PDFViewer: Add a tab bar with outlines and thumbnails

Outlines are in theory implemented (though I'm having trouble finding
a simple PDF with outlines to test it on), and thumbnails are not.

1 files changed, 35 insertions, 0 deletions

diff --git a/Userland/Applications/PDFViewer/SidebarWidget.h b/Userland/Applications/PDFViewer/SidebarWidget.h
new file mode 100644
index 0000000000..5d0657c726
--- /dev/null
+++ b/Userland/Applications/PDFViewer/SidebarWidget.h
@@ -0,0 +1,35 @@
+/*
+ * Copyright (c) 2021, Matthew Olsson <mattco@serenityos.org>
+ *
+ * SPDX-License-Identifier: BSD-2-Clause
+ */
+
+#pragma once
+
+#include "OutlineModel.h"
+#include <LibGUI/TreeView.h>
+#include <LibGUI/Widget.h>
+
+class SidebarWidget final : public GUI::Widget {
+    C_OBJECT(SidebarWidget)
+
+public:
+    ~SidebarWidget() override = default;
+
+    void set_outline(RefPtr<PDF::OutlineDict> outline)
+    {
+        if (outline) {
+            m_model = OutlineModel::create(outline.release_nonnull());
+            m_outline_tree_view->set_model(m_model);
+        } else {
+            m_model = RefPtr<OutlineModel> {};
+            m_outline_tree_view->set_model({});
+        }
+    }
+
+private:
+    SidebarWidget();
+
+    RefPtr<OutlineModel> m_model;
+    RefPtr<GUI::TreeView> m_outline_tree_view;
+};