FontEditor: Allow application to launch without a font

Since LibFSAC requires a reified window before loading a font, it
makes sense to have a safe null state for the app.

This lets us stay alive after a failed file request on startup,
handle failure at any point during initialization, and claw back
memory from all our font RefPtrs.

A default startup font or none at all can now be set in FontEditor.ini

Base/home/anon/.config/FontEditor.ini

@@ -0,0 +1,2 @@
+[Defaults]
+Font=/res/fonts/KaticaRegular10.font

Userland/Applications/FontEditor/FontEditorWindow.gml

@@ -23,10 +23,13 @@
 
             @FontEditor::GlyphEditorWidget {
                 name: "glyph_editor_widget"
+                visible: false
             }
 
             @GUI::Widget {
+                name: "width_control_container"
                 preferred_height: "shrink"
+                visible: false
                 layout: @GUI::VerticalBoxLayout {}
 
                 @GUI::SpinBox {

Userland/Applications/FontEditor/MainWidget.cpp

@@ -9,6 +9,7 @@
 #include "GlyphEditorWidget.h"
 #include "NewFontDialog.h"
 #include <AK/Array.h>
+#include <AK/ScopeGuard.h>
 #include <AK/String.h>
 #include <AK/StringBuilder.h>
 #include <AK/StringUtils.h>
@@ -230,9 +231,9 @@ ErrorOr<void> MainWidget::create_actions()
     m_show_unicode_blocks_action = GUI::Action::create_checkable("&Unicode Blocks", { Mod_Ctrl, Key_U }, [this](auto& action) {
         m_unicode_block_container->set_visible(action.is_checked());
         if (action.is_checked())
-            m_search_textbox->set_focus(true);
+            m_search_textbox->set_focus(m_initialized);
         else
-            m_glyph_map_widget->set_focus(true);
+            m_glyph_map_widget->set_focus(m_initialized);
         Config::write_bool("FontEditor"sv, "Layout"sv, "ShowUnicodeBlocks"sv, action.is_checked());
     });
     m_show_unicode_blocks_action->set_checked(show_unicode_blocks);
@@ -463,6 +464,7 @@ ErrorOr<void> MainWidget::create_widgets()
     m_font_metadata_groupbox = find_descendant_of_type_named<GUI::GroupBox>("font_metadata_groupbox");
     m_unicode_block_container = find_descendant_of_type_named<GUI::Widget>("unicode_block_container");
     m_toolbar_container = find_descendant_of_type_named<GUI::ToolbarContainer>("toolbar_container");
+    m_width_control_container = find_descendant_of_type_named<GUI::Widget>("width_control_container");
 
     m_glyph_map_widget = find_descendant_of_type_named<GUI::GlyphMapWidget>("glyph_map_widget");
     m_glyph_editor_widget = find_descendant_of_type_named<GlyphEditorWidget>("glyph_editor_widget");
@@ -637,19 +639,24 @@ ErrorOr<void> MainWidget::initialize(StringView path, RefPtr<Gfx::BitmapFont>&&
     if (m_font == mutable_font)
         return {};
 
-    TRY(m_glyph_map_widget->initialize(mutable_font));
+    ScopeGuard reset_on_error([&] {
+        if (!m_initialized)
+            reset();
+    });
 
+    m_initialized = false;
+    m_path = TRY(String::from_utf8(path));
+    m_font = move(mutable_font);
+
+    TRY(m_glyph_map_widget->initialize(m_font));
     auto active_glyph = m_glyph_map_widget->active_glyph();
     m_glyph_map_widget->set_focus(true);
     m_glyph_map_widget->scroll_to_glyph(active_glyph);
 
     auto selection = m_glyph_map_widget->selection().normalized();
-    m_undo_selection = TRY(try_make_ref_counted<UndoSelection>(selection.start(), selection.size(), active_glyph, *mutable_font, *m_glyph_map_widget));
+    m_undo_selection = TRY(try_make_ref_counted<UndoSelection>(selection.start(), selection.size(), active_glyph, *m_font, *m_glyph_map_widget));
     m_undo_stack->clear();
 
-    m_path = TRY(String::from_utf8(path));
-    m_font = mutable_font;
-
     if (m_preview_label)
         m_preview_label->set_font(*m_font);
 
@@ -692,6 +699,9 @@ ErrorOr<void> MainWidget::initialize(StringView path, RefPtr<Gfx::BitmapFont>&&
     window()->set_modified(false);
     update_title();
     update_statusbar();
+    set_actions_enabled(true);
+    set_widgets_enabled(true);
+    m_initialized = true;
 
     return {};
 }
@@ -881,6 +891,9 @@ void MainWidget::did_modify_font()
 
 void MainWidget::update_statusbar()
 {
+    if (!m_font)
+        return;
+
     if (!m_statusbar->is_visible())
         return;
 
@@ -1073,4 +1086,88 @@ void MainWidget::show_error(Error error, StringView action, StringView basename)
         (void)GUI::MessageBox::try_show_error(window(), maybe_message.release_value());
 }
 
+void MainWidget::reset()
+{
+    VERIFY(window());
+
+    m_initialized = false;
+    m_font = nullptr;
+    m_path = {};
+    m_undo_selection = nullptr;
+    m_undo_stack->clear();
+
+    (void)m_glyph_map_widget->initialize(nullptr);
+    m_glyph_editor_widget->initialize(nullptr);
+
+    if (m_font_preview_window)
+        m_font_preview_window->close();
+    if (m_preview_label)
+        m_preview_label->set_font(nullptr);
+
+    m_name_textbox->set_text({}, GUI::AllowCallback::No);
+    m_family_textbox->set_text({}, GUI::AllowCallback::No);
+    m_slope_combobox->set_text({}, GUI::AllowCallback::No);
+    m_weight_combobox->set_text({}, GUI::AllowCallback::No);
+    m_presentation_spinbox->set_text({}, GUI::AllowCallback::No);
+    m_baseline_spinbox->set_text({}, GUI::AllowCallback::No);
+    m_mean_line_spinbox->set_text({}, GUI::AllowCallback::No);
+    m_spacing_spinbox->set_text({}, GUI::AllowCallback::No);
+    m_fixed_width_checkbox->set_checked(false, GUI::AllowCallback::No);
+    m_statusbar->set_text(0, {});
+    m_statusbar->set_text(1, {});
+
+    window()->set_modified(false);
+    window()->set_title("Font Editor");
+    set_actions_enabled(false);
+    set_widgets_enabled(false);
+    set_focus(true);
+}
+
+void MainWidget::set_actions_enabled(bool enabled)
+{
+    m_save_action->set_enabled(enabled);
+    m_save_as_action->set_enabled(enabled);
+
+    m_cut_action->set_enabled(enabled);
+    m_copy_action->set_enabled(enabled);
+    m_paste_action->set_enabled(enabled && GUI::Clipboard::the().fetch_mime_type() == "glyph/x-fonteditor");
+    m_delete_action->set_enabled(enabled);
+
+    m_copy_text_action->set_enabled(enabled);
+    m_select_all_action->set_enabled(enabled);
+
+    m_go_to_glyph_action->set_enabled(enabled);
+    m_previous_glyph_action->set_enabled(enabled);
+    m_next_glyph_action->set_enabled(enabled);
+
+    m_move_glyph_action->set_enabled(enabled);
+    m_paint_glyph_action->set_enabled(enabled);
+
+    m_flip_horizontal_action->set_enabled(enabled);
+    m_flip_vertical_action->set_enabled(enabled);
+    m_rotate_clockwise_action->set_enabled(enabled);
+    m_rotate_counterclockwise_action->set_enabled(enabled);
+
+    m_open_preview_action->set_enabled(enabled);
+    m_highlight_modifications_action->set_enabled(enabled);
+    m_show_system_emoji_action->set_enabled(enabled);
+
+    m_scale_five_action->set_enabled(enabled);
+    m_scale_ten_action->set_enabled(enabled);
+    m_scale_fifteen_action->set_enabled(enabled);
+}
+
+void MainWidget::set_widgets_enabled(bool enabled)
+{
+    m_font_metadata_groupbox->set_enabled(enabled);
+    m_unicode_block_container->set_enabled(enabled);
+    m_width_control_container->set_enabled(enabled);
+    m_width_control_container->set_visible(enabled);
+
+    m_glyph_map_widget->set_enabled(enabled);
+    m_glyph_editor_widget->set_enabled(enabled);
+    m_glyph_editor_widget->set_visible(enabled);
+    m_statusbar->segment(1).set_visible(enabled);
+}
+
 }

Userland/Applications/FontEditor/MainWidget.h

@@ -29,6 +29,9 @@ public:
 
     virtual ~MainWidget() override = default;
 
+    void show_error(Error, StringView action, StringView basename = {});
+    void reset();
+
     ErrorOr<void> initialize(StringView path, RefPtr<Gfx::BitmapFont>&&);
     ErrorOr<void> initialize_menubar(GUI::Window&);
 
@@ -61,6 +64,8 @@ private:
     void update_title();
 
     void set_scale_and_save(i32);
+    void set_actions_enabled(bool);
+    void set_widgets_enabled(bool);
 
     ErrorOr<void> copy_selected_glyphs();
     ErrorOr<void> cut_selected_glyphs();
@@ -70,8 +75,6 @@ private:
     void push_undo();
     void reset_selection_and_push_undo();
 
-    void show_error(Error, StringView action, StringView basename = {});
-
     RefPtr<GUI::GlyphMapWidget> m_glyph_map_widget;
     RefPtr<GlyphEditorWidget> m_glyph_editor_widget;
 
@@ -122,6 +125,7 @@ private:
     RefPtr<GUI::Statusbar> m_statusbar;
     RefPtr<GUI::ToolbarContainer> m_toolbar_container;
     RefPtr<GUI::Widget> m_unicode_block_container;
+    RefPtr<GUI::Widget> m_width_control_container;
     RefPtr<GUI::ComboBox> m_weight_combobox;
     RefPtr<GUI::ComboBox> m_slope_combobox;
     RefPtr<GUI::SpinBox> m_spacing_spinbox;
@@ -150,6 +154,7 @@ private:
     Vector<String> m_font_slope_list;
     Vector<String> m_unicode_block_list;
     Unicode::CodePointRange m_range { 0x0000, 0x10FFFF };
+    bool m_initialized { false };
 };
 
 }

Userland/Applications/FontEditor/main.cpp

@@ -14,7 +14,6 @@
 #include <LibGUI/Application.h>
 #include <LibGUI/Icon.h>
 #include <LibGUI/Window.h>
-#include <LibGfx/Font/BitmapFont.h>
 #include <LibMain/Main.h>
 
 ErrorOr<int> serenity_main(Main::Arguments arguments)
@@ -47,6 +46,7 @@ ErrorOr<int> serenity_main(Main::Arguments arguments)
 
     auto font_editor = TRY(window->set_main_widget<FontEditor::MainWidget>());
     TRY(font_editor->initialize_menubar(*window));
+    font_editor->reset();
 
     window->on_close_request = [&]() -> GUI::Window::CloseRequestDecision {
         if (font_editor->request_close())
@@ -56,16 +56,16 @@ ErrorOr<int> serenity_main(Main::Arguments arguments)
 
     window->show();
 
-    auto path_to_load = path.is_empty() ? "/res/fonts/KaticaRegular10.font"sv : path;
-    auto file = TRY(FileSystemAccessClient::Client::the().request_file_read_only_approved(window, path_to_load));
-
-    if (!path.is_empty()) {
-        TRY(font_editor->open_file(file.filename(), file.release_stream()));
-    } else {
-        auto mapped_file = TRY(Core::MappedFile::map_from_file(file.release_stream(), path_to_load));
-        auto mutable_font = TRY(TRY(Gfx::BitmapFont::try_load_from_mapped_file(mapped_file))->unmasked_character_set());
-        TRY(font_editor->initialize({}, move(mutable_font)));
-    }
+    auto default_path = TRY(String::from_deprecated_string(Config::read_string("FontEditor"sv, "Defaults"sv, "Font"sv, {})));
+    auto path_to_load = path.is_empty() ? default_path : path;
+    auto open_or_error = [&]() -> ErrorOr<void> {
+        if (path_to_load.is_empty())
+            return {};
+        auto file = TRY(FileSystemAccessClient::Client::the().request_file_read_only_approved(window, path_to_load));
+        return TRY(font_editor->open_file(path, file.release_stream()));
+    }();
+    if (open_or_error.is_error())
+        font_editor->show_error(open_or_error.release_error(), "Opening"sv, path_to_load);
 
     return app->exec();
 }