Initial version

README.md

@@ -1 +1 @@
-# tp-element
+# tp-media-query

package.json

@@ -1,14 +1,14 @@
 {
-  "name": "@tp/tp-element",
+  "name": "@tp/tp-media-query",
   "version": "0.0.1",
   "description": "",
-  "main": "tp-element.js",
+  "main": "tp-media-query.js",
   "scripts": {
     "test": "echo \"Error: no test specified\" && exit 1"
   },
   "repository": {
     "type": "git",
-    "url": "https://gitea.codeblob.work/tp-elements/tp-element.git"
+    "url": "https://gitea.codeblob.work/tp-elements/tp-media-query.git"
   },
   "author": "trading_peter",
   "license": "Apache-2.0",

tp-element.js

@@ -1,35 +0,0 @@
-/**
-@license
-Copyright (c) 2022 trading_peter
-This program is available under Apache License Version 2.0
-*/
-
-import { LitElement, html, css } from 'lit';
-
-class TpElement extends LitElement {
-  static get styles() {
-    return [
-      css`
-        :host {
-          display: block;
-        }
-      `
-    ];
-  }
-
-  render() {
-    const { } = this;
-
-    return html`
-
-    `;
-  }
-
-  static get properties() {
-    return { };
-  }
-
-
-}
-
-window.customElements.define('tp-element', TpElement);

tp-media-query.js

@@ -0,0 +1,68 @@
+/**
+@license
+Copyright (c) 2022 trading_peter
+This program is available under Apache License Version 2.0
+*/
+
+import { LitElement, css } from 'lit';
+
+class TpMediaQuery extends LitElement {
+  static get styles() {
+    return [
+      css`
+        :host {
+          display: none;
+        }
+      `
+    ];
+  }
+
+  static get properties() {
+    return {
+      query: { type: String },
+    };
+  }
+
+  constructor() {
+    super();
+    this._boundQueryHandler = this.queryHandler.bind(this);
+  }
+
+  connectedCallback() {
+    super.connectedCallback();
+    this.checkQuery();
+  }
+
+  checkQuery() {
+    this._remove();
+    var query = this.query;
+    if (!query) {
+      return;
+    }
+    if (query[0] !== '(') {
+      query = '(' + query + ')';
+    }
+    this._queryMatch = window.matchMedia(query);
+    this._add();
+    this.queryHandler(this._queryMatch);
+  }
+
+  _add() {
+    if (this._queryMatch) {
+      this._queryMatch.addEventListener('change', this._boundQueryHandler);
+    }
+  }
+
+  _remove() {
+    if (this._queryMatch) {
+      this._queryMatch.removeEventListener('change', this._boundQueryHandler);
+    }
+    this._queryMatch = null;
+  }
+
+  queryHandler(mq) {
+    this.dispatchEvent(new CustomEvent('media-query-update', { detail: mq.matches, bubbles: true, composed: true }));
+  }
+}
+
+window.customElements.define('tp-media-query', TpMediaQuery);