HackStudio: Add GML Preview action tab

This allows us to show a GML Preview in realtime via
HackStudio::GMLPreviewWidget! :^)

Userland/DevTools/HackStudio/CMakeLists.txt

@@ -34,6 +34,7 @@ set(SOURCES
     Git/GitFilesView.cpp
     Git/GitRepo.cpp
     Git/GitWidget.cpp
+    GMLPreviewWidget.cpp
     HackStudioWidget.cpp
     Language.cpp
     LanguageClient.cpp

Userland/DevTools/HackStudio/GMLPreviewWidget.cpp

@@ -0,0 +1,40 @@
+/*
+ * Copyright (c) 2021, Conor Byrne <cbyrneee@protonmail.com>
+ *
+ * SPDX-License-Identifier: BSD-2-Clause
+ */
+
+#include "GMLPreviewWidget.h"
+#include <LibGUI/BoxLayout.h>
+#include <LibGUI/Label.h>
+
+namespace HackStudio {
+
+GMLPreviewWidget::GMLPreviewWidget(String const& gml_content)
+{
+    set_layout<GUI::VerticalBoxLayout>();
+    load_gml(gml_content);
+}
+
+void GMLPreviewWidget::load_gml(String const& gml)
+{
+    remove_all_children();
+
+    if (gml.is_empty()) {
+        auto& label = add<GUI::Label>();
+        label.set_text("Open a .gml file to show the preview");
+
+        return;
+    }
+
+    load_from_gml(gml, [](const String& name) -> RefPtr<Core::Object> {
+        return GUI::Label::construct(String::formatted("{} is not registered as a GML element!", name));
+    });
+
+    if (children().is_empty()) {
+        auto& label = add<GUI::Label>();
+        label.set_text("Failed to load GML!");
+    }
+}
+
+}

Userland/DevTools/HackStudio/GMLPreviewWidget.h

@@ -0,0 +1,23 @@
+/*
+ * Copyright (c) 2021, Conor Byrne <cbyrneee@protonmail.com>
+ *
+ * SPDX-License-Identifier: BSD-2-Clause
+ */
+
+#pragma once
+
+#include <AK/LexicalPath.h>
+#include <LibGUI/Widget.h>
+
+namespace HackStudio {
+
+class GMLPreviewWidget final : public GUI::Widget {
+    C_OBJECT(GMLPreviewWidget)
+public:
+    void load_gml(String const&);
+
+private:
+    explicit GMLPreviewWidget(String const&);
+};
+
+}

Userland/DevTools/HackStudio/HackStudioWidget.cpp

@@ -288,6 +288,9 @@ bool HackStudioWidget::open_file(const String& full_filename)
     current_editor().set_focus(true);
 
     current_editor().on_cursor_change = [this] { update_statusbar(); };
+    current_editor().on_change = [this] { update_gml_preview(); };
+    update_gml_preview();
+
     return true;
 }
 
@@ -504,6 +507,7 @@ void HackStudioWidget::add_new_editor(GUI::Widget& parent)
     wrapper->editor().set_focus(true);
     wrapper->set_project_root(LexicalPath(m_project->root_path()));
     wrapper->editor().on_cursor_change = [this] { update_statusbar(); };
+    wrapper->editor().on_change = [this] { update_gml_preview(); };
 }
 
 NonnullRefPtr<GUI::Action> HackStudioWidget::create_switch_to_next_editor_action()
@@ -908,6 +912,7 @@ void HackStudioWidget::create_action_tab(GUI::Widget& parent)
         m_diff_viewer->set_content(original_content, diff);
         set_edit_mode(EditMode::Diff);
     });
+    m_gml_preview_widget = m_action_tab_widget->add_tab<GMLPreviewWidget>("GML Preview", "");
 
     ToDoEntries::the().on_update = [this]() {
         m_todo_entries_widget->refresh();
@@ -1150,4 +1155,10 @@ bool HackStudioWidget::any_document_is_dirty() const
     return false;
 }
 
+void HackStudioWidget::update_gml_preview()
+{
+    auto gml_content = current_editor_wrapper().filename().ends_with(".gml") ? current_editor_wrapper().editor().text() : "";
+    m_gml_preview_widget->load_gml(gml_content);
+}
+
 }

Userland/DevTools/HackStudio/HackStudioWidget.h

@@ -13,6 +13,7 @@
 #include "Debugger/DisassemblyWidget.h"
 #include "EditorWrapper.h"
 #include "FindInFilesWidget.h"
+#include "GMLPreviewWidget.h"
 #include "Git/DiffViewer.h"
 #include "Git/GitWidget.h"
 #include "Locator.h"
@@ -119,6 +120,8 @@ private:
     void hide_action_tabs();
     bool any_document_is_dirty() const;
 
+    void update_gml_preview();
+
     NonnullRefPtrVector<EditorWrapper> m_all_editor_wrappers;
     RefPtr<EditorWrapper> m_current_editor_wrapper;
 
@@ -135,6 +138,7 @@ private:
     RefPtr<GUI::Splitter> m_editors_splitter;
     RefPtr<DiffViewer> m_diff_viewer;
     RefPtr<GitWidget> m_git_widget;
+    RefPtr<GMLPreviewWidget> m_gml_preview_widget;
     RefPtr<ClassViewWidget> m_class_view;
     RefPtr<GUI::Menu> m_project_tree_view_context_menu;
     RefPtr<GUI::Statusbar> m_statusbar;