HackStudio: Allow users to drag and drop files into the editor

Author: https://github.com/ry-sev 🔰
Commit: https://github.com/SerenityOS/serenity/commit/21ecd5b804b
Pull-request: https://github.com/SerenityOS/serenity/pull/6247
Reviewed-by: https://github.com/itamar8910 ✅

Userland/DevTools/HackStudio/Editor.cpp

@@ -40,6 +40,7 @@
 #include <LibGUI/GMLSyntaxHighlighter.h>
 #include <LibGUI/INISyntaxHighlighter.h>
 #include <LibGUI/Label.h>
+#include <LibGUI/MessageBox.h>
 #include <LibGUI/Painter.h>
 #include <LibGUI/ScrollBar.h>
 #include <LibGUI/Window.h>
@@ -302,6 +303,23 @@ void Editor::mousedown_event(GUI::MouseEvent& event)
     GUI::TextEditor::mousedown_event(event);
 }
 
+void Editor::drop_event(GUI::DropEvent& event)
+{
+    event.accept();
+    window()->move_to_front();
+
+    if (event.mime_data().has_urls()) {
+        auto urls = event.mime_data().urls();
+        if (urls.is_empty())
+            return;
+        if (urls.size() > 1) {
+            GUI::MessageBox::show(window(), "HackStudio can only open one file at a time!", "One at a time please!", GUI::MessageBox::Type::Error);
+            return;
+        }
+        open_file(urls.first().path());
+    }
+}
+
 void Editor::enter_event(Core::Event& event)
 {
     m_hovering_editor = true;

Userland/DevTools/HackStudio/Editor.h

@@ -80,6 +80,7 @@ private:
     virtual void paint_event(GUI::PaintEvent&) override;
     virtual void mousemove_event(GUI::MouseEvent&) override;
     virtual void mousedown_event(GUI::MouseEvent&) override;
+    virtual void drop_event(GUI::DropEvent&) override;
     virtual void enter_event(Core::Event&) override;
     virtual void leave_event(Core::Event&) override;