Merge branch 'main' into reverb

packages/codemirror/index.mjs

@@ -1,3 +1,4 @@
 export * from './codemirror.mjs';
 export * from './highlight.mjs';
 export * from './flash.mjs';
+export * from './slider.mjs';

packages/codemirror/slider.mjs

@@ -0,0 +1,132 @@
+import { ref, pure } from '@strudel.cycles/core';
+import { WidgetType, ViewPlugin, Decoration } from '@codemirror/view';
+import { StateEffect, StateField } from '@codemirror/state';
+
+export let sliderValues = {};
+const getSliderID = (from) => `slider_${from}`;
+
+export class SliderWidget extends WidgetType {
+  constructor(value, min, max, from, to, view) {
+    super();
+    this.value = value;
+    this.min = min;
+    this.max = max;
+    this.from = from;
+    this.originalFrom = from;
+    this.to = to;
+    this.view = view;
+  }
+
+  eq() {
+    return false;
+  }
+
+  toDOM() {
+    let wrap = document.createElement('span');
+    wrap.setAttribute('aria-hidden', 'true');
+    wrap.className = 'cm-slider'; // inline-flex items-center
+    let slider = wrap.appendChild(document.createElement('input'));
+    slider.type = 'range';
+    slider.min = this.min;
+    slider.max = this.max;
+    slider.step = (this.max - this.min) / 1000;
+    slider.originalValue = this.value;
+    // to make sure the code stays in sync, let's save the original value
+    // becuase .value automatically clamps values so it'll desync with the code
+    slider.value = slider.originalValue;
+    slider.from = this.from;
+    slider.originalFrom = this.originalFrom;
+    slider.to = this.to;
+    slider.style = 'width:64px;margin-right:4px;transform:translateY(4px)';
+    this.slider = slider;
+    slider.addEventListener('input', (e) => {
+      const next = e.target.value;
+      let insert = next;
+      //let insert = next.toFixed(2);
+      const to = slider.from + slider.originalValue.length;
+      let change = { from: slider.from, to, insert };
+      slider.originalValue = insert;
+      slider.value = insert;
+      this.view.dispatch({ changes: change });
+      const id = getSliderID(slider.originalFrom); // matches id generated in transpiler
+      window.postMessage({ type: 'cm-slider', value: Number(next), id });
+    });
+    return wrap;
+  }
+
+  ignoreEvent(e) {
+    return true;
+  }
+}
+
+export const setWidgets = StateEffect.define();
+
+export const updateWidgets = (view, widgets) => {
+  view.dispatch({ effects: setWidgets.of(widgets) });
+};
+
+function getWidgets(widgetConfigs, view) {
+  return widgetConfigs.map(({ from, to, value, min, max }) => {
+    return Decoration.widget({
+      widget: new SliderWidget(value, min, max, from, to, view),
+      side: 0,
+    }).range(from /* , to */);
+  });
+}
+
+export const sliderPlugin = ViewPlugin.fromClass(
+  class {
+    decorations; //: DecorationSet
+
+    constructor(view /* : EditorView */) {
+      this.decorations = Decoration.set([]);
+    }
+
+    update(update /* : ViewUpdate */) {
+      update.transactions.forEach((tr) => {
+        if (tr.docChanged) {
+          this.decorations = this.decorations.map(tr.changes);
+          const iterator = this.decorations.iter();
+          while (iterator.value) {
+            // when the widgets are moved, we need to tell the dom node the current position
+            // this is important because the updateSliderValue function has to work with the dom node
+            iterator.value.widget.slider.from = iterator.from;
+            iterator.value.widget.slider.to = iterator.to;
+            iterator.next();
+          }
+        }
+        for (let e of tr.effects) {
+          if (e.is(setWidgets)) {
+            this.decorations = Decoration.set(getWidgets(e.value, update.view));
+          }
+        }
+      });
+    }
+  },
+  {
+    decorations: (v) => v.decorations,
+  },
+);
+
+export let slider = (value) => {
+  console.warn('slider will only work when the transpiler is used... passing value as is');
+  return pure(value);
+};
+// function transpiled from slider = (value, min, max)
+export let sliderWithID = (id, value, min, max) => {
+  sliderValues[id] = value; // sync state at eval time (code -> state)
+  return ref(() => sliderValues[id]); // use state at query time
+};
+// update state when sliders are moved
+if (typeof window !== 'undefined') {
+  window.addEventListener('message', (e) => {
+    if (e.data.type === 'cm-slider') {
+      if (sliderValues[e.data.id] !== undefined) {
+        // update state when slider is moved
+        sliderValues[e.data.id] = e.data.value;
+      } else {
+        console.warn(`slider with id "${e.data.id}" is not registered. Only ${Object.keys(sliderValues)}`);
+      }
+    }
+  });
+}