PDFViewer: Add zoom in/out/reset menu actions

Make PDFViewer::zoom_in() & ::zoom_out() public and add menu and toolbar
actions. Also add an action for zoom reset.

Userland/Applications/PDFViewer/PDFViewer.cpp

@@ -109,9 +109,8 @@ void PDFViewer::mousewheel_event(GUI::MouseEvent& event)
                 scrollbar.decrease_slider_by(20);
             }
         }
+        update();
     }
-
-    update();
 }
 
 void PDFViewer::timer_event(Core::TimerEvent&)
@@ -125,14 +124,24 @@ void PDFViewer::timer_event(Core::TimerEvent&)
 
 void PDFViewer::zoom_in()
 {
-    if (m_zoom_level < number_of_zoom_levels - 1)
+    if (m_zoom_level < number_of_zoom_levels - 1) {
         m_zoom_level++;
+        update();
+    }
 }
 
 void PDFViewer::zoom_out()
 {
-    if (m_zoom_level > 0)
+    if (m_zoom_level > 0) {
         m_zoom_level--;
+        update();
+    }
+}
+
+void PDFViewer::reset_zoom()
+{
+    m_zoom_level = initial_zoom_level;
+    update();
 }
 
 RefPtr<Gfx::Bitmap> PDFViewer::render_page(const PDF::Page& page)

Userland/Applications/PDFViewer/PDFViewer.h

@@ -49,6 +49,10 @@ public:
 
     Function<void(u32 new_page)> on_page_change;
 
+    void zoom_in();
+    void zoom_out();
+    void reset_zoom();
+
 protected:
     PDFViewer();
 
@@ -60,9 +64,6 @@ private:
     RefPtr<Gfx::Bitmap> get_rendered_page(u32 index);
     RefPtr<Gfx::Bitmap> render_page(const PDF::Page&);
 
-    void zoom_in();
-    void zoom_out();
-
     RefPtr<PDF::Document> m_document;
     u32 m_current_page_index { 0 };
     Vector<HashMap<u32, RefPtr<Gfx::Bitmap>>> m_rendered_page_list;

Userland/Applications/PDFViewer/PDFViewerWidget.cpp

@@ -58,6 +58,10 @@ void PDFViewerWidget::initialize_menubar(GUI::Window& window)
 
     auto& view_menu = window.add_menu("&View");
     view_menu.add_action(*m_toggle_sidebar_action);
+    view_menu.add_separator();
+    view_menu.add_action(*m_zoom_in_action);
+    view_menu.add_action(*m_zoom_out_action);
+    view_menu.add_action(*m_reset_zoom_action);
 
     auto& help_menu = window.add_menu("&Help");
     help_menu.add_action(GUI::CommonActions::make_about_action("PDF Viewer", GUI::Icon::default_icon("app-pdf-viewer"), &window));
@@ -111,6 +115,28 @@ void PDFViewerWidget::create_toolbar()
     };
 
     m_total_page_label = toolbar.add<GUI::Label>();
+    m_total_page_label->set_fixed_width(30);
+    toolbar.add_separator();
+
+    m_zoom_in_action = GUI::CommonActions::make_zoom_in_action([&](auto&) {
+        m_viewer->zoom_in();
+    });
+
+    m_zoom_out_action = GUI::CommonActions::make_zoom_out_action([&](auto&) {
+        m_viewer->zoom_out();
+    });
+
+    m_reset_zoom_action = GUI::CommonActions::make_reset_zoom_action([&](auto&) {
+        m_viewer->reset_zoom();
+    });
+
+    m_zoom_in_action->set_enabled(false);
+    m_zoom_out_action->set_enabled(false);
+    m_reset_zoom_action->set_enabled(false);
+
+    toolbar.add_action(*m_zoom_in_action);
+    toolbar.add_action(*m_zoom_out_action);
+    toolbar.add_action(*m_reset_zoom_action);
 }
 
 void PDFViewerWidget::open_file(int fd, String const& path)
@@ -131,7 +157,6 @@ void PDFViewerWidget::open_file(int fd, String const& path)
 
     m_viewer->set_document(document);
     m_total_page_label->set_text(String::formatted("of {}", document->get_page_count()));
-    m_total_page_label->set_fixed_width(30);
 
     m_page_text_box->set_enabled(true);
     m_page_text_box->set_current_number(1, false);
@@ -139,6 +164,9 @@ void PDFViewerWidget::open_file(int fd, String const& path)
     m_go_to_prev_page_action->set_enabled(false);
     m_go_to_next_page_action->set_enabled(document->get_page_count() > 1);
     m_toggle_sidebar_action->set_enabled(true);
+    m_zoom_in_action->set_enabled(true);
+    m_zoom_out_action->set_enabled(true);
+    m_reset_zoom_action->set_enabled(true);
 
     if (document->outline()) {
         auto outline = document->outline();

Userland/Applications/PDFViewer/PDFViewerWidget.h

@@ -35,6 +35,10 @@ private:
     RefPtr<GUI::Action> m_go_to_prev_page_action;
     RefPtr<GUI::Action> m_go_to_next_page_action;
     RefPtr<GUI::Action> m_toggle_sidebar_action;
+    RefPtr<GUI::Action> m_zoom_in_action;
+    RefPtr<GUI::Action> m_zoom_out_action;
+    RefPtr<GUI::Action> m_reset_zoom_action;
+
     bool m_sidebar_open { false };
     ByteBuffer m_buffer;
 };