drawDB/src/context/SettingsContext.jsx

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import { createContext, useEffect, useState } from "react";
import { tableWidth } from "../data/constants";
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const defaultSettings = {
fix: rewrite coordinate management After some initial smaller fixes, it turned out that I had broken the red line used when linking fields. Fixing this was not trivial as I found myself battling a lot of small bugs relating to scale and translation in the existing code. This was made extra difficult as a lot of coordinates were calculated when necessary in Canvas.jsx. This commit attempts to simplify the coordinate management in a few different ways: * There are now two distinct coordinate systems in use, typically referred to as "spaces". Screen space and diagram space. * Diagram space is no longer measured in pixels (though the dimension-less measure used instead still maps to pixels at 100% zoom). * The canvas now exposes helper methods for transforming between spaces. * Zoom and translation is now managed via the svg viewBox property. * This makes moving items in diagram space much easier as the coordinates remain constant regardless of zoom level. * The canvas now wraps the current mouse position in a context object, making mouse movement much easier to work with. * The transform.pan property now refers to the center of the screen. A new feature in this commit is that scroll wheel zoom is now based on the current cursor location, making the diagram more convenient to move around in. I have tried to focus on Canvas.jsx and avoid changes that might be desctructive on existing save files. I also believe more refactors and abstractions could be introduced based on these changes to make the diagram even easier to work with. However, I deem that out of scope for now.
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strictMode: false,
showFieldSummary: true,
showGrid: true,
mode: "light",
autosave: true,
panning: true,
showCardinality: true,
tableWidth: tableWidth,
showDebugCoordinates: false,
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};
export const SettingsContext = createContext(defaultSettings);
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export default function SettingsContextProvider({ children }) {
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const [settings, setSettings] = useState(defaultSettings);
useEffect(() => {
const settings = localStorage.getItem("settings");
if (settings) {
setSettings(JSON.parse(settings));
}
}, []);
useEffect(() => {
localStorage.setItem("settings", JSON.stringify(settings));
}, [settings]);
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return (
<SettingsContext.Provider value={{ settings, setSettings }}>
{children}
</SettingsContext.Provider>
);
}