itools_gui/
render.rs

1//! 渲染系统模块
2//!
3//! 提供 GUI 渲染功能，包括组件渲染、布局计算和绘制。
4
5use crate::{components::Component, style::Style};
6
7/// 渲染器结构体
8pub struct Renderer {
9    /// 渲染后端
10    backend: Box<dyn RenderBackend>,
11}
12
13/// 渲染后端 trait
14pub trait RenderBackend {
15    /// 初始化渲染后端
16    fn initialize(&mut self) -> Result<(), Box<dyn std::error::Error>>;
17
18    /// 清理渲染后端
19    fn cleanup(&mut self);
20
21    /// 开始渲染帧
22    fn begin_frame(&mut self);
23
24    /// 结束渲染帧
25    fn end_frame(&mut self);
26
27    /// 渲染组件
28    fn render_component(&mut self, component: &Component, x: f32, y: f32, width: f32, height: f32);
29
30    /// 绘制矩形
31    fn draw_rect(&mut self, x: f32, y: f32, width: f32, height: f32, style: &Style);
32
33    /// 绘制文本
34    fn draw_text(&mut self, text: &str, x: f32, y: f32, style: &Style);
35
36    /// 测量文本尺寸
37    fn measure_text(&mut self, text: &str, style: &Style) -> (f32, f32);
38}
39
40impl Renderer {
41    /// 创建新的渲染器
42    ///
43    /// # 参数
44    /// - `backend`: 渲染后端
45    ///
46    /// # 返回值
47    /// 渲染器实例
48    pub fn new(backend: Box<dyn RenderBackend>) -> Self {
49        Self { backend }
50    }
51
52    /// 初始化渲染器
53    ///
54    /// # 返回值
55    /// 初始化结果
56    pub fn initialize(&mut self) -> Result<(), Box<dyn std::error::Error>> {
57        self.backend.initialize()
58    }
59
60    /// 清理渲染器
61    pub fn cleanup(&mut self) {
62        self.backend.cleanup();
63    }
64
65    /// 开始渲染帧
66    pub fn begin_frame(&mut self) {
67        self.backend.begin_frame();
68    }
69
70    /// 结束渲染帧
71    pub fn end_frame(&mut self) {
72        self.backend.end_frame();
73    }
74
75    /// 渲染组件树
76    ///
77    /// # 参数
78    /// - `root`: 根组件
79    /// - `width`: 渲染宽度
80    /// - `height`: 渲染高度
81    pub fn render(&mut self, root: &Component, width: f32, height: f32) {
82        self.begin_frame();
83        self.render_component_recursive(root, 0.0, 0.0, width, height);
84        self.end_frame();
85    }
86
87    /// 递归渲染组件
88    ///
89    /// # 参数
90    /// - `component`: 当前组件
91    /// - `x`: 组件 x 坐标
92    /// - `y`: 组件 y 坐标
93    /// - `width`: 组件宽度
94    /// - `height`: 组件高度
95    fn render_component_recursive(&mut self, component: &Component, x: f32, y: f32, width: f32, height: f32) {
96        if !component.properties().visible {
97            return;
98        }
99
100        // 渲染当前组件
101        self.backend.render_component(component, x, y, width, height);
102
103        // 递归渲染子组件
104        for child in component.children() {
105            // 这里将实现子组件的布局计算
106            // 暂时使用简单的垂直布局
107            let child_y = y + 50.0; // 简单示例，实际需要更复杂的布局计算
108            self.render_component_recursive(child, x + 20.0, child_y, width - 40.0, 40.0);
109        }
110    }
111}
112
113/// 示例渲染后端
114#[derive(Debug)]
115pub struct ExampleRenderBackend {
116    /// 初始化状态
117    initialized: bool,
118}
119
120impl ExampleRenderBackend {
121    /// 创建新的示例渲染后端
122    ///
123    /// # 返回值
124    /// 示例渲染后端实例
125    pub fn new() -> Self {
126        Self { initialized: false }
127    }
128}
129
130impl RenderBackend for ExampleRenderBackend {
131    fn initialize(&mut self) -> Result<(), Box<dyn std::error::Error>> {
132        println!("Initializing example render backend");
133        self.initialized = true;
134        Ok(())
135    }
136
137    fn cleanup(&mut self) {
138        println!("Cleaning up example render backend");
139        self.initialized = false;
140    }
141
142    fn begin_frame(&mut self) {
143        println!("Beginning render frame");
144    }
145
146    fn end_frame(&mut self) {
147        println!("Ending render frame");
148    }
149
150    fn render_component(&mut self, component: &Component, x: f32, y: f32, width: f32, height: f32) {
151        println!("Rendering component {} at ({}, {}, {}, {})", component.id(), x, y, width, height);
152        // 这里将实现实际的组件渲染逻辑
153    }
154
155    fn draw_rect(&mut self, x: f32, y: f32, width: f32, height: f32, _style: &Style) {
156        println!("Drawing rect at ({}, {}, {}, {})", x, y, width, height);
157        // 这里将实现实际的矩形绘制逻辑
158    }
159
160    fn draw_text(&mut self, text: &str, x: f32, y: f32, _style: &Style) {
161        println!("Drawing text '{}' at ({}, {})", text, x, y);
162        // 这里将实现实际的文本绘制逻辑
163    }
164
165    fn measure_text(&mut self, text: &str, _style: &Style) -> (f32, f32) {
166        // 简单示例，返回固定尺寸
167        (text.len() as f32 * 8.0, 16.0)
168    }
169}
itools_gui/render.rs

itools_gui/
render.rs
