Desktop: Multiple window support (#11181)

Co-authored-by: Laurent Cozic <laurent22@users.noreply.github.com>

packages/app-desktop/gui/WindowCommandsAndDialogs/commands/openPdfViewer.ts

@@ -0,0 +1,27 @@
+import { CommandRuntime, CommandDeclaration, CommandContext } from '@joplin/lib/services/CommandService';
+import { _ } from '@joplin/lib/locale';
+import Resource from '@joplin/lib/models/Resource';
+
+export const declaration: CommandDeclaration = {
+	name: 'openPdfViewer',
+	label: () => _('Open PDF viewer'),
+};
+
+export const runtime = (): CommandRuntime => {
+	return {
+		execute: async (context: CommandContext, resourceId: string, pageNo: number) => {
+
+			const resource = await Resource.load(resourceId);
+			if (!resource) throw new Error(`No such resource: ${resourceId}`);
+			if (resource.mime !== 'application/pdf') throw new Error(`Not a PDF: ${resource.mime}`);
+			context.dispatch({
+				type: 'DIALOG_OPEN',
+				name: 'pdfViewer',
+				props: {
+					resource,
+					pageNo: pageNo,
+				},
+			});
+		},
+	};
+};