HackStudio: Support multiple editors on screen

This patch adds Editor (subclass of GTextEditor) and EditorWrapper.
An EditorWrapper is a composite widget that adds a little statusbar
above an Editor widget. The statusbar is used for showing the filename
and the current cursor position. More things can definitely be added.

To get to the currently active editor, call current_editor().
You can also get to the current editor's wrapper by calling..
current_editor_wrapper(). Which editor is current is determined by
which was was last focused by the user.

1 files changed, 19 insertions, 0 deletions

diff --git a/DevTools/HackStudio/Editor.h b/DevTools/HackStudio/Editor.h
new file mode 100644
index 0000000000..349984eaab
--- /dev/null
+++ b/DevTools/HackStudio/Editor.h
@@ -0,0 +1,19 @@
+#pragma once
+
+#include <LibGUI/GTextEditor.h>
+
+class Editor final : public GTextEditor {
+    C_OBJECT(Editor)
+public:
+    virtual ~Editor() override {}
+
+    Function<void()> on_focus;
+
+private:
+    virtual void focusin_event(CEvent& event) override;
+
+    Editor(GWidget* parent)
+        : GTextEditor(GTextEditor::MultiLine, parent)
+    {
+    }
+};