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LibWeb: Add support for handling drag-and-drop events of DOM elements

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This allows dragging elements on the page and dropping them onto other
elements. This does not yet support dragging text.

The test added here is manual; the WPT tests rely heavily on WebDriver
actions.
This commit is contained in:
Timothy Flynn
2026-04-04 18:20:12 -04:00
committed by Tim Flynn
parent b7076c366d
commit cfe7ddc805
Notes: github-actions[bot] 2026-04-05 15:35:41 +00:00 
Author: https://github.com/trflynn89
Commit: https://github.com/LadybirdBrowser/ladybird/commit/cfe7ddc8058
Pull-request: https://github.com/LadybirdBrowser/ladybird/pull/8783
6 changed files with 287 additions and 36 deletions
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2
Libraries/LibWeb/Page/DragAndDropEventHandler.h
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@@ -22,7 +22,7 @@ public:
bool has_ongoing_drag_and_drop_operation() const { return !m_drag_data_store.is_null(); }
EventResult handle_drag_start(JS::Realm&, CSSPixelPoint screen_position, CSSPixelPoint page_offset, CSSPixelPoint client_offset, CSSPixelPoint offset, unsigned button, unsigned buttons, unsigned modifiers, Vector<HTML::SelectedFile> files);
EventResult handle_drag_start(JS::Realm&, GC::Ptr<DOM::Node> drag_target, CSSPixelPoint screen_position, CSSPixelPoint page_offset, CSSPixelPoint client_offset, CSSPixelPoint offset, unsigned button, unsigned buttons, unsigned modifiers, Vector<HTML::SelectedFile> files);
EventResult handle_drag_move(JS::Realm&, GC::Ref<DOM::Node>, CSSPixelPoint screen_position, CSSPixelPoint page_offset, CSSPixelPoint client_offset, CSSPixelPoint offset, unsigned button, unsigned buttons, unsigned modifiers);
EventResult handle_drag_leave(JS::Realm&, CSSPixelPoint screen_position, CSSPixelPoint page_offset, CSSPixelPoint client_offset, CSSPixelPoint offset, unsigned button, unsigned buttons, unsigned modifiers);
EventResult handle_drop(JS::Realm&, CSSPixelPoint screen_position, CSSPixelPoint page_offset, CSSPixelPoint client_offset, CSSPixelPoint offset, unsigned button, unsigned buttons, unsigned modifiers);