_010 - 构造参数无效
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**错误信息**：
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`Method '{MethodName}' uses [BindNodeSignal] with an invalid '{ParameterName}' constructor argument; it must be a non-empty string literal`
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**解决方案**：使用有效的字符串字面量或 nameof 表达式
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```csharp
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// ❌ 错误：空字符串
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[BindNodeSignal("", nameof(Button.Pressed))]
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// ❌ 错误：null 值
|
||
[BindNodeSignal(null, nameof(Button.Pressed))]
|
||
|
||
// ✅ 正确
|
||
[BindNodeSignal(nameof(_button), nameof(Button.Pressed))]
|
||
```
|
||
|
||
## 最佳实践
|
||
|
||
### 1. 使用 nameof 表达式
|
||
|
||
使用 `nameof` 而不是字符串字面量，以获得重构支持和编译时检查：
|
||
|
||
```csharp
|
||
// ❌ 不推荐：字符串字面量
|
||
[BindNodeSignal("_button", "Pressed")]
|
||
|
||
// ✅ 推荐：nameof 表达式
|
||
[BindNodeSignal(nameof(_button), nameof(Button.Pressed))]
|
||
```
|
||
|
||
### 2. 保持方法命名一致
|
||
|
||
使用统一的命名约定提高代码可读性：
|
||
|
||
```csharp
|
||
// ✅ 推荐：On + 节点名 + 事件名
|
||
[BindNodeSignal(nameof(_startButton), nameof(Button.Pressed))]
|
||
private void OnStartButtonPressed() { }
|
||
|
||
[BindNodeSignal(nameof(_volumeSlider), nameof(Slider.ValueChanged))]
|
||
private void OnVolumeSliderValueChanged(double value) { }
|
||
```
|
||
|
||
### 3. 分组相关事件处理
|
||
|
||
将相关的事件处理方法放在一起，便于维护：
|
||
|
||
```csharp
|
||
public partial class GameHud : Control
|
||
{
|
||
// UI 节点
|
||
[GetNode]
|
||
private Button _pauseButton = null!;
|
||
|
||
[GetNode]
|
||
private Button _menuButton = null!;
|
||
|
||
// UI 事件处理（放在一起）
|
||
[BindNodeSignal(nameof(_pauseButton), nameof(Button.Pressed))]
|
||
private void OnPauseButtonPressed() { }
|
||
|
||
[BindNodeSignal(nameof(_menuButton), nameof(Button.Pressed))]
|
||
private void OnMenuButtonPressed() { }
|
||
}
|
||
```
|
||
|
||
### 4. 正确处理生命周期
|
||
|
||
始终确保事件解绑，避免内存泄漏：
|
||
|
||
```csharp
|
||
public partial class SafeHud : Control
|
||
{
|
||
private Button _button = null!;
|
||
|
||
[BindNodeSignal(nameof(_button), nameof(Button.Pressed))]
|
||
private void OnButtonPressed() { }
|
||
|
||
public override void _Ready()
|
||
{
|
||
__BindNodeSignals_Generated();
|
||
}
|
||
|
||
public override void _ExitTree()
|
||
{
|
||
// 确保解绑事件
|
||
__UnbindNodeSignals_Generated();
|
||
}
|
||
}
|
||
```
|
||
|
||
### 5. 对比手动事件绑定
|
||
|
||
| 方式 | 代码量 | 可维护性 | 错误风险 | 推荐场景 |
|
||
|--------------------|-----|------|----------|------------|
|
||
| 手动 `+=` / `-=` | 多 | 中 | 高（易遗漏解绑） | 简单场景 |
|
||
| `[BindNodeSignal]` | 少 | 高 | 低（编译器检查） | 复杂 UI、频繁事件 |
|
||
|
||
```csharp
|
||
// ❌ 不推荐：手动绑定
|
||
public override void _Ready()
|
||
{
|
||
_startButton.Pressed += OnStartButtonPressed;
|
||
_settingsButton.Pressed += OnSettingsButtonPressed;
|
||
_quitButton.Pressed += OnQuitButtonPressed;
|
||
}
|
||
|
||
public override void _ExitTree()
|
||
{
|
||
// 容易遗漏解绑
|
||
_startButton.Pressed -= OnStartButtonPressed;
|
||
_quitButton.Pressed -= OnQuitButtonPressed; // 遗漏了 _settingsButton
|
||
}
|
||
|
||
// ✅ 推荐：使用 [BindNodeSignal]
|
||
[BindNodeSignal(nameof(_startButton), nameof(Button.Pressed))]
|
||
private void OnStartButtonPressed() { }
|
||
|
||
[BindNodeSignal(nameof(_settingsButton), nameof(Button.Pressed))]
|
||
private void OnSettingsButtonPressed() { }
|
||
|
||
[BindNodeSignal(nameof(_quitButton), nameof(Button.Pressed))]
|
||
private void OnQuitButtonPressed() { }
|
||
```
|
||
|
||
### 6. 与 [ContextAware] 组合使用
|
||
|
||
在需要架构访问的场景中，与 `[ContextAware]` 结合：
|
||
|
||
```csharp
|
||
using GFramework.SourceGenerators.Abstractions.Rule;
|
||
using GFramework.Godot.SourceGenerators.Abstractions;
|
||
|
||
[ContextAware]
|
||
public partial class GameController : Node
|
||
{
|
||
[GetNode]
|
||
private Button _actionButton = null!;
|
||
|
||
private IGameModel _gameModel = null!;
|
||
|
||
[BindNodeSignal(nameof(_actionButton), nameof(Button.Pressed))]
|
||
private void OnActionButtonPressed()
|
||
{
|
||
// 可以直接使用架构功能
|
||
this.SendCommand(new PlayerActionCommand());
|
||
}
|
||
|
||
public override void _Ready()
|
||
{
|
||
__InjectContextBindings_Generated();
|
||
__InjectGetNodes_Generated();
|
||
__BindNodeSignals_Generated();
|
||
}
|
||
|
||
public override void _ExitTree()
|
||
{
|
||
__UnbindNodeSignals_Generated();
|
||
}
|
||
}
|
||
```
|
||
|
||
## 相关文档
|
||
|
||
- [Source Generators 概述](./index)
|
||
- [GetNode 生成器](./get-node-generator)
|
||
- [ContextAware 生成器](./context-aware-generator)
|
||
- [Godot 信号文档](https://docs.godotengine.org/en/stable/classes/class_signal.html)
|