WIP: MduiCustomTextArea

client/ui/MduiPatchedTextAreaElement.ts

@@ -0,0 +1,58 @@
+import { $ } from "mdui"
+
+export default class MduiPatchedTextAreaElement extends HTMLElement {
+    static observedAttributes = ['user-id']
+    declare inputDiv: HTMLDivElement
+    constructor() {
+        super()
+
+        this.attachShadow({ mode: 'open' })
+    }
+
+    _lastValue = ''
+    connectedCallback() {
+        const shadow = this.shadowRoot as ShadowRoot
+
+        this.inputDiv = new DOMParser().parseFromString(`
+            <div contentEditable="true" style="outline: none !important; color: rgb(var(--mdui-color-on-surface-variant)); display: inline-block; word-wrap: break-word; white-space: pre-wrap;"></div>
+        `, 'text/html').body.firstChild as HTMLDivElement
+        this.inputDiv.contentEditable = 'true'
+
+        this.inputDiv.addEventListener('blur', () => {
+            if (this._lastValue !== this.value) {
+                this._lastValue = this.value || ''
+                this.dispatchEvent(new Event('change', { bubbles: true }))
+            }
+        })
+        this.inputDiv.addEventListener('paste', (e: ClipboardEvent) => {
+            e.preventDefault()
+            document.execCommand('insertText', false, e.clipboardData?.getData("text/plain") || '')
+        })
+
+        this.inputDiv.style.width = '100%'
+
+        shadow.appendChild(this.inputDiv)
+    }
+    attributeChangedCallback(name: string, oldValue: string | null, newValue: string | null) {
+        switch (name) {
+            case 'value': {
+                this.value = newValue || ''
+                break
+            }
+        }
+    }
+    focus() {
+        this.inputDiv.focus()
+    }
+    blur() {
+        this.inputDiv.blur()
+    }
+    get value() {
+        return this.inputDiv.textContent
+    }
+    set value(v) {
+        this.inputDiv.textContent = v
+    }
+}
+
+customElements.define('mdui-patched-textarea', MduiPatchedTextAreaElement)