color defaults API

src/vs/platform/theme/common/themeService.ts

@@ -14,7 +14,7 @@ export let IThemeService = createDecorator<IThemeService>('themeService');
 export interface ITheme {
 	readonly selector: string;
 	readonly label: string;
-	getColor(colorId: string): Color;
+	getColor(color: string): Color;
 
 	isLightTheme(): boolean;
 	isDarkTheme(): boolean;

src/vs/platform/theme/common/themingRegistry.ts

@@ -6,6 +6,9 @@
 
 import platform = require('vs/platform/platform');
 import { IJSONSchema } from 'vs/base/common/jsonSchema';
+import { Color } from 'vs/base/common/color';
+import { ITheme } from 'vs/platform/theme/common/themeService';
+
 
 import nls = require('vs/nls');
 
@@ -16,20 +19,39 @@ export const Extensions = {
 export interface IColorContribution {
 	readonly id: string;
 	readonly description: string;
+	readonly defaults: ColorDefaults;
+}
+
+export interface DerivedColor {
+	(theme: ITheme): Color;
+}
+
+export interface ColorDefaults {
+	light: ColorDescription;
+	dark: ColorDescription;
+	hc: ColorDescription;
 }
 
+export type ColorDescription = string | IColorContribution | DerivedColor;
+
+
 export interface IThemingRegistry {
 
 	/**
 	 * Register a color to the registry.
 	 */
-	registerColor(id: string, description: string): IColorContribution;
+	registerColor(id: string, description: string, defaults?: ColorDefaults): IColorContribution;
 
 	/**
 	 * Get all color contributions
 	 */
 	getColors(): IColorContribution[];
 
+	/**
+	 * Gets the color of the given id
+	 */
+	getColor(id: string): IColorContribution;
+
 	/**
 	 * JSON schema of all colors
 	 */
@@ -37,6 +59,16 @@ export interface IThemingRegistry {
 
 }
 
+export function darken(colorDesc: ColorDescription, factor: number): DerivedColor {
+	return (theme) => {
+		let color = resolveDescription(theme, colorDesc);
+		if (color) {
+			return color.darken(factor);
+		}
+		return null;
+	};
+}
+
 
 class ThemingRegistry implements IThemingRegistry {
 	private colorsById: { [key: string]: IColorContribution };
@@ -46,8 +78,8 @@ class ThemingRegistry implements IThemingRegistry {
 		this.colorsById = {};
 	}
 
-	public registerColor(id: string, description: string): IColorContribution {
-		let colorContribution: IColorContribution = { id, description };
+	public registerColor(id: string, description: string, defaults: ColorDefaults) {
+		let colorContribution: IColorContribution = { id, description, defaults };
 		this.colorsById[id] = colorContribution;
 		this.colorSchema.properties[id] = { type: 'string', description };
 		return colorContribution;
@@ -57,11 +89,40 @@ class ThemingRegistry implements IThemingRegistry {
 		return Object.keys(this.colorsById).map(id => this.colorsById[id]);
 	}
 
+	public getColor(id: string): IColorContribution {
+		return this.colorsById[id];
+	}
+
 	public getColorSchema(): IJSONSchema {
 		return this.colorSchema;
 	}
 
 }
 
+function resolveDescription(theme: ITheme, colorDesc: ColorDescription): Color {
+	if (typeof colorDesc === 'string') {
+		return Color.fromHex(colorDesc);
+	} else if (typeof colorDesc === 'object' && colorDesc !== null) {
+		let defaults = colorDesc.defaults;
+		if (!defaults) {
+			return null;
+		}
+		if (theme.isDarkTheme()) {
+			return resolveDescription(theme, defaults.dark);
+		} else if (theme.isLightTheme()) {
+			return resolveDescription(theme, defaults.light);
+		} else {
+			return resolveDescription(theme, defaults.hc);
+		}
+	} else if (typeof colorDesc === 'function') {
+		return colorDesc(theme);
+	} else {
+		return null;
+	}
+}
+
+
+
+
 const themingRegistry = new ThemingRegistry();
 platform.Registry.add(Extensions.ThemingContribution, themingRegistry);
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