orbtk_theming/config/
theme_config.rs

1use std::collections::HashMap;
2
3use ron::{de::from_str, Value};
4use serde_derive::{Deserialize, Serialize};
5
6use crate::{config::StyleConfig, Selector};
7
8pub static BASE_STYLE: &str = "base";
9pub static RESOURCE_KEY: &str = "$";
10
11// Used to store and read properties that could be requested by a given property name and a selector.
12#[derive(Default, Clone, Debug, Serialize, Deserialize)]
13#[serde(rename = "Theme")]
14pub struct ThemeConfig {
15    #[serde(default)]
16    pub styles: HashMap<String, StyleConfig>,
17    #[serde(default)]
18    pub resources: HashMap<String, Value>,
19}
20
21impl<'a> ThemeConfig {
22    /// Extends the given theme with a other theme. Replaces the current name with name of other.
23    /// If a style with the same key is on other, it will replace the style in the current theme.
24    pub fn extend(mut self, other: ThemeConfig) -> Self {
25        let mut other = other;
26
27        for style in other.styles.drain() {
28            self.styles.insert(style.0, style.1);
29        }
30
31        for resource in other.resources.drain() {
32            self.resources.insert(resource.0, resource.1);
33        }
34
35        self
36    }
37
38    /// Gets a property by the given name and a selector.
39    pub fn property(&'a self, property: &str, selector: &Selector) -> Option<Value> {
40        if let Some(style) = &selector.style {
41            if let Some(style) = self.styles.get(style) {
42                return self.get_property(property, style, selector);
43            }
44        }
45
46        // if there is no style read value from base style.
47        if let Some(base_style) = self.styles.get(BASE_STYLE) {
48            return self.get_property(property, base_style, selector);
49        }
50
51        None
52    }
53
54    fn get_property(
55        &'a self,
56        property: &str,
57        style: &'a StyleConfig,
58        selector: &Selector,
59    ) -> Option<Value> {
60        // state properties has the most priority
61        if let Some(state) = &selector.state {
62            if let Some(properties) = style.states.get(state) {
63                return self.get_property_value(property, properties);
64            }
65
66            // load state properties from based style if there are no other states (recursive through base style).
67            if style.base.is_empty() {
68                return None;
69            }
70
71            if let Some(base_style) = self.styles.get(&style.base) {
72                if let Some(properties) = base_style.states.get(state) {
73                    return self.get_property_value(property, properties);
74                }
75            }
76        }
77
78        let value = self.get_property_value(property, &style.properties);
79
80        if value.is_some() {
81            return value;
82        }
83
84        // load properties from based style if there are no other states (recursive through base style).
85        if style.base.is_empty() {
86            return None;
87        }
88
89        if let Some(base_style) = self.styles.get(&style.base) {
90            return self.get_property(property, base_style, selector);
91        }
92
93        None
94    }
95
96    fn get_property_value(
97        &self,
98        property: &str,
99        properties: &'a HashMap<String, Value>,
100    ) -> Option<Value> {
101        let property = properties.get(property)?;
102
103        // load from resources if the value is a key.
104        if let Ok(key) = property.clone().into_rust::<String>() {
105            if key.starts_with(RESOURCE_KEY) {
106                return Some(self.resources.get(&key.replace(RESOURCE_KEY, ""))?.clone());
107            }
108        }
109
110        Some(property.clone())
111    }
112}
113
114impl From<&str> for ThemeConfig {
115    fn from(s: &str) -> Self {
116        from_str(s).unwrap()
117    }
118}
orbtk_theming/config/theme_config.rs

orbtk_theming/config/
theme_config.rs
