add an example

Author: jwahlstrand

examples/previewer.jl

@@ -0,0 +1,33 @@
+using Gtk4, GtkMarkdownTextView, Markdown
+
+w = GtkWindow("GtkMarkdownTextView example")
+Gtk4.default_size(w, 400, 600)
+p = GtkPaned(:h)
+w[] = p
+
+md = """
+This widget displays Markdown, including **bold**, *italics*, and `code`.
+
+It also:
+- displays
+- bulleted
+- lists
+
+## Further remarks
+
+Blah blah blah
+"""
+
+tv = GtkTextView(; wrap_mode=Gtk4.WrapMode_WORD)
+tv.buffer.text = md
+p[1] = tv
+
+v = MarkdownTextView(md)
+p[2] = v
+
+signal_connect(tv.buffer, "changed") do buffer
+    v.buffer.text = ""
+    GtkMarkdownTextView.insert_MD!(v.buffer, Markdown.parse(buffer.text))
+end
+
+show(w)