Capture screen like similar to Claude (#1604)

* feat: capture screen

* feat: make it work with latest tool UI

* fix: add screenshot icon

* Update src/lib/components/icons/iconScreenshot.svelte

Co-authored-by: Victor Muštar <victor.mustar@gmail.com>

* fix: capitalization

* fix: stop tracks in finally block

* fix: revert chatwindow changes that shouldnt be there

* fix: tooltip classes

---------

Co-authored-by: Nathan Sarrazin <sarrazin.nathan@gmail.com>
Co-authored-by: Victor Muštar <victor.mustar@gmail.com>

src/lib/components/chat/ChatInput.svelte

@@ -21,6 +21,8 @@
 	import { goto } from "$app/navigation";
 	import { base } from "$app/paths";
 	import IconAdd from "~icons/carbon/add";
+	import { captureScreen } from "$lib/utils/screenshot";
+	import IconScreenshot from "../icons/IconScreenshot.svelte";
 
 	export let files: File[] = [];
 	export let mimeTypes: string[] = [];
@@ -250,6 +252,31 @@
 						</label>
 					</HoverTooltip>
 				</form>
+				{#if mimeTypes.includes("image/*")}
+					<HoverTooltip
+						label="Capture screenshot"
+						position="top"
+						TooltipClassNames="text-xs !text-left !w-auto whitespace-nowrap !py-1 !mb-0 max-sm:hidden"
+					>
+						<button
+							class="base-tool"
+							on:click|preventDefault={async () => {
+								const screenshot = await captureScreen();
+
+								// Convert base64 to blob
+								const base64Response = await fetch(screenshot);
+								const blob = await base64Response.blob();
+
+								// Create a File object from the blob
+								const file = new File([blob], "screenshot.png", { type: "image/png" });
+
+								files = [...files, file];
+							}}
+						>
+							<IconScreenshot classNames="text-xl" />
+						</button>
+					</HoverTooltip>
+				{/if}
 			{/if}
 			{#if modelHasTools}
 				{#each extraTools as tool}

src/lib/components/icons/IconScreenshot.svelte

@@ -0,0 +1,20 @@
+<script lang="ts">
+	export let classNames = "";
+</script>
+
+<svg
+	class={classNames}
+	xmlns="http://www.w3.org/2000/svg"
+	aria-hidden="true"
+	focusable="false"
+	role="img"
+	width="1em"
+	height="1em"
+	fill="currentColor"
+	viewBox="0 0 32 32"
+	><path
+		fill-rule="evenodd"
+		clip-rule="evenodd"
+		d="M5.98 6.01h20.04v16.1H5.98V6.02Zm-2.1 0c0-1.16.94-2.1 2.1-2.1h20.04c1.16 0 2.1.94 2.1 2.1v16.1a2.1 2.1 0 0 1-2.1 2.11H5.98a2.1 2.1 0 0 1-2.1-2.1V6.02Zm5.7 1.65a2.1 2.1 0 0 0-2.1 2.1v2.61a1.05 1.05 0 0 0 2.1 0v-2.6h2.96a1.05 1.05 0 1 0 0-2.11H9.58ZM24.41 18.4a2.1 2.1 0 0 1-2.1 2.1h-2.95a1.05 1.05 0 1 1 0-2.1h2.95v-2.61a1.05 1.05 0 0 1 2.1 0v2.6ZM10.1 25.9a1.05 1.05 0 1 0 0 2.1H22.3a1.05 1.05 0 1 0 0-2.1H10.1Z"
+	/>
+</svg>

src/lib/utils/screenshot.ts

@@ -0,0 +1,43 @@
+export async function captureScreen(): Promise<string> {
+	let stream: MediaStream | undefined;
+	try {
+		// This will show the native browser dialog for screen capture
+		stream = await navigator.mediaDevices.getDisplayMedia({
+			video: true,
+			audio: false,
+		});
+
+		// Create a canvas element to capture the screenshot
+		const canvas = document.createElement("canvas");
+		const video = document.createElement("video");
+
+		// Wait for the video to load metadata
+		await new Promise((resolve) => {
+			video.onloadedmetadata = () => {
+				canvas.width = video.videoWidth;
+				canvas.height = video.videoHeight;
+				video.play();
+				resolve(null);
+			};
+			if (stream) {
+				video.srcObject = stream;
+			} else {
+				throw Error("No stream available");
+			}
+		});
+
+		// Draw the video frame to canvas
+		const context = canvas.getContext("2d");
+		context?.drawImage(video, 0, 0, canvas.width, canvas.height);
+		// Convert to base64
+		return canvas.toDataURL("image/png");
+	} catch (error) {
+		console.error("Error capturing screenshot:", error);
+		throw error;
+	} finally {
+		// Stop all tracks
+		if (stream) {
+			stream.getTracks().forEach((track) => track.stop());
+		}
+	}
+}