From abb85f701d340528473be589412344ac6db5e1f4 Mon Sep 17 00:00:00 2001
From: Eryn Wells <eryn@erynwells.me>
Date: Thu, 12 Oct 2023 11:05:02 -0700
Subject: [PATCH] Ruby Switch script v1

---
 assets/scripts/ruby_switch.js | 164 ++++++++++++++++++++++++++++++++++
 1 file changed, 164 insertions(+)
 create mode 100644 assets/scripts/ruby_switch.js

diff --git a/assets/scripts/ruby_switch.js b/assets/scripts/ruby_switch.js
new file mode 100644
index 0000000..af48857
--- /dev/null
+++ b/assets/scripts/ruby_switch.js
@@ -0,0 +1,164 @@
+class RubySwitch extends HTMLElement {
+    static controlSizeInPixels = 32;
+    static thumbTransitionDuration = 0.1;
+
+    static settings = [
+        {
+            id: "ruby-switch-none",
+            value: "none",
+            label: "あ"
+        },
+        {
+            id: "ruby-switch-both",
+            value: "both",
+            label: "あa",
+            default: true
+        },
+        {
+            id: "ruby-switch-hidden",
+            value: "hidden",
+            label: "ab"
+        },
+    ];
+
+    #root;
+    #thumb;
+
+    constructor() {
+        super();
+
+        this.#updateValue(RubySwitch.settings.find(obj => obj.default).value);
+        this.addEventListener("RubyStyleChanged", event => {
+            this.#updateValue(event.detail.style);
+        });
+
+        this.#root = this.attachShadow({ mode: "closed" });
+        this.#buildShadowDOM();
+
+        this.#updateThumbPosition(this.#root.querySelector(".control[data-default]"));
+    }
+
+    #updateValue(style) {
+        this.setAttribute("value", style);
+    }
+
+    get #stylesheet() {
+        const controlSize = RubySwitch.controlSizeInPixels;
+        const halfControlSize = controlSize / 2;
+
+        return `
+            #ruby-controls {
+                box-sizing: border-box;
+                display: inline-block;
+                position: relative;
+            }
+
+            #controls {
+                border: none;
+                box-sizing: border-box;
+                display: inline grid;
+                grid-template-columns: repeat(3, ${controlSize}px);
+                margin: 0;
+                overflow: none;
+                padding: 0;
+            }
+
+            #thumb {
+                box-sizing: border-box;
+                box-shadow: 2px 2px 6px #ccc;
+                border: 0.5px solid #aaa;
+                border-radius: ${halfControlSize}px;
+                position: absolute;
+                top: 0;
+                height: ${controlSize}px;
+                width: ${controlSize}px;
+                z-index: 50;
+                transition: left ${RubySwitch.thumbTransitionDuration}s;
+            }
+
+            .control {
+                aspect-ratio: 1;
+                display: flex;
+                justify-content: center;
+                align-items: center;
+                height: ${controlSize}px;
+                width: ${controlSize}px;
+            }
+
+            b {
+                font-weight: normal;
+                cursor: pointer;
+            }
+
+            label {
+                z-index: 2;
+                text-align: center;
+            }
+        `;
+    }
+
+    #buildShadowDOM() {
+        const root = this.#root;
+
+        const style = document.createElement("style");
+        style.textContent = this.#stylesheet;
+        root.appendChild(style);
+
+        let container = document.createElement("div");
+        container.id = "ruby-controls";
+        root.appendChild(container);
+
+        let controls = document.createElement("div");
+        controls.id = "controls";
+        container.appendChild(controls);
+
+        for (const desc of RubySwitch.settings) {
+            let control = document.createElement("div");
+            control.classList.add("control")
+            control.id = desc.id;
+
+            control.dataset.value = desc.value;
+            if (desc.default) {
+                control.dataset.default = "";
+            }
+
+            controls.appendChild(control);
+
+            control.addEventListener("click", event => {
+                event.stopPropagation();
+                event.preventDefault();
+
+                this.#updateThumbPosition(event.currentTarget);
+
+                this.#root.dispatchEvent(new CustomEvent("RubyStyleChanged", {
+                    bubbles: true,
+                    composed: true,
+                    detail: {
+                        style: control.dataset.value,
+                    },
+                }));
+            }, { capture: true });
+
+            const label = document.createElement("b");
+            label.textContent = desc.label;
+            control.appendChild(label);
+        }
+
+        const thumb = document.createElement("div");
+        this.#thumb = thumb;
+        thumb.id = "thumb";
+        container.appendChild(thumb);
+    }
+
+    #updateThumbPosition(selectedControl) {
+        const controls = this.#root.querySelector("#controls");
+
+        const trackBoundingRect = controls.getBoundingClientRect();
+        const controlBoundingRect = selectedControl.getBoundingClientRect();
+
+        const offset = controlBoundingRect.left - trackBoundingRect.left;
+        this.#thumb.style.left = `${offset}px`;
+    }
+}
+
+customElements.define("ruby-switch", RubySwitch);