polish create page

css/create.css

@@ -3,3 +3,11 @@
     word-break: break-all;
     text-align: center;
 }
+
+.CreateLinkView form {
+    margin-top: 36px;
+}
+
+.CreateLinkView form > *:not(:first-child) {
+    margin-top: 24px;
+}

css/main.css

@@ -47,7 +47,6 @@ body {
     height: 100%;
     width: 100%;
     font-size: 14px;
-    line-height: 24px;
     color: var(--font);
     padding: 120px 0 0 0;
     margin: 0;
@@ -142,9 +141,8 @@ button.text:hover {
     text-decoration: none;
     font-weight: bold;
     text-align: center;
-    padding: 8px;
+    padding: 12px 8px;
     margin: 8px 0;
-    line-height: 24px;
 }
 
 .secondary {
@@ -158,6 +156,23 @@ button.text:hover {
     border-radius: 32px;
 }
 
+.primary.icon {
+    background-repeat: no-repeat;
+    background-position: 12px center;
+}
+
+.icon.link {
+    background-image: url('../images/link.svg');
+}
+
+.icon.tick {
+    background-image: url('../images/tick.svg');
+}
+
+.icon.copy {
+    background-image: url('../images/copy.svg');
+}
+
 button.primary, input[type='submit'].primary, button.secondary, input[type='submit'].secondary {
     border: none;
     font-size: inherit;

src/Link.js

@@ -58,6 +58,15 @@ export const LinkKind = createEnum(
 )
 
 export class Link {
+    static validateIdentifier(identifier) {
+        return !!(
+            USERID_PATTERN.exec(identifier) ||
+            ROOMALIAS_PATTERN.exec(identifier) || 
+            ROOMID_PATTERN.exec(identifier) ||
+            GROUPID_PATTERN.exec(identifier)
+        );
+    }
+
 	static parse(fragment) {
 		if (!fragment) {
 			return null;

src/create/CreateLinkView.js

@@ -17,23 +17,53 @@ limitations under the License.
 import {TemplateView} from "../utils/TemplateView.js";
 import {PreviewView} from "../preview/PreviewView.js";
 
+function selectNode(node) {
+    let selection = window.getSelection();
+    selection.removeAllRanges();
+    let range = document.createRange();
+    range.selectNode(copyNode);
+    selection.addRange(range);
+}
+
+function copyButton(t, copyNode, label, classNames) {
+    return t.button({className: `${classNames} icon copy`, onClick: evt => {
+        const button = evt.target;
+        selectNode(copyNode);
+        if (document.execCommand("copy")) {
+            button.innerText = "Copied!";
+            button.classList.remove("copy");
+            button.classList.add("tick");
+            setTimeout(() => {
+                button.classList.remove("tick");
+                button.classList.add("copy");
+                button.innerText = label;
+            }, 2000);
+        }
+    }}, label);
+}
+
 export class CreateLinkView extends TemplateView {
 	render(t, vm) {
+        const link = t.a({href: vm => vm.linkUrl}, vm => vm.linkUrl);
 		return t.div({className: "CreateLinkView card"}, [
 			t.h1(
 				{className: {hidden: vm => vm.previewViewModel}},
 				"Create shareable links to Matrix rooms, users or messages without being tied to any app"
 			),
 			t.mapView(vm => vm.previewViewModel, childVM => childVM ? new PreviewView(childVM) : null),
-			t.h2({className: {hidden: vm => !vm.linkUrl}}, t.a({href: vm => vm.linkUrl}, vm => vm.linkUrl)),
-			t.form({action: "#", onSubmit: evt => this._onSubmit(evt)}, [
+            t.div({className: {hidden: vm => !vm.linkUrl}}, [
+                t.h2(link),
+                t.div(copyButton(t, link, "Copy link", "fullwidth primary")),
+            ]),
+			t.form({action: "#", onSubmit: evt => this._onSubmit(evt), className: {hidden: vm => vm.linkUrl}}, [
 				t.div(t.input({
 					className: "fullwidth large",
 					type: "text",
 					name: "identifier",
-					placeholder: "#room:example.com, @user:example.com"
+					placeholder: "#room:example.com, @user:example.com",
+                    onChange: evt => this._onIdentifierChange(evt)
 				})),
-				t.div(t.input({className: "primary fullwidth", type: "submit", value: "Create link"}))
+				t.div(t.input({className: "primary fullwidth icon link", type: "submit", value: "Create link"}))
 			]),
 		]);
 	}
@@ -44,4 +74,13 @@ export class CreateLinkView extends TemplateView {
 		const identifier = form.elements.identifier.value;
 		this.value.createLink(identifier);
 	}
+
+    _onIdentifierChange(evt) {
+        const inputField = evt.target;
+        if (!this.value.validateIdentifier(inputField.value)) {
+            inputField.setCustomValidity("That doesn't seem valid. Try #room:example.com, @user:example.com or +group:example.com.");
+        } else {
+            inputField.setCustomValidity("");
+        }
+    }
 }

src/create/CreateLinkViewModel.js

@@ -24,6 +24,10 @@ export class CreateLinkViewModel extends ViewModel {
 		this.previewViewModel = null;
 	}
 
+    validateIdentifier(identifier) {
+        return Link.validateIdentifier(identifier);
+    }
+
     async createLink(identifier) {
         this._link = Link.parse(identifier);
         if (this._link) {